Keep it Separated
Installing a Bob’s Auto Sports oil separator on a new Mustang GT
By Steve Turner
Your new Mustang’s positive crankshaft ventilation system’s top priority is improved emissions output, not maximum performance. As such, returning the unburned vapors from the crankcase to the intake to be burned again is its mission. An unfortunate side effect is that oil in this vapor from blow-by can contaminate the intake air.
Its main downside is that oil in the re-circulated vapor can actually diminish fuel octane, which can lead to detonation. As we know, the effect of detonation is, at best, decreased performance. At worst, detonation can lead to costly damage. If you own a supercharged Mustang with an intercooler in the inlet path, blow by can also clog it up and reduce its efficiency.
The hose from the passenger-side cam cover to the intake is the primary culprit in transferring oil contamination to the induction. A simple, but effective solution to this issue is to install an oil separator, or catch can, in the hoses between the cam covers and the intake system. Bob’s Auto Sports in Tampa, Florida, created on especially for the 2015 Mustang GT. The company designed its own unit for earlier Mustangs several years ago because it saw a need for a better mousetrap.
“At the time, nothing on the market was more than a cosmetic piece,” Steven Pellini of Bob’s Auto Sports said. “We are an engineering and manufacturing company so we have the means of building and testing multiple prototypes in house versus the others that are just outsourcing. This benefit helped us greatly with making an incredibly functional unit.”
The Bob Auto Sports oil separator is available in two configurations, Standard and Ultimate. The standard system sells for $114.95. It includes powdercoated brass fittings, rubber Eaton hoses, and stainless, worm-drive hose clamps.
“The size of the canister, size of the hoses, length of the hoses, all of those contribute to slowing the air down and letting it filter better. Also, our patented bottom-to-top-flow filter design keeps the oil further away from the outlet than any of our competition. Keeping the oil trapped in the media in the bottom is a huge benefit as when you have engine torque, potholes, speed bumps, loose oil in other units can bounce around and hit the unprotected outlet hole. We also offer multiple color options, hose/fitting options. It is much more custom unit than what else is on the market, and it features a drain valve on bottom, so you never need to remove the unit from your car.”
For another $85 you can step up the Ultimate system shown in our photos. This system upgrades you to aluminum AN fittings, Russell Pro Classic hoses, and Gates heat-shrink clamps. If you want the hydrocarbon finish shown here, that will tack on another $25, but you have to admit it looks great this way.
If you are familiar with the Bobs unit for the prior Mustangs, you’ll note this one is pretty similar. “We only had to redesign our brackets, and tweak the fittings angles and hose lengths,” Steven explained. “It was pretty painless.”
He walked us through the install process, which was painless as well, and if you keep reading all the way to the bottom, we will show you the hydrographic process, which is pretty cool.