It may be worth undercutting the dogs, even though you have selector detents. Power pulses or spit-backs may cause jumping. (Carry a spare primary belt, just in case). Don't forget the breather on the box, or oil will leak/piss out of any available gaps/seals. Do consider some sort of Cush-plate in the clutch/drive-train, just to prevent self-destruction from torque pulses. Looking forward to the first self-propulsion!
I would have used a gearbox from an existing big bike as if anything is going to upset your project a gearbox is top of the list . there are lots of boxes out there and the engineers have spent millions on r&d and some company's have been in the game for decades. Adapt convert fit and enjoy....I do hope you have no problems with all the work you have done 👍🇬🇧
@@MrBradfordchild it didn't weigh that much and with all that torque (in theory) it should pull the gears. A bit of clutch slipping granted, but it'll work.
I love this :) i have one question wont it need cooling or any kind of Magnetic and or Filter ? I feel like there could be some Wearing in, that could build up some Grime, do you know what i mean ?
@@DatBlueHusky two would look good that's for sure. But do the maths and the engine doesn't call for a big carb. CFM numbers are very low due to the low rpm. It seems to run ok but time will tell.
All 4 stroke engines spend roughly 1/4 of the time sucking in air, so the carby always gets used for 1/4 of the duty cycle, regardless of RPM which becomes irrelevant. The sizing process for a carb is to work out the cross sectional area of the carb (Pi R Squared) to match the engine displacement. My 500cc bike engine has a 36mm dia carb (low performance bike) My 1000 cc (dual carb) bike has 500cc per carb and 50mm dia each (high performance) My 1700cc harley has a single carb of 60mm dia, which means each cyl displacement of 850cc gets a 60mm carb. (low revving mid performance)
I forgot to add the engine makers knew the air flow requirements and made the intake port the correct diameter, or maybe a bit smaller. Normally your carb is larger diameter than the intake port. Your engine looks to have a carb many times smalller than the intake port, immediately looking "wrong" to someone who has been working around engines for many years.
@@StoneEng Well you certainly can't rule out the size of the intake port chosen by the people that designed the engine. If you don't mind me asking, what is the internal diameter of that intake port, and what is the carb throat diameter? Carb should generally be 10% larger than the port.
It may be worth undercutting the dogs, even though you have selector detents. Power pulses or spit-backs may cause jumping. (Carry a spare primary belt, just in case). Don't forget the breather on the box, or oil will leak/piss out of any available gaps/seals. Do consider some sort of Cush-plate in the clutch/drive-train, just to prevent self-destruction from torque pulses. Looking forward to the first self-propulsion!
I think the dogs are already under cut.slightly.
I would have used a gearbox from an existing big bike as if anything is going to upset your project a gearbox is top of the list . there are lots of boxes out there and the engineers have spent millions on r&d and some company's have been in the game for decades. Adapt convert fit and enjoy....I do hope you have no problems with all the work you have done 👍🇬🇧
@@cedhome7945 that was the original plan, but after all the effort of making the engine a standard gearbox seemed like a cop out!
I’m trying to understand how a two speed box will work on this engine. No rev range to speak of, but massive torque usually requires many gears.
@@MrBradfordchild it didn't weigh that much and with all that torque (in theory) it should pull the gears. A bit of clutch slipping granted, but it'll work.
Great Progress.
Not even an exclamation point?? “Happy birthday.” Merry Christmas.”
I love this big size engine
Shades of Morgan 3 wheeler nice!
I love this :) i have one question wont it need cooling or any kind of Magnetic and or Filter ?
I feel like there could be some Wearing in, that could build up some Grime, do you know what i mean ?
@@NCPFunK yes. It's air cooled only. I'll do regular oil changes, there's no filter.
@@StoneEng Like a true Engineer :) Just like my grandfather
Bo selector!
I think that gearbox will be working very hard with that great big single. Does the rear wheel have cush rubbers?
harley doesn't use a cush.
@@ekspatriat real men don't use rubbers 💪 😁😁😁 Haha. Seriously though, there's no cush drive or compensator. I'll see how it goes as it is.
are you really running that engine with that single tiny carb? Would be cool to see if you can get 2 on there
@@DatBlueHusky two would look good that's for sure. But do the maths and the engine doesn't call for a big carb. CFM numbers are very low due to the low rpm. It seems to run ok but time will tell.
All 4 stroke engines spend roughly 1/4 of the time sucking in air, so the carby always gets used for 1/4 of the duty cycle, regardless of RPM which becomes irrelevant.
The sizing process for a carb is to work out the cross sectional area of the carb (Pi R Squared) to match the engine displacement.
My 500cc bike engine has a 36mm dia carb (low performance bike)
My 1000 cc (dual carb) bike has 500cc per carb and 50mm dia each (high performance)
My 1700cc harley has a single carb of 60mm dia, which means each cyl displacement of 850cc gets a 60mm carb. (low revving mid performance)
I forgot to add the engine makers knew the air flow requirements and made the intake port the correct diameter, or maybe a bit smaller.
Normally your carb is larger diameter than the intake port.
Your engine looks to have a carb many times smalller than the intake port, immediately looking "wrong" to someone who has been working around engines for many years.
You can't rule out RPM. It makes a huge difference. Check out carb size calculators online and put some dummy numbers in, you'll see what I mean.
@@StoneEng Well you certainly can't rule out the size of the intake port chosen by the people that designed the engine.
If you don't mind me asking, what is the internal diameter of that intake port, and what is the carb throat diameter?
Carb should generally be 10% larger than the port.