Crankcase Vacuum Pump System

Crankcase pressure is evacuated via the valve cover and pumped to an external tank which vents the pressure and retains excess oil for periodic draining.

Crankcase vacuum pump system.

The extreme solution to prevent all of this is to install a vacuum pump that continuously draws the pressure out of the crankcase. These solutions may be achievable for under 100 to upwards of 1 500. Even on the high end this may only represent less than 25 percent of the cost of a dry sump oiling solution. At nrc it costs less than 100 for that extra stage.

This reher morrison big block chevy illustrates the simplicity of an external vacuum pump system. Upgrading to a high lift cam can reduce the available vacuum so you may need to upgrade your vacuum pump as well. For most modest horsepower street engines however a vacuum pump. Belt or electric vacuum pump.

The net difference between the air being sucked out by the pump and the air generated by the engine with blow by yields the effective vacuum. The vacuum pump is an engine driven accessory that ensures that there s always plenty of vacuum capacity. If you run a dry sump system with a three stage pump one pressure stage two scavenge stages in most cases you cannot achieve a sufficient level 8 hg of crankcase vacuum to achieve that power gain. Vehicles use the vacuum generated by the engine to operate the power brake booster and other pneumatic systems.

Actually an oem pump is a very reliable pump designed for many years of use because there s thousands of hours in gm and ford engineering in them. This blow by airflow creates a positive pressure in the crankcase the vacuum pump sucks air out of the crankcase with its negative airflow. The pump can be either electric or mechanically driven but for an ideal solution should be connected to both the block and the valve cover to pull vacuum from both areas efficiently. This is done using a vacuum pump.

The extra cost of a four stage pump will net you around 15 hp in most cases.