We’ve decided to dig back in the archives on Thursdays to lake another look at topics that have held their staying power over time. Our first foray through the time portal takes us back to the summer of 2013, and a tech article we called Tech: How External Vacuum Pumps Free Up Horsepower. This article featured products from Moroso Performance Products.
We took a look at how external vacuum pumps provided power gains by promoting piston ring sealing. In the case of Moroso, their dedicated external vacuum pumps provide engine builders another tool that helps with engine building and tuning.
In essence, the external vacuum pump helps get rid of excessive crankcase pressure that neutralizes the amount of windage in the crankcase, and promotes piston ring seal. This prevents potential power from escaping around the piston rings and creating more atmospheric pressure in the sump.
As the article pointed out, escaping gasses around the rings is not the only area where horsepower is helped by these external pumps. When the gasses blow by the rings and get into the sump area, this exacerbates windage and increases parasitic drag on the rotating assembly.
Moroso’s enhanced design vacuum pump (#22642) was featured in the article, and is still a popular item for engine builders. It is a lighter pump with sealed roller bearings for maintenance-free operation. The 4-vane design pulls nearly 14 percent more vacuum and weighs less than the original style (#22843) pump.
For more information on Moroso’s external vacuum pumps, visit them online at www.moroso.com.