Quote:
Originally Posted by SFV1LE
There are a lot of CC threads with strong opinions about the need for it, warranty issues, which one is best,etc. I have a few of questions...
- Is this mod primarily for modified cars running higher boost and +100 whp, or it it highly recommend for 100% stock cars as well?
- If someone is emptying their cc every 1-5k miles, I assume that means that the blow-by exhaust gas would be causing noticeable oil consumption as it escapes past rings and burns the oil on the cylinder walls below piston ring or burns intake oil vapor in combustion chamber, is that correct?
- If a car has zero oil consumption either during heavy track use or street use, does that mean they don't need a catch can?
I assume the answer is yes, if there is no oil disappearing from oil pan then it's not being burned by blow-by or vapor collecting in SC or other parts of intake tract. |
1. Yes, no. Cans will void your engine warranty. So why bother stock as it's all risk no reward. See also #3.
2. Not necessarily as not all crankcase vapors are oil. For example, winter driven short trips make a LOT of water condensate: "chocolate milk" in the can. So weekly empties is entirely reasonable. Whereas long summer cruises down the interstate will make very little condensate in the can, and almost all of it oil (water and fuel will evaporate). Do CC's help keep water/gas out of the crankcase? Maybe, but remember they are stopping it from from being burned at this point, so do they REALLY help? IMO, a weekly Italian tune-up and changing your oil frequently will do more for your car than a catch can in this scenario.
3. My take: "Need" is a matter of opinion more than fact as there has been very little evidence posted anywhere of valve buildup on LT4s. Almost all of the "scare tactics" pictures that I've seen posted by the MFR's are old truck engines. So IMO, yes, unless you're over-boosted or running high horsepower mods, you don't need one on the ZL1.
