1.2mm is a perfectly acceptable number for the "squish" clearance (more properly known as "deck height", by the way). 1.2mm will still provide the desire "squish" affect and will not materialy lower compression when compared to 1mm deck height.put everything together and measured the squish.
at the moment everything is around 1.2 mm. (some are 1.18 and some are about 1.28)
My base gasket is 0.3 mm.
I think the recommended amount is 1 mm. 20 percent more sounds like a lot too me.
Do you think this is too big of a gap ?
I am running carrillo rods (don't know if they will stretch) and JE high compression pistons and bored up cylinders.
I am not looking for max performance, I just wonder if this is too big to run normally/efficiently.
I would be actually happy to use a little bit less compression in the hope I can use normal fuel instead of high octane but that is also a minor detail.
I like 1mm as a minimum for just about any road going, air cooled engine, but I have set race motors a bit tighter. Water cooling (like in the 600cc fours you mention) allows less clearance, since we don't see the wild swings in head and upper cylinder temps that air cooled motors suffer.Hi,
I am going to agree with Brad 100%. Check your mesurements the tightest point should be a the outer edge of the piston.
I am not a big fan of JE pistons I would rather use Pistal or Weisco. Maching the piston I would say was completely optional. I, myself, am using 11:1 Weiscos.
Higgy, I have never set the squish on a Motorcycle motor at more than .040" or 1mm... I have also set motors at a alot less than .040". You can set a 600cc 4 cylinder pretty tight and not worry about contact.