8 to 16 valve conversion

[pullerpat]

Hi.
I have a 1100 2 valve per cyl and I was wondering if I could swap the top end on it ( juggs,pistons,head ) to convert it to a 4 valve per cyl.
Anyone done this.
thanks

[bwringer]

No.


.........

[rphillips]

No to both questions, No won't work, NO haven't done it

[mighty13d]

Anyone have any reasons why this wouldn't work. If for nothing more than to satisfy my curiosity?

[Hap Call]

Anyone have any reasons why this wouldn't work. If for nothing more than to satisfy my curiosity?

Different oil flow patterns in the two motors. The 16 valve head would be starved for oil.

Hap

[heathen]

is it the same for the 750?

[chef1366]

Buy a sixteen valve motor. :-D

[TheCafeKid]

Well, other than the obvious fact that the heads simply WONT bolt up from the two motors, others have touched on the oil flow channels. Completely different from the two motors. Yes they are both roller bearing cranks, but the 8v is a low pressure system, and I would assume the 16v is a high pressure system. Even barring that fact, you would spend an obscene amount of money figuring out a way to get the two to bolt up, and for that you could BUY a 16v motor in pristine condition.


Secondly, might I ask WHY ON EARTH you would want to do this? The horsepower increase is minimal, I think less than 20HP. Both are great motors, but I have a bit more faith in the durability of the 8v. Not that the 1100 16v is a sloutch (its CERTAINLY NOT the 750 16v hunk of poo) but I just dont see the benefit, even if it were possible, of doing such a conversion.

[mighty13d]

the only reason I asked for a "why" is because he asked IF it can be done and only got a no, not a reason why. So I figured I'd ask for a reason!! lol

[chef1366]

Well, other than the obvious fact that the heads simply WONT bolt up from the two motors, others have touched on the oil flow channels. Completely different from the two motors. Yes they are both roller bearing cranks, but the 8v is a low pressure system, and I would assume the 16v is a high pressure system. Even barring that fact, you would spend an obscene amount of money figuring out a way to get the two to bolt up, and for that you could BUY a 16v motor in pristine condition.


Secondly, might I ask WHY ON EARTH you would want to do this? The horsepower increase is minimal, I think less than 20HP. Both are great motors, but I have a bit more faith in the durability of the 8v. Not that the 1100 16v is a sloutch (its CERTAINLY NOT the 750 16v hunk of poo) but I just dont see the benefit, even if it were possible, of doing such a conversion.

Ride my bike once you'd change your tune!

[TheCafeKid]

Ride my bike once you'd change your tune!

Bill the 1100 is the ONLY 16v motor i would ever have interest in! ANNNND thats not fair cos your's ISNT stock :P

[SqDancerLynn1]

If someone had money $$$$$$$ to burn I guess it could be done. Would need External oil system, Custom hi dollar pistons, and a good machinist

[rphillips]

Good to know, I thought the 16 valve 1100 was low pressure & the 750's were the higher pressure. I know you could put the 750 oil pump gears in the 1100, to give it more volume.

[Hap Call]

Good to know, I thought the 16 valve 1100 was low pressure & the 750's were the higher pressure. I know you could put the 750 oil pump gears in the 1100, to give it more volume.

You are right, the 16 valve 1100 and the 8 valve 750 are low pressure & the 16 valve 750's are the "high" pressure. The reason is the type of bearings used on the crank. The 1100/1150/8V 750 use roller bearings and the 16V 750 uses plain bearing shells. One of the few items that are the same and have the same part number between the 8-valve and the '80-'83 16-valve 750 motors are the oil pump gears. The 1100/1150 has different stock oil pump gears, resulting in a slower turning oil pump. The addition of the 750 gears to the 1100/1150 oil pump results in the pump turning faster (not a whole lot, something like 15% to 20% faster, as I recall) but due to the nature of the low pressure system the result is that you get greater volume but not a significant increase in oil pressure.

I think the 16 valve 750 motor is an excellent engine. VERY smooth especially when compared to the 1100/1150. Not a hot rod but an excellent long distance motor.


Hap

[Nessism]

I have no personal experience regarding the differences between the 750 and 1100 but in support of Hap post, I'm a HUGE fan of smooth engines. All these bikes have surplus power so the quality of the power is what matters to me. Love the 850 for that reason; engine is butter smooth at normal cruising speeds. More power would be fun, but not as useful in my world if more vibration went along with it.