Pressure In Radiator

[lovelessnator]

I installed a alloy radiator into my 33 a few days ago but when the car is dead cold an hasn't been drivin I can take the radiator cap off an about 50ml of water will shoot out! This never happened with the standard radiator in it.

So why is there so much pressure? I thought if there was pressure it would excape out the over flow bottle.

[mad082]

for the coolant to escape out the overflow it has to overcome the pressure of the cap, which is about 0.9bar from memory.

[lovelessnator]

The radiator came with a new cap rated at 1.1 bar so I'm assuming this is why there is the extra pressure? So this is all normal in other words?

[StevenCJR31]

i reckon you have the wrong radiator cap on it

[mad082]

i'd check to see what the stock pressure should be for your car. i was only guessing at the pressure, but running a cap with a higher pressure than stock is a bad thing in my opinion. it puts extra pressure on the rest of the cooling system and will make other things more prone to failure.