Fast Idle ?

Nate V. IA · Mar 26, 2011

What does the term fast idle mean, I see it used alot. Same as high idle? Full throttle no load?
Nate

Janicholson · Mar 26, 2011

It has no real context for tractors (older). It does apply to cars and trucks with chokes (both automatic, and manual) with throttle positioning cams. It also is programmed into many Fuel Injection systems. Usual application is to aid warm up, and prevent stalling when cold.
If used to describe High Idle (as you described) it is not really correct. Jim

rustyfarmall · Mar 26, 2011

(quoted from post at 14:14:50 03/26/11) It has no real context for tractors (older). It does apply to cars and trucks with chokes (both automatic, and manual) with throttle positioning cams. It also is programmed into many Fuel Injection systems. Usual application is to aid warm up, and prevent stalling when cold.
If used to describe High Idle (as you described) it is not really correct. Jim

I have to disagree. High idle on a governed engine, such as in a tractor, does mean wide open throttle, no load.

rustred · Mar 26, 2011

high idle would be the same as full throttle no load. the engine governed load rpm would would be slightly less than no load rpm. refering to tractors here. the fast idle term is vehicle related as jim pointed out.

Janicholson · Mar 26, 2011

With respect I didn't indicate that High Idle was not used on tractors, I indicated that fast idle was not. Jim

Nate V. IA · Mar 26, 2011

That clears it up, I have been using the high idle term in context to manual chokes and such on pickups. I'll use the appropriate terms from now on.
Thanks
Nate

CNKS · Mar 26, 2011

Jim, for the purposes of this forum that is a little too technical. My H and M manuals, and probably my C and SA manuals (which are out in my shop) use the term fast idle for adjusting the main jet on the carburator.

GordoSD · Mar 26, 2011

Just use "Balls to the Wall" "WOT" or "floor it". All old timers know those. LOL

Nate V. IA · Mar 27, 2011

My favorite is "pour the cobs to it," not exactly sure where that reference is from, but I like it.

sflem849 · Mar 27, 2011

Jim may be getting "too technical" but there is a difference and that should be noted. He is an engineer. He can't ignore differences like that.

WY JERRY · Mar 27, 2011

I think thats "pour the coals to it", meaning feed more fuel to a boiler in times of high demand for a steam engine (when coal was used for fuel).

pete 23 · Mar 27, 2011

It's kind of like throttle it up which does not make sense to me. I always throttle it down. Like some one has his hands around your throat and throttling you. I rev her up, open her up, give her the gas or something like that when increasing the engine speed. I'm a high idle man myself also in reference to max speed no load.

LA in WI · Mar 27, 2011

Nate,
Being an Iowa boy you should know what "pour the cobs to it" means, unless you are younger than 50.
Way back when...most Iowa farmers had plenty of corn cobs after shelling corn, so the wives would use them for heat in the big kitchen cook stove instead of "high-priced coal". Corn cobs gave off lots of heat, I remember seeing them in the stove gleaming red.
LA in WI

Fast Idle ?

Nate V. IA

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Janicholson

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rustyfarmall

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rustred

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Janicholson

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Nate V. IA

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CNKS

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GordoSD

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Nate V. IA

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