Re: Engine pans


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Posted by Ron Becker on Jul. 03, 2009 at 08:43:47

In Reply to: Engine pans
posted by Dick Brussee on Jul. 02, 2009 at 04:29:13

Engine Splash Pans and Vapor Lock; An opinion

I drove my Model `A’ Town Sedan for many years without any problems and then I had a need to remove the Engine Splash Pan. While off the car, I drove to the MARC National Meet in Cincinnati, OH and started experiencing Vapor Lock. This started a study to determine the cause and resolution of Vapor Lock. It was frustrating.

Years later at the MARC National Meet in Green Bay there was a seminar “On the Road Issue” which had a large attendance. The seminar had a panel of 6 to 8 knowledgeable Model `A’ owners. One of the questions was Vapor Lock causes. One of the panel members started the answer with a question. “Who in the audience has experienced Vapor Lock” and approximately 100 hands went up. “Of those who raised their hands, who has experienced Vapor Lock and do not have Engine Splash Pans on there cars. And, again about 100 hands went up. The third question was, “Of those who have raised their hand experiencing Vapor Lock, have Engine Splash Pan on their car. About 5 hands went up. The panel member then asked, “Is there any further questions regarding the potential of reducing Vapor Lock.”

Upon my return from Greene Bay, the Pans were installed and I have not experienced Vapor Lock.

The theory is that without Engine Splash Pans, the cooler air passing through the Radiator drops immediately and passes out of the engine compartment around the front of the engine and onto the road. With Engine Splash Pans, the cooler air passing through the Radiator passes over and around the Engine to the Fire Wall, circulates around and then drops out the back of the Engine Pans onto the road.

Keep in mind that the hottest section of the Model `A’ Engine is the rear of the engine where the water jacket is the thinnest thus passing less water around the back of the engine. Water will take the path of lease residence. In addition, the gas line from the Sediment Bulb leaves the Bulb going to the front of the engine, but high in the compartment and to the rear of the engine, and then curves downward passing by the Exhaust Manifold, taking another curve to the Carburetor.

My plan, with the assistance of a friend, is to mount two thermocouples on the car with meters. One will be mounted on the gas line just below the curve after the Sediment Bulb, and the second somewhere on the car to measure the temperature of the day. The test will be conducted with and without the Engine Splash Pans mounted and many trips on hot days.



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