Quote:
Originally Posted by
Freez
I have been doing a lot of research into all kinds of performance parts and if the XT and raptor sleeve length is the same, then it might be possible to increase compression without replacing the piston. Taking the stock XT's 10:1 compression to around 11 and maybe a bit higher. That compression should be fine with a nice high octane fuel you can get from a normal fuel station and should add 1 or 2 HP.
If not, we can still increase compression with playing around with the head, but both options becomes a bit more complicated than just adding a new high compression piston.
Kev, do you know the combustion chamber volume on the stock XT head?
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I was going to measure the swept volume when I stripped my motor but did not need to in the end to fit the Raptor piston.
It is easy to machine the cylinder base, to up the compression ratio. Then degree the camshaft to get the cam timing right. One would need a slotted sprocket & once the cam timing is set you would pin the sprocket to the camshaft.