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Tuning / Diagnostics -- engine and transmission Tune and diagnostics for engines and auto transmission.

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Old 05-10-2013, 03:26 PM   #1
pcguy2u
 
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Drives: 2009 Corvette ZR1
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Hot 350 or not

Trying to tidy up this 350 for the upcoming drag season and one of the things on my list is to determine if, and if, why it appears to run hot.

Started out this morning by checking the timing/vacuum which appears all in at 51 degrees at about 3000RPM. The problem I sense is the temp gauge is not a known quantity to me and the location of the sending unit is questionable – see photo.

I frequently see the gauge reading 210-220 cruising at 65 on a hot day and at the track after a run it can be a little higher. The problem may be related to the sender being between the 1 & 3 exhaust ports. I checked the sender with an infrared gun and when the gauge is reading 155 the infrared reads 195 and of course, this is not in itself comforting.

According to the infrared gauge, there is a 60-70 degree difference between the sender on the head and the sender on the back of the intake manifold for the electric fan.

I think I need to do something but I’m not sure if the engine runs hot or not.

How would you proceed?
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Old 05-10-2013, 04:22 PM   #2
willhe64

 
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51 degrees! What the hell. How has this not blown up yet? Our SBC won't even turn over at 43. We run 38, after extensive testing.

That's probably a wrong reading. The timing marks are out on your motor. Seen this too many times, so many different timing cover and balancer combo's out there.

Set the #1 piston at top dead and then see of the groove on the balancer is actually on the 0 mark of the timing chain cover.

Timing could be why you are running hot.
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