Quote:
Originally Posted by tjmr2
The 4AGE is a high compression engine
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9.4:1 is not high compression in my book. In fact it's rather low, particularly for a relatively modern engine with EFI and pentroof combustion chambers. In most parts of the world they (bigport 4AGEs) will happily run forever on 87-octane swill,
if they are properly tuned and maintained. Sadly, most of them are not.
If he had detonation issues bad enough to bust all four pistons, either they were comically cheap (non-OEM) pistons, or there was a serious tuning or neglect issue, like massive carbon deposits, grossly incorrect ignition timing, chronically lean fuel mixture under load (dirty filter or clogged injectors), etc.