Heat riser hose
11-30-21, 11:06 PM
#1
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Heat riser hose
Any idea where I could obtain a heat riser hose for my SA? When cold the idle is rough, I feel the heat riser would help a lot getting warm air into the carb until it shuts off with the little flap. I have looked everywhere and the part is NLA but I'm sure they sell generic hoses.
12-01-21, 08:50 PM
#3
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Frogman (12-01-21)
12-02-21, 01:19 PM
#6
It's a tube about a foot long and 2" diameter that connects the air intake via a round port under the air horn to cowling around the exhaust manifold.
There's a bimetalic coil that opens a flap in the air horn when cold, so that warm air is delivered directly from the top of the exhaust manifold into the carb when the engine is cold. When it warms up, the flap closes and you get cold air into the carb.
Looks like this:
There's a bimetalic coil that opens a flap in the air horn when cold, so that warm air is delivered directly from the top of the exhaust manifold into the carb when the engine is cold. When it warms up, the flap closes and you get cold air into the carb.
Looks like this:
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gracer7-rx7 (12-05-21)
12-02-21, 08:17 PM
#9
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12-03-21, 07:05 AM
#11
The tube won't make any difference for a cold start, but very quickly the exhaust manifold will get hot, delivering hot air into the carb.
Thus the carb will warm up a lot faster, reducing emissions and increasing fuel economy.
It's a good idea, especially in cold climates.
Thus the carb will warm up a lot faster, reducing emissions and increasing fuel economy.
It's a good idea, especially in cold climates.
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