Heymow - Lawnmower Racing Forum
Engine Help => Briggs Flathead => Topic started by: matthewfortson on December 01, 2013, 12:22:40 am
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My standard air filter has a connection to the rectangular cover for the valve springs, I just ordered an air filter from bmi and the adaptor that supposed to go with it doesnt look like it has a connection for the cover, any ideas?
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We normally just leave it hanging. You could attach a piece of tubing to it and run it down the frame if you like ( this would be to prevent a mess if any oil came out).
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O so there wont be any damage done if I dis connect it? And thanks
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Early on I made a plate to cover this, installed a fitting and ran a hose over to a collection tank. I was able to keep an eye on how much oil was pushed out. Later I hooked this line to a vaccum fuel pump. This created negative pressure in the base of the engine which gave more power. As long a ring seal is good, this is a power adder.
As George says, "A lot of little things add up to a big thing"
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Could I just point some tubing upwardly
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Later I hooked this line to a vaccum fuel pump. This created negative pressure in the base of the engine which gave more power. As long a ring seal is good, this is a power adder.
Forgive my ignorance but how does a vacuum fuel pump make a vacuum in the crank case? I have thought about creating crank case vacuum for more power but was not sure how to do it on a mower engine.
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They plumb it in to the side of the crankcase and pull air out. This will pull almost as much vacuum as it will provide pressure.
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Correct Royleblu, the vac signal comes from the intake which has little to do with crankcase vac.
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Didn't think a fuel pump could pump enough volume to make a vacuum in the crank case. Do you use a standard stock pump or something else? Would you plumb the pump into the stock crank vent and close the valve cover hole?