ZR-1 Net Registry Forums - Correct engine coolant temperature

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ZR-1 Net Registry Forums (http://zr1.net/forum/index.php)

- C4 ZR-1 Technical Postings (http://zr1.net/forum/forumdisplay.php?f=9)

- - Correct engine coolant temperature (http://zr1.net/forum/showthread.php?t=8812)

gbrtng

06-07-2009 01:52 PM

Re: Correct engine coolant temperature

Quote:

Originally Posted by USAFPILOT (Post 63398)

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

06-07-2009 03:21 PM

Re: Correct engine coolant temperature

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

06-09-2009 02:26 AM

Re: Correct engine coolant temperature

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

06-09-2009 10:42 AM

Re: Correct engine coolant temperature

Quote:

Originally Posted by JAX S50 (Post 63834)

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

06-09-2009 10:57 AM

Re: Correct engine coolant temperature

1 Attachment(s)

Here is what I found yesterday:(

JAX S50

06-09-2009 10:59 AM

Re: Correct engine coolant temperature

Quote:

Originally Posted by dbriana (Post 63852)

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

06-09-2009 11:27 AM

Re: Correct engine coolant temperature

Quote:

Originally Posted by JAX S50 (Post 63855)

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

06-09-2009 01:56 PM

Re: Correct engine coolant temperature

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

06-10-2009 10:25 AM

Re: Correct engine coolant temperature

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.

:cheers:

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