Re: My H is Cold Natured!

Posted by captaink on March 28, 2005 at 08:14:59 from (66.115.214.56):

In Reply to: My H is Cold Natured! posted by Tanner Clark on March 28, 2005 at 07:35:11:

If once the engine reaches operating temperature, (180 degrees or more) it runs fine, you don’t have a problem. However if after warming up it still acts up, then you have some kind of fuel restriction.

The colder the temperature the less gasoline vaporizes, the less effectively it vaporizes the less thoroughly it mixes with air, thus the less explosive it is under compression. It takes a higher ratio of gasoline to air to start a cold engine than to keep a warmed up engine running. Carbureted gasoline engines need to have the air flow restricted for cold (here cold means anything below operating temperature) starts because of the need for the higher fuel to air ratio.

This is why the choke plate in carburetors was invented. On my M there is a spring loaded “flipper” in the choke that opens up a bit as soon as the engine fires up. This is to prevent a severe overload of fuel and consequent flooding of the engine if the full choke was left on after it was running. This was an important feature when you were hand cranking it. Depending on the engine and carburetor settings it may take several minutes of operation before the engine will operate smoothly with the choke completely open. The colder the weather, the longer you will need to choke the engine.

I have seen others say that H's don't like a lot of choke for starting, maybe so. I can tell you that my M at 80 degrees F will pop right off, with just a quick feather choke and in a few seconds run fine. At -20 F I have to pull the choke and when it fires up, I wait several seconds before I can even begin to open it up or the engine will starve for fuel. As I said earlier, different engines respond differently, but the principals are still the same.

Hope this helps clarify.

Follow Ups:

• Re: My H is Cold Natured! Dixieland 08:28:18 03/28/05 (0)

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