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Old 11-08-2010, 07:05 PM   #136
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Joined: Apr 2007
Location: Austin, Texas
Oddometer: 329
Keepin' this one alive I have follow up question for all you motor guru types...

Could these leaks be caused by excessive internal crankcase pressure? This is always an issue on constant-high-RPM road race singles. Supermono types. Also rears it's ugly head in singles in flattrack racing. There are a number of way people try and deal with it but the most effective seems to be some sort of one-way crank vent.

My thinking here is since the F800 is a 360* twin, it's effectively a big single with regards to this topic. The semi-dry sump seems to take care of the motor pumping all of it's oil out (trust me, I've seen that happen on a hod-rod single and it aint pretty) but the crankcase venting seems to be overwhelmed thereby leading to excessive internal crankcase pressure. Here's a link to some info on the concept from Michael Moore of eurospare fame. Also, here's a recent conversation in the tuners section at that discusses the topic.

Any thoughts?

jscottyk screwed with this post 11-08-2010 at 07:13 PM
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