Tuesday, Jul 24, 2007 at 20:45
Mitch,
more air flow thru the motor with out additional fuelling will lower EGT. The compensator usually reduces fuelling as boost decreases to avoid over fuelling. 1HZ did not come ex factory with compensators fitted in Oz.
More air into the motor permits you to burn more fuel and maintain accepable exhaust temps, and burns more of the fuel in the combustion chamber rather than partially in the exhaust manifold.
However excessive combustion temps have been known to cause problems on 1HZ engines. If you fuel it up until you see black exhaust smoke you are very likely to cause some engine problems. The 1HZ is an IDI engine, unlike the 1HD engines which are direct injected (DI) engines.
Turning up the fuel is best accompied by a good pyrometer to avoid execessive temperatures. Ideally you would be looking for an / pyrometer with alarmso that you can be alerted when you exceed safe temperatures, as you will often be concerntrating on were you are driving, rather than instrumentation.
Mine is conservativelly set, and lets me know when the pre-set temperature has been exceeded with a moderate buzz until its back to a safer temperature.
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