Rap cap pressure

[Elaine]

Could someone please explain to me why rap caps hold different pressure’s

I am changing my rad tomorrow and have the choice of a 0.9, 1.1 and 1.3 bar rap cap. I would like some info on what there function is and how you determine what pressure to use.

Many thanks E

 

[Adam_Glanza]

basic science elaine,

the more pressure on a liquid the higher the boiling point.

so the higher the rad cap pressure the more the water will take to reach boiling point.

im not really sure wat the best will be, but alota people use 1.3 bar radcaps.

anymore pressure than that and it could be dangerous to the HG

 

[Elaine]

Adam thank you for this just what I needed to know rep added

Thanks again a nice clear answer x

 

[Fishy89GT]

yup what adam has said...my buddyclub one is 1.2 or 1.3 i think

 

[Elaine]

I just got a 1.3bar one from Dave but it does not fit so I have found a 0.9bar one will this be ok untill I get sort something else out??

 

[monka]

elaine what one was it? was a cusco one? i recieved one from a trader (not dave) and it didnt fit, was a cusco one as well

 

[Dave@TM-developments.com]

I just got a 1.3bar one from Dave but it does not fit so I have found a 0.9bar one will this be ok untill I get sort something else out??

Why have you not said so Elaine, is it a type A or B?

 

[Elaine]

Why have you not said so Elaine, is it a type A or B?

Thought I was being dim, untill coolant pissed out all over the bonnet the other night been trying to get a Toyota one but not having any luck.

I dont know what type where would I find out?

 

[Dave@TM-developments.com]

On the packet

 

[Elaine]

On the packet

I dont have it anymore, when it fitted I thought it working so I have not keep the packet.

My fault for assuming it would have just fitted I was in such a rush I should have double checked

 

[dac69er]

new rads have the slightly larger types that the mr2s and celicas have.

0.9 is stock pressure so will be fine

 

[Elaine]

Dave is there a big difference between the A and B??

 

[dac69er]

both types:

http://www.modacar.com/Merchant2/oil_caps/spoon_radiator_caps.jpg

 

[dac69er]

one on the left is stock starlet and possibly glanza. one of the right is what you need

 

[Dave@TM-developments.com]

Do you still have the stock rad Elaine?

 

[weakboy2]

Shes got a glanza rad going in tomorrow

 

[Starlet_Sam]

Dave is there a big difference between the A and B??

One will work for you and one won't!

 

[WillGT]

i use a normal 0.9 cap seems ok didnt know there wer so many different pressure types this is a useful thread!

 

[dac69er]

0.9 is usually stock and 1.3 are the uprated ones. some cars have 1.1 (possibly honda?) as standard and some uprated caps are at 1.1 and even as much as 1.5 ive seen.

alot of bike rad caps are 1.3 bar.

 

[WillGT]

0.9 is usually stock and 1.3 are the uprated ones. some cars have 1.1 (possibly honda?) as standard and some uprated caps are at 1.1 and even as much as 1.5 ive seen.

alot of bike rad caps are 1.3 bar.

ha like i said thats useful this has given me some new knowledge reps added!