Just my $0.02 worth. I work as a tech in a new car dealership. I can't recall any of our vehicles running only 8.5 compression. Most of them are in the 9.5 to 11.5:1 range and recommend 87 octane. These modern engines also put out up to 400+ HP. Even the 4 cyl can get close to 300 HP with the factory turbo. Of course they also use variable valve timing and ignition timing to control detonation. I also remember detonation issues on cars of the mid 70s through the mid to late 80s because they were trying to raise temps and lean out mixtures to reduce emissions. Those things would "ping" with 8:1 compression on 87 octane and put out 110 HP with a 350 V-8. Anyway I'll keep running 87 in my M's since I don't use them that hard anyway and haven't had any problem yet.
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Today's Featured Article - Fabrication (Who Me? Make it myself?) - by Chris Pratt. First of all, what are the reasons for not fabricatin your own parts? Most judgements on what should be purchased rather than fabricated stem from: Originality - If the tractor restoration is to be 100% original, it is likely that you should spend the time and money to locate the component in the used or New-old-stock market. Since this can be extremely difficult, you may want to fabricate the item or purchase a modern replacement temporarily, but eventually, you s
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