old school crankcase evacuation

[sidemarkers]

Have mine routed to a port on the berg breather. Hooked up a vac/pressure gauge to a different breather port and pulled about 6 inches of vacuum at 4000 rpm.

Who else has experience with these?

[jim martin]

Long time ago played with the Morosso pan evac kit.
I’m thinking this is what you are referring to.
Engine needs to be sealed real well internally and externally. mixed results and measured mine at the case. For an accurate reading measurement point should be in case or valve cover .
I also have some old berg breather units that mount to the alt stand .
They are just a simple small vent box extension with a place to connect not needed valve cover vents and have a breather cap .
So unless I’m wrong you must of capped that off for it to work ?
Post up some pictures. Hope this helps
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[sidemarkers]

Yes,I believe it's a Moroso based system.

The Berg stand has an oil fill cap instead of a breather element, with 1 of the barbs used for the evac and the other 2 capped off.

Clear hose is being used for the initial testing to monitor potential oil draw, none so far.

Ideal setup would be on a N/A merge collector without a muffler, but so far it does seem to work well on a unmuffled turbo down pipe.

[dunk]

I've run one before.. difficult to tell "exactly" how well it worked, but engine was crisp, liked the higher rpms, no evidence of blowby and didn't leak a drop. Imo really does help ringseal, but piping can be awkward/ugly depending on how you like your engines to look.

Consider you need a sealed system, so... are you running a sand seal pulley?... provision to keep the dipstick sealed?... and if you get it working really well, tactics to keep the rocker gaskets in place...

[sidemarkers]

[rugblaster]

I had a pan evac setup on a drag racer I built. The reason being I was familiar with work done at Reher-Morrison Race Engines in Arlington, Tx.
The first pass after the install resulted in both valve cover gaskets being sucked into the heads, a subsequent major oil leak and fire. Nothing serious. I had to glue the gaskets on the valve covers with 3M Trim Cement. I think they work and don't know why someone wouldn't want try it.

I built this buggy with a hot little motor in it. I didn't put a pan evac on it because it's a street car, I didn't want to fuck up the jet hot coating on the header, and I'm not twisting it's tail like I did the drag racer.

_________________
'69 Karmy, '69 Camper, Meyers clone, '65 drag bug, 10.78 @ 128 (sold it) '51 Dodge farm truck,
'09 MB E350 '18 MB E400, '65 Plymouth Valiant convertible and a '19 Ford F250 King Ranch (nicer, but dirty, farm truck)

VWoA factory trained line tech 75 till 90 or so
ASE Master Certification
VWoA Assoc. of Quality Technicians inductee (One of 25 in the five state southwest region)
La Confrerie des Chevaliers du Tastevin (San Angelo Chapter)
TCU ......GO FROGS!!!!!!

[sidemarkers]

Are you sure you used a pan evac and not a valve cover evac kit, the part numbers are very similar.

Reher-Morrison is no joke tho, I love hearing tidbits of peoples' history on forums.

The jet hot looks minty fresh!

[jim martin]

[quote="sidemarkers"]

[sidemarkers]

My old professor would be ashamed of me using the term "vacuum".

Let's instead use "pressure differential".

I may have to investigate this further. The gauge was bouncing about 6 digits below ambient pressure. The berg oil filler was open to the crankcase although somewhat separated by the alternator stand oil deflector louvers.

This begs the question...is the airflow restriction caused by the deflector louvers more or less than the airflow restriction caused by the air gap around the pulley?

[rugblaster]

The whole idea is to get the oil fog away from the rotating assembly. It is a form of "free" horsepower. They work by creating a negative pressure environment within the case. This allows the oil being cast off the crank to drop to the bottom of the sump. Best case is a dry sump and negative pressure in the case.

Another idea is to run on the ragged edge of too little oil pressure and volume (smaller oil pump) General rule was 10 psi oil pressure for every 1000 rpm. Some folks believe that number can be cut in half, at least. More free horsepower. Some of these folks were accused of "cheating" in class racing and were make to tear their motor apart for inspection. Nothing ever was found and the protest money was forfeited. Free horse power is sometimes hard to find.
_________________
'69 Karmy, '69 Camper, Meyers clone, '65 drag bug, 10.78 @ 128 (sold it) '51 Dodge farm truck,
'09 MB E350 '18 MB E400, '65 Plymouth Valiant convertible and a '19 Ford F250 King Ranch (nicer, but dirty, farm truck)

VWoA factory trained line tech 75 till 90 or so
ASE Master Certification
VWoA Assoc. of Quality Technicians inductee (One of 25 in the five state southwest region)
La Confrerie des Chevaliers du Tastevin (San Angelo Chapter)
TCU ......GO FROGS!!!!!!

[jim martin]

the only reason i stopped playing with pan evac was i did not like the oil in the exhaust , i added a oil separation unit and that worked pretty good . i think if i remember 2-3 inches maybe pulled on a very well sealed motor , but as soon as ring seal was going away whole other story .
also like everyone ive sucked in a valve cover gasket or two in my time , once i figured out why and vented the case correctly issue was gone .
next stage was vacuum pump but again if you have poor ring seal you will have issues and you need a bypass system for when case pressure reaches past the zero mark .
and of course final stage is adding a drysump into it and using that as a case vent and overpressure catch can if needed .
_________________
B.C's fastest street legal vw , June 2006 Hot VW's feature car 9.81 sec at 145.26mph.
Sponsored by :
LUCAS OIL PRODUCTS http://www.lucasoil.com
KROC head porting services
Dialedinperformance.com
Airspeedparts.com topic http://airspeedparts.com/forums/index.php?topic=914.0

[oprn]

[sidemarkers]