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

 

Moving to internal.

 

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.

 

Watch out for DCR.

 

Yeah, sorry, I realized I put it in the wrong section like 10 minutes after I posted up

What's DCR?

 

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.

 

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

 

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.

 

Well would high compression like that be good for a high revving motor?
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