Why does the MoCo measure engine temp at the front cylinder?
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Road Warrior
Joined: Nov 2005
Posts: 1,484
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From: Mountain View, California
Like you, I've replaced my air temp gauge with a cyl head temp gauge monitoring the rear cyl.i just installed. It yesterday a d the pickup is temporarily under the spark plug until I figure out a better place to put it
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Joined: Dec 2005
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From: poway
My 2000 ECM doesn't much care about temp other than to know when the engine is hot enough to go closed loop (I have a ThinderMax and O2 sensors) so it's up to me do care about heat.
Like you, I've replaced my air temp gauge with a cyl head temp gauge monitoring the rear cyl.i just installed. It yesterday a d the pickup is temporarily under the spark plug until I figure out a better place to put it
Like you, I've replaced my air temp gauge with a cyl head temp gauge monitoring the rear cyl.i just installed. It yesterday a d the pickup is temporarily under the spark plug until I figure out a better place to put it
Thread Starter
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Road Warrior
Joined: Nov 2005
Posts: 1,484
Likes: 82
From: Mountain View, California
@Max Headflow I've moved my cylinder head temp gauge pickup to the same spot as the the factory pickup, with the ring of the new one placed under the body of the factory one. I was amazed how vastly different the temp was there, as compared to when I had the pickup ring under the rear cylinder spark plug for a few days (just done as a test, not with the intent of leaving it there.)
I'm about to take a long ride through the desert southwest, with temps expected to be as much as 113. May I ask what you'd advise for temps that I might want to consider as "yellow zone" (the temp when I aught to start paying attention) and "red zone" (where it's time to pull over until things cool down)?
I'm about to take a long ride through the desert southwest, with temps expected to be as much as 113. May I ask what you'd advise for temps that I might want to consider as "yellow zone" (the temp when I aught to start paying attention) and "red zone" (where it's time to pull over until things cool down)?
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,930
Likes: 8,033
From: poway
@Max Headflow I've moved my cylinder head temp gauge pickup to the same spot as the the factory pickup, with the ring of the new one placed under the body of the factory one. I was amazed how vastly different the temp was there, as compared to when I had the pickup ring under the rear cylinder spark plug for a few days (just done as a test, not with the intent of leaving it there.)
I'm about to take a long ride through the desert southwest, with temps expected to be as much as 113. May I ask what you'd advise for temps that I might want to consider as "yellow zone" (the temp when I aught to start paying attention) and "red zone" (where it's time to pull over until things cool down)?
I'm about to take a long ride through the desert southwest, with temps expected to be as much as 113. May I ask what you'd advise for temps that I might want to consider as "yellow zone" (the temp when I aught to start paying attention) and "red zone" (where it's time to pull over until things cool down)?
.What I would note is that the motors are really like cold blooded animals. In other words under normal conditions at say 80F the head temp reads 290F then at 113F it should read 313F (add 23 degrees 113-80 - 23). Kind of go from there..
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Road Warrior
Joined: Nov 2005
Posts: 1,484
Likes: 82
From: Mountain View, California
I don't really know what your gauge is doing to say or if it too hot.. I would suspect that if it is measuring above 350 intake side front that it's too hot.. .
What I would note is that the motors are really like cold blooded animals. In other words under normal conditions at say 80F the head temp reads 290F then at 113F it should read 313F (add 23 degrees 113-80 - 23). Kind of go from there..
.What I would note is that the motors are really like cold blooded animals. In other words under normal conditions at say 80F the head temp reads 290F then at 113F it should read 313F (add 23 degrees 113-80 - 23). Kind of go from there..
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