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F-20 HORSE POWER

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BIG BORE 20

01-06-2008 12:25:27

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Has any one out there had a f-20 with 4" pistons tested on a DYNO. I build one with 4" bore, head milled .050 under, gas manifold, used a f-30 carb. It runs strong, But I have not had it on a DYNO. We had a 400 IH that farmed with and that the old f-20 would pull just as much or more , faster than the 400 would. I would like to know what it,s putting out H.P. wise. It,s alot more than the stock 20 H.P.

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Jeff Bauer

01-08-2008 02:01:10

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Re: F-20 HORSE POWER in reply to BIG BORE 20, 01-06-2008 12:25:27

I don"t have an answer to your question but I was wondering where did you find a set of 4 inch pistons? I would like to get a set for my 20.

Thanks
Jeff

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BIG BORE 20

01-09-2008 09:44:48

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Re: F-20 HORSE POWER in reply to Jeff Bauer, 01-08-2008 02:01:10

I bought them 4" in 1975 at TSC (tractor supply company), sleeves, pistons, and rings $100.00 for a set of 4 back then. You could buy stock 3.75" for $75.00 TSC said the 4" was 6 to 1 comp. ratio, milling my head .050 should have bumped mine to around 7 to 1 Good luck!

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Dave Olson

01-06-2008 20:15:26

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Re: F-20 HORSE POWER in reply to BIG BORE 20, 01-06-2008 12:25:27

I put several of my tractors on the Dyno at the I & I Penfield show last year.

The F-20 did 27 on the belt. It is a '37 and has electric start. I have not done anything to the engine since I have had it.
Link

The H did 34 hp. It is a 1945 war time tractor.
Link

The A did 33 hp. It is a '50. I still have head gasket problems with this one!
Link

The CC did 40 hp. It is a 1938.
Link

The C did the best at 44 hp! It is a 1930 - neat little tractor.
Link

We did not do anything special to any of these tractors before putting them on the Dyno.

I have since purchased a M & W Dyno so now I can put them to work every once in a while when we have time. If any of you guys are in my area and want to put your tractor on a Dyno, let me know. I do not have it set up for running a belt but it can do PTO.

I hope the pictures show up!

Dave Olson - East-Central Illinois

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Dave Olson

01-06-2008 20:21:34

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Re: F-20 HORSE POWER in reply to Dave Olson, 01-06-2008 20:15:26

Sorry the pictures are not displayed!

If you copy past to your browser you will be able to see the tractors belted up to the dyno.

Dave Olson

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Dave Olson

01-06-2008 20:20:28

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Re: F-20 HORSE POWER in reply to Dave Olson, 01-06-2008 20:15:26

Sorry the pictures are displayed!

If you copy past to your browser you will be able to see the tractors belted up to the dyno.

Dave Olson

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SproutW

01-06-2008 15:19:46

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Re: F-20 HORSE POWER in reply to BIG BORE 20, 01-06-2008 12:25:27

I have an F-20 that I'm currently finishing up. Has a complete new rebuild with 4" pistons but nothing else fancy. Be curious myself.

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