Project VIPER GTS: Part 8 – Bob’s Air-Oil Separator
All cars create blow-by and positive crank case pressure which forces oil and vapors into the engine’s intake to be burned off for reduced emissions. This problem is worse on forced induction cars and performance cars driven at the track. Not only does this oil gunk up the intake tract and valves, it reduces the octane of your fuel which robs power and causes detonation. We installed a Bob’s Air-Oil Separator to the PCV valve and a catch can for the valve cover vent to see how much oil our Viper’s engine is pumping into the intake after some street and track use.
Bob’s Auto Sports has been around for many years catering to the Mustang and Corvette crowd with their Air-Oil Separator (AOS) kits that have been highly acclaimed for their effectiveness on the street and at the track. The AOS is an air-tight, sealed container that maintains the emissions-controlling effectiveness of the PCV system, while using baffles and steel filtering media to separate the oil from the crank case vapors so only clean air enters the engine. The oil is collected in a reservoir to be drained at a later time.
Made in the USA and featuring a large chamber and superior filtering media, the Bob’s AOS is proven at the track in many racecars around the country. We chose their Universal Oil Separator Kit
with the standard bracket for our Viper. We will go over all the parts needed at the end of the article.
Bob’s Air-Oil separators come in a variety of colors to match your engine bay. We chose a discreet matte black to blend in and maintain an OEM look.
It's important to regularly check and drain oil from the Air-Oil separator’s reservoir. Bob’s AOS utilizes this high quality and smooth operating ball-valve which makes draining the oil very easy. This is one of the nicest ball-valves I’ve worked with and it has a nice resistance to its actuation. This is far better than the commonly used compressor drain valve. We decided to check the oil after 1,000 miles.
Almost the size of a can of soda, the Bob’s AOS is larger than it appears in images and it’s capable of holding a lot of oil. Due to its solid construction, a strong mounting bracket is required to hold the AOS since it’s too heavy to be suspended from rubber hoses. Bob’s model-specific kits (Mustangs, Corvettes, and Challengers) include all necessary brackets, hoses, barbed fittings, nuts and bolts to be installed with optional upgraded lines and hardware.