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Farmall & IHC Tractors Discussion Forum

300 (Row Crop) M

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big red man

08-27-2018 19:28:20

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I have a Farmall 300. It looks terrible, but I'm loving it! When I looked at specs, It seems very comparable to an M, except a much smaller engine, yet almost the same weight and power. I've been pulling an old Graham Haeme (sp???) chisel. No rain since July 4, so ground is like plowing a concrete parking lot. Most of the time I've been able to pull in third gear, but sometimes in second and occasionally only in first. Daytime temperatures here in south central Texas have been running about 100F. Just happy with my ol 300. kelly

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08-31-2018 09:20:20

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 Re: 300 (Row Crop) M in reply to big red man, 08-27-2018 19:28:20  
They are somewhat comparable until you hit a really hard spot. The 300 will quit on you before the m. My greatest mistake was selling my 300.

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David G

08-28-2018 20:31:47

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 Re: 300 (Row Crop) M in reply to big red man, 08-27-2018 19:28:20  
I would think it would be comparable to an M in HP, but way less torque.

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08-28-2018 10:13:23

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 Re: 300 (Row Crop) M in reply to big red man, 08-27-2018 19:28:20  
Just enjoy the fuel savings of your 300 - that's another area that the M can't compete in.

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08-29-2018 04:37:14

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 Re: 300 (Row Crop) M in reply to dhermesc, 08-28-2018 10:13:23  
The brake specific fuel consumption between an M and 300 are practically identical, Work the 300 like an M and it will burn as much fuel as an M. As loads on gasoline engines get reduced they get real inefficient, efficiency measured in Horsepower Hours per gallon of fuel used. Gasoline engines are most efficient around 80% of full load horsepower. Diesel engines by design burn fuel in direct relation to the amount of horsepower they are making.

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08-29-2018 05:56:16

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 Re: 300 (Row Crop) M in reply to DR. EVIL, 08-29-2018 04:37:14  
The M is extremely inefficient when used for lighter duty work that the 300 excels in - like haying.

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08-29-2018 16:20:23

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 Re: 300 (Row Crop) M in reply to dhermesc, 08-29-2018 05:56:16  
Yes, the H and then the Super H Did all the hay mowing and raking on our farm. The '47 M with the M&W 9-speed got traded for an SM-TA in about 1960, the M with a 9-speed gave an H a run for good fuel economy on light loads if you shifted up and throttled down. Even the Super H with the fast 4th did more raking than a straight H on a gallon of gas.

The 450 gas didn't get a lot of use after cultivating and combining oats mid-summer. 450 pulled the Deere #30 combine, then sat till spring unless we did some fall plowing. Seems like it burned about 4-1/2 gallons an hour plowing and 4 gallons an hour idling.

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08-30-2018 06:16:35

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 Re: 300 (Row Crop) M in reply to DR. EVIL, 08-29-2018 16:20:23  
Even running at higher RPMs (for mowing at 540 PTO speeds) with no "load" to make the governor kick in the Hs, 300s and 350s could run a full day on a single tank of fuel (17 gallon). For a very short time we had an M that was used the same work we did with our H and it seemed to burn twice the fuel. More than once I remember myself or my brothers walking across the field to the pickup hoping the fuel barrel had some gas in it. It been many years but if I recall correctly it was even burning more fuel the 656 that was also on the hay detail. I have never used either tractor for heavy tillage - for us they were for light duty use only by the 1970s.

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08-28-2018 04:33:50

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 Re: 300 (Row Crop) M in reply to big red man, 08-27-2018 19:28:20  
A stock 300 may have given a fresh-off-the-lot bone stock M a run for its money in the day, weighted equally, but most Ms have been overhauled to Farmall 400 specifications since then, or better. Oversized, step-headed pistons increase displacement and compression, bringing the HP up to at least what a 400 was making fresh from the dealer, if not a 450.

300's and 400's came from the dealer already upgraded, so there's very little you can easily/inexpensively do to make more power.

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08-28-2018 04:16:14

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 Re: 300 (Row Crop) M in reply to big red man, 08-27-2018 19:28:20  
Thanks for the replies.
Y’all have given me one of those “aha” moments. 1) An M is more powerful and
2) The reason I like the 300 SO MUCH is because it is so handy like an H,
but an H on steroids. Kelly

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08-28-2018 01:42:44

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 Re: 300 (Row Crop) M in reply to big red man, 08-27-2018 19:28:20  
Looking at tractordata.com, the 300 engine is rated at 1750 rpms while the M engine is rated at 1450 rpms.

"Free" horsepower is available by running the engine faster. Sort of joking but the classic equation is HP = Torque X RPM / 5252 for SAE units.

In broad generalities, engine displacement correlates strongly with torque.

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08-27-2018 21:33:56

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 Re: 300 (Row Crop) M in reply to big red man, 08-27-2018 19:28:20  
From what I understand the 300/350 was the replacement for the H and Super H and the 400 and 450 where the replacements for the M and super M. So a 300 is more like running an H with upgrades in a fast hitch and better hyds

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08-27-2018 20:04:03

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 Re: 300 (Row Crop) M in reply to big red man, 08-27-2018 19:28:20  
An M will be a different class of power. The torque rise and weight of an M would make the 300 seen tiny. The 300 is way beyond an H, but not in the category as an M. Jim

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08-27-2018 21:22:35

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 Re: 300 (Row Crop) M in reply to Janicholson, 08-27-2018 20:04:03  
Yep,a 300 nd n M may be rated the 'same',but in a good hard pull,an M will just walk away from that 300.

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