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normal but not ideal, it's an unfortunate side effect of your PCV system, it vents the crankcase into the intake so it doesn't vent to atmosphere and is cleaner. best case is it smells better and you don't show up to work smelling weird. otherwise, i don't like it. :-)
I was changing my 2016 to the 2017 cover and found oil in where the cooling blocks are. Is this normal ?
normal=sucks.i pull my lid before I put it away for the winter and clean out the oil.if you put a catch can on to stop this voids warranty.read my post.
yup.tune also.2 big no,nos.i would run a catch can because I do not like oil in my supercharger,but gm says no.so I pull the cover and clean it every 2500 miles.no big deal.
So stupid question,,, where does the air intake to the valves. Does it travel through the coolers to the valves. If so should I expect the coolers get clogged with the oil residue ?
So stupid question,,, where does the air intake to the valves. Does it travel through the coolers to the valves. If so should I expect the coolers get clogged with the oil residue ?
I do not think coolers will get clogged with oil residue,but someone smarter than me can answer this question.oil in supercharger is a concern for cokeing building up on valve stems.do a search here for better answers.
So I see how to fix the problem. I have to pull the super charger off and put a catch can in. From what I see the hose runs next to the belt? That seems bad. Also will the computer know that the pressure is vented ? This seems crazy. Is there a benefit to the oil mist? Also any cleaners I can spray through the fins to clean the oil out ?
seems like putting oil in the exchangers would be inefficient for heat transfer.
The oil you see is only a fraction of what went through the combustion.
Indeed. This is why I get confused about people who think it's a good ideal to pull the cover and clean in there every so often... it hides the evidence, but doesn't change or solve the problem.
And while I don't like it, I don't personally really care if there's oil in my intake or even in my intercooler. But I do care if my motor is ingesting a lot of oil because it's (a) probably going to accumulate on the backs of the valves eventually, and (b) leads to detonation.
Oil has an octane of about -50. It's bad mojo especially on a supercharged engine, so if I could get an efficient catch can, I'd still be tempted, at least once I was out of warranty.
The most important thing I don't know is what percentage of oil a quality catch can will actually scrub. 99%? 10%? Makes a big difference.
since they decided to vent the engine straight into the air chamber for the supercharger .the only way to divert it is to take the intake apart and divert the flow outside of the engine. Is there any benefit in oiling the intake. I see it being a gunked up mess in the intake over time. I would think they would have thought of this in the design process.
I would buy the catch can kit and do the mod but my worry is it needs the oil mist ?
I think GM has stated the catch can is not needed, but they don't go into detail about the oil mist being necessary, etc. There are tons of debates about this.
It is a bummer they didn't run the crankcase line outside of the supercharge and then back into the intake like they did on the LSA. That makes it easier to install a catch can.
the better designed catch cans will cure that for you. your engine will last much longer as well. are DI engines have this issue. BMW has a walnut shell blasting procedure which removes the build up in the combustion chamber. if it is bad enough, they will cover it under warranty. reports on BMW show reduced leakdown and restored performance after this blasting is performed.
better to just prevent it with a catch can. your LT4 will love it.
Same thing. I pulled the cover and ended up cleaning up the intake ports and as much of the bricks as I could when I installed the Mighty Mouse catch can. That has done the job and it's clean as a whistle now even with track duty.
If you're going to track the car, don't get the MMS extreme catch can. It's not needed until the big power range and it will dump oil out of the driver's side valve cover port on a hard braking right hand turn into the catch can filling it quickly. I would have a full can after a session. MMS worked with me to solve. We swapped back to the regular catch can hose setup and it's been perfect ever since.
While not ideal, completely normal and experienced by most SC'ed vehicles. I had a couple GT500s that seemed to be a little worse. Catch cans certainly help, but some say that they are not necessary and that the residue is harmless- evidently this is GM's position.
Tadge answered:
Good technical question vetteman96. The short answer is: No, we have not seen any issue with deposit buildup on the back side of the intake valves due to not having a port injection system.
You correctly point out that the continuous flow of clean air and gas over the intake valve tends to keep it very clean. That has been a characteristic of small block V8's for decades. Of course, appreciation of that characteristic is limited to those who disassemble their engines. Most customers are unaware.
Given that all SIDI engines give up that benefit in favor of other important attributes, we did extensive testing to make sure there were no customer-observable penalties. We intently looked for unusual deposit formation during the entire Gen 5 Small Block development phase (4 years) as well as the 200,000 mile in-vehicle long term testing. We have not seen anything unusual and zero performance degradation. Granted, deposit formation on SIDI engine intake valves is greater than what is seen with PFI engines, but the Gen 5 engines are typical for SIDI engines, and in fact better than other SIDI engines we have benchmarked. So the bottom line is that we believe the carbon build up is only an internal cosmetic issue, not anything that will affect customers over the life of their cars.
-gm can void your warranty for ANY mod they decide to blame a failure on, not catch cans and tunes only.
-of course gm will say this amount of oil consumption is fine. anything is perfectly fine as long as it can make it through warranty period.
-you will not find anyone that thinks oil on intercooler bricks or being burned is a good thing in general
06-25-2017, 09:13 PM
Swapped the cover to the 2017 cover and found oil...is this normal?
