Temp creep on 454 in my 69 - Chevelle Tech
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Old Jun 16th, 19, 5:04 PM Thread Starter
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Dennis
 
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Temp creep on 454 in my 69

I currently have a 454 bored 20 over in my 69 Chevelle. Temperature creeps up at idle or moving slowly when running AC. I have a 7 blade fan with the recommended hayden clutch. I am using a factory style fan shroud from a 72 BBC because it covers more area on the radiator than the stock 69 shroud. I have a 4 row brass type radiator. I am running 30% antifreeze with distilled water. Timing is controlled by a Holley EFI (throttle body) fuel injection system. Using an Edlebrock high flow water pump. I really don't want to go with an electric fan setup but will if that is the only way to correct the issue. Any suggestions on improving cooling for this application?
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Old Jun 16th, 19, 5:06 PM
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Eric
 
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Re: Temp creep on 454 in my 69

Temp creeps up to what?

Your just jealous because you can't hear the voices!

1967 Olds Cutlass 468 BBC/T400
1963 Plymouth Fury 440/Torqueflite
2007 Ford Mustang GT (momma's car)
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Old Jun 16th, 19, 6:19 PM
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Re: Temp creep on 454 in my 69

How far is the fan in the shroud?
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Old Jun 16th, 19, 8:45 PM Thread Starter
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Dennis
 
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Re: Temp creep on 454 in my 69

Higher that normal. Tomorrow I will use my laptop and get some exact numbers.
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Old Jun 16th, 19, 8:47 PM Thread Starter
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Dennis
 
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Re: Temp creep on 454 in my 69

About half way inside the shroud. I have between two inches and 1 1/4" distance from blade tips to edge of shroud.
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Old Jun 17th, 19, 12:24 AM
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Al
 
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Re: Temp creep on 454 in my 69

How old is the radiator? Might be time for a cleaning and rodding out. Maybe a recore or upgraded radiator.

If you go electric, you'll have to upgrade your electrical system to handle the extra load and still no guarantee that it will cool.

What is your current timing set at? If you can bump it up more it may not creep up as fast.

Can you hear the fan kick in? When it's hot, check to see if the fan clutch has kicked in. Shut the engine down and try to spin it by hand. It should have some deceny resistance to turning. If it spins easily your fan clutch is bad.
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Old Jun 17th, 19, 8:04 AM
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Eric
 
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Re: Temp creep on 454 in my 69

Quote:
Originally Posted by 69factorytach View Post
Higher that normal. Tomorrow I will use my laptop and get some exact numbers.
What are the temps at, extended idle and cruising at hwy speed. What temp rating thermostat are you running?

Your just jealous because you can't hear the voices!

1967 Olds Cutlass 468 BBC/T400
1963 Plymouth Fury 440/Torqueflite
2007 Ford Mustang GT (momma's car)
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Old Jun 17th, 19, 8:28 AM
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Lew
 
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Re: Temp creep on 454 in my 69

Couple of questions 1) what water pump are you running and how old; 2) are you using the stock pulleys that overdrive the water pump / fan like 20% from motor speed; 3) what kind of 454 are were talking about street, race etc compression? If you are having problems at idle and very slow speeds it is usually the fan, water pump, timing related - could be a bad radiator but we need more details on this. Also with AC on, the car will run like 20 degrees hotter so if were expecting the gauge not to move when you turned ac on that is not going to happen. The hot condenser really hurts on the cooling side. Do check the thermostat that is a quick fix.
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Old Jun 17th, 19, 10:20 AM Thread Starter
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Dennis
 
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Re: Temp creep on 454 in my 69

I am running an Edlebrock aluminum high flow water pump that is about 10 years old but with only about 13K miles. Using stock pulleys. The 454 is a 1973 model with around 10 to 1 compression running headers and a Holley EFI system. Mild build cast iron heads that have been port match to the intake. The thermostat is a 180 degree unit. Is there a special recommendation for a certain type thermostat?
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Old Jun 17th, 19, 11:47 AM
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Eric
 
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Re: Temp creep on 454 in my 69

The 180 is fine, I use a stant superstat.

Your just jealous because you can't hear the voices!

1967 Olds Cutlass 468 BBC/T400
1963 Plymouth Fury 440/Torqueflite
2007 Ford Mustang GT (momma's car)
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Old Jun 17th, 19, 12:00 PM
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John
 
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Re: Temp creep on 454 in my 69

Quote:
Originally Posted by 69factorytach View Post
I currently have a 454 bored 20 over in my 69 Chevelle. Temperature creeps up at idle or moving slowly when running AC. I have a 7 blade fan with the recommended hayden clutch. I am using a factory style fan shroud from a 72 BBC because it covers more area on the radiator than the stock 69 shroud. I have a 4 row brass type radiator. I am running 30% antifreeze with distilled water. Timing is controlled by a Holley EFI (throttle body) fuel injection system. Using an Edlebrock high flow water pump. I really don't want to go with an electric fan setup but will if that is the only way to correct the issue. Any suggestions on improving cooling for this application?
72 shrouds have a 19” opening. Is your fan 19”? If it is 17”, there’s your problem.
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Old Jun 17th, 19, 3:27 PM
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Glen
 
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Re: Temp creep on 454 in my 69

is it an original style 772 fan? that solved a lot of cooling issues on mine when I installed a 772 fan and clutch

1968 Chevelle
468 Big Block
Muncie M20 4 Speed
12 Bolt Posi 3.31:1 Gears
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Old Jun 17th, 19, 6:44 PM
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Stock 772 fan blade with a Hayden 2747 fan clutch works great with a stock cooling system. Sealing the area between the rad and the shroud with adhesive foam will also add to the benefit.

If you got a more than a stock cam you have to run more initial timing. Not trying to be a know it all. Just some things I learned on my 70 big block. I do have a 170 thermostat and 2-core Be Cool aluminum rad and the temps rarely get up to 195 in the summer heat of central Florida in stop and go traffic.

These are the tips I’ve read on here in the past and have used them with success. Hope this helps.
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Old Jun 18th, 19, 1:24 AM
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Re: Temp creep on 454 in my 69

That's a good brand of fan clutch, but how old is it? I've had clutches in the past that seemed to work and passed the newspaper test, but once they were changed the cooling problems went away. It's a $50-75 part. Not that expensive or time consuming to experiment, and it would likely fall under warranty for a return. Call around as Hayden makes their products under different names and one store will sell the same item for significantly more than another store. Also, I think Hayden makes three grades of clutches: Standard, Heavy Duty, and Severe Duty.
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Old Jun 18th, 19, 9:18 PM Thread Starter
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Dennis
 
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Re: Temp creep on 454 in my 69

Thank you for all the input. After taking some measurements I discovered the 72 fan shroud has a 21" opening and I was using an 18" fan. I am going to attempt use of a 19.3" all metal flex fan without a clutch and see what results I get. Will let you know how it turns out.
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