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Originally Posted by 94T88Widebody
...I understand that I have low compression. I fully plan to build a block that can keep up with my externals. I know now even with the low compressoin the car is running 788 to the wheels on C16 with 32psi of boost...
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Even at 32psi, your Supra's engine should not have detonated if you were running pure c16 (if properly tuned). On the other hand, if you were running anywhere near that boost level on 91 octane, we can be certain detonation is at least partly to blame for your melted plug and low compression. Also note that consistent 120's (or less) across the board is (ime) a quite unusual pattern for detonation damage: as a result, I believe there's still an outside chance that that running with a broken timing belt tensioner bracket might have 'tweaked' your valves...which in turn could be affecting your compression #s. Please verify if at all possible that you're still running stock cams (
very unusual with a setup like yours), which headgasket you're running, and whether or not your head has been decked.
I'd suggest that, as soon as we verify your spark is functioning properly again (after the CPS gear has been repaired), we begin troubleshooting on your engine's compression (and melted plug in #4) ... as well as the
various options to best resolve those problems. For example, we need to delve into: precisely state your horsepower goals, identify the exact type of fuel you plan to run (c16 full-time?), and detail your application (eg. drag racing?). Until we've identified all of these items, and gone through a proper troubleshooting process, it may be premature to conclude that your block must be 'built'.
Among the troubleshooting steps I'd suggest include another compression test (with a different gauge and some tips I'll give you to ensure optimal accuracy), followed by a
leakdown test...but again let's ensure your ignition is 100% fixed after you reassemble, and then we can get into the other issue.