Do you have a burping problem?
 

Do you have a burping problem? I don't mean after drinking a case of fizzy American beer, i mean eliminating air pockets from your engine. I have used a simple mod which works for me, and might be of interest.

My Cobra is self built and has a familiar problem, that is, the radiator is lower than the engine. I had tried all the burping methods available on this forum and others and despite that I still experienced unpredictable temperature changes and sudden coolant losses, which I think were die to air pocket hotspots. I tried filling the engine block through the temperature sender port, but I could not get rid of all the air. I have drilled the thermostat. The design is such that I couldn't add an expansion tank into the top hose which I've seen on other Cobras.

So I added an expansion tank at the back of the engine bay at the highest point available. This provides a header in addition to expansion and has a standard Lever Lock pressure relief radiator cap. I fill the system from here. A hose from the tank goes to the overflow pipe on the radiator fill neck. The radiator is fitted with a non pressure relief cap (available from Summit) which allows free flow through the overflow pipe. I then fitted a standard ball valve (from a plumbers supply) to an unused tapped port on my Edelbrock Performer intake manifold. The port is next to the distributor (see photo).

I can fill the system from the header tank and vent the air through the ball valve. Or, by adding a barbed fitting to the ball valve, I can add coolant through the valve, (using a large funnel on a long tube to provide hydro pressure) and vent through the Lever Lock, in which case the air is forced through the radiator overflow into the header tank.

I have the overflow from the LeverLock connected to an overflow tank as initially I did not know how much coolant expansion and overflow would be involved. After many runs the system has never lost fluid and has never overheated.

have one of these screwed into the top front of the intake. push to bleed off air
Moroso 63765 Moroso Cooling System Air Bleed Valve - Free Shipping on All Orders @ JEGS


http://www.jegs.com/images/photos/700/710/710-63765.jpg

Sounds like a dumb question... BUT.. have you had the front end higher than the back of car? This is how I learned to get the air out of systems over 30 years ago..................
Crack the rad cap......... and run.

To FWB

Yes I tried that and I prefer the ball valve as I can add coolant or vent air

Not a dumb question. Problem is , my rad is so low compared to the engine it's all but impossible to raise the front high enough.

yes most of our cars, the rad is lower than the highest point of the cooling system in the block. the ford purge tank allows for that. or a purge tank of any type mounted as the highest point.

i have a cylindrical purge tank mounted forward, it is the highest point but i still get air trapped in the intake manifold, i installed the little valve and fixed the issue. i fill and top off at my purge tank.