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Old 02-26-2003, 11:23 PM   #1
PhillyScott
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Default STi High Pressure Radiator Cap

Can anyone explain to me the advantages of installing a 1.3 bar STi High Pressure Radiator Cap?

Thanks,
_Scott
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Old 02-27-2003, 09:44 PM   #2
richeich
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I'm curious about this as well. Anybody have any experience or knowledge about it?

Rich
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Old 02-27-2003, 11:49 PM   #3
DoorKnob
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Simple, higher pressure let's the water carry more heat before it boils. Normally, at 1 bar, pure water boils at 100C. When you increase the pressure, it takes more than 100 to boil the water. Now the coolant in your car isn't exactly pure water, but the concept is the same.
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Old 02-28-2003, 12:30 AM   #4
cvalle-sd
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cooler engine, and all that goes with it...
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Old 02-28-2003, 12:34 AM   #5
Simon Quezada
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But if you just change the cap your presure won't go up will it.

I mean it just means that the cap will take 1.3 right?
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Old 02-28-2003, 01:35 AM   #6
mycarsux
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do u have to upgrade ur cooling system?? say like hoses or the radiator?? or can u just put it on a stock system?
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Old 02-28-2003, 04:35 AM   #7
spiralsmurf
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anybody want to order some? i can get them in a week or so for pretty cheap.
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Old 02-28-2003, 11:58 AM   #8
HndaTch627
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careful, the radiator tank prolly won't hold the increased pressure
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Old 02-28-2003, 09:41 PM   #9
Sunrise City Rider
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The higher pressure will keep the cap closed for longer allowing the water to continue circulating thru the engine instead of overflowing into the coolant reservoir...This is necessary for endurance racing and prolonged driving on a long road trip...It is good to keep water moving instead of just dumping it in the reservoir...Your radiator's tanks should hold the extra pressure without any problems...

Zee
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Old 03-01-2003, 03:48 AM   #10
HndaTch627
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Quote:
Originally posted by Sunrise City Rider
The higher pressure will keep the cap closed for longer allowing the water to continue circulating thru the engine instead of overflowing into the coolant reservoir...This is necessary for endurance racing and prolonged driving on a long road trip...It is good to keep water moving instead of just dumping it in the reservoir...Your radiator's tanks should hold the extra pressure without any problems...

Zee
tell that to the WRX owners.

and on long trips?? you realise that at crusing speed the CFM moving thru your radiator is so insane that the cooling fans themselves would never keep up with it. it has nothing to do with keeping the coolant in the tank, it's about raising the boiling point of the coolant/water mix by applying more pressure to it. the problem is if the radiator tank can hold it it will split. your coolant is always moving back and forth between the resivoir and the radiator.

jeremy
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Old 03-01-2003, 05:59 AM   #11
PhillyScott
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So is there any harm installing the STi "high pressure cap"?

_Scott
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