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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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