Board index Flathead Power-Technical Questions, Answers, and Suggestions 45 Flatties About oil return

About oil return

Moderators: Curt!, Pa

Post Sat May 19, 2012 3:10 pm
JON

Posts: 98
Location: Helsinki, Finland
Hi guys,

Just got Mine to roll again, with new cyls, etc.
I added oil filter into return line (from a Panhead) some time ago. So now when I started "new" engine I could see how oil circulates. I wondered that last season also (now new cyls).
From return line oil comes at idle as pulses. Do not want to throttle much more now, when new things in. Seems like oil amount has to raise to some level in cranck-case and then it spits it out. As a "batch". Should it be constant flow or what?

JON

Post Sun May 20, 2012 5:43 am

Posts: 36
Intermittent spurts are normal.
Return pump is higher capacity than the supply pump, in order to stop oil build up in the crankcases, so it sucks air as well as oil back to the tank as level in cases rises and falls that little bit.

Post Sun May 20, 2012 8:34 am
JON

Posts: 98
Location: Helsinki, Finland
Thanks for info!

JON

Post Mon May 21, 2012 5:04 am

Posts: 307
Location: Ohio
Jon, Remember that idling a fresh engine for long periods of time should be avoided.
Steve

Post Mon May 21, 2012 1:05 pm
JON

Posts: 98
Location: Helsinki, Finland
Yep, I know.
JON

Post Wed May 23, 2012 5:25 am

Posts: 186
Doh What's wrong with idling a fresh engine for long periods, other than cylinder cooling.
Keith

Post Sat May 26, 2012 8:07 pm

Posts: 1674
Location: Interlaken, NY USA

About one quart every twelve minutes @ 2000 rpm's is normal oil flow for the flathead pump.
DL


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