Just tested my B18C1 w/ CTR pistons and massive headwork done and got these numbers:
260
255
250
260
Its within the parameters of good compression, just wondering how i would go about converting that number to the actual compression ratio. Also, is that lower than it should be for an engine that should be 12.1:1?
Thanks

 

pretty nice numbers...

 

Well you're compression #s are going to vary with your cam selection. Either way, a stock gsr runs around 200s(like 220 new I think) so you're looking good.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BDBGoalie1982 &raquo;</TD></TR><TR><TD CLASS="quote">Just tested my B18C1 w/ CTR pistons and massive headwork done and got these numbers:
260
255
250
260
Its within the parameters of good compression, just wondering how i would go about converting that number to the actual compression ratio. Also, is that lower than it should be for an engine that should be 12.1:1?
Thanks</TD></TR></TABLE>

You can't determine compression ratio from compression test results.

Use the calculator on c-speedracing.com and see what you get.

 

we got 280 psi accross the board on a motor that shoulda been around 12.5:1

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 3.504 &raquo;</TD></TR><TR><TD CLASS="quote">we got 280 psi accross the board on a motor that shoulda been around 12.5:1</TD></TR></TABLE>

mine is suppose to be 11.8:1 but i pinned 300psi per cylinder

 

yeah your numbers with ctr pistons in a b18c1 should easily be between 280 300psi

 

Well, we ripped open the block, and they were PR3s not CTRs, previous owner lied.
oh well