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ChadS
09-20-2005 10:46:31
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Re: I need more power from my 706 in reply to 706 puller, 09-18-2005 09:35:41
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How many hours are on your engine? If its alot, freshen it up, rebuild it. 70hp isnt bad for a stock 263,,, Cyl head work is critical, port and polish the head and manifold, that will help it breathe alot better. The heads are very restricted on the exhaust ports. Carb work, usually just use the bigget venturi that was used in the IH 6 cyl, which would be a #35, used in the 301, easiest found inthe later IH 715 combines, and rejet the carb to feed it fuel from there. Find a governor off of a Ingersol-Rand Air compressor, that uses the IH C-200 gas 4 cyl engine. They are the lightest weighted governors available for the IH 6's you want rpms, use one of those setups. Those were rated at 3000rpm to start with. They are a single lever governor, in where your 706 will have 2 linkages including the governor spring. You could replace the linkage from the steering column, with a piece of rod, with a heavy spring that attaches directly to the governor arm, that will give you rpm, add a turn buckle to that to make it adjustable, and you can tune your rpms to the range you want. I recently rebuilt my 263 in my 460H,,, the engine was in good shape, being from a combine, so I honed the cyls, rerung it, and new rod bearings, basicly a inframe overhaul,,, I reworked the cyl head, ported, polished the exhaust ports only, the manifold was also matched up to the port work, the Intake ports were left alone, felt they were large enough to feed it, The head was milled .040 to make it true, and to make a little compression increase. Valves were redone as well. I had dynoed this engine before, and after I rebuilt it, and after the head work. Before, it was 70hp,, had 150 psi of compression, on 93 octane pump fuel. After, the engine is 90hp,at 2600 engine rpm and the compression pressure is around 185psi. Still on the same 93 octane fuel. My 263 revs up to about 3500rpm, has room for more, but, its enough. Havent had a chance to run it on the track just yet,, been too busy with other things, but its running good. I also belive that straight pipe exhaust on these engines are a NO NO,,,, they need a little back pressure out the exhaust,,, At least on the gassers,,, JMHO, seems to run alot better with a muffler than a 2-1/2 straight pipe at 36 inches long. Hope this helps,, Chad
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