jwog666

besides, like is stated in this link i posted earlier(read the thread it describes why they dont work well), 99% of the catch cans on the market do a **** poor job of actually catching the majority of the vapor any way, so until i can find one that works well if seems like $100 for something that works poorly is a waste

barstowpo

It is interesting that the cars at the Ford Performance Racing School do not use the oil separators, however all the cars at the GT350 Track Tour had them. Ford Legal mandated them I was told.

jwog666

if i had to venture a guess that would be due to that paticular engines high redline and the track use it would b e experiencing. street cars hardly ever see sustained 5k + rpm, and high g cornering that might cause higher than normal crankcase vapors

barstowpo

My car does.

jwog666

then go for it, just trying to prevent people from impulse buying a product that is geared towards worry warts, that really doesnt address an actual problem

Kyle@ROUSH

Pull the throttle body and intake manifold off any vehicle made in the last 20 years that has some mileage and you know you'll see carbon and oil film, its there. I have not personally known anybody that had a failure of any type that would have been prevented by a catch can. Oil in the cylinder could lower your octane rating slightly, which is a big reason the people i know running them do so, however again I've never seen a failure due to not having one. If you ran pump gas and a custom tune that was on the ragged edge, I'd probably say get one. Our cals are very conservative and safe. If it was a different vehicle, like some of the new ecoboost cars with direct injection that coke the valves very quickly i'd say run one for sure but i wouldn't sweat it on your application. Again, if it makes you sleep better at night, put one on, but there haven't been failures due to the lack of a catch can here so its your choice.

Mr. D

Excellent post Kyle! Thank you!

svfetter

Kyle is absolutely right. Going back to the fnsweet days when there was a lot of activity there. Many, Many Roush owners added the catch can. For the two reasons mentioned, Octane and oiling down the intercooler. I believe the intercooler was the most important to most of the Roush owners because an oiled down intercooler will not be nearly as efficient at transfering temps resulting in a loss of HP. Many of those Roush owners at the time on fnsweet were tracking their cars and they did not want the drop in horsepower. So this addition became the talk of the forum for a while. Even though my 427R is mainly a show car, a Sunday car, with an occasional trip to a track, I put one on mine as well just because I wanted to. I drain mine every time I change the oil which is not very often due to the low miles. I still see a small amount of oil each time. Most of the time not enough to fill a shot glass but it is working. For the average driver, there is no need to have one, unless you want one like Kyle said.