Hi compression Q's
 

My buddy Jack was asking me if he built a high compression stroker with 12:1 and he sprayed 100 wet or dry what octane should he run, would straight 100 octane work with say 22 degrees of timing?

Re: Hi compression Q's
 

I dunno what kind of timing an LS1 motor will usually take, I'd figure with 4-5 degrees of retard from full advance (on motor) and 100 octane he should be plenty fine.

Don't forget plug heat range. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Re: Hi compression Q's
 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Pro Stock John:
<strong> would straight 100 octane work with say 22 degrees of timing?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">With that much timing, your friend will most likely go <img border="0" alt="[kaboom]" title="" src="graemlins/gr_bomb.gif" /> Drop the timing at least in half.

Re: Hi compression Q's
 

I agree John....even the FI cars making 500rwhp on stock bottom ends are running 18-20 degrees of timing with zero KR.

My motor will be about 11:1 when it goes back in, and I plan on spraying eventually. I'd say with 12:1, you need to be fairly conservative at first. Try 20 degrees and see what happens, then work your way up. Only way to find out is trial and error.

Re: Hi compression Q's
 

ARE is my primary engine builder and they are reccomending that I run 18-19 degrees of timing to start with the new 12:1 setup and a 150 shot.

Re: Hi compression Q's
 

I would start out in the 18~19 degree range, then gradually build up until you do get some KR, then back it off 2 degrees. I say this assuming you will have forged pistons and be running race gas.

Re: Hi compression Q's
 

I errr I mean Jack has forged pistons (Ross) and will run straight 100 octane.

Re: Hi compression Q's
 

ls1290, why do you say that? Stock timing is let's say 28 degrees. I think 14 degrees of timing is too low.

I've been told to drop timing 2-3 degrees for every 100 shot of nitrous, so at say 200 shot we're thinking we'd run maybe 20-22 degrees of timing.