dr20t wrote:Ej20y heads have a tiny combustion chamber (48cc from memory). Even with a 10cc dish on the je pistons, and assuming a 0.8mm quench area and 0.7mm compressed headgasket thickness comp as follows
Total capacity 2457cc
Or 614.25cc per cylinder
99.5mm bore
95mm stroke
Bore radius 49.75mm
Working backwards:
Head Combustion chamber volume 48cc
Plus area of squish (49.75x49.75x3.142x0.8mm) = 6.2cc
Plus compressed head gasket area (49.75x49.75x3.142x0.5mm) = 5.44cc
Plus 10cc piston dish
Total compressed area in cc at tdc is 69.66cc
Static comp = 614.25:69.66
= 8.817:1
Mick
dr20t wrote:Dual avcs ej20y heads are z20
Definitely get the chambers machined out.
bigBADbenny wrote:You'll find a full heads FAQ on nasioc.
Or rather a bunch of related threads:
I started by googling "nasioc d25 heads" or similar...
Not sure what the code for the 2l heads is...
Ports:
http://forums.nasioc.com/forums/showthread.php?t=903873
Scroll down for links to the other good threads inc:
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