High Rressure Radiator Caps

[Guest RedLineGTR]

Just wondering, couple months ago got a new nismo high pressure cap, 1.3kg or something like that compiared to the stock one which is 0.8 or 0.7kg Something likes that. What are the benefits of it and what are the disadvantages of them.

[Guest RedLineGTR]

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...

[Guest RedLineGTR]

Also the high pressure might add extra stress on the radiator, might it induce it to crack sometime?

[Duncan]

Obviously the nismo cap makes the car go faster - you get rice hp!

[Guest RedLineGTR]

nah didnt get it for any rice aspect, some jap details on the back of the packaging "preformance cap" keeps more radiator fluid in the engine so more circles around the radiator and cools it more.

[Duncan]

Well, I just replaced my stock cap with a stock cap since it was $70 cheaper......don't see how that cap can make a significant difference/

[predator]

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

[SLY33]

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]

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.

[MotoX]

unless u do burnouts or, rev the engine extremly hard or run high temps, there isnt much point in having a HP radiator cap, its more wank factor.

you are better of getting decent coolant into your car.

unless u like rice.

[Cubes]

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.

[Guest RedLineGTR]

cool...thanks for all ya help guys, I Still have the radiator cap on NIsmo one, with high quality coolant. Works really well on consistant speeds, keep the coolant more cooler than usual. Dont car about the rice factor..cos there is none..

[inark]

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]

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.

[inark]

yeah i prefer something decent... price isnt too much of an issue.

will see what i can find.

cheers.

[adam 32]

apparently toyota genuine coolant is supposed to be great for aluminium heads - im using it at the moment and it seems good.

pricey though...

[Guest RedLineGTR]

go to this site

http://www.tectaloy.com/

I use the Tectaloy 100plus coolant plus used the muk out product to clean the radiator and coolant system out. Most expensive one i have seen..

[Cubes]

You don't want to mix coolant ppls.. Mixing coolants can cause froth.

[R31Nismoid]

Where can you get these caps ?

I'm gonna be up above 200kw soon... and the car does get a beating at times... if this keeps it cooler i won't complain!

[Cubes]

A few shops online?? Maybe unique?