Hey guy'z!

after the LS7 427 , LSX 441 I built for my T/A

I've decided to build a smaller engine , An engine with can be street used and street race with it... H/C ls1 with 400 shot

I'm confusied with my engine compression and as you guy's have the excess experience of some points that I'm not sure of , please help me with this.

59cc Patriot heads. stg 2 ls6
forged 347 , stock ls1 crank , 6.200 rods , -2cc flat top 3.905 diamond pistons.
0.0041 cometic head gaskets
111 lsa cam < wonderin' if that was needed

notice: when assembling my engine , I polished my block's "on the heads place surface. So a very thin layer was gone out.

How much will my compression be ? I wish it's around 11.7

extra question
how can I increase it until 12 ?

Thanks!

 

anyone ?

 

To do this right !

Cylinder Diameter
Cylinder Diameter
Cylinder diameter
Stroke ( not rod size )
Head cc
gasket thickness (think you have few to many zeros
piston cc ( flat top , dome , reverse dome cc)
Deck height ( if the piston at tdc is in or out of the whole !
Some will even use gasket bore size!

To get more compression
Thinner Gasket
Deck the heads to reduce cc !
Ummm you can have the block deck to have piston come out .005 or so !
Crank shaft stroke !
But what you have know its really hard to tell you where you are !

 

Not 100 % but 11.6 would be a close guess!
Changing to .030 would get you almost 12
But if you are 11.6 you are not get see much benifet from a 200 dollar set of gaskets and not sure they even make them for your bore !

 

-2 cc pistons will get you 11.2

 

Thanks for the replies bro!
well ...
A mechanic calculated it and the compression it almost 11.7

 

You need to provide us with more data.

Go to this URL and fill in the blanks with data: http://www.kb-silvolite.com/calc.php?action=comp


Stop guessing and get the data.

Also, don't make your head gasket any thinner until you know the piston's deck height.

-

 

My piston deck hight is 0.10 under I'll check out the URL