Question on built motor
Thread Starter
On The Tree
Joined: Apr 2007
Posts: 152
Likes: 0
From: Clemson, SC
Question on built motor Would it be possible to run an 11.5:1 CR motor on 93 octane pump gas?
Here are the specs on the short block I'm looking into
It's going to be a street car, but I want a N/A car so this is perfect, IF I can run pump gas in it.
Thanks
New LS6 block
Scat rods
Diamond "11.5-1" pistons with valve Relieves
stock crank
balanced and "blue printed"
He is asking $3200 for it
Here are the specs on the short block I'm looking into
It's going to be a street car, but I want a N/A car so this is perfect, IF I can run pump gas in it.
Thanks
New LS6 block
Scat rods
Diamond "11.5-1" pistons with valve Relieves
stock crank
balanced and "blue printed"
He is asking $3200 for it
Last edited by Black C5 Z06; Apr 30, 2007 at 07:25 PM.
is it a dome piston or something ? only way to get that high of a compression is with heads milled down to around 60cc or so,give or take a few cc depending on head gasket thickness.i ran 11:6- 11:7scr with 8:9-9:0 dcr just fine on 93 octane so you shouldn't have a problem with a good tune imo .if it is a flat top motor with maybe -2 or -4 cc pistons you will have less compression than stock unless you mill your heads/use thinner gaskets.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
It is not Static Compression Ratio (SCR) which determines if a cam will handle the octane, but the Dynamic Compression Ratio (DCR)
For an explanation just search in the web, you'll find lots of articles.
For an explanation just search in the web, you'll find lots of articles.
Thread Starter
On The Tree
Joined: Apr 2007
Posts: 152
Likes: 0
From: Clemson, SC
Originally Posted by PREDATOR-Z
It is not Static Compression Ratio (SCR) which determines if a cam will handle the octane, but the Dynamic Compression Ratio (DCR)
For an explanation just search in the web, you'll find lots of articles.
For an explanation just search in the web, you'll find lots of articles.
That's what it sounds like according to the article I read.
I'm probably wrong, so that's nothing new
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Originally Posted by Black C5 Z06
So, would the DCR be changed according to what cam I put in?
That's what it sounds like according to the article I read.
I'm probably wrong, so that's nothing new
That's what it sounds like according to the article I read.
I'm probably wrong, so that's nothing new
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Verdad Gallardo Thread Starter
On The Tree
Joined: Apr 2007
Posts: 152
Likes: 0
From: Clemson, SC
Originally Posted by slow trap
yes it will change.the bigger you go the less dcr you will have. something like a 232/234 xer lobe on say a 112 lsa+2 would work great with a pretty high dcr with 11:5 scr but something like a 236/240 on a 114 lsa or so would have quite a bit less dcr.
And how could I build a motor that can rev and rev and rev.
I don't want a ton of down low torque.
Yeah, you guessed it, I want a motor for road racing.
Now how could I build a motor like that? High compression?
Thanks for the help