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Posted by D Sherman [72.47.9.228] on Tuesday, September 27, 2011 at 13:44:12 :
In Reply to: As I sit here, Heat Riser ?? posted by The Dodge Boys [64.121.152.7] on Tuesday, September 27, 2011 at 09:42:28 :
Some of my rigs have the manual adjustment too. I learned about it when my Tucker Sno-Cat iced up on its first major trip and I found the heat riser set to "Summer". Why would anyone set the heat riser on a Sno-Cat to "Summer"? It had been that way so long that it was not only rusted in place but all the space between the heat riser and carburetor base were completely filled with carbon, which meant even less heat getting to the carb. I think the main problem with the manual heat riser is that if you don't move it now and then, it gets stuck, and then you have to pull the whole manifold assembly and take everything apart to fix it.
So, to make it easier to adjust, and to ensure that it doesn't stay in one place very long, what about rigging a cable like a throttle or choke cable from the heat riser adjuster to inside the cab? Then you could do things like start with max heat, and then cut back to no heat when pulling a long hill in near-freezing weather, and then on the downgrade give it a little more heat to keep it from icing up. Seems like it should make for a more efficient easier-running setup. Don't airplanes have a manual "carb heat" control for use in icing conditions? It'd be one more control to futz with, but I like manual controls. If it was up to me, I'd have a manual timing adjustment lever in the cab too.
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