Correct engine coolant temperature

[gbrtng]

Originally Posted by USAFPILOT

At what temp would damage to the engine occur? That seems to be more important than who's car runs the coolest and why?

Some years ago at an annual NCM ZR-1 Dave McLellan mentioned one of the prove-in tests was running 50 miles with a ruptured/cut coolant hose. He said the ECM goes into a limp-home mode where it cycles through alternate cylinders to keep the block temperature below meltdown but still provide some useable power. So there is some margin of safety above and beyond the factory thermostat and fan temperature settings.

[salvatore1]

Actually I discovered the main cooling fan (drivers side) was siezed up. All I had to do was replace the motor (cost $31 at napa) - problem solved.

[JAX S50]

I just pulled the radiator today and boy what a surprise about 50% of the area was blocked, anyway time for a new one where is a good source to get one?

[dbriana]

Originally Posted by JAX S50

I just pulled the radiator today and boy what a surprise about 50% of the area was blocked, anyway time for a new one where is a good source to get one?

Do you want another factory one or an aluminum dual core that cools much better?

[JAX S50]

Here is what I found yesterday

[JAX S50]

Originally Posted by dbriana

Do you want another factory one or an aluminum dual core that cools much better?

Well I was thinking the factory one because I heard that the dual core dosen't cool very well at low rpm/speed ???

[dbriana]

Originally Posted by JAX S50

Well I was thinking the factory one because I heard that the dual core dosen't cool very well at low rpm/speed ???

If you are going to replace it I would go with a DeWitts. It will cool much better, don't think it will matter about low rpm/speed.

[QB93Z]

I have replaced the radiator in two ZR-1's in the last year. I went with a DeWitts in one and a Ron Davis in the second one. I believe that the C4 radiator for manual transmission cars is NLA.

Here are some links to previous discussions:

http://www.zr1netregistry.com/forum/...ead.php?t=7737


http://www.zr1netregistry.com/forum/...?t=3713&page=2

Jim

[tomtom72]

Just a fwiw, Jim is correct our manual trans specific radiators are NLA from GM. The OE /GM replacement part is the auto trans radiator application. People, like GC aka Daryl, have used them and noticed no cooling issues with the trans cooler in the right side tank.