Anyone Run Vacuum Pump?
 

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

Re: Anyone Run Vacuum Pump?
 

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

Re: Anyone Run Vacuum Pump?
 

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

Re: Anyone Run Vacuum Pump?
 

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

Re: Anyone Run Vacuum Pump?
 

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.

Re: Anyone Run Vacuum Pump?
 

how much boost????????

Re: Anyone Run Vacuum Pump?
 

5lbs at 4900RPM

Re: Anyone Run Vacuum Pump?
 

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

Thanks

Re: Anyone Run Vacuum Pump?
 

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

Re: Anyone Run Vacuum Pump?
 

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