F1 226 Heat Riser
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From: Tehachapi CA
Thanks to everyone for your input.
I need to take the carburetor off to give it a minor rebuild. When I had it off several months ago, I don't recall seeing the heat riser flap inside the manifold. I will take another look and see if the flap is still there. If it is, I will probably just wire the flap in the open position and hopefully come across the parts I need in the future.
Tom L.
1949 F1
I need to take the carburetor off to give it a minor rebuild. When I had it off several months ago, I don't recall seeing the heat riser flap inside the manifold. I will take another look and see if the flap is still there. If it is, I will probably just wire the flap in the open position and hopefully come across the parts I need in the future.
Tom L.
1949 F1
Cargo Master
Joined: Nov 2014
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The flap is inside the exhaust manifold. You will have to separate the intake from the exhaust manifold to see it. It works by directing hot exhaust gases to the bottom of the intake to increase atomization of fuel on a cold start.
JB
JB
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From: Tehachapi CA
JB,
Gee, I really do feel stupid now. I don't know why I thought I could see the flap by removing the carburetor and looking down the intake manifold. When I looked at the shop manual, the illustration shows the heat source going up to the carburetor. Obviously, now after looking at it again, it is radiant heat that is being depicted. So, with the flap diverting the exhaust heat to the bottom of the intake manifold, that upward heat source atomizes the fuel when cold.
I went out and moved the counter weight from it's default position of 8 o'clock to 1 o'clock. It sounds like there probably still is a flapper inside. When I run the engine, if I bring the weight upward, I can feel a pulsing of the mechanism as if there was something diverting the flow of the exhaust.
I am thinking that it might not be a good idea to try and remove the manifolds at this time. I know from reading on this forum, how rare they have become.
I am going to wire the weight at it's present position of 8 o'clock and go from there. Also, I may put some sealant on the shaft to hopefully stop the exhaust leak there.
Thanks for setting me straight.
Gee, I really do feel stupid now. I don't know why I thought I could see the flap by removing the carburetor and looking down the intake manifold. When I looked at the shop manual, the illustration shows the heat source going up to the carburetor. Obviously, now after looking at it again, it is radiant heat that is being depicted. So, with the flap diverting the exhaust heat to the bottom of the intake manifold, that upward heat source atomizes the fuel when cold.
I went out and moved the counter weight from it's default position of 8 o'clock to 1 o'clock. It sounds like there probably still is a flapper inside. When I run the engine, if I bring the weight upward, I can feel a pulsing of the mechanism as if there was something diverting the flow of the exhaust.
I am thinking that it might not be a good idea to try and remove the manifolds at this time. I know from reading on this forum, how rare they have become.
I am going to wire the weight at it's present position of 8 o'clock and go from there. Also, I may put some sealant on the shaft to hopefully stop the exhaust leak there.
Thanks for setting me straight.
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