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Old 10-13-2019, 07:17 PM   #1
chorusguy
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Monojet governor question

Hi all. 1972 292 in line 6. Manual 4 speed with granny gear, manual choke.

Monojet needs a rebuild. When I was looking for the number, I realized it has some type of governor underneath it. So governor is between carb and manifold. What does this do? Is it necessary?

This is in a step van. Is it like a speed limiter that they use on school busus.

Any info is greatly appreciated.

Robert Cox
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Old 10-13-2019, 07:29 PM   #2
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Re: Monojet governor question

A pic would be nice!
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Old 10-13-2019, 07:34 PM   #3
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Re: Monojet governor question

I know. Was racing the sunset. Will post one tomorrow.


Thanks
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Old 10-13-2019, 07:48 PM   #4
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Re: Monojet governor question

We'll know when we see the pic. However, this type of vehicle was used extensively, industrially, just like big trucks. They have governors to keep the yahoos driving them from over-revving them. If you are not a yahoo and don't over-rev your engine, you could probably take it off without a problem. Take a close look, though, to see what might end up interfering when the carburetor is closer to the manifold.
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Old 10-13-2019, 08:25 PM   #5
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Re: Monojet governor question

Thanks. Long term, I need to determine if this truck will make highway speed. It's not quite roadworthy yet, so have never actually driven it on the road. Knowing whether the governor limits the speed will help fill in the blanks. If it doesnt, then the next step,gulp, will be investigating a different gear ratio on the rear end.

Stay tuned.

Robert
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Old 10-13-2019, 10:00 PM   #6
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Re: Monojet governor question

You'll want to look into a more-ratio (5- or 6-speed) transmission if you go to taller rear gears. Getting it off the line with that taller rear will be tougher. I'm not sure you want to get a tip over prone box up to too much speed, either. But maybe your cojones are bigger than mine!
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Old 10-13-2019, 11:58 PM   #7
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Re: Monojet governor question

https://www.youtube.com/watch?v=ls0cukBH6sY

https://www.youtube.com/watch?v=_4wbA_NCDcU
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Old 10-14-2019, 11:00 AM   #8
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Re: Monojet governor question

Ive driven them up & down the highway 60-65 mph all day long. That 292 is almost indestructible. A higher gear would be real good though. It probably has 4:11 gears now. 3:73 is available for that rear end. It is a comparitivly easy rear end to work on.
George
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Old 10-14-2019, 11:29 AM   #9
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Re: Monojet governor question

I just installed a 292 in my truck in place of the 250. It I believe came from a bigger truck and may have been a replacement engine. I say this because of the fact that the pad by the dist. has no numbers/letters at all and it also had a governor on it. After being rebuilt, I installed the intake and exhaust manifolds from the 250 on the 292, mainly because the carb was completely rebuilt and the manifold bolts had all been replaced. Have not fired her up yet, but I don't anticipate any problems with it. I did have to find a different PS assembly for it as the 250 was different.
I don't see any reason you couldn't use the original carb, just get a couple of shorter bolts for it. Linkage should not be a problem.

Last edited by old51sedan; 10-14-2019 at 11:32 AM. Reason: more information
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Old 10-14-2019, 12:09 PM   #10
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Re: Monojet governor question

The easiest way to do that governor is to take the butterfly valve out of it. If it is working ok I would leave it alone. It might save your engine if the throttle stuck open. They do cause carb iceing in cold damp weather but that is rare.
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Old 10-14-2019, 01:44 PM   #11
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Re: Monojet governor question

Quote:
Originally Posted by old51sedan View Post
I just installed a 292 in my truck in place of the 250. It I believe came from a bigger truck and may have been a replacement engine. I say this because of the fact that the pad by the dist. has no numbers/letters at all and it also had a governor on it. After being rebuilt, I installed the intake and exhaust manifolds from the 250 on the 292, mainly because the carb was completely rebuilt and the manifold bolts had all been replaced. Have not fired her up yet, but I don't anticipate any problems with it. I did have to find a different PS assembly for it as the 250 was different.
I don't see any reason you couldn't use the original carb, just get a couple of shorter bolts for it. Linkage should not be a problem.
In your case, the extra 40 cubes might mean a different carburetor calibration, like the jet and metering rod. Not that familiar with Monojets, but GM made dozens of differently calibrated carburetors.
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Old 10-14-2019, 04:49 PM   #12
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Re: Monojet governor question

As promised photos
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Old 10-14-2019, 04:54 PM   #13
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Re: Monojet governor question

Pics 1,3&4 should be rotated clockwise 1/4 turn. Dont know how to fix that.

Robert
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