Auto-X problem - with Video!, I have a crankcase pressure issue Options

[Tom Perso]

Hey Guys,

I took the 914 out this weekend for my first Auto-X. It's a 74 slantnose with stock suspension, a stock front swaybar, and Yokohama A-008R's on Empi rims (they are just the Auto-X rims).

The motor is a Raby-inspired 2270 "C" motor (with too large intake valves).

I had some issues at high RPMS with blowing oil out of the valve cover gaskets and pushrod tube seals. I only had one vent on the case (at the oil filler) and I determined that I needed a little more venting due to the higher displacement and higher RPM's.

I had a second set of valve covers, so I drilled and added a 1/2" barbed connection that sits above the retaining bail (on each side). I vented each valve cover up to the air filter cover for the Webers.

I took the car out for a little spin and no more blowing oil! I figured I had success...


So, fast forward to the event. I take off around the course and at the first long sweeper and I bumped 7000rpm. I really needed second gear for where I was at, so I figured I'd get it right the second time around...

So, after that long sweeper, I start blowing oil out of the exhaust - badly. But it didnt last for long. I still had good pressure, so I dropped down to second gear and limped around the rest of the course.

Around the last sweeper I blew some more oil and then the motor almost quit at the ending gate.

To make a long story short, I sucked more oil into the carbs and finally fouled the plugs.

Here's the pathetic video...

http://www.qtm.net/~persot/914_smoke-1.wmv

So, should an external breather box help the situation or did I got wrong with adding the vents to the valve covers?

Any ideas/suggestions would be appreciated!

Thanks,
Tom