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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Super 55 motor versus 550 motor

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EB...

05-18-2008 22:58:31




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I'm about to start a complete rebuild of my Super 55 gas motor. I was wondering what are the internal differances between the 550 motor and the super 55? Cylinder head, vavle size, borestroke, cam ETC. I'm considering upgrading the super 55 motor with 550 parts to gain the extra HP




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J Schwiebert

05-19-2008 09:55:07




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 Re: Super 55 motor versus 550 motor in reply to EB..., 05-18-2008 22:58:31  
Correct on head, valves,bore manifold, carburetor venturi size air cleaner and all that other good stuff except cam and crank. I would go 3-5/8 bore. Do you know a good machine shop. They could port out the valve size if you want to go that route.



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EB...

05-19-2008 12:40:59




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 Re: Super 55 motor versus 550 motor in reply to J Schwiebert, 05-19-2008 09:55:07  
I don't know any good machine shops but MaiBack tractor is only 25 miles from me so I'm sure they could provide me with one. I've never had this kind machine work done before so if you had to guess how much would this cost me using a Super 55 head? Do you know the carb makemodel # or is it the same carb with a bigger jetbore? As fare as the intakeexhaust manifold goes I would also assume that's a replacement part, is there a part # or model # I should be looking for?

Thanks
Eric

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Tramway Guy

05-20-2008 14:16:49




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 Re: Super 55 motor versus 550 motor in reply to EB..., 05-19-2008 12:40:59  
The S55 and early 550's used Marvel Schebler TSX603, the later ones used TSX775 or TSX811.
The 603 was a smaller carb, with smaller bore, and a different mounting bolt pattern. The hose and air cleaner were different also.
But I am sure that a lot of these tractors have had the larger bore kit installed with changing all the accessories.



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J Schwiebert

05-19-2008 09:54:39




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 Re: Super 55 motor versus 550 motor in reply to EB..., 05-18-2008 22:58:31  
Correct on head, valves,bore manifold, carburetor centur size air cleaner and all that other good stuff except cam and crank. I would go 3-5/8 bore. Do you know a good machine shop. They could port out the valve size if you want to go that route.



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Tramway Guy

05-19-2008 05:01:23




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 Re: Super 55 motor versus 550 motor in reply to EB..., 05-18-2008 22:58:31  
The Bore size went to 3-5/8" in the 550 at Serial number 72832, a couple of hundred tractors into the 1959 model year.
The camshaft and crankshaft were the same.
A larger carburetor and different intake manifold were installed at the same serial number. Don"t know if you need those to make all the extra power or not.



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EB...

05-18-2008 23:28:23




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 Re: Super 55 motor versus 550 motor in reply to EB..., 05-18-2008 22:58:31  
Without looking I would assume the 550 has a bigger bore but is the crank or rods any different?



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djm75

05-18-2008 23:22:22




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 Re: Super 55 motor versus 550 motor in reply to EB..., 05-18-2008 22:58:31  
the only difference I know of is in the 550"s the increased the displacement not sure of when or the serial # but I can check if it makes any difference to you. Don



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Matt Kane

05-20-2008 17:30:31




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 Re: Super 55 motor versus 550 motor in reply to djm75, 05-18-2008 23:22:22  
I have a 3 3/4 overbore piston and sleeve set in mine. Its a diesel and its what I had to rebuild it. I probably have some gain in HP with mine, but I really couldn't tell you. Its a later 550 engine in my 55. I would probably stick with the 3 5/8 if you could.



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