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Clooney, one more question, 51 carb

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Ken C.

01-12-2005 17:10:20

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I checked for air leaks and did'nt seem to have any. Working with butterfly now and was wondering about this. On the side of the barrel there are two small holes, one a little bigger than the other, close together. When the butterfly is completely closed should it stop with both holes showing, towards trcactor, or is it to stop right between the holes. I assume the holes are idle circuit holes. If i push a little i can get a .004 gauge between the wall and butterfly, is that to much. Thanks for the help, Ken.

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Clooney

01-12-2005 17:48:23

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Re: Clooney, one more question, 51 carb in reply to Ken C., 01-12-2005 17:10:20

Ken, I can't remember on the 51 if there are 2 or 3 idle holes.. Look to make sure there isn�t a 3rd hole. Is the hole on the bottom of the stem open to feed fuel to the idle circuit?

I don�t know on the .004� as I haven�t ever measured that gap with a gauge.. I just hold them up to the light & look for a large gap of light on the ends. Is there any step wear on the ends of the throttle plate?

Clooney

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Ken C.

01-12-2005 19:55:39

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Re: Clooney, one more question, 51 carb in reply to Clooney , 01-12-2005 17:48:23

I can only find two holes, and they are open, and so is the one on bottom of the stem. The butterfly had some wear on bottom wear it rubbed on the barrel, so i got another plate that was a little to big and sanded down to a tight fit, but i don't remember if it comes back between the two holes or stops before it gets to the holes. Does both holes supply gas at idle, if so i would think it would stop with both open, or both holes between plate and manifold, guess i will try and see what happens. Thanks again, Ken.

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Clooney

01-13-2005 03:09:23

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Re: Clooney, one more question, 51 carb in reply to Ken C., 01-12-2005 19:55:39

Ken, to get an idle at least one hole needs to be on the low pressure side of the throttle plate.. The one on the engine side of the throttle plate (low pressure area) supplies a fuel mixture with a slight amount of air mixed in supplied from the hole that�s outside the throttle plate in the high pressure area.. Then as the throttle plate opens farther the outer hole also moves into the low pressure area & quits supplying air to the mixture & starts supplying fuel also.

Lets make sure we are talking about the correct holes here.. You aren�t working with the economizer holes are you?

I haven't been into a 51 carb in years now & have been into a lot of other DLTX carbs in between so can't remember how many idle holes in the carb bore.. There are also economizer holes on the side there also.

We need to find someone that has been into a 51 recently Maybe Duane Larson or someone else on the board here has???

Clooney

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Duane Larson

01-13-2005 08:52:16

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Re: Clooney, one more question, 51 carb in reply to Clooney, 01-13-2005 03:09:23

The 51 has only the primary and secondary idle holes. It is an all-fuel carburetor with the normal economizer plug system. The gasoline carbs (67,71) have the extra "economizer" holes below the idle holes in lieu of the economizer plug. I agree with your description of the idle hole/throttle plate position/operation. The maximum fuel/air the idle system can provide is with the plate open enough that both the primary and secondary hole are feeding fuel/air. Even idling at wide open throttle the plate is just open adequately to allow both to feed fuel/air - very little if any comes from the nozzle in the load circuit.

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