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Author Topic:   Racing thermostats
Geffy95x
Member
posted September 26, 2002 10:56 PM
I run a racing high flow thermostat and consistantly run between 210 and 225.
If I replace it with a 3/4 inch restrictor ,what difference should I see.
I have a good:
Aluminum racing pump.
Howe 2 core rad.
25 % reduction pulley on crank.
Shroud in front of rad
Four blade steel ford fan 1 inch from rad.
355 12.5 to 1 on gas.


car311
Member
posted September 27, 2002 02:21 PM
the restrictor will help it a few degrees, try some red line water wetter, that is good for a couple degrees too.


HIGHVOLTAGE
Member
posted October 06, 2002 06:29 PM
Geffy our mod was running warm 210 to 240.We tryed everything we could think of short of drilling holes in the front of the car.Come to find out piece we had on front of car to prevent mud from getting all over springs and shocks and front parts was to low blocking all the air from going under car.Took this off now consistitly running 180 with 180 thermostat.


outlawstock17
Member
posted October 07, 2002 06:06 AM
good point 155fan. my engine always runs in the 220+ range. it makes more power in that range.

remember, it takes heat to ignite fuel and the more heat present, the higher the percentage of fuel will be burned, thus more power and efficiency......all this is true up to the point of mechanical failure.

i've also heard this saying: "they go before they blow".

Greggie
Member
posted October 08, 2002 06:50 AM
Geffy, when I was running gas, I was always hot like that. I got to investigating and ran across Kevin Larkins at Knoxville at the Harris Clash that year. He was also running gas at the time. I don't remember if he was running a shroud, but he told me he was running as Stewart pump and no restrictor in the thermostat housing and had just come in from his heat race. I looked at his heat guage and it showed about 180 or so. I had been running a 3/4" restrictor. I went over and changed mine to the biggest one I had (1") and went out and ran 190 - 200 the rest of the season.

You might need to shroud your fan, but Art Jeffries at Racemart tells me that the 4 blade fan will pull more air than a 5 or 6 blade, so you should be fine there. Ken at KRC in Georgia told me that with their experimenting with the belt drives that a gas motor needs to have the water pump turn at 15% of crank speed or faster for it to cool properly. This is what I have done and am now doing. Good luck

Greggie

Geffy95x
Member
posted October 08, 2002 11:41 AM
Was that 15% faster than crank speed Greggie?
Thanks a lot guys for the input.
We bent the nose piece on the car to allow more air through the rad and now we run between 185 and 200 ,it sure is nice not to have to worry too much and concentrate more on driving than watching your water guage.


jammin
Administrator
posted October 09, 2002 10:45 AM
On gas, I have had the best luck running 1 to 1 on the pulleys to pull more air thru the radiator with the fan. This will take a little hp away, but I was running a 406, with a shroud on gas with a 5 blade rigid fan and 1 to 1 pulleys and it would pull the dirt out of the radiator. Never got hot.

Just my 2 cents.

jammin


Geffy95x
Member
posted October 09, 2002 11:19 AM
Next i'll be building a shroud for the inside and that should be the end of the worries for a while .
Thanks guys!!!!


2nd2none
Member
posted October 09, 2002 03:01 PM
how do sprintcars get away with not running fans, their nose's are closed off just like ours and they're not aparently running any hotter than normal.


Greggie
Member
posted October 09, 2002 07:35 PM
Geffy, that is 15% slower than the crank... Sorry I wasn't clear on that one.

2nd2none, I've wondered the same thing about those sprinters, but we burn the same fuel as them, too, and you can really tell by the smell who is on the track. Those things are just a whole different breed. What's funny, is some of them will take the radiator and related components off of the car for their time trials... I saw Joe Gaerte do that at the Nationals a few years ago. I just don't get it!

Greggie

outlawstock17
Member
posted October 10, 2002 08:00 AM
most sprint cars have oil coolers and lots of oil in the dry sump tank. oil helps cool the engine as well as lubricate it.