Crankcase Pressure

Camarob859 · 05-24-2016, 10:20 PM

Whats the best way to get rid of crankcase pressure with out a pan evac system for a small block stocker??

mike britt · 05-24-2016, 11:09 PM

Go get you an electric air injection pump off a toyota or gm and build a scavenge tank with a breather. Cheap and easy and fairly effective.

HandOverFist · 05-25-2016, 07:10 AM

My low buck solution and legal...

V M Kauffman · 05-26-2016, 12:29 PM

The better the engine is sealed up the less Blowby you will have which equals less Crankcase Pressure you will have. If the engine is a wet sump you can measure the Blowby with a good Blowby meter. Low leak down readings do not equal low Blowby.anything over 2cfm is too much.

Glenn Briglio · 05-27-2016, 09:14 AM

Quote:

Originally Posted by HandOverFist

My low buck solution and legal...

What does this do?

HandOverFist · 05-27-2016, 11:35 AM

Quote:

Originally Posted by Glenn Briglio

What does this do?

Just a simple path for pressure to escape.

Ron Gusack · 05-27-2016, 11:58 AM

If you have the valve cover connected to the fuel pump block off I don't think you're doing anything. They see the same pressure. I use manifold vacuum through the base of the carb and run a vacuum gauge to measure pan vacuum. It's not great but I do pull about 5 inches at the starting line. That's with both crank seals in the correct way.

Ron Gusack · 05-27-2016, 12:00 PM

Quote:

Originally Posted by mike britt

Go get you an electric air injection pump off a toyota or gm and build a scavenge tank with a breather. Cheap and easy and fairly effective.

Is this what they call a secondary air pump?

Glenn Briglio · 05-27-2016, 12:10 PM

Quote:

Originally Posted by mike britt

Go get you an electric air injection pump off a toyota or gm and build a scavenge tank with a breather. Cheap and easy and fairly effective.

No bueno..........not legal in stock eliminator

HandOverFist · 05-27-2016, 12:24 PM

Quote:

Originally Posted by Ron Gusack

If you have the valve cover connected to the fuel pump block off I don't think you're doing anything. They see the same pressure. I use manifold vacuum through the base of the carb and run a vacuum gauge to measure pan vacuum. It's not great but I do pull about 5 inches at the starting line. That's with both crank seals in the correct way.

Ron - The valve cover is vented to atmosphere...the crankcase only in a torturous way. I only configured a more direct route.

Btw, the above images do not show that a breather is used on the passenger side cover. No breather/sealed on the driver side.

05-24-2016, 10:20 PM	#1
Camarob859 Junior Member Join Date: Jul 2010 Posts: 52 Likes: 4 Liked 8 Times in 3 Posts	Crankcase Pressure Whats the best way to get rid of crankcase pressure with out a pan evac system for a small block stocker??

05-24-2016, 11:09 PM	#2
mike britt Member Join Date: Mar 2013 Location: Italy, Texas Posts: 141 Likes: 203 Liked 43 Times in 19 Posts	Re: Crankcase Pressure Go get you an electric air injection pump off a toyota or gm and build a scavenge tank with a breather. Cheap and easy and fairly effective.

05-25-2016, 07:10 AM	#3
HandOverFist VIP Member Join Date: Oct 2013 Location: Gulf Breeze, FL Posts: 1,655 Likes: 8 Liked 33 Times in 16 Posts	Re: Crankcase Pressure My low buck solution and legal... __________________ Rich Taylor I/SA - 321

05-26-2016, 12:29 PM	#4
V M Kauffman Member Join Date: Mar 2013 Location: Greentown, IN Posts: 113 Likes: 0 Liked 0 Times in 0 Posts	Re: Crankcase Pressure The better the engine is sealed up the less Blowby you will have which equals less Crankcase Pressure you will have. If the engine is a wet sump you can measure the Blowby with a good Blowby meter. Low leak down readings do not equal low Blowby.anything over 2cfm is too much.

05-27-2016, 11:58 AM	#7
Ron Gusack Member Join Date: Feb 2009 Posts: 243 Likes: 1 Liked 7 Times in 6 Posts	Re: Crankcase Pressure If you have the valve cover connected to the fuel pump block off I don't think you're doing anything. They see the same pressure. I use manifold vacuum through the base of the carb and run a vacuum gauge to measure pan vacuum. It's not great but I do pull about 5 inches at the starting line. That's with both crank seals in the correct way.