- Apr 10, 2002
how much pressure is the rad cap in the 1g turbo talon supposed to hold?
Newlogics said:Also, water has lower boiling point, and based on personal experience, when it gets very hot and water boils, it cool much worse then water/coolant mixture.
Actually water boils at 212F. When mixing it with a 15psi cap and 50/50 it raises the boiling point to 265F. 70/30 raises the boiling point to 276F What helps raise the boiling point is the pressure of the system (like a pressure cooker) in addition to Antifreeze mixture.guitarXgeek said:Actually water has a higher boiling point than antifreeze, which is why a mixture of slightly more water (like 60/40 water/antifreeze) helps a bit in cooling. Water has a higher boiling point than antifreeze, and the antifreeze has a lower freezing point (the name should have been obvious) than water. Therefore a nice 50/50 mixture protects the motor from getting too hot or freezing in hot or cold climates. Makes sense, eh?
Under moderate load conditions, each percent glycol raises cylinder head temperatures by 1°F. 50% glycol raises head temperatures by 45°F.
i dont have a overflow bottle right now (its just a hose), but a cold motor shouldn't be dumping water should it?
How do you testing the radiator pressure? I haven't seen any tool around that test radiator.
Any decent shop will have a cooling system pressure tester. The kit runs around $100. Pump it up to 12psi, check it after fifteen minutes. Look for the leak. Fix leak, or pour in can of Barr's and sell.
What are those good for anyway?
So, I’m trying to avoid the Facebook black hole. I’m running a race only car so I run a higher pressure cap... there is a lot of misconception in here. Maybe it’s cause the thread is 10 years old. Haha.
First of all a higher pressure coolant system WILL increase the cooling ability of the system by making vapour pockets in the cylinder head smaller which increases water contact with the casting. If you are making more than factory hp I would absolutely be running at least a 16psi cap. This may not apply if you have crappy hoses or a clapped out factory rad. 20psi should be fine with good hoses and clamps on an aluminum radiator. I am currently running 20psi and I’m going to try to go higher than that. I may end up needing AN fittings to keep things together.
Anyway, long story short, higher pressure is better in a lot of ways. Make sure your system is in good shape and pressure test it and absolutely run a 16psi cap. 13 is a joke.
Holly old thread revival. Actually thanks for that cause I got an email reminder and I brought me back on here. Haven't been on this site for probably 7+ years. But as far as the pressure cap thing, yes run at least a 16psi cap. I ran a 19psi cap for several years without any issue. Only reason I stepped up from the stock one was the car would push coolant into the overflow when idling after a pull at the drag strip or when pulling into the pits at an autocross or at Gingerman race track. I had to keep the idle up after a hard run for a few minutes with the stock cap. The higher pressure cap solved that issue. Which btw the issue started when I had to switch to a single slimline fan, didn't happen when I was running the old stock dual fans.