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help with possible overheating...

 
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TonyD
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Joined: 26 May 2006
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PostPosted: Fri Jun 09, 2006 2:57 pm    Post subject: help with possible overheating... Reply with quote

my 400 seems to be running really hot... but then the temp line was resting on the header. if this is causing a faulty read.. then good! but if not, what degree themostat should i put in there?
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87calais
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PostPosted: Fri Jun 09, 2006 4:43 pm    Post subject: Reply with quote

I always favored a 195 in my 350.. .but I am odd like that... Rolling Eyes
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af2
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Joined: 01 Sep 2003
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1933 Willys Coupe

PostPosted: Fri Jun 09, 2006 7:08 pm    Post subject: Re: help with possible overheating... Reply with quote

TonyD wrote:
my 400 seems to be running really hot... but then the temp line was resting on the header. if this is causing a faulty read.. then good! but if not, what degree themostat should i put in there?


What is really hot??? Yes the line resting on an 1000 degree header will probably send it to the moon.
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cutlass389
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1978 Oldsmobile Cutlass

PostPosted: Fri Jun 09, 2006 7:10 pm    Post subject: Reply with quote

My personal preference is 195 in a computer controlled car and 180 in a non computer car.
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jonny_b
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PostPosted: Fri Jun 09, 2006 7:28 pm    Post subject: Reply with quote

I run a 160 in my camaro, heat is the enemy of power.
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cutlass389
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Joined: 29 Apr 2006
Posts: 268
Location: NC
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1978 Oldsmobile Cutlass

PostPosted: Fri Jun 09, 2006 7:58 pm    Post subject: Reply with quote

Of course each situation is different. Depending on the size and condition of the cooling system, shroud, etc. plus the output of a warmed over motor can make adjustments to the standards necessary. Plus the ambient temperature should be taken into account. I lived in Arizona for 18 years so that was always a big factor.
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jeep_406
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1972 Chevrolet Nova

PostPosted: Fri Jun 09, 2006 9:19 pm    Post subject: Reply with quote

I run a 160 thermostat in my 406 smallblock with a Griffin radiator, a Stewart water pump a steel flex fan and a shroud. My car runs at about 180 degrees in 90 degree weather. It will go up to around 195 with the air on in traffic.
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10sec.et
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Joined: 29 Mar 2006
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Location: Houston,Texas
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1969 Oldsmobile Cutlass

PostPosted: Fri Jun 09, 2006 10:21 pm    Post subject: Reply with quote

your t-stat will only control how hot the engine gets before coolant starts to flow through the radiator. WHEN does it overheat and how much? idling, driving, all the time? verify the stat is opening by checking the upper hose temp when the gauge reads slightly above the stat temp rating. if you can hold the hose with your bare hand then the stat is probably stuck closed. if it appears that the stat is opening at the proper temp then look elsewhere for your problem.

as far as t-stat temp goes, that depends on how hot or cold the weather gets. here in Houston Texas we really dont have winter so a 160-180 degree stat will work fine for non EFI, 180-195 with EFI

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Paul P
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1971 Chevrolet Chevelle

PostPosted: Sat Jun 10, 2006 9:47 am    Post subject: Reply with quote

I run a 180 thermostat in my 406 smallblock with a Griffin radiator, an Edelbrock water pump and a pair of Spal electric fans. My car runs at about 180 degrees in 90 degree weather. It will go up to around 195 fans running in traffic. Redline water wetter and an antifreeze mix good to -10* F helps as well.
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