Is 13.1 compression to high for ls/vtec?

 

For pump gas? Generally speaking yes, it's too high.

 

TOO HIGH I AM DOING AN LS VTEC AND I ONLY WANT LIKE A HIGH 11 OR LOW 12 CR

 

anything beyond 13 is quite high on pump gas (assuming 94 Octane rating)

 

What gas? For pump...depends on the cam.

 

I am running ctr cams

 

in the north east i wouldnt go over 12.5:1. 13:1 is quite high and ur gonna have to pull alot of timing out of it so that u wont knock.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bswain22 &raquo;</TD></TR><TR><TD CLASS="quote">Is 13.1 compression to high for ls/vtec?</TD></TR></TABLE>


Question for you....why are you running 13:1 compression?

 

I think 11:5 Cr is the ideal static ratio since you will be able to tune on pump gas and still run a big cam without running into detonation or pulling tons of timing. I dont know why people think they need to run crazy *** CR in order to make decent power..

 

12:1 is where its at, runs nicely on 93 pump. atleast thats approx what im running with p30's in a b18b block.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b20beast978 &raquo;</TD></TR><TR><TD CLASS="quote">I think 11:5 Cr is the ideal static ratio since you will be able to tune on pump gas and still run a big cam without running into detonation or pulling tons of timing. I dont know why people think they need to run crazy *** CR in order to make decent power..</TD></TR></TABLE>

i like this guy. advertised compression is completly different than ur actuall static compression. 11.5:1-12.0:1 should be the max on the east.

 

ok thanks guys for all the input. I will use the 11.5-12 comp. I knew it was high but like i said just trying to get everyones input. thanks again

 

good luck on your build bro!

 

im running 13.5:1 on my ls/vtec and its running pretty good! but then again im running 105 octane and its my daily driver

 

well 105 octane doesnt burn as fast as 93 buddy...

 

c16 everday...

 

i wish i could afford it

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by teh hatton &raquo;</TD></TR><TR><TD CLASS="quote">c16 everday... </TD></TR></TABLE>

and 17:1 !!!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b20beast978 &raquo;</TD></TR><TR><TD CLASS="quote">I dont know why people think they need to run crazy *** CR in order to make decent power.</TD></TR></TABLE>

I hear you on that.

 

You don't need that high of CR.

But yes. You actually CAN run 13.1 CR on 91 pump gas with a good tune. I've seen it done at the shop where my motor is being built.

But seriously, you don't need this.

 

Dynamic compression will also play a role in driveability w/ high compression engines.

(big cams )

 

yea if ur gonna go with a high compression i hope u choose the cams accordingly. 13:1 on 91 aint happening without pulling almost all of the timing out of it. i had an issue with a 12.5:1 setup on 93 lol let alone 13:1 on 91.