Quote:
Originally Posted by derm.1785
Hi. I’m about to start rebuilding my 3.0SC, I’ve already got some 98mm cylinders that are going for a re plate and hone , I’ll get the cams reground to suit whatever o need but I’m looking at new 98mm pistons, 70.4mm stroke and 22mm pins. I like the price of Wossner but their 11.1 CR is too high “possibly, Carrillo do a 10.1 and JE have several but are a bit more money. I’m UK based so import costs are steep but petrol octane is high so I can get away with higher CR. I would like some solid advise on piston choice and CR for my needs. Thanks in advance.
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Probably need to know your fuel delivery system too...CIS, itbs, CARBS?
This will dictate how big a cam you can run, which will determine how much compression you can use.
If keeping CIS, you are limited to 964, webcam 20/21 or William Knights M1 cam.
With Williams cam, you will be able to run a little more compression but I would imagine you should err on the side of caution and go for 9.5:1 unless twin plugging.
But either way, let someone like William know your engine parameters and he can help you choose cams and compression that will work with your setup.
He has helped design a few engines for me now and every one of his predictions have been spot on.