Armen
Serious Thumper
Offline
Half-Witted Wrench-Jockey from Jersey
Posts: 1433
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Batman, I will when the bike is done. In the meantime, if someone wants some test guidelines, here goes: Take the bike out (stock) on a long section of flat road. Run it up as high as it will rev to in each gear. Take a note of the MPH (or KPH). Come back and remove the crank breather hose from the airbox. Plug the hole in the box, and put a K+N crank vent filter on the end of the hose. Repeat the run. Cut the hose and insert a one-way valve such as a automobile power brake vacuum valve in the hose and reinsert the hose into the airbox. Repeat the run. Remove the hose from the airbox, and reinstall the K+N crank vent filter. Run again. The folks from the Triumph Rat list saw consistent improvements by not routing the hot, oily crankcase vent air into the airbox. The last thing the engine wants (in other than freezing weather) is hot air. And the oil mist generated at full chat lowers the octane of the gas when it all meets up in the combustion chamber. As Verslagen pointed out, the breather hose is pretty small for a big single. By only allowing air out (one way valve) of the bottom end, the only air pressure building up in there wold be from heat and ring blowby. By the way, I did test all this stuff. Early 90's when I built an SR500 (punched out to 560) that won the AHRMA Sound of Singles Senior Class national championship. If you go to the vintage races, take a look at what the front runners are doing with the crankcase breathers. Cheap, easy, proven, and it works.
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