We all know the octane ratings of E-85 and its benefits for performance applications. Just checking in to see if anyone's building a purpose-built E-85 motor with high compression (and perhaps even boost). If so, what ratio? For N/A, what's the highest compression ratio you should go with running E-85 compared to 93 octane? What about for a centri car running 11-12LBS of boost on the street (which is a bit more forgiving when it comes to boost and compression) Or what about an all-out twin screw 4.0 whipple with the most boost you can throw in it? Still safe to run a high(er) compression ratio? I know there's a guy in this board who bought the "N/A" aluminator longblock simply because it had higher compression, even though he was going to boost it and run it with E-85. I'm running 10.3:1 on 93 octane... and with 12 LBS of boost, and no problems yet. If there were more E-85 stations in my area, I'd take the compression ratio into consideration and pump it up! Since compression is the one "constant" in the motor once you've built it, you'd think that you'd go as high of a compression ratio as you could possibly get, and then manage detonation with all the other variables, such as fuel, timing, intercooling, meth injection, etc. etc and most importantly, a good tune. (Engine tuners: I'm sure there's MUCH more to that, but that's just my .02). Even ford is raising compression ratios on the 5.0 motors and even the ecoboost motors to 11:1!! But it would be awesome to see some wild high compression motors. 11:1? 12:1? 13:1???? Compared to my low compression 8.5:1 motor I previously had in my car, my 10.3:1 motor definitely has a more aggressive "cackling" idle. And definitely has better throttle response for around town driving. Interesting.