CR for LS head/block and p30 pistons

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12-28-2001, 06:38 PM

Speedz

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CR for LS head/block and p30 pistons

ok, i'm building a LS bottom end..
using Eagle rods, and i want to use the P30 (b16) pistons. 10.4:1 CR.
and i'm using the LS head.. what would my CR be?

thanks in advanced.

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12-28-2001, 09:51 PM

rainforest

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Re: CR for LS head/block and p30 pistons (Speedz)

its around 11.0.1 ok the ls/b20 head has a combustion chamber of 45cc's so you will get less compression then it on a b16/b18 they both have smaller combustion chamber.

[Modified by rainforest, 6:55 AM 12/29/2001]

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12-29-2001, 02:36 AM

sgT

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Re: CR for LS head/block and p30 pistons (rainforest)

It should be closer to 11.5-12:1 if you are using the JDM p30 pistons.

Also i would recommend you use aftermarket pistons since the rods are full
floating, to use the factory pistons you will have to have retaining clips machined
into them to use the eagle rods. The cost of the stock pistons(which will probably
be more than regular US pistons because they are JDM) plus the cost of having
the retaining clips will probably equal the cost of aftermarket forged pistons.