Maxie2U

Who leaves it in when they bring it into a dealer? People just remove them beforehand. Duh.

slickstick

I've reviewed all the arguments and based on:
1 - Lack of evidence that the C7 engines have any issue with valve coking.
2 - Lack of evidence of any tangible benefit of installing a catch can in a C7.
3 - GM will void the warranty if a catch can is found installed.

There is simply no reason to install one in a C7.

/Thread

Yokesc5

David@MMS

nothing to see here at only 30k miles; move along



not all catch cans are the same, some do more than filter out pcv oil. so if oil control is not the only ventilation concern you have, you are still in the market, even if you are cool with the above.

robert miller

^^^ David some people are just You cant show them are explain anything to them, like a mull with blinders on.Robert

mschuyler

"Duh" = "Fraud" in your case. So you do something you know will void the warranty. Something happens. You remove what you did and pretend you never did it. That's fraud, pure and simple. Duh.

Foosh

So David, is that a photo from an LT1 at 30K miles? Was it not labeled as such for a reason? Not all DI engines are the same.

LT4CMG

Come on, everyone knows that. It’s Clockwise, unless you happen to reside in the Southern Hemisphere, then it’s counterclockwise. Nice try, but easy question.

3AD2the31

Agree catch cans catch a lot of stuff I wouldn't want going back into my engine!

Kent1999

Same question here. LOTS of pics of various engines on the web with coking. I've yet to see a single one of a LT1 --so far, everyone just posts pics of NON-LT1 engines and pretends its the same.

Kingtal0n

Engines that have inadequate baffles or that are challenged by crankcase pressure/baffle issues (i.e. factory turbocharged engines of 80's and 90's) often have oil-catch devices that re-route the oil to the oil pan.

Once they got out of the 90's and into 2000 you barely ever see this anymore because technology has 'sealed up' the oil seals of engines and synthetic oils have made it possible to use very tight uniform spaces.

If you are about to tell me that in 2018 your brand new engine (from anywhere) needs a 90's style catch can on it, well I would say you are either joking or extremely unfamiliar with crankcase ventilation apparatus intended use, especially in racing.

This is what was basically said on page1-2 of this thread by some very intelligent person(s). So I don't know why this discussion continues.

Foosh

Good point . . . someone dredged this old thread up from the dead, so it's new to them.

robert miller

Man these motors still work the same as they did from the 1990,s ok. But for sure you have never had a blower & running boost on a car. If that pressure builds up & per say has no place to go it will find the weakest point in a motor & will blow out at the weak point.

On this car it will be the front & rear seals in it. But I have a blower on my car & choice to have one on my car.

Now I am ever more sure if you got your corvette to always drive it at the speed limit & NEVER per say give it much gas at all only to FINALLY get it up to the speed limit you should be fine in your corvette.

Plus I don't really want that dirty crap back into my motor & intake. If you do & don't care that is cool with me don't use one at all. You PCV system will do some what of a job for you. Robert

Kingtal0n

Oh here we go. Everyone of my cars is on boost. Since I was 15 years old. I only run turbochargers because superchargers eat too much rotational power for daily drivers and add no economy the way a turbo does. They are also noisy and seem to require more maintenance.

that said, carbon fragments are part of combustion when using cheap fuels, such as gasoline. If you weren't so cheap using gasoline all the time it wouldn't get any carbon buildup anywhere.

Oh wait, you said "pressure" as if it has something to do with buildup. It really doesn't. Crankcase pressure is a result of highly modified engine output. Especially when running boost pressure in a small displacement engine for example. It has to be dealt with: By a hole. LoL You put a hole somewhere in the engine that leads to an air filter from the crankcase and WHAM: no blowing out oil seals. Why doesn't oil blow everywhere though? because engines have oil baffles that separate crankcase from your fresh air tube. If the engine is modified and the original tube no longer sufficient: You install a larger tube/hole. lol. Its literally just a hole...

robert miller

^^^ ok that is cool DONE !! again it is your car do what every you want to do with it. Man have a great day. I would really hate to see what your car does do are could do in a race are in a 1/4 mile. Robert

Maxie2U

Talk about being pathetically disingenuous. Owners install them so they are able to remove them. DUH

Maxie2U

^^^^BS Alert.

If the CC caused the failure THEN and only then it would be fraud you. And given the fact CC don’t cause failures no fraud. DUH.

bigsapper

I posted a thread with a picture of a GenV L83.

Actually, I thought I did. There's a thread on performancetrucks.net with pics from a high mileage L83.

Kingtal0n

As an aside.

Distilled water is extremely cheap (I bottle for $0.02/gallon at home using a $99 reverse osmosis filter system, demineralized)

And it does an amazing job of keeping carbon off of valves, pistons, CC, etc...

Bill Dearborn

GM provides a 5 year 60K mile warranty on the power train. If they were worried about valve coking being a problem in less than 60K miles it seems they would have something in place to reduce the occurrence so they didn't get hit with excessive warranty repairs. If they aren't spending money to prevent valve coking it more than likely means it isn't a cost issue to them and we all know how much penny pinching auto manufacturers do. As it is there are few complaints about GM DI engines suffering from valve coking and they have put several million DI engines on the road that see much larger variation in usage than the Corvette engines see.

Bill