crazeinc

Hey guys. My buddy want to sell me these incredible Bowtie heads that have had $900 worth of porting done to them for $1100!! Unfortunately, they're 56cc...I don't want to replace the pistons to keep the compression ratio below 10.5:1, so he just suggested that I get an ignition sysetm w/ timing retard box (MSD Digital 6) This seems cool because I can run without worries on 93 octane, but when I fill up with race gas at the track I can bump up the timing and see the full potential.

But, here's the question. Does a 11:1 CR engine w/ timing retard run slower than a 10:1 CR engine w/out timing retard?

------------------
The '82Z
Hugger Orange
383 4 bolt main
3000 lbs
Bad cornering
NOS Sportsman Fogged
10 bolt braker

Coming to a street near you in the spring...
The car's website

jcb999

Unless I am misunderstanding something, the timing retard is designed to work at WFO. Not at part throttle. It is very possible that you can get detonation at part throttle loads. You should go with sometype of ignition that allows you to modify the ignition curve from the box. The holley analiator race series for example.
I would get some flow numbers for the bowties. Some of the highest numbers I have seen for modified 23 degree bowties are in the 280cfm range. I would be more inclined to use a good aluminum head and that would give you more head room against detonation.

8Mike9

If you really want the head, have'em looked over "by one who knows" and see about the possibility of opening up the combustion chambers...should be able to pull 6cc's out without any ill effects...I'd think anyway.

Greg

My heads are 60cc and I think my compression is near 11.0:1. I hardly have any timing in the prom and operating temp is only 180 deg. I've wondered myself if it is faster with hardly no timing/high compression or lower compression/more timing. Anybody in Indianapolis area know where you can get high octane fuel?

------------------
'89 Formula 383 TPI