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Author Topic:   Radiator caps and Thermostats
Kyle
Gearhead

Posts: 293
From: Sumner, WA
Registered: Dec 2001

posted 04-17-2003 08:54 PM     Click Here to See the Profile for Kyle   Click Here to Email Kyle     Edit/Delete Message   Reply w/Quote
What pressure cap do you run in your race car? Do you use a thermostat or not? Is your car driven on the street?

I'm buying a Griffen radiator to replace the stock one in my Fairlane (which is track only) to hopefully get the temp down. My cooling system will consist of the Griffen radiator, ___psi radiator cap, 16" electric cooling fan, Moroso electric water pump drive w/ larger drive gear, stock water pump, maybe water restrictors or T-stat. I want to be able to hot lap this year if I need to.

And does putting a plate on the back of the water pump impellers really work?

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Kyle Laramore

63 Fairlane: 302, Victor Jr. heads and intake, solid lift cam, super comp headers, MSD 6al and duraspark, 650 DP carb, C4 w/ Hughes converter, man. valve body

66 Mustang coupe: 289, offy intake, Holley 600 vac. sec., long tube headers, 3spd stick

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Dave_C
Gearhead

Posts: 788
From: Gadsden, Al
Registered: Aug 99

posted 04-17-2003 09:16 PM     Click Here to See the Profile for Dave_C   Click Here to Email Dave_C     Edit/Delete Message   Reply w/Quote
My 557 is on alcohol, so cooling is not an issue. When I had my 69 Mustang bracket car(sold it last fall) the cooling system was simple, but effective. It could go rounds with minimal cooldown, even with a .060 over 383W.

I had a homemade water restrictor. I used a cutoff wheel and gutted a stock thermostat. I cut the center section and spring out. Left the outside edge. The center hole was about 1" diameter vs 1 3/4 w/o a stat. Also had:
Afco 26X19 universal aluminum radiator.
The radiator cap was a regular stant. 16-18 lbs I think.
Auto Zone hi-po aluminum water pump (exact copy of Milodon aluminum pump)I also bought one of those $5 Flow Cooler disks and riveted to the water pump impeller. Seemed to help.
Moroso electric pump drive with std pulley.
Perma Cool 14" electric fan.
I also made a bracket to hold the trans cooler out away from the radiator by about 2 1/2", rather than right up against it so the air could circulate.

Later,

David Cole

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Moneymaker
Administrator

Posts: 21725
From: Lyons, IL, USA
Registered: May 99

posted 04-17-2003 09:17 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
8# cap and no thermostat ever.
We do use a restrictor with a 3/4 inch hole in all the race cars.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

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clevelandstyle
Gearhead

Posts: 800
From: Connersville, IN
Registered: Jul 2001

posted 04-18-2003 12:15 AM     Click Here to See the Profile for clevelandstyle     Edit/Delete Message   Reply w/Quote
I did like DaveC and gutted a stat. If you run a working thermostat with an electric water pump, it won't circulate coolant when the stat is shut. You need a gutted stat or a restrictor.

------------------
Ben
Grabber Green '70 Mach I 351C 4V
Robbin Egg Blue '79 Fairmont 351C 4V

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Ryan Wilke
Gearhead

Posts: 1700
From: Stanton, Michigan 49707
Registered: Oct 2000

posted 04-18-2003 09:59 AM     Click Here to See the Profile for Ryan Wilke   Click Here to Email Ryan Wilke     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by clevelandstyle:
.....If you run a working thermostat with an electric water pump, it won't circulate coolant when the stat is shut.

Doesn't some coolant circulate thru the bypass hose when the thermostat is closed?

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Dave_C
Gearhead

Posts: 788
From: Gadsden, Al
Registered: Aug 99

posted 04-18-2003 10:22 AM     Click Here to See the Profile for Dave_C   Click Here to Email Dave_C     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Ryan Wilke:
Doesn't some coolant circulate thru the bypass hose when the thermostat is closed?

The bypass hose takes the water from the intake, diverts it to the water pump and back into the block. It never goes into the radiator since the thermostat blocks the upper radiator hose. You might get a very little water flow into the rad with a stat if the stat has an air bleed hole in it.

BTW, on a car with no thermostat I block off the bypass. That way it forces all the water to go into the radiator. With the bypass in place prob 20% of th ewater flow goes right back into the block instead of the radiator.

Later,

David Cole

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65Restomod.com
Journeyman

Posts: 43
From: Spring, TX United States
Registered: Apr 2002

posted 04-18-2003 12:42 PM     Click Here to See the Profile for 65Restomod.com   Click Here to Email 65Restomod.com     Edit/Delete Message   Reply w/Quote
Alex,
Would use do that same thing (8# and 3/4 restriction) for a street strip car, or strictly for race applications?
Thanks,
Jeff

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http://65Restomod.com

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