Crankcase pressure

chastaj · 8/19/14, 9:11 AM

Other than having too much oil in the engine, what could cause the crankcase pressure to throw oil out the vent filter that is on the front of my injection?

cmakin · 8/19/14, 11:05 AM

Quote:

Originally Posted by chastaj

Other than having too much oil in the engine, what could cause the crankcase pressure to throw oil out the vent filter that is on the front of my injection?

Blowby. . . . . anything that will pressurize the crankcase.

TQ29m · 8/19/14, 11:22 AM

What are we working on? A dirty filter will make it blo oil out, if it can't get air, it will get kinda messy, that is a 2 way street. Bob

chastaj · 8/19/14, 11:50 AM

Quote:

Originally Posted by cmakin

Blowby. . . . . anything that will pressurize the crankcase.

Brand new engine, all new parts, clean filters, etc. Ran hot laps and heat race fine. Did it during "B" main within 10 laps.

badcoupe · 8/19/14, 12:13 PM

Run a leakdown on all of the cylinders to make sure a ring didn't get broke etc. Also if it was too rich and the cylinders are washed out it can prevent good ring seal.

TQ29m · 8/19/14, 1:02 PM

Did you put too much oil in it, or did it end up that way? You might have a scavenge rotor bad in the oil pump Bob!

AP64 · 8/19/14, 1:21 PM

Could be running rich, and now you have fuel in the oil. Check the oil level, and compare it to what you started with. Pay attention to the color of the oil as well.

KYRON · 8/19/14, 4:01 PM

you probably burned a hole in the piston

Bradleyracing86 · 8/19/14, 4:36 PM

What kind of engine?

chastaj · 8/19/14, 5:40 PM

Quote:

Originally Posted by Bradleyracing86

What kind of engine?

Its a 12 degree Brodix Donovan Block set up.Heads have had very extensive work, so might be something there?

8/19/14, 11:22 AM	#3 Re: Crankcase pressure
TQ29m Senior Member Join Date: Aug 2008 Posts: 6,572	What are we working on? A dirty filter will make it blo oil out, if it can't get air, it will get kinda messy, that is a 2 way street. Bob __________________ "Being old, isn't half as much fun, as getting there"! Ole Robert I!

8/19/14, 1:02 PM	#6 Re: Crankcase pressure
TQ29m Senior Member Join Date: Aug 2008 Posts: 6,572	Did you put too much oil in it, or did it end up that way? You might have a scavenge rotor bad in the oil pump Bob! __________________ "Being old, isn't half as much fun, as getting there"! Ole Robert I!

8/19/14, 9:11 AM	#1
chastaj Member Join Date: Aug 2010 Posts: 245	Other than having too much oil in the engine, what could cause the crankcase pressure to throw oil out the vent filter that is on the front of my injection?

8/19/14, 12:13 PM	#5 Re: Crankcase pressure
badcoupe Senior Member Join Date: Aug 2008 Posts: 1,000	Run a leakdown on all of the cylinders to make sure a ring didn't get broke etc. Also if it was too rich and the cylinders are washed out it can prevent good ring seal.

8/19/14, 1:21 PM	#7
AP64 Member Join Date: May 2009 Posts: 243	Could be running rich, and now you have fuel in the oil. Check the oil level, and compare it to what you started with. Pay attention to the color of the oil as well.

8/19/14, 4:36 PM	#9
Bradleyracing86 Senior Member Join Date: Nov 2007 Posts: 1,621	What kind of engine?