Archives: Bob’s Blog

Bob’s blog.

NA Racing Engine Intake Design vs Cylinder Volume

Normally aspirated (NA) racing engines are popular throughout the world, both in land and water motorsports.  When the intake valve opens in this design, the piston changes direction from exhaust evacuation to intake inlet.  As the piston goes down the cylinder, air pressure drops.  Atmospheric pressure that is higher is outside of the engine.  That […]

HP Gain from Small Opening in Roots Blower Case

Roots blowers are popular in motorsports for making more power. They are made up of a simple blower case with two rotors inside. The rotors spin from an engine driven blower drive. This pumps extra air into the engine. With extra air and the appropriate extra fuel, extra power! The blower case design was changed […]