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Might go well with the short stroke crank. Doesn't help smoothness however.
Does a lightened flywheel add to rough running and/or harsher shifting? or do you mean a lightened flywheel will just maintain the 'unique' Guzzi rhythm?ThanksJim
I have read some engineering treatises that made the claim that with single and twin cylinder engines that a lightened flywheel actually decreases an engines ability to rev to high RPMs due to this .
I would like to read those treatises.
Probably Kevin Cameron . He DID build lots of really fast MC racing engines . Memory tells me that the idea is , at higher RPMs the lighter flywheel allows the engine to speed up and slow down more in each revolution , thus using more energy to accelerate the reciprocating mass after each power stroke .
Energy isn't used when the parts speed up and slow down, it's stored and released. That's the sort of argument that makes me suspicious.
My understanding is that the flywheel is the storage device . Now , in a multi cylinder engine , or a 2 stroke , the acceleration/decceleration is greatly reduced .
All the rotating parts share in the flywheel effect, including the "flywheel". No energy is lost due to acceleration of the rotating parts, either in the positive or negative direction. Things like friction lose rotational (kinetic) energy to heat. 16 cylinder 2-stroke, single cylinder 4-stroke, it doesn't matter, energy isn't lost as the parts speed up and slow down. But with a big flywheel, there is less change in angular velocity.I don't mean to derail the thread, but I do like to promote correct physics.
I have Ed's work and the B10 cam in my CX with no head work from the rebuild I did a few years ago. It occasionally stalls if I'm not thinking specifically about letting out the clutch so in some sense it is no different than before I made the change. It gets up to speed much faster than before and I noticed no difference in shifting,etc.
Probably Kevin Cameron . He DID build lots of really fast MC racing engines . Memory tells me that the idea is , at higher RPMs the lighter flywheel allows the engine to speed up and slow down more in each revolution , thus using more energy to accelerate the reciprocating mass after each power stroke . Remember , IC engines do not maintain a constant speed between power cycles . Dusty Edit , also , by maintaining a more constant crankshaft speed , the cam timing will stay more accurate . Cams have a really hard time keeping up with crank speed variations , especially with chain drive instead of gear drive . I'm thinking that those monster twin cylinder Hondas that Todd Henning raced , with Cameron built engines , used stock weight cranks and flywheels , and this is my reference .
It's well documented that Bonneville speed trial engines perform better with heavy flywheels.
Wondering if you changed the connecting rods in this engine? The CX engine and it's soul mate the SP of that time have weak rods compared to the LeMans and other factory built high output bikes.I only mention it because the only 2 Guzzi big blocks I have seen let go on a street bike were hopped up versions of that engine.Hunter
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