Pro Stock John

iTrader: (34)

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?

onfire

iTrader: (17)

Water boils at lower temps at lower pressures.....

Frost

iTrader: (45)

water boils at 212F against atmosphere

ALLBOTTLE

iTrader: (13)

Maybe the pressure in the system is provided the turbos. lol

Pro Stock John

iTrader: (34)

Alex = huh?

ALLBOTTLE

iTrader: (13)

Pushing water and pressuring the coolant system via the head gasket.

Horrible attempt to be funny after a long weekend.

Pro Stock John

iTrader: (34)

No soup for you!

By gutted I mean taking the rubber gasket out of the cap.

Phil99vette

iTrader: (11)

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

NA$TY-TA

iTrader: (21)

Thats got me thinking Phil.......

Kyle

LASTLS1

iTrader: (7)

I bet you will see 200 if you drive it.

Cmarsh

What about using the gutted cap along with something that raises he boiling temp of the water, like the redline water wetter.

kp

iTrader: (34)

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.

stevieturbo

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.

Pro Stock John

iTrader: (34)

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.

Phil99vette

iTrader: (11)

Actually John, its 7.40s but whats a tenth at that level....****, a tenth at that level makes you not legal to run at any track with a 25.2 chassis.

MIGHTYMOUSE

iTrader: (59)

it wold make me feel more comfortable about not blowing out the plastic end tanks on my radiator.. other than that.. no gain.

Silverback

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.

gnx7

iTrader: (28)

Evans NPG coolant runs at zero pressure. The liquid is more viscuous and pulls heat out from the heads/block better than other coolants.

Pro Stock John

iTrader: (34)

I'm pretty sure my car will be over 200F at the end of the quarter mile.

Gauge

iTrader: (3)

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.