Monojet governor question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chorusguy · 10-13-2019, 07:17 PM

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

geezer#99 · 10-13-2019, 07:29 PM

A pic would be nice!

chorusguy · 10-13-2019, 07:34 PM

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

Thanks

**Steeveedee** · 10-13-2019, 07:48 PM

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.

chorusguy · 10-13-2019, 08:25 PM

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

**Steeveedee** · 10-13-2019, 10:00 PM

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!

Astro-Balls · 10-13-2019, 11:58 PM

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

https://www.youtube.com/watch?v=_4wbA_NCDcU

Wrenchbender Ret · 10-14-2019, 11:00 AM

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

old51sedan · 10-14-2019, 11:29 AM

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.

Wrenchbender Ret · 10-14-2019, 12:09 PM

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.
George

**Steeveedee** · 10-14-2019, 01:44 PM

Quote:

Originally Posted by old51sedan

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.

chorusguy · 10-14-2019, 04:49 PM

As promised photos

chorusguy · 10-14-2019, 04:54 PM

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

Robert

10-13-2019, 07:17 PM	#1
chorusguy Registered User Join Date: Aug 2017 Location: Sanford, nc Posts: 7	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

10-13-2019, 07:29 PM	#2
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,712	Re: Monojet governor question A pic would be nice!

10-13-2019, 07:34 PM	#3
chorusguy Registered User Join Date: Aug 2017 Location: Sanford, nc Posts: 7	Re: Monojet governor question I know. Was racing the sunset. Will post one tomorrow. Thanks

10-13-2019, 07:48 PM	#4
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,596	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. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

10-13-2019, 08:25 PM	#5
chorusguy Registered User Join Date: Aug 2017 Location: Sanford, nc Posts: 7	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

10-13-2019, 10:00 PM	#6
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,596	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! __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

10-13-2019, 11:58 PM	#7
Astro-Balls Registered User Join Date: Feb 2019 Location: Nor Cal Posts: 822	Re: Monojet governor question https://www.youtube.com/watch?v=ls0cukBH6sY https://www.youtube.com/watch?v=_4wbA_NCDcU __________________ 1968 C20 Fleetside 396 4sp PS PB AC CST . https://www.youtube.com/watch?v=RWK8GgWD4uA

10-14-2019, 11:00 AM	#8
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,228	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

10-14-2019, 11:29 AM	#9
old51sedan Registered User Join Date: Oct 2015 Location: Williamston, Mi Posts: 884	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

10-14-2019, 12:09 PM	#10
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,228	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. George

10-14-2019, 04:49 PM	#12
chorusguy Registered User Join Date: Aug 2017 Location: Sanford, nc Posts: 7	Re: Monojet governor question As promised photos Attached Images

10-14-2019, 04:54 PM	#13
chorusguy Registered User Join Date: Aug 2017 Location: Sanford, nc Posts: 7	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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