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Old 04-09-2014, 09:15 PM   #1
Randy Burkey
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Default panhead crankcase vent

I bought a bike with a Pandemonium 88" motor..seems to have good compression and doesn't smoke, runs good .. But the crankcase breather seems to blow out excessive oil.. Once the motor is operating temperature if I blip the throttle sitting still, it will put out a mist of oil on the ground.. I just have a 6" hose going toward ground?? any thoughts? Thanks, Randy..As an afterthought(edit) I'm running open belt primary and belt final drive, so venting into primary case is not an option..

Last edited by Randy Burkey; 04-09-2014 at 09:19 PM. Reason: more details
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Old 04-09-2014, 10:03 PM   #2
leoj
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Default Re: panhead crankcase vent

Do you have a lot of miles on it yet? Does it sit for a period of time between runs?

If you haven't ridden it a lot, could be just a slightly bad checkball in the pump and there's a bit of oil build up in the case.
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Old 04-10-2014, 09:31 AM   #3
Randy Burkey
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Default Re: panhead crankcase vent

Thanks, I'll ride it for awhile and see what happens..
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Old 04-10-2014, 10:27 AM   #4
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Default Re: panhead crankcase vent

My 1973 shovelhead does not blow oil or smoke but seems to really pump out a lot of air. Is that ok?
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Old 04-10-2014, 11:37 AM   #5
Randy Burkey
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Default Re: panhead crankcase vent

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Originally Posted by Randy Burkey View Post
I bought a bike with a Pandemonium 88" motor..seems to have good compression and doesn't smoke, runs good .. But the crankcase breather seems to blow out excessive oil.. Once the motor is operating temperature if I blip the throttle sitting still, it will put out a mist of oil on the ground.. I just have a 6" hose going toward ground?? any thoughts? Thanks, Randy..As an afterthought(edit) I'm running open belt primary and belt final drive, so venting into primary case is not an option..
Would it help to put a longer hose and a breather upward on the end?? or create more problems?
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Old 04-10-2014, 12:18 PM   #6
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Default Re: panhead crankcase vent

Do not put any kind of filter or other obstruction on the breather. You will regret it. The breather expells the air that is under the piston on it's downstroke, if it is restricted by a filter the air will go out elsewhere. Like the pushrod tubes or base gaskets. The more air being pushed out of that breather the better. If there is excessive oil with it then the scavenging side of the pump isn't working well or the breather timing in the cam chest needs attention.
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Old 04-10-2014, 01:36 PM   #7
dan r
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Default Re: panhead crankcase vent

I'm not up to speed on a pandawhatever engine...

does it have the normal pan type oiling system?
if so, pans had a primary chain oiler feature with the oil pumps that spewed some oil mist into the crankcase breather system.
look for a small adjustment screw and lock nut on the side of the oil pump body, turn the screw in...
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Old 04-10-2014, 02:58 PM   #8
Randy Burkey
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Default Re: panhead crankcase vent

I have 2 small adjustment screws on oil pump 1 comes out the center of the face towards rear of bike, and 1 comes out the side of pump towards the right of bike.. I thought I read on here that closing them completely might do damage??( top end??)
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Old 04-10-2014, 11:20 PM   #9
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Default Re: panhead crankcase vent

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Originally Posted by Randy Burkey View Post
I have 2 small adjustment screws on oil pump 1 comes out the center of the face towards rear of bike, and 1 comes out the side of pump towards the right of bike.. I thought I read on here that closing them completely might do damage??( top end??)
rear adjuster is to adjust oil flow for a rear chain oiler.
side adjuster is to adjust primary oil flow that leaks into the breather passage that gets blown onto the chain.

no way adjusting them can alter flow to the top end... they both get the oil from the return circuit anyway. if some one told you it will alter the flow to the top end, they don't understand how an oil pump works.

any chance of a pic of your pump?
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