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#1 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,946
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Re: BBC temp creeps at idle; how did factory do it?
I have a transmission oil cooler on my truck, previously installed by my FiL. But it sits up at an angle behind the bumper, with little exposure to the wind. I considered putting fans on it, but now that I have the engine temperature controlled better, I'm thinking that I may not need to do that. Transmission temperature closely follows engine coolant temperature on my truck. Did you ask about an engine oil cooler? I don't have one, but maybe someone else does and can answer to that.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#2 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,946
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Re: BBC temp creeps at idle; how did factory do it?
A coolant recovery radiator cap has a gasket outside the one that seals the radiator. It sits right against the outer sheet metal of the cap.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#3 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,811
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Re: BBC temp creeps at idle; how did factory do it?
Although you don't seem to have an overheating problem, I'll throw this out there for future reference.
If you ever decide to upgrade your heavy duty Hayden #2747 fan clutch, the correct Hayden severe duty unit is #2797. See the link in post #6 above for differences & basic specs.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#4 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,946
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Re: BBC temp creeps at idle; how did factory do it?
I went from the 2747 to the 2797 before I finally tumbled onto the high flow thermostat. When the 2797 wears out eventually, I will try the 2747 again, as it is nearly brand new.
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#5 |
Registered User
Join Date: Apr 2014
Location: California
Posts: 1,001
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Re: BBC temp creeps at idle; how did factory do it?
Just for documentation's sake, I replaced my original style 4 core brass radiator with a new unit from speedcooling--this new radiator has two cores that are 1" long each.
https://speedcooling.com/1967_1972_C..._Radiator.html It behaves the same as my first post highlights. I'm gonna guess the 4 core I removed was working perfectly fine. I am going to abandon my heat creep issue and install A/C and see what happens. Part of my plan with the A/C is to install a pusher fan in front of the condenser to help lower A/C temps and maybe help with engine temps. The saga continues. |
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#6 |
Registered User
Join Date: Apr 2009
Location: PNW
Posts: 553
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Re: BBC temp creeps at idle; how did factory do it?
There is nothing wrong with your coolant temps.
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#7 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,946
|
Re: BBC temp creeps at idle; how did factory do it?
True. 205F is far from the realm of damaging a BBC. FWIW, I've had mine to 260F when pulling a 6000 pound trailer up steep hills. I found the best relief was a high flow thermostat. I'm sensitized to the thing running hot, as a result, so I bought a bigger fan and made my own shroud, just to keep the temps down. But this truck has always run hot in the entire 41 years of my experience with it (we inherited it in '09). If you stopped for gas, you'd better plan on having lunch, because unless you left it running, it won't be moving off the pump block for at least half an hour.
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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