Unpressurized cooling system for high hp race cars?
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Unpressurized cooling system for high hp race cars?
I was talking to Dan @ Wolfe Racecraft, and he mentioned that in their drag radial car (twin turbos) that they run a gutted radiator cap, so that they end up running an unpressurized cooling system.
Can we do that with LSx cars too? Thoughts?
Can we do that with LSx cars too? Thoughts?
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Originally Posted by Pro Stock John
Alex = huh?
Horrible attempt to be funny after a long weekend.
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Originally Posted by Phil99vette
Water does boil @ 212 but what kind of water temp do most of plan on seeing? My car is going to run 180-185 and should never see over 200. Definitely a good idea.
Phil
Phil
I bet you will see 200 if you drive it.
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I used to run gutted caps on N20 motors that never had a water pressurizing problem from combustion leaking in the passages, mainly to keep the water out of the motor in case I torched a gasket. What exactly would not running any pressure help in an engine that pressurizes the water on a pass, either way it gets blown into the overflow, with no pressure I would just assume more water would get blown out. Some pressure is useful for keeping air out if anything.
#13
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If you had enough reservoir to keep the water in the system contained, and temps low enough that the water would never boil...I guess no reason why not.
But whats the point ? If you are having to resort to that, there is obviously a major problem.
it would be easier to run a conventional pressurised system, albeit with plenty of reservoir also to contain water, plus an effective catch/overflow just in case.
Ultimately, if its going to go bang...it wont make a difference what cap is on it.
But whats the point ? If you are having to resort to that, there is obviously a major problem.
it would be easier to run a conventional pressurised system, albeit with plenty of reservoir also to contain water, plus an effective catch/overflow just in case.
Ultimately, if its going to go bang...it wont make a difference what cap is on it.
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This was some info from someone who works on a 7.5 drag radial car, so I figured it was worth discussing.
I'm sure some hard core racers also probably run overflows that can hold 2 quarts to a gallon.
I'm sure some hard core racers also probably run overflows that can hold 2 quarts to a gallon.
#17
Yes, in a street car, road race car… pressure is there to raise the boiling temp, but the fact that everyone is missing is that the pressure in the cooling system, especially in a drag setup that should never get nearly hot enough that raising the temp is an issue is also there to prevent or at least control localized hot spots/boiling off and air pockets…
Even at the same running temperature, the lower pressure setup will be more likely to have hot pockets in the heads with steam in them which will make that engine much more susceptible to detonation and other heat related issues.
Even at the same running temperature, the lower pressure setup will be more likely to have hot pockets in the heads with steam in them which will make that engine much more susceptible to detonation and other heat related issues.
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One thing that doesn't seem to be taken into account is that water boils at 212*. If you guys are running anything else in there (antifreeze, water wetter, etc) that could change... in either direction, I don't know.
Just thought I'd throw that out there.
Just thought I'd throw that out there.