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Originally Posted by pk2
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I have forced induction and a piggyback AIC (or call it a DME-lite) that leaves whatever Porches intent was as far as induction & ignition goes, somewhere back along the road.
Your right I suppose that more energy might create more heat but, a blower adds alot more though, an easy 125+ degrees to the intake temp. The hotter the charge the more it is likely to detonate.. Knock sensors will solve that by retarding the timing but, start Kissing performance away to.
The setup as designed is really pushing the limit on 93 octane (probably pre ethanol 93). We only have 91 oct. (except for 2 or 3 places across town) So, just to get it to that minimal 93, I have to brew my own from 91 and 100. I can't pretend to notice the dif between 93 or 91. I've been leed to beleive higher octane it a cooler burn. Keeping my piston from burning (they can) is my only concern. This thread complicates things a bit.
PK
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Adding a forced induction system to a high compression engine will certainly require an increase in octane rating in the fuel you use for safety. Compression pressure is higher, mixture temp is higher, cylinder temps are higher, the potential for hot pieces of residual carbon setting off the mixture prematurely is higher. Everything is there to allow for an unintended ignition. You would want the increase in octane to resist the chances. Actually, it's popular within the tuners of turbo engines to use E85 (speaking of E85) because it's octane rating is very high, which allows for high boost levels beyond what you can do on pump gas.