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Tractor Pulling Discussion Forum

Farmall m - whats up?

Author  [Modern View]
north puller

11-17-2012 10:06:03
74.198.9.100



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atached is a graph showing the pto torque curve of 2 farmall super m motors. The bottom is a pure stock, somewhat worn out 264 inch super m. The top is a somewhat built up 281 inch motor with higher compression and a cam.

Can anyone tell me why the torque takes a dive the way it does in the circled area? What might be going on here?

The tractors were dynoed on the same dyno, the same day. A M&W slide chart was used to calculate HP, then the HP and PTO speed were used to calculate torque.

I dynoed 3 other tractors that day, (not farmalls)and no other tractor experienced this dive in torque at 400-450 pto rpm which makes me think that it is nothing to do with the dyno.

Any idea what might be going on with these super m motors?

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MLPANKEY

11-19-2012 11:25:58
152.85.8.33



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 Re: Farmall m - whats up? in reply to Mandm56082, 11-17-2012 10:06:03  
Quoting Removed, click Modern View to see True I would have thought that would be ruled in or out by the dyno not being able to pull engine rpms down.



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Dodgeit

11-19-2012 10:56:51
65.199.61.227



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 Re: Farmall m - whats up? in reply to nl00sb, 11-17-2012 10:06:03  
Quoting Removed, click Modern View to see

Although it could be a timing issue. I have seen simalar results when a clutch is slipping. Especially since you mention pulling the throttle open from partial. My guess is clutch slipping.



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MLPANKEY

11-19-2012 10:31:27
152.85.8.33



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 Re: Farmall m - whats up? in reply to nl00sb, 11-17-2012 10:06:03  
Quoting Removed, click Modern View to see I wish it was that easy . A cam with a duration of 200 @50 should be maxed out by 3000 or a tic above when put in straight up but rod length etc is variables that change (general)characteristics .



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MLPANKEY

11-18-2012 18:08:30
98.68.198.242



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 Re: Farmall m - whats up? in reply to G3400, 11-17-2012 10:06:03  
main thing is cams advanced to much. distributor needs advanced lockout and timed for initial timming . my two cents



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north puller

11-19-2012 05:42:25
68.171.231.82



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 Re: Farmall m - whats up? in reply to MLPANKEY, 11-18-2012 18:08:30  
How may motor rpm's will the tq curve shift with 1 deg change in cam timming?



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Cliff S

11-18-2012 09:32:53
64.136.26.151



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 Re: Farmall m - whats up? in reply to north puller, 11-17-2012 10:06:03  
My SMTA would Change like that too But it was the time the Gov Opened up all the way!

I Changed the Gov Spring to a Stiffer One and it Helped make the Gov Smoove Out and Gained about 2 Hp at 540 on the pto!

Cliff S



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north puller

11-18-2012 16:00:14
68.171.231.81



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 Re: Farmall m - whats up? in reply to Cliff S, 11-18-2012 09:32:53  
It is not the gov. For the sake of the dyno test, the 281 had a very stiff spring. Likely would give 2500 rpm or higher. I loaded the motor up at part throttle, then opened the throttle up all the way. I then baked off the dyno till rpm's cam up to 700 pto. I didn't want to let it go any higher and didn't feel the need as I run slower than that at a pull. The gov was for sure wide open all the way.

The dist in this tractor has a 40 deg plate in it - could it be something to do with ignition timing and a change in the advance at that rpm? Would a dist with a 30 deg or 25 deg plate be a better choice?

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high octane

11-18-2012 17:49:54
72.53.194.237



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 Re: Farmall m - whats up? in reply to north puller, 11-18-2012 16:00:14  
north, use stiff advance springs, or lock it up all together like a mag. itll help.



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Cliff S

11-18-2012 17:25:22
75.97.93.246



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 Re: Farmall m - whats up? in reply to north puller, 11-18-2012 16:00:14  
The More Compression the Less timing advance to Loug well!

I would Try a Distubitor with Less Advance and make Shure it works Smoove on the Advance and not hanging up!

Cliff S



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Roger in Iowa

11-17-2012 18:44:55
166.182.3.45



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 Re: Farmall m - whats up? in reply to north puller, 11-17-2012 10:06:03  
Sticky advance mechanism in distributor?



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johns

11-17-2012 18:28:36
69.163.7.60



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 Re: Farmall m - whats up? in reply to north puller, 11-17-2012 10:06:03  
I think the cam has the biggest effect on the torque curve and where it climbs and drops. Surprising it is in about the same range on both tractors.



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Ed Carlsen

11-17-2012 13:39:39
67.142.130.25



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 Re: Farmall m - whats up? in reply to north puller, 11-17-2012 10:06:03  
Just a thought carbs on farmalls frosting or was the same fuel used in the farmall tractors (high octain?)not enough compression to burn that fuel?



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Aaron SEIA

11-17-2012 13:00:50
208.126.88.85



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 Re: Farmall m - whats up? in reply to north puller, 11-17-2012 10:06:03  
Just my SWAG but is it the way the Farmall gov is working?

AaronSEIA



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