radiator cap pressure

C

canadian

Newbie
May 16, 2006
366
0
0
Victoria BC
Does anyone know off hand the pressure capacity of the stock supra radiator cap? I think it's around 16 PSI? I want to upgrade to a slightly higher capacity for a higher coolant boiling point...
 
S

souprat

New Member
Mar 30, 2005
649
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38
fairfax VA
went into the garage and had a look. 88Kpa which is how the civilized part of teh world says 12.76psi. it says right under all that kanji on teh rad cap. i hope all your rad hoses and lines are new because with the higher pressure you will certanly find out which hose is weaker.
 
C

canadian

Newbie
May 16, 2006
366
0
0
Victoria BC
souprat said:
went into the garage and had a look. 88Kpa which is how the civilized part of teh world says 12.76psi. it says right under all that kanji on teh rad cap. i hope all your rad hoses and lines are new because with the higher pressure you will certanly find out which hose is weaker.
Click to expand...

Okay, lower than I remembered...

all the hoses will be replaced with higher pressure hoses.

Thanks for the help.
 
ross1

ross1

New Member
Jul 14, 2005
188
0
0
45
va
souprat said:
went into the garage and had a look. 88Kpa which is how the civilized part of teh world says 12.76psi. it says right under all that kanji on teh rad cap. i hope all your rad hoses and lines are new because with the higher pressure you will certanly find out which hose is weaker.
Click to expand...


thats true, when i got my pwr it came with a 16lbs cap and i ended up blowing 4 hoses, three by the tb and the water -> turbo line, those ones under the tb are quite the bitch to get to too...

ross
 
K

koulee

New Member
Oct 11, 2005
497
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0
0.9 bars! You are definitely gonna blow something at 16 lbs. You ever take a look at the upper radiator hose after you turn off the engine. Its like a water balloon getting ready to pop.

Why would you want to run higher than stock radiator cap pressure? You got twin turbos in that thing or something?
 
Jason T

Jason T

JZS161 Aristo TT
Mar 30, 2005
98
0
0
53
Auckland New Zealand..Aotearoa
Blatant copy and paste from http://www.absoluteradiator.com/Accessories.asp
It has become popular to install high pressure radiator caps in an attempt to lower cooling system temps. ...
....Before increasing your cooling system pressure by replacing your radiator cap with a higher rated radiator cap, check to make sure your entire cooling system is in excellent condition and all of the components are capable of handling these higher pressures. These may components include, but are not limited to:

The radiator (all of the All-Aluminum radiators that we sell are rated to handle these higher pressures)
Radiator hoses
Heater hoses
The heater core
The water pump
Freeze plugs
All gaskets that come in contact with the cooling system
Increasing your cooling system pressure by installing a radiator cap that has a pressure rating higher than factory specs increases stress on the entire system. Although some race cars use high pressure caps, their cooling systems are built to handle these higher pressures (All-Aluminum brazed and welded radiators, steel braided hoses, no heater core, high performance water pump, high performance gaskets, etc). We offer high pressure caps because some cars are designed with high pressure cooling systems. We recommend that you only use a cap with the pressure rating that your car was designed for.
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Cliff notes for those with short term memory issues

High presure caps blow heater core/hose's/gaskets any weak point will be found.
 
ross1

ross1

New Member
Jul 14, 2005
188
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45
va
koulee said:
0.9 bars! You are definitely gonna blow something at 16 lbs. You ever take a look at the upper radiator hose after you turn off the engine. Its like a water balloon getting ready to pop.

Why would you want to run higher than stock radiator cap pressure? You got twin turbos in that thing or something?
Click to expand...


nope thats just wat it came with and a regular cap doesn't fit far enough down into the fill neck to seal. after replacing hoses there havent' been any problems so far.

ross
 
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