Quote:
Originally posted by Stephan Wilkinson:
Steve Weiner (porsche@rennsportsystems.com) twin-plugged my heads when I converted the engine from 3.0 to 3.4 liters and went to PMO carburetors. He match-flowed the heads and converted my existing SC distributor to a 12-plug distributor wearing what I believe is an RSR cap, and the the energy comes from two MSD systems with Blaster coils that I installed. Steve's your man if you want truly expert, experienced advice on this subject. He's done lots of these conversions.
Stephan
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What did this setup ballpark for $ wise?
As to 11:1 CR that is also being discussed isn't that a little high? I've always heard that 9.8:1 is pretty much the limit on pump gas, with most people saying that 9.5:1 is the best to run, since it makes allowances for bad gas, etc. Dual plugging the heads is reputedly good for another full point of CR, so maybe 10.5:1. I've heard that a crankfire setup is also good for a allowing a little more CR, but I don't know the specifics, and what crankfire combined with dual plug will allow. Anyone have a good rule of thumb with these mods?
I've been looking into the same sort of mods for a while, as I've suspected all winter I'd have to do at least a top end rebuild. So I'm interested too, is anyone running above 10.5:1 CR on pump gas with success for any decent length of time?
Thanks,
Adam