Coolant Cap question

Draven · Post by **Draven** » Mon Nov 28, 2011 3:25 pm

So as people may or may not have guessed I am overhauling my cooling system. I'm wondering what difference having a say 1.3 bar coolant cap would make in comparison to the standard 0.8 bar one.

Obviously I realise that it does and the reason for it but i'm just wondering what difference it makes

??

Slarty · Post by **Slarty** » Mon Nov 28, 2011 4:15 pm

At normal (atmospheric) pressure water boils at 100 degrees C. If you increase the pressure you increase the boiling point.

pta · Post by **pta** » Sun May 27, 2012 9:18 pm

I was told that REV5 has 1.1 bar radiator cap. What would be the spare part number for it?

My MR2 boils when I shut it down even if I let it idle and cool down before turning it off. Cooling system is bled so I thought to buy a new radiator cap...

4ndee · Post by **4ndee** » Sun May 27, 2012 9:44 pm

Mine boils after shut down and I have a 1.3 bar trd cap

toxo · Post by **toxo** » Mon May 28, 2012 4:55 pm

Obviously increasing the pressure the radiator cap opens at increases the pressure your cooling system is being held to, so you'd be putting an extra .5 BAR into a 20yr old radiator/heater pipes/HFH...

MR2 Rich · Post by **MR2 Rich** » Tue May 29, 2012 9:07 pm

Where's the best place to get a standard 0.9 bar cap? Camskill do them for 5 quid but if genuine Toyota ones aren't much more I will get one of those instead.

JohnnyC · Post by **JohnnyC** » Tue May 29, 2012 9:25 pm

Genuine Toyota ones are around £13-£15, and they *usually* have to be ordered in (2 days).

Glenn_k · Post by **Glenn_k** » Fri Jun 01, 2012 9:20 am

I suffered from slight overheating on the track including my overflow tank squirting coolant onto my electrical components. As a solution, I mounted a higher pressure radiator cap and that solved it.
The stock system can handle 1.3 bar with ease, as long as you take care of it and make sure all the hoses and clamps are in good order.

riot68 · Post by **riot68** » Sat Jun 02, 2012 9:46 am

Please excuse my ignorance, I'm confused, mine has a TRD 1.3 cap on it, are you saying just changing this is putting my cooling system under more strain than the stock cap?...

toxo · Post by **toxo** » Sat Jun 02, 2012 10:33 am

riot68 wrote:Please excuse my ignorance, I'm confused, mine has a TRD 1.3 cap on it, are you saying just changing this is putting my cooling system under more strain than the stock cap?...

Basically, yes. The pressure in the system has to reach a higher level before the cap opens, so every joint, the radiator etc are all subjected to this higher pressure.

Magic Beans · Post by **Magic Beans** » Sat Jun 02, 2012 10:34 am

riot68 wrote:Please excuse my ignorance, I'm confused, mine has a TRD 1.3 cap on it, are you saying just changing this is putting my cooling system under more strain than the stock cap?...

Swapsies?

I've got a stock cap and need a TRD

riot68 · Post by **riot68** » Sat Jun 02, 2012 12:05 pm

Magic Beans wrote:
riot68 wrote:Please excuse my ignorance, I'm confused, mine has a TRD 1.3 cap on it, are you saying just changing this is putting my cooling system under more strain than the stock cap?...

Swapsies? I've got a stock cap and need a TRD

I have a stock cap somewhere too in my big left over bit's box

Dunno what to do really...

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