Hey All, This is not Model T but it stays in the family.
I am looking for someone to help me with a 1946 Lincoln V 12.
The car is running great. When hot it is just very hard to start sometime we need to leave it cool down for a wile and than it start up on the first kick.
Checked already the choke and the carburetor float for overflow but couldn't find anything.
The car stood in a barn for a few years. During the winter we get it out under the moth balls. Drained all the fluids and cleaned out the gas tank, gas lines and carburetor. New spark plugs, contact points and capacitors are installed.
New oil in engine, gearbox en rear axle. Drained the brake fluid and overhauled the brakes and cleaned the car, no paint job. We are willing to keep it in the state we found it.
Now after a few rides it is just hard to start it up when hot.
I think it's a vapor lock problem. Old flatheads gets hot and boil the fuel out of the fuel line. You can try the strange clothespin trick - it's cheap & easy. Put a few clothespins on the fuel line where it's close to hot areas like the engine and the exhaust. They may increase turbulence in the air flow and thus help cooling?
If that's not enough an electric fuel pump back by the tank may be the next fastest/easiest solution.
See this discussion at another forum: http://www.jalopyjournal.com/forum/threads/problems-vapor-locking-the-closepin-t heory.178217/
are you sure you have a good spark? flick the points with screw driver with coil wire off the
cap held close to a ground. good spark then
dump some gas down its throat. If it tries then its
fuel. Next how hot is hot?
edit: oh I forgot about the coil (being down there)
then pull a plug wire. I bet its a yellow spark.
Under normal circumstances, an engine creates the most heat right after it is shut down. This is because the water pump and fan are no longer working. Your engine has just switched from liquid-cooling to air-cooling (and anyone who has ever worked in the engine room of a diesel submarine knows this principle all too well). When that happens, a car engine's radiant heat is trapped where it can cook the fuel lines and bubble-boil the gasoline to the point of vapor-lock.
Give this a try: When you park your car with the intent of returning and restarting the engine before it can cool down, leave the hood open. This way, the engine's heat will just naturally rise up out of the engine compartment instead of being trapped in there.
Yesterday we tried a few of your ideas.
It was 28°C here in Belgium, during the test drive, the Lincoln nearly cooked over and was close to overheating. I made a closer inspection of the cooling system. With a digital temperature meter. I found some spots in the radiator core were hot other were cold. We took the radiator out and send it to be rebuild.
I think this will help with start problem when hot.
Thanks for your help.
Opening the hood after a hot drive helped to get is stated easier.