12 :1 compression safe for 91octane?
12:1 is perfectly fine! It's all about DCR, not static compression. Valve events brotha, open the intake valve earlier and longer, and you'll be fine. I'm running 12:1 in my 434, w/ a 235/251 114 cam, and we were still able to throw 30* of timing at it w/o detonation. Now, on 91, you'll want to back off the timing, but you'll be fine.
Well that is true if he backs off the timing, but then you have to ask yourself is it really worth all that. I mean if I was putting all the time, effort, and money into a nice motor with 12:1 compression the last thing i'd want to do is limit the timing just so I could run 91 octane. That's just my opinion of course...
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Well that is true if he backs off the timing, but then you have to ask yourself is it really worth all that. I mean if I was putting all the time, effort, and money into a nice motor with 12:1 compression the last thing i'd want to do is limit the timing just so I could run 91 octane. That's just my opinion of course...
12:1 is perfectly fine! It's all about DCR, not static compression. Valve events brotha, open the intake valve earlier and longer, and you'll be fine. I'm running 12:1 in my 434, w/ a 235/251 114 cam, and we were still able to throw 30* of timing at it w/o detonation. Now, on 91, you'll want to back off the timing, but you'll be fine.
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Then youre not doing what you initially asked about. If it is going to be a track car then it would probably be fine just putting 100 in there and running it that way. If this is a daily, you need to seriously consider your fuel choices. If youre going to be spraying the house down, go a point lower on compression and get a standalone with race gas.
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From: Hayward CA