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High Rressure Radiator Caps

Guest RedLineGTR

By Guest RedLineGTR,
in General Automotive Discussion

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Guest RedLineGTR

Guest RedLineGTR

Posted
Posted

Things noticed, that hoses are much more expaned (brand new ones) less fluid in the overflow bottle. Car Seems to take longer to warm up, might be of recent HQ coolant change. Has anyone compaired them to the original ones? Do these high pressure ones add more stress to seals and in future contribute to possible coolant leaks, also maybe water pump seal deteriorate faster, maybe more load for pump...

predator Grand Master

predator

Posted
Posted

I replaced the hose going from my radiator overflow to the overflow bottle with fatter stuff. I've noticed lately that my new hose has resulting in much more overflow to the bottle. This is kinda annoying. Anybody know why?

oh and i painted my radiator cap and the car runs that much more cooler now :D

SLY33 Mentor

SLY33

Posted
Posted

a heavier cap increases the pressure in your system. This actually increases the boiling temperature of the coolant. Eg water boils at 100degrees at 1 atmosphere. The coolant in your system heats up and gets pressurised so that it boils at a higher temp than 100, ie you dont want your coolant to boil as you get steam. Basically i think its supposed to increase the cooling system to operate at a higher temp without blowing its top into the overflow bottle, and as you say, more coolant will remain in the system.

Cubes Grand Master

Cubes

Posted
Posted

If you hammer the car then a high pressure rad cap is recommended as sly33 stated it increases the boiling temperature. Hence it won't boil.

Try well maybe not but if you click your radiator cap so that it is just sitting there and not holding pressure you will notice that going up hills or when flooring it temps will climb.

Cubes Grand Master

Cubes

Posted
Posted

That may be true with a stock motor MotoX however if you are making 300od rwkw then after a hard run the coolant in the head will no doubt begin to boil in parts. This is where the higher pressure cap will help prevent this due to the higher boiling point.

the RB30ET motor has troubles with the coolant boiling in the head so you slap a HD rad cap on and it helps prevent it.

For a stock motor it is hardly worth the trouble and as you said you are better off with a decent coolant.

This is also noticible when you have a thick fmic sitting in front of your radiator.. The radiator has trouble keeping the coolant cool.. Twin 12" thermo's fixed this problem for me however on hot days after driving around and around I still get a few problems.

inark Grand Master

inark

Posted
Posted

there was one on my car when i got it... never really thought it actually did much... i really should top up the coolant... brand recommended? (im guessing those kmart 5litre bottles are a no no?)

Guest RedLineGTR

Guest RedLineGTR

Posted
Posted

havent used any other...first coolant change since i got the car...and whatever crap they filled up in compliance. Just get one that suits you price wise, you usally get what you pay for. Some stuff for like 40buck or a bit less for 5 liters, premade. Redline Oils also have a coolant needs to be mixed with water of some other stuff. Shop around. Your price range.

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