How Do I build a 2.1L
Nov 1, 2010, 04:26 PM
#16
With 87mm bores and a .051" thick Cometic Phusion Head Gasket you would need pistons with a dish volume of approximately -2.6cc's to achieve 10.5:1.
Assuming a 1.130" compression height, .012" deck clearance and 43cc combustion chambers.
If you can find a thinner head gasket that is MLS and 87mm bores, then the piston dish volume requirement of -2.6cc's can go up.
For example with everything the same and you find a .039" HG or 1mm, your piston dish volume requirement to achieve 10.5:1 can go up to -4.4cc's.
If your engine builder is willing to resleeve your 4G64 back down to 85.5mm bores, then you can run any Evo Head Gasket and have much lighter pistons that could routinely get flogged up to 11k rpm no problem!
Assuming a 1.130" compression height, .012" deck clearance and 43cc combustion chambers.
If you can find a thinner head gasket that is MLS and 87mm bores, then the piston dish volume requirement of -2.6cc's can go up.
For example with everything the same and you find a .039" HG or 1mm, your piston dish volume requirement to achieve 10.5:1 can go up to -4.4cc's.
If your engine builder is willing to resleeve your 4G64 back down to 85.5mm bores, then you can run any Evo Head Gasket and have much lighter pistons that could routinely get flogged up to 11k rpm no problem!
or you can just buy the modified OEM MLS headgasket from AMS that they modify to fit the 87mm bore.
