48 cub timming for more torque

[jsdorn]

I replace the governor in my 48 cub timed the governor installed the magneto.The tractor has great power except when I try to plow.I have no torque .How no I get more torque to plow without the tractor slowing down

 

[Brendon-KS]

Power is torque being delivered at some engine rotational speed. You can't really separate one from the other. If you are saying you have good power but no torque I'm guessing you're lugging the engine down below its power band.

 

[used red MN]

What type of plow are you pulling? Is it something other than the original 12” bottom? Is the timing set per spec to TDC?

 

[BarnyardEngineering]

All you can do is time it by ear for it to run best. Anything either side of that is going to be less power and torque.

There are two things that require all the power the tractor can produce, that's plowing, and running a lawn mower deck. Anything else requires a fraction of the tractor's power. You can not putter around the yard in 1st and 2nd and definitively say the tractor is making good power. It's making good noise, that's about it.

Was it able to pull the plow before you made these changes? If so then something you did when you changed the governor is the problem. Maybe the timing is a little off. Maybe the governor isn't working.

 

[grandpa Love]

.

 

[used red MN]

I believe I texted you a video of how to adjust the timing by ear .........

Why does that make you unhappy?

 

[Charlie M]

Any chance you are wanting more from the little Cub than its capable of delivering?

 

[ADB-Ia]

I replace the governor in my 48 cub timed the governor installed the magneto.The tractor has great power except when I try to plow.I have no torque .How no I get more torque to plow without the tractor slowing down

Too stiff of a governor spring can result in the spring not having enough travel to fully open the governor. The spring needs to be weak enough that it is not fully contracted before the governor fully opens the throttle plate. I had that on a Bosch diesel pump but the same principle would apply to any governor.

 

[buickanddeere]

what is the timing according to a timing light ? Is the governor pulling the throttle plate wide open ?

 

[grandpa Love]

Too stiff of a governor spring can result in the spring not having enough travel to fully open the governor. The spring needs to be weak enough that it is not fully contracted before the governor fully opens the throttle plate. I had that on a Bosch diesel pump but the same principle would apply to any governor.

If the original poster is the person I think it is I sold him the governor and a brand new (correct) spring

 

[grandpa Love]

 

[grandpa Love]

Have you adjusted the rod from the carb to the governor? Does it open the carb all the way?

 

[BarnyardEngineering]

Any chance you are wanting more from the little Cub than its capable of delivering?

Assuming it's the Cub plow, designed for the Cub, the tractor should be able to pull it under most conditions.

It's a magneto so the timing adjustment is very limited. You almost can't have it wrong if the tractor is running.

More questions: Is the tractor running smoothly on all four cylinders? It should sound like a sewing machine, not a Harley Davidson. If it's doing a poppita-poppita thing, it's only running on two cylinders. It's not a John Deere. Very easy to get 2 and 3 backwards.

 

[teddy52food]

Too stiff of a governor spring can result in the spring not having enough travel to fully open the governor. The spring needs to be weak enough that it is not fully contracted before the governor fully opens the throttle plate. I had that on a Bosch diesel pump but the same principle would apply to any governor.

I think you have tghat wrong! The spring opens the throttle & the flyweights try to close it. To ADB

 

[ADB-Ia]

I think you have tghat wrong! The spring opens the throttle & the flyweights try to close it.

You are correct on the spring function, but if the spring is too strong and you set the linkage to hold correct rpm at high idle, when you add load the spring can bottom out (fully contracted) before opening the throttle completely. Result - throttle not fully open under load.

 

[560Dennis]

I suggest putting a vacuum gage on it and measure where you are now . Bench mark Then make changes to see the improvement or not improve . That way your not wasting time and money.
Should be about 18 to 21 inches of mercury on gage steady needle , if not then you need to find out why .
Do compression test record it with warm engine .
Hope this helps together your cub where you want to go with its performance.
Always measure things for improvement

 

[jsdorn]

Any chance you are wanting more from the little Cub than its capable of delivering?

I always had enough power to pull my 12" plow until my governor broke.I just seen vedio on YouTube where the person said he would time the magneto for road driving advance timming and retard the timming for the tractor to work in the field.Is that correct?

 

[wore out]

I always had enough power to pull my 12" plow until my governor broke.I just seen vedio on YouTube where the person said he would time the magneto for road driving advance timming and retard the timming for the tractor to work in the field.Is that correct?

For cranking, the impulse is engaged needs to "trip" at or just after TDC.

Once the engine revs over a couple of hundred RPM's the impulse drops out and the timing is advanced to full running timing of 12 to 16 degrees (13º nominal).

If the impulse is set up properly and working properly the engine should run and perform as designed with that simple initial timing procedure.

 

[rustred]

I always had enough power to pull my 12" plow until my governor broke.I just seen vedio on YouTube where the person said he would time the magneto for road driving advance timming and retard the timming for the tractor to work in the field.Is that correct?

Half of them u tube wanna be’s think they are mechanic’s that can teach other backyard mechanic’s while the mechanic laughs at how stupid they are. Engines have factory spec’s to follow. Sure u can advance the timing a couple degree’s , but geez u got to have a starting point. Set it to spec. Then u get a chizel and put a mark on the mag or dist and housing. Then u do your playing. Plus y don’t need a timing light to correctly set the timing to spec. U can use a test light , piece of paper in-between the points ,or even listen to the spark as the points open. A timing light is good to check the advance. Squatch has u tube stuff on rebuilds and his stuff is done according to the book. Very good video’s .

 

[Janicholson]

Engines certainly get to rated RPM without the throttle plate being fully open. High Idle is maybe 35% open. But if power is required, and the linkage will not allow full opening of the throttle plate in the carb, it will be power limited. I assume the timing is within reason, and the carb is flowing fuel, and the cylinders are all working (compression and firing order correct enough. Jim