Hi guys,
I was wondering if anyone out there can tell me what exhaust temp I should be seeing??
I have melted the #3 exhaust valve on 2 engines... the first was a stock motor with over 190k miles on it so I wasn't real concerned with it. But then in June I blew the same valve in a stock rebuild with only 5 race weekends and about 3-4 test days on it. I finally got another motor together and went to a test day 2 weeks ago and got some numbers...
I drilled a small hole in the #3 primary tube about 10 inches away from the head and hose-clamped a thermocouple into it. Recorded things with a Mychron 3.
I decided to see if I could get any change in temp by trying to trick the ecu (using a stock ecu from an automatic car) into putting more fuel into the cylinders by lowering the voltage reading it sees from the O2 sensor.
with the stock O2 hookup I got up to about 2000F in full throttle on the straights, with my modification installed it only dropped to 1950F and I cut the voltage going to the ecu down to 75% of normal, so it pretty much seems like my modification did nothing.
Any ideas? Are these temps normal? If so, what brand of valves are you guys using to withstand this?
Thanks,
Mike
Hillbilly Motorsports
Just 'Cuz were willing to try it,
doesn't mean we know what were doing!
ITA 240SX #76
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