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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
An O2 is nice but an EGT gives one an idea of what everything is doing together. for example of if the intercooler is heat soaked or timing to advanced. These do not show up as warnings per say on an O2. Of course a single cylinder lean spot or detonation is probably not going to show.

Not sure how sensitive a motor at idle is the variations in heat due to a lean condition at idle. There is heat sensitive paint that racers use on brakes and headers to determine how hot they get. Each color at a given temp changes if a threshold it achieved. This could be something worth using.

Someone here used sensors that went under each spark plugs to watch cylinder temps. This is not as good as EGT but good for imbalance.


Sorry to hear about your failure. Any chance a ring was broken before the failure?

If I can ask:

What is your build? Cams, ports, boost, turbo, cast iron HF FD or alloy...

How much HP were you making?

Did you run safely for a long time with the 7th injector?

Was there a leak down or compression test any time before the failure?

Just curious.
Old 02-07-2010, 08:36 AM
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