Cp 3026 Pistons

[lcxu105]

Hi. Would anyone know what comp ratio these pistons would give me with a neo head. Zero deck height.

[Blackkers]

have you CC'd the head?

[lcxu105]

Neo head is 55cc

[GTSBoy]

Other posts on this forum suggest Neo chamber volume is 51.5 cc. Webbersrbguide suggests between 50 and 53cc.

Anyway, without some data on the original pistons, assuming that those pistons are flat top and you have zero deck height at the block, and ignoring head gasket, it's just a matter of dividing 467.8 by 51.5 and getting 9.1:1 compression ratio. Which comes out as less than stock.

467.8 is (2498/6) + 51.5, in case you were wondering.

[lcxu105]

Its a rb30 bottom end so working on that its much higher

[lcxu105]

So a -10cc piston with zero deck height and neo head 51.5cc will be better. 8 to 1 so allows room to deck the head and bring it up and run smaller head gasket thickness. I will be running 25psi boost with a gtx3582r. 1000cc injector with e85

[lcxu105]

87mm bore

[lcxu105]

Spoke with my engine builder today. It works out with a 1mm head gasket 8.44 to 1 so should be fairly good off boost too.

[KiwiRS4T]

Not enough - you want better than 9 to 1

[lcxu105]

Really. Well I could always shave the head and run a smaller head gasket thickness if available.