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What should the radiator cap pressure rating be on my 289? My cap now is 13 lbs and I don't think that it is enough, my car is dripping water when it isn't even very hot.

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Brian
66 coupe
 

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it normal to drip/blow/hiss/spray, etc. Make sure H20 level is one inch below the top of the radiator.

I put a 16lb on mine and it did help a bit - only in that it took 10 minutes of idle versus 3 minutes in TXheat before it would spray.Keep in mind that the higher the pressure, the higher the temperature the rad fluid will operate. Kind of a viscious circle.

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66 vert, 5.0L custom roller motor
99 Expedition
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It may say 13# but not be venting at 13#.

Or

The radiator may just be too full! Let it belch for several days driving,..sometimes it'll find it's own level.

Or

It may not be full at all...you may have some trapped air that is expanding and pushing out some water localized near the radiator cap (in effect too full)

Did ya know you can by an exact reproduction cap for your car that will look much nicer that the aftermaket auto parts special and work just as well for about the same money?

Call Max Kozlowski at AMK products,...(918) 455-2651 to get one.

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i put an overflow container on there and everything is fine and dandy. for now its just a cheapo autozone universal piece of plastic, but it works. i plan on getting a better one later but its hard for me to spend 80 bucks on something to catch my water.
 

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I use 16 lb. caps on my D-coder and race car for a similar reason...
The higher pressure and commensurate higher potential operating temperature capability give me an extra margin of control on really hot days on the street and at the track....

The D-coder still has the stock 2-row radiator and the race car has a radiator/oil cooler out of a Mazda RX7......

I just like the idea that the temp can go to 215 without losing control of the coolant....the engine can survive those brief excursions as long as the lube temps stay under control....

Nothing makes a hot day go south quicker than puking coolant into the overflow and then all over the ground....

For that reason, I have the overflow tank on the race car in the trunk behind the rear tires....

Pat
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