THE RADMAN

iTrader: (2)

what psi pressure cap is best for a stage 3 cossie,alloy tank,rad etc,whats everyone using? seem to be 18-20,21-25,and 25-30 psi,whats a normal ford one rated at?

THE RADMAN

iTrader: (2)

boing

Fiecos Dan

i did same post awhile back mate.

but for my fiecos, and didn't really get any answer,

so i went out and found out myself.

Std ford 17psi, bailey 19psi but is not the same thread, bayonet caps 10-28si.

i went out a brought a pattern part cap, Then pressure tested all my spare caps, and the new one.

3x old ford caps = starts leaking @ 10psi, All leaked on trackdays and top speed runs.
another ford = 13psi, never run on cossie, as found in spares
another ford = 15psi, fitted on my xr2tt
Pattern part Cap = 17psi, Now fitted and done a full trackday at brands, and mega abuse on the road, And Dont Leak at all.


So just fit a new std cap, and it will do you fine as long as engines in good nick.

THE RADMAN

iTrader: (2)

cheers for that,ive got one thats rated at 21--25 just wondering if it would be ok?

Fiecos Dan

yeah should be.

Billabong

Bailey cap is a 'std' Audi part afaik