let me first say that i have searched did ot really find the answer i was looking for.

ok so got a simple question here
if i put an LS crank in a stock GSR (B18C1) Block
will the compression raise or drop??

What would it then be as well??

 

Do you understand how an internal combustion engine works?

 

a simple answer would suffice here??

 

Give a man a fish...

 

The short answer is that an LS crank will raise compression.
Do your homework and find a compression calculator.

 

longer stroke, puts the piston higher then a gsr crank yes? increasing cyl pressure, therefore increase compression.

 

adding stroke by itself reduces chamber volume.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BIG T &raquo;</TD></TR><TR><TD CLASS="quote">a simple answer would suffice here??

</TD></TR></TABLE>


Seriously...it is unbelievably easy to find the information you want, not only on here, but messing with the online compression calculators as well. A basic understanding of the internal combustion engine will also give you your answer. People aren't going to hand you answers that are so easily found with a little effort...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b19coupe &raquo;</TD></TR><TR><TD CLASS="quote">The short answer is that an LS crank will raise compression.
Do your homework and find a compression calculator.</TD></TR></TABLE>

Why do you have to be such a spoil sport? Its not like this guy was asking "should i make sure my intake cam gear is tightened properly before Todd dyno's it?"

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IntegraType-R &raquo;</TD></TR><TR><TD CLASS="quote">longer stroke, puts the piston higher then a gsr crank yes? </TD></TR></TABLE>
If you use GSR rods, yes. Then your pistons may also make contact with your cylinder head. Compression calculations would then become moot. When using an LS crank it is recommended that you use LS rods. At that point the pistons should be at about the same height as with a GSR crank and rods.

And always tighten your damn cam gear(Steve) before Todd dyno's your motor so that he does not have a heart attack!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b19coupe &raquo;</TD></TR><TR><TD CLASS="quote">The short answer is that an LS crank will raise compression.
Do your homework and find a compression calculator.</TD></TR></TABLE>

well i was under the impression that it would raise the compression like you just stated i just was not sure if my info upon where i get the length of the rod and stroke was correct.

 

Most accurate compression calculator site I can think of

http://www.clubcivicquebec.com...f.php

 

i was answering his question I know which rods to use , he asked about compression tho.. of course it'll raise compression

 

Here is some good info on the subject.

https://honda-tech.com/zerothread?id=1837872

 

people tend to forget the why it raises comp...


if u have 2 bores at 80mm and one stroke to 95mm and one to 75mm if both tdc at .45 from the head using a 00 cc piston... which will have more comp and why?




Modified by Chris Tune at 8:00 AM 3/3/2008

 

The one with the longest stroke always will because you're compressing 20mm, or about 31% more stroke (cylinder volume) into the same size combustion chamber as the engine with only 75mm stroke. The more volume you compress in a given space, the higher the compression ratio.

 

ding ding ding ding... U WIN

i hate the kids that tell me i have 12.5:1 pistons... OHHH REALLY???!!?!? pistons comes with all real numbers less the "estimated comp" which some FAIL to put somewhere that they are estimates!

"i have a b16a with 13.5:1 comp"... cause piston say 13.5:1...