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Farmall & IHC Tractors Discussion Forum
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C-123 HP Question

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Bill in NC

11-03-2004 05:48:50




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Yesterday somebody posted a link to Old Oak Farmalls that gives Nebraska Test Data. It shows the C-123 in the 1958 Farmall 140 with 23.02 HP at 1400 RPM and the C-123 in the 1958 Farmall 240 with 30.99 HP at 2000 RPM.

Different carburator? Different Cam? Anyone bumped a C-123 up to 2000 RPM? How is it done? I have a 1959 140 and don't plan on making any changes as I am happy with the stock set-up, but am curious about IH having two RPM ranges with the same engine.

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Bus Driver

11-03-2004 10:23:05




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 Re: C-123 HP Question in reply to Bill in NC, 11-03-2004 05:48:50  
I do not have parts catalogs for all the tractors mentioned, but have searched the catalogs I do have for other tractors that used the basic engine block for different aplications with different HP and different operating speeds. I every case, I found that the camshaft was different. The cam does help determine at what speed the maximum torque is developed. Simply raising the RPM may result in only an increase of travel speed at light loads. Case in point, once I frequently drove two different buses supposedly identical to each other. Diesel engines, original RPM max at 2800. Someone had set one of them at about 3200 RPM and on level ground, it would go faster than the other. On steeper hills, each would pull up at the same RPM and speed. The new higher RPM did not change the torque curve of the engine.

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Bill in NC

11-03-2004 08:47:37




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 Re: C-123 HP Question in reply to Bill in NC, 11-03-2004 05:48:50  
Before this thread goes stale, here's some other questions regarding IH's 140 and 240 tractor HP ratings:
1) 2000 RPM = 30.99 HP, 1400 RPM = 23.02 HP. This implies the C-123 was "de-rated" to 23 HP for the 140 by restricting the RPM.
2) Anyone have an idea as to what the 140 gearbox can handle re: max HP? What gearbox does the 240 use?



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Brown Dirt Cowboy

11-03-2004 10:03:32




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 Re: C-123 HP Question in reply to Bill in NC, 11-03-2004 08:47:37  
Bill in NC I pull a 1945 B Farmall that I had bored to take the31/4" piston and sleeve and turned up the RPM's to 2000 and put it on dyno and an getting 33HP out of it, have been pulling it like this for 6 yrs now with no problems at all, got a rearend for a B incase I needed any parts but so far have not taken anything off of it. You got to know that when they hook up setups using multi-engine configurations like the pullers were doing several years back using F-20 and M's and 44 Massey rearends these gears had to be tough.Tom

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Red Dave

11-03-2004 07:03:38




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 Re: C-123 HP Question in reply to Bill in NC, 11-03-2004 05:48:50  
I think it's mostly done in the governor. Changing flyball weights and/or springs in the governor will do it. Maybe a different carburator sometimes too.

Fairly common for IH and others to rate the same engine differently by changing the RPM.

Tractor pullers commonly up the RPM's to get more horses. Makes you wonder how some of these old engines stay together turning twice what they were designed for.

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Bill in NC

11-03-2004 07:48:23




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 Re: C-123 HP Question in reply to Red Dave, 11-03-2004 07:03:38  
Red Dave,
I worked for a farmer in the mid-1960's that had a Farmall 100 that would fly! I was about thirteen years old and did not know much about engines. Like you said, I bet that 100 had a modified governor. His son was a mechanic and street raced from time to time. I remember one time when the farmer made me walk over the tire marks to show me where the right rear tire was just before leaving the ground (tractor about to flip over). Now 52 and shudder when I think how many hours I spent on those offset Farmalls driving like a bat going back and forth between the barn and tobacco field.

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Ramon from NC

11-03-2004 09:30:32




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 Re: C-123 HP Question in reply to Bill in NC, 11-03-2004 07:48:23  
Bill in NC, I am from Durham, NC, where are you from (just out of curiousity. I have a Farmall 100 and when I eventually rebuild the engine, I asked the same question you did. Check out the email thread...
Link

Bottom line was the most folks thought the crankshaft would be the first point of failure in upping the RPM. Best bet for increased HP would be fire crater pistons.

Cheers Ramon

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Bill in NC

11-03-2004 10:18:49




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 Re: C-123 HP Question in reply to Ramon from NC, 11-03-2004 09:30:32  
Ramon,
I'm in Asheboro, but grew up down East in Wilson County. There's a Farmall restorer in your backyard just off Alston Road in Durham. His name is Greg Jenkins and I was at his place about a month ago. He and his dad have H's, M's, 350, 230, Super A, 140's and two rare lever controlled tractors with air cooled motors (I can't remember the name, but I think the tractor was made in Colorado).

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Ramon from NC

11-04-2004 09:18:23




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 Re: C-123 HP Question in reply to Bill in NC, 11-03-2004 10:18:49  
Bill, Sure, I met Greg Jenkins and his father. They do really nice work on restorations. He has some really neat tractors there. That 230 they have is really nice and Greg takes a lot of pride in it. I didn't see their rare air cooled motor tractors, maybe I'll have to drop by again sometime. If you are ever in the area again, let me know. I am about 20 minutes north of Greg on the other side of Durham.

Cheers Ramon

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Ramon from NC

11-03-2004 09:47:07




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 Re: C-123 HP Question:Another thread in reply to Ramon from NC, 11-03-2004 09:30:32  
Link



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