CP Pistons Compression.
#1
CP Pistons Compression.
got this info from a dealer.
89mm stroke with B16 Head = 9.7:1 CR
87mm stroke with B16 Head = approx. .5 pt lower.
what will a GSR head yield with these pistons on a GSR Short block with the 87mm
stroke?
89mm stroke with B16 Head = 9.7:1 CR
87mm stroke with B16 Head = approx. .5 pt lower.
what will a GSR head yield with these pistons on a GSR Short block with the 87mm
stroke?
#2
Honda-Tech Member
Re: CP Pistons Compression. (BoostedbyFastrax)
I would need to know what model number piston you are talking about to give you an answer. It would also help to know how thick a head gasket you will be using. I can also give you dome volume numbers for any model. What dealer did you get your info from?
#3
Re: CP Pistons Compression. (earl)
earl, spec sheet says shelf part # SC7018 and outside the box is 27566. piston is 84.5mm for gsr block. plan to use .043 cometic hg. got it from a local dealer that says it was supplied from race engineering.
#4
Re: CP Pistons Compression. (BoostedbyFastrax)
9.40:1 with a GSR/ITR stroke of 87.2mm and a .043" Cometic gasket and GSR head approximately. The dome displacement should be approx -6.2cc
#5
Honda-Tech Member
Re: CP Pistons Compression. (BoostedbyFastrax)
84.5 mm bore
87.2 mm stroke
41.6 cc chamber b18c head
.043" thick head gasket
-7.2 cc dome volume (SC7018)
.020" piston in the hole
9.44-1 compression ratio
How far down the hole the piston sits will affect this ratio.
to play with combinations, go here
http://www.c-speedracing.com/h...c.php
87.2 mm stroke
41.6 cc chamber b18c head
.043" thick head gasket
-7.2 cc dome volume (SC7018)
.020" piston in the hole
9.44-1 compression ratio
How far down the hole the piston sits will affect this ratio.
to play with combinations, go here
http://www.c-speedracing.com/h...c.php
#6
Honda-Tech Member
Re: CP Pistons Compression. (Boostfed)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Boostfed »</TD></TR><TR><TD CLASS="quote">9.40:1 with a GSR/ITR stroke of 87.2mm and a .043" Cometic gasket and GSR head approximately. The dome displacement should be approx -6.2cc</TD></TR></TABLE>Very good approximation...who needs a calculator
#7
Re: CP Pistons Compression. (earl)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by earl »</TD></TR><TR><TD CLASS="quote">84.5 mm bore
87.2 mm stroke
41.6 cc chamber b18c head
.043" thick head gasket
-7.2 cc dome volume (SC7018)
.020" piston in the hole
9.44-1 compression ratio
How far down the hole the piston sits will affect this ratio.
to play with combinations, go here
http://www.c-speedracing.com/h...c.php</TD></TR></TABLE>
The LS/GSR/ITR show as .030" piston to deck height. If it is -7.2cc then it will be 9.46:1 CR
87.2 mm stroke
41.6 cc chamber b18c head
.043" thick head gasket
-7.2 cc dome volume (SC7018)
.020" piston in the hole
9.44-1 compression ratio
How far down the hole the piston sits will affect this ratio.
to play with combinations, go here
http://www.c-speedracing.com/h...c.php</TD></TR></TABLE>
The LS/GSR/ITR show as .030" piston to deck height. If it is -7.2cc then it will be 9.46:1 CR
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#9
Honda-Tech Member
Re: CP Pistons Compression. (Boostfed)
We can only really guess on the piston to deck height. Who knows if the block has been decked. The C5 CP Pistons come with a zero deck height as standard. On these kind of deals, you really don't know what to expect until you throw a piston in.
#11
Re: CP Pistons Compression. (earl)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by earl »</TD></TR><TR><TD CLASS="quote">We can only really guess on the piston to deck height. Who knows if the block has been decked. The C5 CP Pistons come with a zero deck height as standard. On these kind of deals, you really don't know what to expect until you throw a piston in. </TD></TR></TABLE>
True only TRUE way to do it is cc the head and then the piston in the block.
True only TRUE way to do it is cc the head and then the piston in the block.
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