Posted by Janicholson on January 06, 2015 at 18:54:32 from (74.60.94.18):
In Reply to: Farmall H motor rebuild posted by 1945FarmallH on January 06, 2015 at 18:43:29:
Though controversial, there is no real way that the issue is real. Radically higher powered airplanes have had stub exhaust pipes 4 or 6 inches long and do not warp valves, or need back pressure. It is just nonsense. A open valve could have somewhat cooler air blow into it. It will however cool rather evenly as a result. Back pressure can only help an engine if the pressure pulses are timed through real research/dyno testing to hold in intake charge that would be exiting the port from supercharging or radical cam timing. Usually the header systems are designed to be a partial vacuum at the port to assist in scavenging all exhaust out. I recommend a muffler however. Because an H with a straight pipe has given me tinnitus in both ears (it is very not good) Jim
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Today's Featured Article - Massey Ferguson 35 (and up) Tractor Assembly Notes - by Jack Wetmore. These assembly notes are for Massey Ferguson tractors with a two stage clutch and 6 speed, 8 speed and mutli-power transmissions. I see a lot of discussion forum messages regarding damaged clutches from improper assembly. The objective is to have the engine and transmission slide together safely and easily until the gap between the two halves is less than 1/4", BEFORE tightening any of the bolts holding the two together. Using bolts to draw the two halves together will damage the PTO
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