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Author Topic:   cooling
dirt poor racing
Member
posted January 03, 2004 08:09 PM
what size reducer would you recomend instead of a thermostat in an 302 or should we run a thermostat...


racer17j
Member
posted January 03, 2004 10:31 PM
we alway just take the guts out of the thermostat and use it for a restrictor


redneck racing
Member
posted January 04, 2004 01:17 AM
I do the same as 17j. Eddie


Okie11m
Member
posted January 04, 2004 12:14 PM
Leave it out & run it wide open.


JRB13
Member
posted January 04, 2004 01:05 PM
Get on Stuart Components site. Has a big article on why not to run restrictors.


dirt poor racing
Member
posted January 09, 2004 01:12 PM
thanks for the input...


jay116
Member
posted January 09, 2004 04:57 PM
of course stewart says dont use a restrictor. They want you to buy their thermostat. Lets break it down what does a thermostat do? IT RESTRICTS. The thermostat restricts until it hits its designed temp then opens. Why risk a thermostat getting stuck and and over heating a motor.
I recomend running wide open.

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Jason Boivin
http://www.rcracing-team.com


jeremy5E
Member
posted January 13, 2004 09:26 PM
i think that running a thermostat will makr the engine run hotter because the water isnt being colled long enough, it just keeps flowing, it needs to be stoped to get cooled.


Russell G. Sheehan
Member
posted January 23, 2004 10:48 AM
If your running a stock pump you need some restriction to keep pressure in the head to stop heat pockets from forming. If you run a high flow racing pump you can run with no restrictor and the pump will still keep pressure in the head but you will be flowing alot more water.1 to 1 no restrictor, stewart pump, and a four blade fan seems to be the best combo acording to everything I have read on here. Do a search you will find plenty info on this subject.

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DEANJR#22


racer17j
Member
posted January 24, 2004 10:21 AM
walton hit her right on the head all the no restrictor talk is for the good water pumps a stock pump doesn't create near the flow as them so you need the restrictor to help with the pressure. it's kinda like a pressure washer with the tip and tiny hole in the end it will blow the skin off your hand but take that tip off and it just runs out like tap water you need the restriction for pressure


iowa_dirt_track_girl
Member
posted January 24, 2004 11:25 AM
Water has to be slowed down in the radiator to be cooled point blank now the question how slow do you want it?
A guy that we know personally that does R.R. for Joes Gibbs racing says a good way for you to tell if you cooling system with (and i hope that we all run one if you dont do) a shroud will work is to take the Rad cap off and at 1200 rpms the stream of water that comes out of the cores should have enough pressure and flow to hit the side of the radiator with force and that is with a stock pump.
hope this makes since.

[This message has been edited by iowa_dirt_track_girl (edited January 24, 2004).]

dirt poor racing
Member
posted January 24, 2004 05:09 PM
THANKS FOR INPUT ...AND THE INFO...


20bmw
Member
posted January 25, 2004 06:45 PM
The restrictor is to build the flow pressure in the heads in witch moves the water through the heads faster.. At high rpm`s with no restriction water will boil in the heads causing over heating.

Not just my thoughts but the facts..


waltonjr1
Member
posted January 25, 2004 11:53 PM
quote:
Originally posted by 20bmw:
The restrictor is to build the flow pressure in the heads in witch moves the water through the heads faster.. At high rpm`s with no restriction water will boil in the heads causing over heating.

Not just my thoughts but the facts..


Unless you have a good pump that will create enough pressure w/o resriction.

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DEANJR#22


ratracer10
Member
posted January 26, 2004 08:30 AM
If i remember right from physics heat will transfer the fastest when there is a large difference in temperature. So in order to keep the engine cool you need cooler water or more water flow so that the warmed water is continually pushed out and cooler water is brought in so you can keep the temp difference as great as possible. But then you also need to cool the water, so you need cooler air more air flow or need to hold the water longer to cool it, but if you hold the water longer in the radiator you also hold it in the engine longer so it is not as effecient at removing heat. I think more airflow is the answer, not necessarily through the same radiator even though that will help i think a bigger radiator with more surface area is the answer. It takes heat to make the engine work, more HP generally means more heat so a better cooling system is needed. Since you are limited to what you can do inside the engine i think we need to concentrate on the external stuff like the radiator. Concentrate on getting the best flow through the engine then size the radiator accordingly to keep the engine cool.
Remember also you can overrun a stock water pump because they are designed to run at maybe 4500-5000 max rpm.. above that and they start to become less effecient and dont pump as well due to cavitation and flow decreases.
Anyway thats just the way i look at it...