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Old 05-22-2012, 11:01 PM   #159
raptor1956
Focus Addict
 
Join Date: Apr 2012
Fan#: 97725
Location: Taylorsville, UT
What I Drive: 2012, Sonic Blue, Focus Titanium

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Quote:
Originally Posted by eweisbard View Post
The main discussion here is an 87 octane engine being run on higher octane, and if ther would be an advantage. Like I said in my previous post, you cant trust 87 octane to be 87 octane. It could be 65. Known for a fact to be true at times. If you run poor quality fuel and switch to 93 you would probably notice a difference. They did not talk about at school the requirments of specific engines, just that if they are not knocking they dont need more octane. One thing that concerns me about this discussion is that everyone says that efi can adjust for knock from low octane, but at what cost. If timing must suffer for no knock then performance should too. But this is not even what the whole discussion has been about, it is extra octane, is there a benefit.
I'll as you again but in a different way ... is a 12:1 compression ratio engine an 87 octane engine?


Brian
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