Crankcase Vacuum Pump System

For most modest horsepower street engines however a vacuum pump.

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. 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. These solutions may be achievable for under 100 to upwards of 1 500. 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.

This blow by airflow creates a positive pressure in the crankcase the vacuum pump sucks air out of the crankcase with its negative airflow. Even on the high end this may only represent less than 25 percent of the cost of a dry sump oiling solution. 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.

This is done using a vacuum pump. At nrc it costs less than 100 for that extra stage. The extra cost of a four stage pump will net you around 15 hp in most cases. 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.

Belt or electric vacuum pump. The vacuum pump is an engine driven accessory that ensures that there s always plenty of vacuum capacity. Optimized crankcase ventilation systems and the addition of a vacuum pump can swing positive crankcase pressures to zero atmospheric or even negative values vacuum. Another option is to evacuate the crankcase and valve cover by pulling a negative pressure on it.

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.