Mr.R
Hi Chris,
The 916 pistons have a different crown height to the 888 items, it's 1mm lower to allow for the longer stroke 916 crank.
Also the 888SP3,4 pistons should have 21mm gudgeon pins, whereas the standard 916 items have 20mm pins, the valve sizes are the same on these motors, the deeper pockets on the SP's are for the old style long duration cams.
All of this I know that you're aware of, I'm definitely not trying to teach you to suck eggs here mate.
So here's my question...
What else did you do to the 888SP 3 or 4 motor and what were the results??
Steve R
CJS
A yea of course . This one had a 916 crank hence reason for the 916 pistons.
The 888 pistons with those A/A cams just dont need tose deep pockets.
The engine was just a basic blueprint with some high comps already supplied , no porting or anything and to be honest i dont think it will ever see a dyno !
I would like to do a 916 or 888 with a 1mm shave running 748sps cams . Latest result for a 748sps with a little more compression and headwork revealed 115hp . .Powerband is quite narrow though . Getting the heads to flow needed lots of material from the chamber but i managed to replace the lost compression with a piston trick !!
