It's the same concept as the exhaust brake on a diesel. It's great for warming up my Cummins (EGTs of 400+* when choked off at idle vs 275* when open), but it's primary purpose is to make backpressure to slow the engine. Would IH's engineering have used it for warming the intake and the fuel/air flowing through it AND for the back pressure to have higher compression when the exhaust valve closed that would raise the pressure in the cylinder for the next combustion stroke to aid in burning the distillate? I know it wouldn't be much volume for a higher pressure (only that between the piston and the cavity of the head), but it's some.
And (I hope I'm not whipping this to death) . . . A diesel will gobble all the air it can get, so an exhaust brake would be the only throttle in the system. It can't block the exhaust completely, obviously (like a potoato in the pipe!) but it closes off a large part of teh diameter of teh exhaust. And it's a lot more effective as a brake at higher RPMs. With the heat selector on the tractor motor set for operation in the cold (as closed as it will get) and the motor at working speed (throttle plate wide open) I can see it working fine. But as the throttle plate closes down to idle, I see a no-man's land developing between the throttle and the heat-control flapper. Am I correct that that is part of the reason for the difference between a gas (idle mixture and speed adjustments only) and a distillate (with the additional adjustment for the load mixture) carb? Ported differently as well? I would also think that the heat-control flapper would be much less restrictive, relatively smaller than an exhaust brake plate?
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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