Prater

I have some excess oil pan pressure on my engines. The cylinder leakdown and pressure tests are normal, but there is still a pressure issue at high rpm. I have ran an electrical vacuum pump on one of my race cars before and was wondering if anyone has ran them on a boat. I do not want to pull through the carbs because of the excess oil being scavenged through the breather. The carbs already need a good cleaning.

If you are running vacuum please let me know how it is working for you. I can go electric again or run a crankshaft pump.

Thanks

GOODT

id double check the leakdown #s sounds like excessive blow by

Ratickle

Hotrod1 runs them on all four of his Cary engines. Send him an email.

johnnyboatman

iTrader: (5)

are you sure your not over filling the oil,what pans, where is it coming out of.

Prater

Johny, oil level is fine. It is blowing through the pcv valve, and around the oil caps. It also has two air vents with K&N filters to help with crankcase pressure. The oil pressure is running around 80psi. That is causing the oil leaks around the oil cap which I cannot keep tight due to wear on the valve covers. I hate the old style twist on oil fill caps. I had an engine with this same problem about ten years ago and solved it with aftermarket vacuum pump. That was on a NA motor. These motors have B&M chargers with 850 Nickerson Carbs. The carbs are really getting an oil bath.

Strip Poker 388

iTrader: (6)

how much boost????????

Prater

5lbs at 4900RPM

Prater

Could not find that member, does he go by a differnet username?

Thanks

BenPerfected

Prater,
I run a twin engine vacuum pump system (1 pump for both engines). It does manage the blow by, but at a cost. Even cutting out the cost for the learning curve, here is what you get:
- The system is not maintence free
- It sucks out .5 qt.(+/-) of oil per operating hr
- The total cost is about $1500 (plus labor/time)
- It added about 4 HP at 10-12lbs. vacuum
- On the dyno it was figthing the oil wet sump oil pump at 13+lbs.
- Etc.
All this for having a marginal valve cover system? Where is the real benefit?...drag racing at 16-20 lbs vac with a dry sump oil system.
If you still want to pursue this, PM me.
Sprague

JimV

iTrader: (1)

Are the valve covers baffeled at the oil fill. Also im sure you know there's aftermarket bungs that are screw in with o rings. Hey Sprague