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  aluminum heads and engine temps.

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Author Topic:   aluminum heads and engine temps.
dhearn
Gearhead

Posts: 240
From: Owenton Ky,USA
Registered: Nov 2000

posted 07-25-2002 10:32 AM     Click Here to See the Profile for dhearn   Click Here to Email dhearn     Edit/Delete Message   Reply w/Quote
I have finally got my aluminum Ebrock heads installed and drove the car some and I have found that I cant let it idle or it will get hot. I never had this problem before with the stock heads. It stays cool while driving but gets hot while idle so I know I need to buy and install a fan shroud but why the difference? Does the aluminum transfer heat faster than cast or do I have a problem that I need to address?

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1969 MACH 1
THE FEEL AND SOUND OF A FORD V-8 IS ALL THE DRUGS A MAN NEEDS

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JAAZZY
Gearhead

Posts: 772
From: Bay Area, CA
Registered: Apr 2001

posted 07-25-2002 12:22 PM     Click Here to See the Profile for JAAZZY     Edit/Delete Message   Reply w/Quote
It seems to me that I might have had the same thing happen but I did several other mods so just assummed that it was the higher hp engine that caused this...hmmm...

I upgraded my cooling system though so it runs cool unless I sit for a long time like idling in the tech line at the track.

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steve'66
Gearhead

Posts: 8754
From: Sonoma,CA,USA
Registered: Mar 2000

posted 07-25-2002 10:40 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Dennis,

The aluminum heads didn't cause this. Have the cooling system checked. Did you increase the compression? Our 408w (stroked 351w) with Edelbrock Vic Jr heads stays cool with a simple 4 row copper radiator and a cheap electric fan. And it is making about 550 h.p. (really) with 12-1 compression.

SteveW

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kcode
Gearhead

Posts: 2983
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99

posted 07-25-2002 11:48 PM     Click Here to See the Profile for kcode   Click Here to Email kcode     Edit/Delete Message   Reply w/Quote
Dennis,
I agree with Steve, my 347 with Edelbrocks stays in the middle of the gage range with a three row radiator and fan shroud. This might sound like a stupid question, but are you sure the head gaskets were installed correctly, this will effect circulation.

Mike

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dhearn
Gearhead

Posts: 240
From: Owenton Ky,USA
Registered: Nov 2000

posted 07-26-2002 08:21 AM     Click Here to See the Profile for dhearn   Click Here to Email dhearn     Edit/Delete Message   Reply w/Quote
I am reasonably sure the head gaskets went on right I installed them and I dont have any problem with the temp if I am moving down the road and I am thinking that I wont have any problem once I install a fan shroud. but there is a difference somewhere, Oh yea, I dont think I changed the compression as the 69 heads are supposed to be 58-60cc and the e-brock heads are supposed to be 58-60 so in the extreme I could have changed it by 2cc's. I also have a 4 core radiator. I guess Ill just have to be careful and keep an eye on the temp cause I have no plan to remove the heads unless something ugly happens.

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Hell_Fish
Gearhead

Posts: 860
From: Austin, TX.
Registered: May 2002

posted 07-26-2002 02:02 PM     Click Here to See the Profile for Hell_Fish   Click Here to Email Hell_Fish     Edit/Delete Message   Reply w/Quote
If the cc's are the same, you lost compression. The heads should keep cooler. How old is the engine?

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Dustin C
[IMG]http://pages.moparpages.com/duster/sigs/hell_fish.gif[/IMG]
56 F-100
Mech. for wifes 69 Mustang coupe
65 Plymouth Barracuda
70 Dodge Swinger

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mustangboy
Gearhead

Posts: 773
From: Ont, Canada
Registered: Mar 2002

posted 07-26-2002 09:22 PM     Click Here to See the Profile for mustangboy     Edit/Delete Message   Reply w/Quote
If the CCs remained the same how did he lose compression?I drove a buddy's 66 coupe 306 with Vic Jr heads and no thermostat(just a restrictor).It was a cool fall night,about 60 degrees out and I could not get the temp up past 140 on the motor.I pulled over and let the car idle trying to get the temp up but it just stayed at 140 so I don't think its the heads that are causing you to heat up.I believe if the head gaskets are installed backwards you would have no coolant flow at all and the motor would over heat very quickly.

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V8 Thumper
Gearhead

Posts: 4370
From: Arizona
Registered: Dec 2001

posted 07-28-2002 01:39 AM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
I'm not sure about the Edelbrocks, my Trick Flow heads have a later model steam relief hole pattern (about 1:30 clock position over each cylinder) as opposed to the 'straight up' pattern on early blocks & heads. I needed to drill 8 additional holes in my decks using a head gasket as a template to resolve the potential (probable) overheating problems associated with late heads on early blocks. Did the Edelbrock install documentation make any reference to this procedure?

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Hell_Fish
Gearhead

Posts: 860
From: Austin, TX.
Registered: May 2002

posted 07-28-2002 01:45 PM     Click Here to See the Profile for Hell_Fish   Click Here to Email Hell_Fish     Edit/Delete Message   Reply w/Quote
Because, aluminum cools so much faster than cast. Heat is part of the formula for compression.

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Dustin C
[IMG]http://pages.moparpages.com/duster/sigs/hell_fish.gif[/IMG]
56 F-100
Mech. for wifes 69 Mustang coupe
65 Plymouth Barracuda
70 Dodge Swinger

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Calcat
Journeyman

Posts: 75
From: Los Angeles, CA
Registered: Feb 2002

posted 07-29-2002 02:18 AM     Click Here to See the Profile for Calcat   Click Here to Email Calcat     Edit/Delete Message   Reply w/Quote
Heat has no effect on static compression.

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Pierre
Gearhead

Posts: 541
From: Near Paris, France
Registered: Apr 2002

posted 07-29-2002 05:19 AM     Click Here to See the Profile for Pierre   Click Here to Email Pierre     Edit/Delete Message   Reply w/Quote
Since I installed my EDEL 6025 heads on my 302, temp dropped drastically and the gauge never exceeds 20% even in 100s. Can't be your heads !

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dhearn
Gearhead

Posts: 240
From: Owenton Ky,USA
Registered: Nov 2000

posted 07-29-2002 05:32 PM     Click Here to See the Profile for dhearn   Click Here to Email dhearn     Edit/Delete Message   Reply w/Quote
Somebody kick me......I think I got the problem fixed. Seems that when I filled it up with coolant before my first test drive I must of had a big bubble trapped in the heads and intake I went out yesterday and checked the water level and I could see none tooke about a gallon to fill it up. I havent let it idle very long yet but it didnt heat up after about 10 minutes.

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1969 MACH 1
THE FEEL AND SOUND OF A FORD V-8 IS ALL THE DRUGS A MAN NEEDS

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Hell_Fish
Gearhead

Posts: 860
From: Austin, TX.
Registered: May 2002

posted 07-30-2002 02:26 PM     Click Here to See the Profile for Hell_Fish   Click Here to Email Hell_Fish     Edit/Delete Message   Reply w/Quote
Glad to hear it Dhearn.

Calcat, your right. Static compression stays the same.

I found this tho:

quote:
Aluminum heads dissapate heat faster, so say your motor with iron heads had 10:1 and now with the aluminum heads it has 10:1, since the aluminum heads lose some of the combustion heat it will act like it's running 9:1. So typically when changing from iron heads to aluminum heads you raise the compression .5 to 1 point.

Sorry for the confusion.

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Dustin C
[IMG]http://pages.moparpages.com/duster/sigs/hell_fish.gif[/IMG]
56 F-100
Mech. for wifes 69 Mustang coupe
65 Plymouth Barracuda
70 Dodge Swinger

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