FMF Ram reeds vs stock

[registered user]

without some kind of hole the bearing would be mostly sealed off from any lubrication as the distance between the crank web and bearing is pretty small

[Deadbeat]

i think you might of just shattered a few mofos conceptions on those oil feed holes, clean looking work

[registered user]

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.

 

 

[Deadbeat]

i mean a lot people including myself assumed they where gravity fed

[registered user]

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

Edited November 25, 2014 by registered user

[trickedcarbine]

True. I've never messed with them much, but your makin' sense.

[registered user]

i made some molds of unmodified tunells. it give me a better 3d image of whats going on and how i want to change them

 

[sheerider1026]

Interesting to say the least

[trickedcarbine]

There's a hole in your piston!

[sheerider1026]

Compression relief boost port FTW!!

[registered user]

thats from where i filled the case with oil to check volume

[trickedcarbine]

Please keep track of all the before and after volumes of anything getting changes. That could be interesting.

[registered user]

i been keeping track but obtaining a specific primary ratio isnt high on my priority list. gonna use some special longer rods and a side affect will be some added volume but im not sure how much as of yet and really i dont care but ill probly check it again with oil once i get everything setup, mostly just out of curiousity