Crighton CR700W : What makes this bike so special?
ฝัง
- เผยแพร่เมื่อ 26 มิ.ย. 2024
- Craig Scarborough takes a visit to Dorset to meet Brian Crighton, the mastermind engineer behind the CR700W - a new superbike powered by a unique Rotary engine
00:00 Intro
00:45 Arrangement
01:30 Brian's Vision
02:12 Weight distribution and suspension
02:46 Exhaust and air-cooling
04:38 Engine overview
06:11 Inside the Engine (How a Rotary Engine Works)
08:23 Transmission
09:14 Outtro
#Crighton #CR700W #rotary #motorcycle #motorbike #engineering #stem #bike #engine #ScarbsTech - วิทยาศาสตร์และเทคโนโลยี
The world needs more of these bikes ❤
The world needs more Brummie metal bashers!
Just needs more custom bikes."what bike you got"....
Custom honda.
A rotary won the bsb championship in 1994 , they later banned it because it was faster than than the rest of the grid!
A bike that was engineered by Brian Crighton and the spiritual ancestor of this machine
Imagine if it wasn’t banned, the development of the rotary engine for motorbikes would increase and prices of the bikes would reduce
@@richardchen1267We probably could be owning rotary road bikes by now if it wasn’t banned 🥲
@@richardchen1267 you do realise how much fuel and oil it consumes? could never make it into street use because it couldnt meet emission requirements and the range would be awful, its nothing other then a nieche product, thats why he only sells a handfull of those.
@@iNFiN3 wasn’t really talking about only him developing it.
I love this bike! Amazing craftmanship.
Such a wonderful sounding bike... Love them.
The specs are insane, just as the sound is! Love it! ❤
Seeing and hearing riders such as Steve Spray, Robert Dunlop, Ron Haslam cane the Norton Rotarys around the TT course was imprinted on my mind for ever, 22 years of looking later I get my own Rotary! OK its no where near the highly refined machines from the genius Mr Crighton but for a fact it gave birth to the 588 Nortons. I got myself a Hercules W2000, paint and chrome was shot but it was all there and 1,400 genuine miles with a pristine rotor housing it was brought back to A1 condition without the need for rare engine parts. What does it go like? A Bantam on steroids! Pop bang wirrr bloody hilarious to ride, rubbish hunting on the overrun but I love it. DKW who sold under the Hercules name in USA committed to selling 2000 in 2 years, fell short of the target so sold the rights and production equipment to Norton. My single rotor 294 is half a Norton. Mr Crighton could you tweak my Herc please 27HP not enough!
May you enjoy many more miles on your Hercules, however much power it makes!
Fantastic insights! Brilliant video guys. Looking forward so seeing more. Subscribed!
More to come!
Great video and commentary. Finally someone who actually showed what we wanted to see,,, the guts of the engine😊. 👍
Glad that you enjoyed it. We're hoping to do the same for other racing machines soon.
Now all we need is a singel rotary dirt bike. Now that would be something AMAZING.
Wish them the best❤❤
crighton solved the inherant rotary heating problem by feeding coolant through the e-shaft, keeping the center of the engine cool.
Reduicing weight in the process.
But as far as I understand, the cooling problem is at the outer wall plate near the sparkplugs, the sandwich plates at that location, and the rotor tips. Is that not so?
@@blipman17 yes it can be, but its exascerbated by the rotors expanding outward "pinching" the apex seals tighter and tighter
The exhaust ejector cooling system,as it is known. Super simple but very effective innovation.
Superb design ideas
It really is very clever. My favourite detail is the chassis doubling as the oil tank!
brilliant engine!
I've always loved rotary engines, motorcycle rotary, automotive rotary, Suzuki RE-5 was one I'm familiar with we sold them at the Suzuki Shop I worked at in the 76,77,78,79. I turbocharged many Mazda RX-7'S, those engines rev higher and thrive on turbo's & nitrous oxide,light, compact,lots of power too. That bike of yours is really something
If only it *was* ours!
Interesting bike, and good video!
Glad you enjoyed it
Fantastic video. I can't believe I'm one of the first 500 subscribers to this channel.
Great to have you on board!
Smooth running as they come too.
Until it shits out an apex seal
Fucking awesome. I want one.
Wish thay would make a modern 750 2 stroke bike or bigger 😂 i love anything 2 stroke or rotery
100% with you on that comment.
Somewhere saw a video of 2 kx 500 cylinders on a motorcycle
Have there been any rotary two-stroke bikes?
@@bradwilliams5242 yep iv seen a twin cr500 motor
@@Fee.1 not sure the f1 was great tho
That's shear genius! 💯
If I remember correctly, one of the issues with rotary engines - I'm thinking of the Mazdas, was the seals at the ends of the rotors would wear and fail which was a weakness that I don't has ever been resolved. I had an RX-2 and it was pretty powerful for a small lump, and when it got to a certain RPM it was like a VTEC engine, suddenly there'd be just gobs of power and it would take off like a scalded cat.
If maintained properly those seals will actually last a pretty decent amount of mileage, the key is keeping a good tune and maintaining good oil at all times.
Mazda managed to resolve the issues with the apex seals and so long as they were properly maintained, the seals would last more than 100k mls. What killed the rotary engine was not the seal issue although. many people thought it was an endemic problem, but the pollution as they couldn't get it clean enough for modern legislation. Another point was that they were thirst although Mazda eventually got acceptable fuel consumption out of them. The RX7 which was discontinued in 2002 is a modern classic and a big farorite with the retro horse power brigade. I hear that no normal garage will touch an RX7 because of the fears with the rotary engine so its left to the specialists
Yeah, seals and emissions issues.
But for a RACE BIKE...as we've seen, "they'll" rule it out because they can't beat it.
so you had a rotary powered car but you don't know what apex seals are? curious
@@StanleyKubick1You expect too much from the average car owner. I wonder how many car owners actually know how a petrol engine works, let alone a Wankel rotary. Most owners are dumb as to the workings of their vehicle, which is the excuse why the manufacturers and legislators have ladled our car with gimmicks.
same size motor as a rd350 - work of art! I want one
I need this to get to work, early.
I think it’s mega, I would love to ride one 👍
Rotaries make the most glorious sounds.
Guy Martins test ride on one of these was awesome.
that bike is crazy.
... but in a good way?
Okay...I'm sold! When will the road street legal version be available!!!!
I had a Norton interpol 2, seized the engine and spent £1200 having the engine rebuilt in Shenstone by Richard Negus. Worth every penny.
Could've bought a honda for that....
@@ianvcurtisfineartsculptor.3709 Maybe. They both have an interest in old relics.
Spondon Rotory, Yess please
Fascinated By rotarys. Understand that once running, they will continue to run, even after losing coolant & lubricant. Seems a natural for light single engine aircraft.
The greatest bike ever !
I wish they sold this engine by its self.
Stock standard PP !!!!
This machine is a masterpiece. A Wankel freak myself. Same class as that 575 2T built in Switzerland. Just can't get on the guys name. Builds schassis for moto 2.
I think the end sce e w the bike stumbling and amoking oretty well sums up rotarys.
More beautiful than anything from the big boys
Cant wait for a triple rotor turbo 🤘
The twin rotor has the firing of a Six cylinder two stroke in a smaller package for the power output, incredible for Torque and power … I’d love one …. Gotta be smoother than my 1981 GSX1100 …
Hi mate. A 2 rotor is the same as a 4 cyclinder 4 stroke - 2 firing cycles per output shaft revolution. The thing is the eccentric shaft spins 3 times per rotor revolution so each rotor has one firing cycle per revolution of the eccentric shaft
I so wish I could afford that bike..
Steve spray and Trevor nation brilliant watching them on the JPS nortons
Please put one of these engines in a super kart 🤠 Would be nuts having 20-30 karts racing on a full size circuit with 200hp at the wheels 🤙
Utter madness… can we watch?
interesting i think the big brands are watching because in 2027 in Motogp the engines will be with less CC
I'd love to see sponsership for one of the top 10 IOM TT 2023 competitors put this beautiful bike through it's paces at TT 2024 🙏😎🏍️❤️
Wouldn't that be something?!
i believe guy martin has tested someones rotary saw a video a few months ago@@TheRaceBay
That would be this one.
I’ve had a Mazda rotary rx8 and it lacked hugely in torque, was a gas guzzler and even with top quality oil regular wore out fast. Think it’s great that people keep trying but the blue smoke when he revved it I wonder if it would ever comply to latest emissions.
it's a track only bike.
@@MrKdr500 The environment doesn't care where it runs. The exhaust doesn't stay within the fences.
And I don't care about the environment ❤
@@daveseemerollin6357 If that is not the most asinine comment ever made by anyone anywhere.
@TonyK3130 most track bikes don't have emissions regulations to abide by, they arent registered for road use and often remove emissions equipment to cut weight and increase performance.
Wouldnt that be a nice ad: CR700W, ‘its f-ing fast!’ 😂😂😂
the exhaust sucking air through the engine to cool it is something you will eventually see used on other bikes, maybe not rotary but air-cooled 4T engines need all the help they can get, air-cooled 4T engines are simple and easily maintained but tend to run hot so extra cooling with no moving parts is an obvious progression, it could pull hot air from the barrels & head with a shroud or casing and reworking of the fins, I'm thinking Suzuki ram-air system used on the 1970s 2T GT's hooked up to an exhaust system like this bike has !
anyone up for the challenge, get in the shed,
The air-cooling system is very clever!
It's a failed design that has never been successfully demonstrated
Is there a aftermarket transmission of that type available for bikes?
Possibly - this transmission was made by Nova who can be found at novaracing.co.uk
If there's enough interest we may do some videos just focusing on gearboxes and other components of cars and bikes, as well as complete vehicles
Would love to learn more about this ..any work going ???
We have a few other videos and shorts on this channel about the bike. For everything else I suggest you try giloindustries.com
did crigthon sale the engine individually or full bike?
Crighton sell the complete bike, but the engine itself is made by sister company Rotron. Unknown if the latter will sell you the engine by itself. rotronpower.com
I can't find it back but I saw a video about rotery whereby they turned the working" inside" out wich solved most problems a rotery is know for like the seals ect. When I saw it I was like amazed how simple the solution was just turn the workings around. Mazda chefs must have had a burn the day they see that video.
So the rotor becomes a stator and the housing spins???
@@TheRaceBay no the rotor still spins haha. But the seals are in the housing not in the rotor, and the intake and exhaust ports are in the rotor.
Wankel engines are obsolete technology and no long r mass produced in any legitimate applications
I would most likely buy one if it cost like a BMW S1krr or a Ducati V4 around 20k Euros! But not 120k Euros.....
Apples to oranges
💯 % 🇬🇧 👌👍
I want 1 ,I reckon it's got potential too kik arse.
If some body wants a track bike that is lightweight, plenty of horsepower and only for the track, then perhaps the Suter MMX 500 could be a better option. That will at least finish a few laps at any track before needing to stop for fuel. Having a rotary bike will mean you get 15 mins of track action before needing to come in to refuel. Great conceptually, but will be terrible to live with.
I wished the host would ask questions that will add value rather than prompting the Crighton representative to say things on the pamphlet
How do you know that you can only get 15min of track time? The Rotary Norton NRV588 with a similar rotary engine won the British Superbike Championship, so it can’t be that bad.💁🏼♂️
@@streddaz
And the Isle of Man in 91 or 92.
@@kasperkjrsgaard1447 yes, you are correct!
The rotary isn’t so good on the street, as fuel consumption at lower RPMs is poor, but at higher RPM, it’s actually quite efficient. One of the reasons the Mazda 787B won LeMans was that they need less fuel stops than the opposition.
What a great car that was. Would you be interested in an in-depth tech review of older cars and bikes too? We're only just getting started with this channel and suggestions are welcome
@@streddazyes very true, a fantastic engine for racing thats where the rotary engine really shines
What makes it special is Guy Martin rode it and loves it!
Will go on sale?
No, Creighton is a notorious vaporware investment scam
Totaries have slways shown promise.They had a problem with the rotor rings which wore away qiickly and the pettol consumption. Both curable.
Wankel engines are inherently inferior and a colossal failure, they reached the logical conclusion of their development potential decades ago.
The world thinks were advanced and that consumers can buy the best cutting edge tech/machinery/vehicles. But we have what we have because of regulations, not because its the best.
Rotarys and 2 strokes are 2 engine configurations that are far superior for performance applications but have been written off by major manufacturers.
Cant wait for the 600 bhp turbo version.
What is the wear on the rotor lobes like .
APEXseal
Very nicely made! But why does it smoke like a 2-stroke?
Because it uses a little oil in the combustion chamber like a 2 stroke does. It only produces visible smoke when the engine is cold...once up to working temp there is no visible exhaust smoke.
Does it mix the oil in with the fuel? (like a 2 stroke) Or does the oil leak into the combustion chamber?
I notice the Parajet posters on the wall. When is this man going to design a rotary Powered Paraglider engine?
Parajet, Rotron and Crighton are all part of the same group of companies. Have a watch of this: Crighton CR700W Backstory: Brian Crighton & Gilo Cardozo interviews
th-cam.com/video/WsWG7KNET_Y/w-d-xo.html
What race class would you put a 2.1L bike in...??
How did you get to that figure?
Valid question, though. I wonder if there's a Formula Libre for bikes?
@@TheRaceBay Every revolution of the rotor the motor sucks in and burns 2.1L of air and fuel but produces no more power than an RSV of half that capacity...There are no race classes for that size of engine.
Cool toy but what is the point? Will we ever get to ride it? Will it ever be available?
For a 100,000 you can own one.
This overall design was brilliant when introduced by Mazda many years ago, and it’s still brilliant for several important reasons. But Mazda was never able to develop rotor seals, capable of holding up to the heat, friction and pressure loads they are subject to. Has this engineer worked that out? If so, I want one for my airplane.
Introduced by Mazda??? WtF!
Sachs was the first NSU-Wankel licensee to Introduced the Wankel KKM57.
Unfortunately the Wankel engine offers no advantages over reciprocating engine and has several major disadvantages.
This 1990s vintage Norton engine was originally designed by Sachs as the KC-60 developed for aircraft applications but abandoned due to reliability issues.
No aircraft manufacturers use Wankel engines
No Wankel engines have ever managed to pass a FAA or EASA airworthiness certification test.
Wankel engines are inherently unreliable and their MTBF is extremely low, unpredictable.
I believe they were intially sold for around 95000 GBP. And that is not a ridiculous price for a motorcycle? From a manufacturer no one had ever heard from? Who is kidding who? This world has gone completely mad!
@carsyoungtimerfreak1149 you try and buy any new race bike and see how much it costs.
People said that about Lamborghini at one point. He’s probably still losing money.
Crichton is an engineering legend...if I had a spare £95k,I would throw it on his table for one of those...only the clueless haven't heard of him...he deserves a MBE for services to engineering!
I like it, but no shock linkage...?
Possibly to keep the wheelbase short?
Brian mentioned about the links (or lack thereof) in the recording but it was cut for time. Maybe we'll do a short on the suspension?
Update: we did! th-cam.com/users/shortsqrDu7Lqd6dw?feature=share
Rotary way to go!
What is the torque of the engine and at what rpm is the peak power and torque?
Can you show a power graph
Max. Peak 220HP
Max. Peak RPM 10500RPM
Max. Torque 105 FT/LBS
Max. Torque RPM 9500RPM
Full engine information: rotronpower.com/rt690xe-rotary-engine/
@4:12: More vacuum, more power, more cooling, and then the sound of more methane.
I want one of those motors for my shifter kart….
If you do that, let us know because that would be something to see!
If we did some videos on karts would you be interested?
Only 96 subscribers??? ..... having watched THIS, I'm really not surprised! You neglected to ask him why the wheels are round?
will this bike start a revolution?
10500 of them, every minute!
When I win the lottery I'm buying 9 of these...
When will i be able to buy one
Never, Creighton is a notorious vaporware scam
Why so Negative, Wilhelm? 19 comments, none of them remotely complimentary about rotaries or those that develop them?
so why is it not in gp or sbk, i mean why havent manufacturers adopted it
MotoGP only for Italian. They won't let this beast enter their playground. CHICKEN
Interesting concept and execution… poor application considering the excessive oil consumption and the near complete lack of low/mid range torque that plague all Rotary engines ….that is unless you rev the snot out of it which you never see in any videos concerning this motorcycle…hmmmmm???
Well you can put turbo on rotor engine to get some torque but this will be much more complicated application.
These rotary motors of the Crighton design have never suffered from poor low or mid range torque. It is a fallacy that these Rotron or the previous Chrighton Norton bikes were gutless or peaky.
Also the 'excess oil consumption' you refer to is really quite minimal in reality.
I once rode one of the original Norton rotary bikes. The torque delivery was amazing, just like a huge electric motor.
@philhawley1219 Was that a Norton F1?
Well you have obviously never ridden a rotary engine. The power is linear all the way through the rev range. I've only rode a Norton Rotary water cooled engine and that had no engine oil usage couldn't comment on the car engines. It does use 2-stroke engine oil in the fuel by design.
Many "keyboard" experts on here...........LOL
What an amazing machine & one of passion..... Full credit to Brian for all the effort in making this a reality
Goes with the territory unfortunately. Glad you appreciate the efforts
Take my money!
Well... you could always try the Super Thanks button. You won't get a bike, but it'll help make more videos (!)
Torque curve on the wankel is wild.
Stunning bike. Does it have electronics? How did it keep the front down at such a rediculous power to weight ratio?
Rider skill/respect.
@@user-ii1iy8fz1d I would be disappointed if it was a wheelie machine and didn't have an aftermarket sophisticated electronics package to keep it in line
Here I've been throwing about the idea of making a single rotor version of this with half a Renesis or 13B,..
Let us know how you get on
Ok... you've got my attention. What's the cost???
Believe it's £95,000 but don't hold me to that. Only interested in the engineering
Why does it smoke so much on start up?
ロータリーはオイルを燃焼して潤滑してるから
It’s similar to a two stroke engine as it has a small amount of oil injected into the rotor housing for lubrication.
@@streddaz Oh okay, so it's a two stroke rotary
@@99.9percent9 only that it needs oil injection (or an oil premix) other than that they are very different. I’ve had a few rotary engine cars. A lot of power from a very small engine.
@@99.9percent9
No, it’s a rotary.
Most of Respect. Every time i think, the Rotary or Wankel engines are History, there are some new ones. Also Mazda surprises some weeks ago with a new fascinating Wankel.
Ah yes, the range extender system?
Yes. An intellegent system. Very interesting to me . . . . . !
Mazda canceled the range extender
The 35 kW/h battery with the range extender and I go to the dealer and buy one.
@@schraddel6571 The MX-30 was a huge flop... Mazda has announced that it will discontinue the model
Why does the rotor only fire once per revolution? Wouldn't it be more efficient and more powerful to fire on every "stroke"?
If I've understood it correctly (and I'm nowhere near as clever as Scarbs and Brian) each of the 3 faces of the rotor is the equivalent of an individual piston in a reciprocating engine.
A revolution is therefore a complete rotation of one of those faces, which in doing so passes through 4 quadrants of the rotor housing providing the 4 strokes.
For a single face of the rotor then, it is not possible to fire more than once per revolution as there is nothing to ignite until the next one.
If you take the rotor as a whole, it is always in 3 of the 4 Stokes at any one point during a revolution - much like a 3 cylinder inline engine would be, I suppose.
I really hope someone more knowledgeable than me turns up here soon to make more sense of this!
Imagine a single rotor dirtbike
I guess most people don't care, but the cloud of smoke would annoy me. Does it go away? A shot of it running without the cloud would have been awesome.
Apparently It does dissipate once the engine has warmed up, but we didn't have time to do that.
they only smoke a little when cold just after initial start up.
peripheral port にしては音量が低い。
220 HP ?!!!!!
I’ll take two please !
One for each foot?
@@TheRaceBayno dude, one for each humongous BALL! Obviously... 😂
Why so much smoke though?
It burns fuel/oil mixture
Make a 3 rotor version...
Why is that shock not tucked low and inside with a rising rate linkage on it? Bloody daft to use that configuration.
Because BC don't do linkages, and weight reduction.
Because all the vast experiments that Chrighton and his team did from the early days showed the rising rate linkage system to be far worse for rear end control than a conventional twin or single shock directly attached to the swingarm. The championship winning Duckhams bikes all had twin shock suspension.
@@howardosborne8647 Sorry but that is bad research. The rising rate gives you more appropriate control throughout the shock's stroke. If you add a complex multi-stage spring and valving setup (which adds bulk and weight) then you don't need rising rate. Otherwise you do.
No such thing as bad research just because it doesn’t line up with your theory.
Ooo,modern day Britten.
Now, there's an idea…
Poor Brian is stuck in the past... he has never moved on with his life since the 1990s.... pathetic.
This is very cool..and all that..but the biggest oversight is that rear suspension setup..that bike is absolutely useless without more modern linear suspension or some kind of linkage to make the rear predictable..that is like 75% of racing is making the power usable.
All the suspension experiments carried out ever since the early days of Crighton's developments proved that the shock unit/units mounted directly on the arm were more effective than cantilever or multi link systems. The Duckhams sponsored bikes they won the British championships with were fitted with twin gas shocks directly attached to the rear swingarm. The ultimate development of this was a reactive shock designed in conjunction with Williams F1 team
She's a good air pump.
What most people fail to realize... 700cc rotary = 1400cc piston equivalent... not because rotaries are better.... just that they displace their volume every revolution, instead of every other revolution.
The question.. How many gallons per mile uhh.. Sorry miles per gallon does it make?😊
Get your 1973 Suzuki rotary out the garage. Nothing new but updated.
Get your Hercules rotary out the garage.nothing new but updated
This needs to be let loose at next years iom tt.