Hey Chris. This engine design lives on and anyone can buy one. YS makes them for model airplanes. The engine has a sealed bottom end like a two stroke. It has a rotary valve, draws air/fuel/oil in the bottom end as the piston is on the up stroke, then the rotary valve switches to an outgoing port that feeds through the pipe up to the intake port of the head while the intake valve is open. It is essentially supercharged. Because the bottom end is sealed like a two stroke it requires oil/fuel mixture to lubricate the crank and rod bearings and piston and rings. I have a YS-63 engine and it is much more powerful than a comparable naturally aspirated 4-stroke engine. The YS has been around since at least the mid 90’s. Looking at the square opening at the bottom front of the case it appears that maybe the CCM engine was going to use a reed block instead of a rotary valve like the YS engines do. Also the transfer tube appears to have a mount like a carburetor…. I suppose that could work too but would require the reed valve after the carburetor. There are definitely parts missing and questions to be answered. I had no idea this was ever used in a motorcycle. So neat to get to see this. Thank you for bringing this piece of awesome history to TH-cam.
In the early 70s John Hamm from bill's cycle in north st. Paul MN built an tried promoting at the tract a side car on a BSA 500. I rode in the side car my self. I still have a 72 BSA 500
In 1974, working as a m/c mechanic at Jack Burns Yamaha NZ, I built an engine using this concept. It consisted of a 100cc Kawasaki rotary valve crankcase, a Suzuki reed valve, Honda 90cc barrel and OHC head, oil pump run off the camshaft for valve train lube and Honda cr/shaft sprocket fitted to Kawasaki cr/shaft to drive cam. The fuel/oil mix entered via the carb and rotary valve on the RH side by the cr/shaft, into the cr/case. From there into the intake manifold via a reed valve that was mounted on top of the cr/case. I mounted it in the Kawasaki frame and used to ride it around the paddocks. Power increase was minimal but it was a 90cc that performed like a 100cc. Problem was that in order to fit the reed valve I had to fabricate a housing out of panel filler [bog] and it developed leaks, however, I had proved my point so moved on.
Hi Roger Twiss as I mentioned in the video I don’t understand the mechanics and engineering of the five stroke idea although I think the entire project was really only started to raise much needed funds that were available from the British government for these kinds of innovative ideas and the CCM company was certainly struggling at that time financially but I don’t think even they expected it to go any further than just an experiment.
I really appreciate it , as I had an old Kawasaki 100 with the reed valve on the right side of the crank , I follow you all the way through what you said for the most part except for the where are you tie the cam chain in at … Beautiful idea ! Love it … I am a bit of a mechanic myself but not as far out as you are !!!!
@@robertholderman7552 The cam chain on the Honda 90 runs up the left side of the engine so it was pretty easy to just swap the lower sprocket from the Honda cr/shaft to the Kawasaki cr/shaft. NB From memory the Honda barrel fitted straight onto the Kawasaki cr/case. Oil pump had it's own tank. Thank you for your kind comments, merry Christmas
I have a Stihl 4s long reach chainsaw that works like this, it uses the crankcase to do the induction and then transferred to the head via the inlet valve ,it is lubricated by fuel mix but is a fourstroke.
@@shawnsatterlee6035 No it isn't, it is a four stroke with inlet and exhaust valves but charged by the crankcase, weird set up they call 4s. It uses two stroke mix for lubrication . The fuel goes into the the crankcase then up to the inlet under pressure for the cylinder, so therefore is a 5 stroke like the CCM.
Yea, I’m a mechanical engineer and have never heard of this before. I replayed that part of the clip where you give that little description. My gut tells me that it either didn’t run or it failed miserably at making power, even having good fuel economy for a normal engine and probably had huge reliability issues. The holy grail of internal combustion engines is to get one built that has a thermal efficiency of better than about 98% waste heat to work done…90% waste heat to 10% work would be miraculous! All that being said, to design and build a working IC engine that has some advantage whilst having bulletproof reliability is something that we saw briefly after the last turn of the century with the Formula 1 turbo diesels that dominated for about half a dozen years. Their enormous advantage was the power density of diesel fuel allowing for less pit stops and therefore they completely dominated. This 5 stroke concept appears to have been a million pound (accounting for currency inflation) puff of smoke! Maybe, if I could see diagrams from the patent application…
I only hear about thermal efficiency when us Waukesha mechanics get together with engineers. Would be nice to figure out a way to harvest all that wasted heat’
@Robert Walsh I remember reading an article back in the 90's about a two stroke motorcycle engine that Honda developed that retained most of the heat from the previous power stroke to fire the next, and did it with enough efficiency that it did not need the ignition system once running. They claimed that it ran so clean that it would be the first (at the time) two stroke that was capable of passing the new emission standards that killed them. Surely there is info out there on the web about it, although it was only produced in Japan and I haven't heard about it since.
When you read that short description about it using crankcase pressure to pressurize the intake, the light bulb turned on in my head. Using the bottom of the piston as the additional stroke, Brilliant!! However it hasn't taken the world by storm, has it.
I vaguely remember reading something about five Strokes back then. With everything happened to meet emissions standards now it would be nice to see this concept brought back but with electronic fuel injection instead. And although I rode bikes, my passion has has been air Plains. Been a pilot since the early 70's. It was in the early 80s I cut a Volkswagen Block in half to use in my ultralight. Nice to see the old Sidecar. Watching them race was a blast the sidecar Rider would climb all around in an effort to keep it balanced while cornering. 🤠🐂🏞️🛩️
Wow, it's been so long since I'd thought of CCM that the name didn't even parse when I clicked on the vid! I was just following up on the "5 stroke" thing...
Beautiful thumper. Those cooling fins are so deep they just beg to be snapped off by a spill or slip by a heavy handed mechanic, Allen Millyard is the go to man & could likely take this engine to the next level in his yard shed. His creations are just amazing. Being a small Honda C series platform fan myself, Allen Millyard took a Honda s90 and added another cylinder to it in effect making it a 180cc v- twin looking like a baby Honda-Ducati. with amazing performance. Triumph 200 mountain cub was my 1st & all time favorite moto for all around on and off road riding. Those earlier engines are pieces of art, the machining and aluminum work and simplicity of the bikes was and still is very appealing xompared to the plastic coated & water cooled & computer dependent bikes of today.
Always wanted a CCM but couldn't afford one at the time, very cool how Clews took up all those old BSA engines and reworked them into very competitive machines 😉
Hi Steve absolutely . . . I always thought Alan Clews never got the full recognition he deserved for what he did with the remains of the old BSA Competition dept, because when he first did the deal to buy the franchise he was then told he wouldn’t have any access to the BSA competition engines and so he took what was basically a standard road bike motor and retuned it for more power, but as you know he went on to build some iconic race bikes which are still highly sought after today.
@@monticlassictv Indeed Chris, I do recall a piece on BBC's" Nationwide" show that featured the CCM success and did show the bikes being lowered out the upper floor of the workshop on a rope. I do now own a BSA 441 Victor Special which is probably as close as I will get 😉
This idea worked better on a triumph as both pistons travelling together gave a double pressure to the one firing cylinder. Worked well except it sucked all the oil out of the sump. The faster it went the more it smoked. Percy tait tested it
Great video ! I love motorcycles.. I honestly think you should be doing talking books when you have time. Your voice captivated me along with the information you shared..... Thank you.. I lived most of my life in Canada where a lot of old motorcycles still survives because of a short warm season.
Another really interesting video. I can still remember meeting Alan Clews and Fluff Brown at the dirt bike shows in the late 70's when er still called what we did scrambling. I rode both a CCM 580 and an ex works FB AJS 360 both of which I will always regret selling although I did swap the CCM for the AJS as I was too small to handle the CCM. My eye were bigger than my ability I guess 😁
Hi again Sophie Yes this five stroke motor was a decent concept although personally I think it was more to do with bringing in valuable funds to the CCM bank balance as they were struggling a bit financially by the the time they engineered this new motor. But thanks again for your comments and for watching more of my content.
@@monticlassictv I think the way to go might have been to try to produce an ohc engine based on the B50. I have seen motors like the Rocket 3/T160 triple converted but money was none existent as regarded the British motorcycle industry back then. I remember my Bonneville T140E and the way the paint just fell off the frame due to skimping on prep. Thank you Chris for taking the time to entertain us with your fab vids 👍🙂
👍 Definitely cool. Speaking of the Wayback machines, I'm only on my phone right now but it sure looks like you're leaning on a old Honda Odyssey? 🤠🐂🏞️🛩️
I used to work at Road and Racing Motorcycles in Hyde Cheshire and CCM aproached us to build a road racing chassis for their five stroke engine, this we did and the machine was taken to Oulton Park for testing. It was extreemly quik for a single but I don't know what happend to it after that,
The "five stroke" concept was also done in America around the same era. It's not really five strokes as the crank still only completed two revolutions to complete the cycle. The crankcase pressure on the power stroke (underside of piston, 2nd use of power stroke and considered the 5th stroke) is used to effectively supercharge the following intake stroke. On the American system, the crankcase was the same as a two stroke, with premixed fuel used for lubrication and reed valves to control induction and exhaust (of the crankcase).
......it's a great idea., but in a way give you the disadvantage of 2 stroke & the cost of 4 stroke +...........but if you are out in front of the pack., that madness had value..
@@robertwoodliff2536 IDK if you know about single cylinder engine's ACR system. A centrifugally retractable pin on the exhaust cam lobe allow for the exhaust valve to be cracked open for most of the early part of the compression stroke reducing cranking effort. But the Stihl BR600 and BR700 backpack blowers only have one cam lobe and via rocker arms it operates both valves. While grasping at straws trying to troubleshoot the running of one I noticed that the intake valve was being cracked during the later portion of the power stroke. Concerned that it may be a malfunction due to wear I talked my boss into letting me completely disassemble a new never-run $1000 backpack blower to find out. I've been repairing air cooled engines since the 1950s and Stihl had indeed cleverly created the ultimate easy-spin starting system. On the compression stroke mixture is "wasted" by bleeding it off out the exhaust port for about 80% of the compression stroke. And once over TDC what would normally require effort to fight "suction" on the power stroke is cancelled by cracking the intake valve and making it actually into a second intake stroke. If you take one apart you will see how this is done via the single cam lobe. I'm American with my roots in American aviation, motorcycle and small engines. I hate to give Andreas Stihl AG any credit. But those little blower engines are very very easy to crank, start and idle very reliably, and the power to weight ratio puts all other naturally aspirated four cycle engines to shame.
THE FIVE STROKE ENGINE WAS DESIGNED AND PATENTED BY THE TOP MECHANIC ANT SCHAMMEL TRUCKS IN WATFORD BY THE GREAT MAN FROM WATFORD NAME: WILLIAM WILTSHIRE
LOL! what a funny way of recycling the crankcase pressure to boost intake volume. Like a weak super charger with lube added in. Never knew Clews was this ecentric and I have ridden owned BSA 40 years
I don’t think Allan Clews was actually serious about making it work but as far as I know the company was a bit strapped for cash at this time and the British government were handing out grants to British companies who were trying to develop new and interesting technologies so naturally Allan started on this project to steady his ship and applied for the grant.
The problem I see is oil consumption. Breathing the crankcase pressure in such away as to charge the intake would be the cause of oil going thru the intake.
Soooooo....the engine would use positive crankcase pressure to increase intake manifold pressure? Sounds like trying to use the engine's existing energy vs other means of forced induction. I suppose it "could" work if you were able to overcome the lubrication and oil consumption issues.
met a lad that had done something similar with a speedway jawa motor with modern fuel injection the gains were only minimal i beleve the bike is alive in sweden iirc
Hi Clayton well done to you I understand the concept but I’m not an engineer so the mechanics are a bit over my head, but thanks for your comments and for taking the time to watch my content.
@@monticlassictv : SIR you don’t need to be AN ENGINEER TO understand this you just need to read enough time to get things in your brain and you can start to figure it out yourself … Seriously that’s how I obtain the stuff .. also read a lot of Mx books years gone by now .. and take apart at least five two-stroke engines and at least 5 ..4 stroke engines .. and you will be able to grasp a lot of the theory !!!!! Oh and reassemble a few and make them run !!!! LoL
I made CCM’s for five years and they wouldn’t have had the Suzuki engine without me and Dale from Australia after the Rotax being no more i help set up the meeting at the NEC with Alans son Austin and Suzuki. Want any help give us a shout
A reed for the transfare in the cylinder? how far down the cylinder is the port because thats where the compression starts.oil in fuel too.two stroke powers twice as many times but power is less because of exhaust port.i don't think reeds where around at the build time.
Well I never knew that ! Lost everything I knew from my worse brain injury and info doesn't stay in my head much nowadays 😕 I can't absorb information well just can do stuff that's stuck, weird things brain injury, don't get one !
Love your accent-are you Scottish? The only uncle I ever had was a hired hand on my grandparents tobacco farm in Canada and he was the coolest uncle you could ever have. John in Texas
It's not unique and it's not a 5 stroke but a crankcase supercharged 4 stroke. In the 80's a German rider built a similar engine on a 2 stroke crankcase and campaigned it successfully in enduros.
![ILLSLICK - KILLSHOT REMIX [FULL VERSION]](http://i.ytimg.com/vi/RIK8RrqIAzE/mqdefault.jpg)
Good morning sir. Chris Montignani, interesting review, congratulations.
Hey Chris. This engine design lives on and anyone can buy one. YS makes them for model airplanes. The engine has a sealed bottom end like a two stroke. It has a rotary valve, draws air/fuel/oil in the bottom end as the piston is on the up stroke, then the rotary valve switches to an outgoing port that feeds through the pipe up to the intake port of the head while the intake valve is open. It is essentially supercharged. Because the bottom end is sealed like a two stroke it requires oil/fuel mixture to lubricate the crank and rod bearings and piston and rings. I have a YS-63 engine and it is much more powerful than a comparable naturally aspirated 4-stroke engine. The YS has been around since at least the mid 90’s. Looking at the square opening at the bottom front of the case it appears that maybe the CCM engine was going to use a reed block instead of a rotary valve like the YS engines do. Also the transfer tube appears to have a mount like a carburetor…. I suppose that could work too but would require the reed valve after the carburetor. There are definitely parts missing and questions to be answered. I had no idea this was ever used in a motorcycle. So neat to get to see this. Thank you for bringing this piece of awesome history to TH-cam.
Heh, didn't see this, posted something similar. The YS engines are quite special.
As a kid I dreamt of having a CCM one day.
In the early 70s John Hamm from bill's cycle in north st. Paul MN built an tried promoting at the tract a side car on a BSA 500. I rode in the side car my self. I still have a 72 BSA 500
In 75 met the fellow who designed the engine at Alan's Bolton shop. Good presenter - end of story.
Love old dirt bikes.
Got pictures of them all over my garage. Get to look at them and it's much cheaper than owning them.😅
WoW. I never knew there was a thing as a 5 stroke. Very interesting Chris. Cheers
I remember them running in our local scrambles, a loud thump of course, but they could be right buggers to kick over
Classic and my first kx80 1988 barn find. Shocks blown but I made all else rip, straight factory also. Crazy power for something so old
In 1974, working as a m/c mechanic at Jack Burns Yamaha NZ, I built an engine using this concept. It consisted of a 100cc Kawasaki rotary valve crankcase, a Suzuki reed valve, Honda 90cc barrel and OHC head, oil pump run off the camshaft for valve train lube and Honda cr/shaft sprocket fitted to Kawasaki cr/shaft to drive cam. The fuel/oil mix entered via the carb and rotary valve on the RH side by the cr/shaft, into the cr/case. From there into the intake manifold via a reed valve that was mounted on top of the cr/case. I mounted it in the Kawasaki frame and used to ride it around the paddocks. Power increase was minimal but it was a 90cc that performed like a 100cc. Problem was that in order to fit the reed valve I had to fabricate a housing out of panel filler [bog] and it developed leaks, however, I had proved my point so moved on.
Hi Roger Twiss as I mentioned in the video I don’t understand the mechanics and engineering of the five stroke idea although I think the entire project was really only started to raise much needed funds that were available from the British government for these kinds of innovative ideas and the CCM company was certainly struggling at that time financially but I don’t think even they expected it to go any further than just an experiment.
I really appreciate it , as I had an old Kawasaki 100 with the reed valve on the right side of the crank , I follow you all the way through what you said for the most part except for the where are you tie the cam chain in at … Beautiful idea ! Love it … I am a bit of a mechanic myself but not as far out as you are !!!!
@@robertholderman7552 The cam chain on the Honda 90 runs up the left side of the engine so it was pretty easy to just swap the lower sprocket from the Honda cr/shaft to the Kawasaki cr/shaft. NB From memory the Honda barrel fitted straight onto the Kawasaki cr/case. Oil pump had it's own tank. Thank you for your kind comments, merry Christmas
That classic intro was firing! 🏴
Had a '71 B50M years ago. She was a stump puller!
I have a Stihl 4s long reach chainsaw that works like this, it uses the crankcase to do the induction and then transferred to the head via the inlet valve ,it is lubricated by fuel mix but is a fourstroke.
So it's a case reed induction? Yeah that's just a 2stroke..
@@shawnsatterlee6035 No it isn't, it is a four stroke with inlet and exhaust valves but charged by the crankcase, weird set up they call 4s. It uses two stroke mix for lubrication . The fuel goes into the the crankcase then up to the inlet under pressure for the cylinder, so therefore is a 5 stroke like the CCM.
Yea, I’m a mechanical engineer and have never heard of this before. I replayed that part of the clip where you give that little description. My gut tells me that it either didn’t run or it failed miserably at making power, even having good fuel economy for a normal engine and probably had huge reliability issues.
The holy grail of internal combustion engines is to get one built that has a thermal efficiency of better than about 98% waste heat to work done…90% waste heat to 10% work would be miraculous!
All that being said, to design and build a working IC engine that has some advantage whilst having bulletproof reliability is something that we saw briefly after the last turn of the century with the Formula 1 turbo diesels that dominated for about half a dozen years.
Their enormous advantage was the power density of diesel fuel allowing for less pit stops and therefore they completely dominated.
This 5 stroke concept appears to have been a million pound (accounting for currency inflation) puff of smoke!
Maybe, if I could see diagrams from the patent application…
I only hear about thermal efficiency when us Waukesha mechanics get together with engineers.
Would be nice to figure out a way to harvest all that wasted heat’
@Robert Walsh I remember reading an article back in the 90's about a two stroke motorcycle engine that Honda developed that retained most of the heat from the previous power stroke to fire the next, and did it with enough efficiency that it did not need the ignition system once running. They claimed that it ran so clean that it would be the first (at the time) two stroke that was capable of passing the new emission standards that killed them. Surely there is info out there on the web about it, although it was only produced in Japan and I haven't heard about it since.
Good to see you back
All the best , can’t wait to see those big ccm Rotax’s !
Very enjoyable video! Robin (from Down Under) fitted a 2 stroke to the top of a larger 4 stroke, upside down, to use as calving and supercharging.
When you read that short description about it using crankcase pressure to pressurize the intake, the light bulb turned on in my head. Using the bottom of the piston as the additional stroke, Brilliant!! However it hasn't taken the world by storm, has it.
Emissions, it still burns the oil and smokes a lot.
I vaguely remember reading something about five Strokes back then. With everything happened to meet emissions standards now it would be nice to see this concept brought back but with electronic fuel injection instead. And although I rode bikes, my passion has has been air Plains. Been a pilot since the early 70's. It was in the early 80s I cut a Volkswagen Block in half to use in my ultralight.
Nice to see the old Sidecar. Watching them race was a blast the sidecar Rider would climb all around in an effort to keep it balanced while cornering.
🤠🐂🏞️🛩️
Wow, it's been so long since I'd thought of CCM that the name didn't even parse when I clicked on the vid! I was just following up on the "5 stroke" thing...
Beautiful thumper. Those cooling fins are so deep they just beg to be snapped off by a spill or slip by a heavy handed mechanic, Allen Millyard is the go to man & could likely take this engine to the next level in his yard shed. His creations are just amazing. Being a small Honda C series platform fan myself, Allen Millyard took a Honda s90 and added another cylinder to it in effect making it a 180cc v- twin looking like a baby Honda-Ducati. with amazing performance. Triumph 200 mountain cub was my 1st & all time favorite moto for all around on and off road riding. Those earlier engines are pieces of art, the machining and aluminum work and simplicity of the bikes was and still is very appealing xompared to the plastic coated & water cooled & computer dependent bikes of today.
Well put!
Always wanted a CCM but couldn't afford one at the time, very cool how Clews took up all those old BSA engines and reworked them into very competitive machines 😉
Hi Steve absolutely . . . I always thought Alan Clews never got the full recognition he deserved for what he did with the remains of the old BSA Competition dept, because when he first did the deal to buy the franchise he was then told he wouldn’t have any access to the BSA competition engines and so he took what was basically a standard road bike motor and retuned it for more power, but as you know he went on to build some iconic race bikes which are still highly sought after today.
@@monticlassictv Indeed Chris, I do recall a piece on BBC's" Nationwide" show that featured the CCM success and did show the bikes being lowered out the upper floor of the workshop on a rope. I do now own a BSA 441 Victor Special which is probably as close as I will get 😉
Me too. I cut up a C15 engine to look like the CCM. I did have a 490 Maico for 8 years my friends were afraid of it. Sold it to buy an Opel Manta GTE
This idea worked better on a triumph as both pistons travelling together gave a double pressure to the one firing cylinder. Worked well except it sucked all the oil out of the sump. The faster it went the more it smoked. Percy tait tested it
Great video ! I love motorcycles.. I honestly think you should be doing talking books when you have time. Your voice captivated me along with the information you shared..... Thank you.. I lived most of my life in Canada where a lot of old motorcycles still survives because of a short warm season.
Another really interesting video. I can still remember meeting Alan Clews and Fluff Brown at the dirt bike shows in the late 70's when er still called what we did scrambling. I rode both a CCM 580 and an ex works FB AJS 360 both of which I will always regret selling although I did swap the CCM for the AJS as I was too small to handle the CCM. My eye were bigger than my ability I guess 😁
Hi again Sophie Yes this five stroke motor was a decent concept although personally I think it was more to do with bringing in valuable funds to the CCM bank balance as they were struggling a bit financially by the the time they engineered this new motor. But thanks again for your comments and for watching more of my content.
@@monticlassictv I think the way to go might have been to try to produce an ohc engine based on the B50. I have seen motors like the Rocket 3/T160 triple converted but money was none existent as regarded the British motorcycle industry back then. I remember my Bonneville T140E and the way the paint just fell off the frame due to skimping on prep.
Thank you Chris for taking the time to entertain us with your fab vids 👍🙂
Very interesting
Thank you for taking the time to post
Old Greeves rider here. Would enjoy seeing a program on the old two-strokes like Greeves and Cotton.
Harry Millers used them five stroke at indianapolis. Mazda had a miller cycle car they used a supercharger to help the induction cylcle.
They did get it running in a bike, I rode it at the factory. It had a very smooth power band compared to the standard engine.
I think that would have been early 1981 we were working on the Armstrong 250 road race project with Mike Eatough at the time
More people have been on the moon than ridden that bike.
Respect..!
👍 Definitely cool.
Speaking of the Wayback machines, I'm only on my phone right now but it sure looks like you're leaning on a old Honda Odyssey?
🤠🐂🏞️🛩️
I used to work at Road and Racing Motorcycles in Hyde Cheshire and CCM aproached us to build a road racing chassis for their five stroke engine,
this we did and the machine was taken to Oulton Park for testing. It was extreemly quik for a single but I don't know what happend to it after that,
hi Chris, ive got a rare CCM, a 1998 CCM paris dakar bike, one of four built for team ireland to compete in the 20th Dakar rally,
The "five stroke" concept was also done in America around the same era. It's not really five strokes as the crank still only completed two revolutions to complete the cycle. The crankcase pressure on the power stroke (underside of piston, 2nd use of power stroke and considered the 5th stroke) is used to effectively supercharge the following intake stroke. On the American system, the crankcase was the same as a two stroke, with premixed fuel used for lubrication and reed valves to control induction and exhaust (of the crankcase).
Later on, a model airplane four stroke was made with this same principle, done in several sizes. It was a cut above other four strokes in power.
......it's a great idea., but in a way give you the disadvantage of 2 stroke & the cost of 4 stroke +...........but if you are out in front of the pack., that madness had value..
Stihl 4-cycle trimers and blowers do the same.
@@patrickshaw8595......Mmmmm........than.,i'll have a look..
@@robertwoodliff2536 IDK if you know about single cylinder engine's ACR system. A centrifugally retractable pin on the exhaust cam lobe allow for the exhaust valve to be cracked open for most of the early part of the compression stroke reducing cranking effort. But the Stihl BR600 and BR700 backpack blowers only have one cam lobe and via rocker arms it operates both valves. While grasping at straws trying to troubleshoot the running of one I noticed that the intake valve was being cracked during the later portion of the power stroke.
Concerned that it may be a malfunction due to wear I talked my boss into letting me completely disassemble a new never-run $1000 backpack blower to find out.
I've been repairing air cooled engines since the 1950s and Stihl had indeed cleverly created the ultimate easy-spin starting system. On the compression stroke mixture is "wasted" by bleeding it off out the exhaust port for about 80% of the compression stroke. And once over TDC what would normally require effort to fight "suction" on the power stroke is cancelled by cracking the intake valve and making it actually into a second intake stroke.
If you take one apart you will see how this is done via the single cam lobe.
I'm American with my roots in American aviation, motorcycle and small engines.
I hate to give Andreas Stihl AG any credit. But those little blower engines are very very easy to crank, start and idle very reliably, and the power to weight ratio puts all other naturally aspirated four cycle engines to shame.
show 5 strokes ?
25% more HP.The sump is a Supercharger .Only the Reed valve blocks & carbie are missing.
Great video Chris👍
Nicely presented 👍 , the do be careful got me though ha ha brake a leg have fun
I used to race a sidecar outfit in the 70's. My Mum would always say, "You will go careful won't you" yes Mum!!
THE FIVE STROKE ENGINE WAS DESIGNED AND PATENTED BY THE TOP MECHANIC ANT SCHAMMEL TRUCKS IN WATFORD BY THE GREAT MAN FROM WATFORD NAME: WILLIAM WILTSHIRE
LOL! what a funny way of recycling the crankcase pressure to boost intake volume. Like a weak super charger with lube added in. Never knew Clews was this ecentric and I have ridden owned BSA 40 years
I don’t think Allan Clews was actually serious about making it work but as far as I know the company was a bit strapped for cash at this time and the British government were handing out grants to British companies who were trying to develop new and interesting technologies so naturally Allan started on this project to steady his ship and applied for the grant.
the sidecar chassis appears to be a modified Yamaha TT/XT 500 frame
These motors have been developed a lot since their beginnings when they powered the Triumph T15 "Terrier".
When did the triumph terrier use a 5 stroke engine?
The problem I see is oil consumption. Breathing the crankcase pressure in such away as to charge the intake would be the cause of oil going thru the intake.
Soooooo....the engine would use positive crankcase pressure to increase intake manifold pressure? Sounds like trying to use the engine's existing energy vs other means of forced induction. I suppose it "could" work if you were able to overcome the lubrication and oil consumption issues.
met a lad that had done something similar with a speedway jawa motor
with modern fuel injection
the gains were only minimal
i beleve the bike is alive in sweden iirc
Awesome Chris! Thanks!
What a unbelievable story where are the cup holders on the side car, that side car is loaded with patina that front fork is unusual.🧐
Easy as I worked it out just looking at it .Looks like they probably would have run a reed valve on the inlet .
Hi Clayton well done to you I understand the concept but I’m not an engineer so the mechanics are a bit over my head, but thanks for your comments and for taking the time to watch my content.
@@monticlassictv : SIR you don’t need to be AN ENGINEER TO understand this you just need to read enough time to get things in your brain and you can start to figure it out yourself … Seriously that’s how I obtain the stuff .. also read a lot of Mx books years gone by now .. and take apart at least five two-stroke engines and at least 5 ..4 stroke engines .. and you will be able to grasp a lot of the theory !!!!! Oh and reassemble a few and make them run !!!! LoL
I made CCM’s for five years and they wouldn’t have had the Suzuki engine without me and Dale from Australia after the Rotax being no more i help set up the meeting at the NEC with Alans son Austin and Suzuki. Want any help give us a shout
Stihls' 4-Mix motors work the same way, using 2 stroke fuel to lubricate everythingand valves to get 4 stroke torque
A reed for the transfare in the cylinder? how far down the cylinder is the port because thats where the compression starts.oil in fuel too.two stroke powers twice as many times but power is less because of exhaust port.i don't think reeds where around at the build time.
Well I never knew that ! Lost everything I knew from my worse brain injury and info doesn't stay in my head much nowadays 😕 I can't absorb information well just can do stuff that's stuck, weird things brain injury, don't get one !
Love your accent-are you Scottish? The only uncle I ever had was a hired hand on my grandparents tobacco farm in Canada and he was the coolest uncle you could ever have. John in Texas
Great stuff 👍
Nice
Was not this type engine used in the 1906 Compound automobile?
It uses crank case pressure to make filling the combustion chamber more efficient and fill with more combustible mixture, very cleaver.
So it's a case induction system like a two stroke.
@Whoop!
DON'T FORGET AJS.
Why did this technic not survive?
Using windage like a turbo?
Great vid! You Just earned a Sub from Me Chris..
It's not unique and it's not a 5 stroke but a crankcase supercharged 4 stroke. In the 80's a German rider built a similar engine on a 2 stroke crankcase and campaigned it successfully in enduros.
Super charged but can't get more out than in.. ? Maybe
They look like ATK's
Five what?
This would have been a more efficient engine.
iknow its development thing but its as rough as nails
Grab for Government funds ? Geez I'm a cynic.