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Farmall & IHC Tractors Discussion Forum
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Opinions needed - Farmall 300

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Mac AR

09-21-2016 18:32:04




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I'm curious about different ways adding a little power to my 300. Its got the 350 kit in it now, with fire craters, carb jets were bored out a little, l.p. manifold and I think an l.p. head. Its turning stock rpms, but I wonder if I could turn it up around 2000 rpm? I think 300 utilities run the same motor at 2200 rpms, am I wrong. Will this make my engine into a grenade? Its in good shape now, so I don't want to damage it. I appreciate any input.
Mac

P.S.- she dynos around 41 horses now. Not looking for much, just need a little extra umph on the hills

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BarnyardEngineering

09-22-2016 04:48:56




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 Re: Opinions needed - Farmall 300 in reply to Mac AR, 09-21-2016 18:32:04  
You can run the engine at a higher RPM, but unless you re-gear the transmission to take advantage of the higher RPM (or run smaller diameter tires), you really don't gain anything.

It takes a certain power to run a certain implement at a certain ground speed. By running at a higher RPM, the tractor moves at a faster ground speed, which requires more power.
When the additional power gained from the higher RPM isn't enough to compensate for the higher ground speed, the engine will lug down. End result the engine lugs back down to where it was running before you futzed with the governor.

Since it's not practical to re-gear the tractor in most cases, the only way to take advantage of the additional power is to run a gear slower, which generally means you are moving slower than you were before you futzed with the governor, and not getting as much work done... UNLESS you then invest in a larger implement. The whole thing is kind of a catch-22.

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D Slater

09-22-2016 04:02:27




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 Re: Opinions needed - Farmall 300 in reply to Mac AR, 09-21-2016 18:32:04  
Not meant to ruffle feathers but it's common for the term get a 350 or 450 cam to be used. Two camshaft types were used in those tractors. One just like the 300 and 400 and at serial number breaks a different suffix cam that had left hand cam gear retaining nut with threads. Discounting used condition the only difference in the cams is the threads. Both have the same lift and valve timing. Running the same setup as you have with gas head, gas manifold like most 350 used and RPM raised. Not a puller just a user. Tried a few different things and found a original jetted supper M carburetor works pretty good for a little extra at high RPM and still lugs pretty good. Engine doesn't seem to like a lot of time for power and running 25 to 27 degrees BTDC at max advance with a 50 50 mix of regular and premium gas. Sometimes the SM carb is just at the point of being lean, at least the ones I tried and may need made just a little richer. If not sure on the head, look on this site for a picture of a 450 LP head. Find 450 parts, then engine parts. 300 LP head should look the way picture does above the intake and exhaust runners.

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Janicholson

09-21-2016 18:45:35




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 Re: Opinions needed - Farmall 300 in reply to Mac AR, 09-21-2016 18:32:04  
Running 2200 is OK. Putting electronic ignition in it and making sure it advances correctly is a good step. a 350 cam is also realistic. Jim



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John M

09-22-2016 03:29:35




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 Re: Opinions needed - Farmall 300 in reply to Janicholson, 09-21-2016 18:45:35  
300 and 350 cam are showing as the same part number, so unless the 300 cam used a different cam originally, the cams are the same.



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D Slater

09-22-2016 10:25:15




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 Re: Opinions needed - Farmall 300 in reply to John M, 09-22-2016 03:29:35  
third party image

John the last camshaft IH made to use in H to 350 engines ended up being listed as the same number in parts books after that. More information.



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John M

09-22-2016 11:25:03




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 Re: Opinions needed - Farmall 300 in reply to D Slater, 09-22-2016 10:25:15  
Right, but did they not share the same part number originally? I think it ended in 222 or 227, jus ta different R number, but the cams were identical in lift and duration? Or am I thinking of something else?



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D Slater

09-22-2016 18:12:18




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 Re: Opinions needed - Farmall 300 in reply to John M, 09-22-2016 11:25:03  
May not have stated it to well, but in my first post was trying to say I agree other than the camshaft threads the cams were the same. Left hand and right hand threads were used in 350 and 450 tractors. Right hand thread ones in a 350 are the same number as a 300 originally. Oldest H parts book I have dated 9-39 lists cam 49900DAX. 300 parts book before they included 350 in the same book lists 49900DCX, that's a right hand thread cam. Last cam used in C175 engine number 9607 and up is 49900DDX. Can't remember the other number seen. IH used other suppliers with different number on the part than listed in parts book sometimes. DC and DD cams have the same specs other than threads. Latest parts listing IH put out would list 49900DDX in H, SH, 300, 4 series and 350 tractor parts book.

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John M

09-23-2016 03:05:20




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 Re: Opinions needed - Farmall 300 in reply to D Slater, 09-22-2016 18:12:18  
My eyes are playing tricks on me. I see now what youre saying.



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D Slater

09-25-2016 19:05:31




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 Re: Opinions needed - Farmall 300 in reply to John M, 09-23-2016 03:05:20  
John you were right about a 2. Looked at a spare 4 series cam today with number 45982DC. 45982 is the number not in parts books I couldn't think of in other post. 6 series cams other number is 45955D. For some time I thought maybe none of the cams had a book part number until I finally run across a few.



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Mac AR

09-21-2016 19:05:15




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 Re: Opinions needed - Farmall 300 in reply to Janicholson, 09-21-2016 18:45:35  
Thanks Jim. What is the best way to measure rpm without having a tach in the distributor. Mine never had one put in. I'm looking at an electronic ignition, but that's gonna have to be my Christmas present to myself. Hadn't thought of the 350 cam, either.

Thanks again,
Mac



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Janicholson

09-21-2016 19:50:33




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 Re: Opinions needed - Farmall 300 in reply to Mac AR, 09-21-2016 19:05:15  
There are inexpensive strobe flash tachs. that work. Shaft tachs on the PTO, calculated from the posted 540 Shaft speed and original engine speed can be determined. Jim



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Mac AR

09-21-2016 19:53:51




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 Re: Opinions needed - Farmall 300 in reply to Janicholson, 09-21-2016 19:50:33  
Thanks Jim. If I had one of those could I leave the cover off the gov housing and tweak it, or will I have oil everywhere. I know that sounds silly but I've never run one with the cover off.
Mac.



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FastFarmall

09-21-2016 20:10:27




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 Re: Opinions needed - Farmall 300 in reply to Mac AR, 09-21-2016 19:53:51  
But whats the point of haveing the governor cover off, too speed it up some,I wouldn't leave it off !!



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Mac AR

09-22-2016 06:11:39




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 Re: Opinions needed - Farmall 300 in reply to FastFarmall, 09-21-2016 20:10:27  
Not meaning to leave it off, just take it off and leave it off long enough to futz with the governor. I also don't quite understand the statement about gearing. I'm not necessarily trying for more draw bar horses, but I do need a couple more for the PTO. Especially on my brush mower. But, if you all think that this won't help, there's no sense in fooling with it. Sounds like I'd get about as much gain with the EI unit installed and properly advanced. I guess I can weigh my options and play with it over the winter.

Mac

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