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FMF Ram reeds vs stock


ETR174

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theyre oil feed holes alright ! if you look at the crank webs youll notice a raised shoulder where the bearing sits against. this creates a small space between the web and bearing, approx .5mm-1mm. the crankcase is a continuos fluxuation of high and low pressure through each cycle. which meens everything starts at the carb and works its way toward the cylinder. this meens with the small gap between the web/bearing, surely there is a scavenging of fuel mix through the bearing and out the hole.

 

 

CrankCenterBearingDisassembly19_zps236b8

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for the most part the oil just passes through the engine with little chance of staying behind and collecting in any one area. even though it takes several cycles for a gulp of fuel mixture to reach the cylinder, it still gets there rather quickly. 10k rpm is 167 revolutions per second. even if the fuel mix takes 4 revolutions to reach the cylinder, its only sitting in the crankcase for 24 thousandths of a second. hardy enough time to gravity feed down to the bearing :lol:

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