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It's like the old Duck question! The stuff I and many other's collect looks like oil, feels like oil and smells like oil! Let's hope what is in the crackcase isn't that much blowby as it is oil mist, burnt oil particle from the oil leaving the bearings in the crack main and journal bearings and hitting the bottom of the very hot pistons as well as fine "oil" particles.
The LT1 also has oil squirters that spray oil on the cylinder walls under certain conditions. Sure there is some water and other combustion gases, which is why I call it "stuff." All I and those that add a "can" know is we're catching some of that "stuff" and dumping it! It's stuff that does not have a chance of causing coking!
Very disappointed in you Jerry.
Im certain you could have written at least five more paragraphs in that reply …
Maybe put some pictures in there too. Like one of a boat or something.
Last edited by PatternDayTrader; 08-09-2018 at 04:05 PM.
Very disappointed in you Jerry.
Im certain you could have written at least five more paragraphs in that reply …
Maybe put some pictures in there too. Like one of a boat or something.
Maybe the guys that don't put a can onto the car really don't care how their car will be running after a few years. Are they trade it in & let someone else deal with it... Robert
None of my previous Corvettes came with a catch can - neither did my C7 - nor, did my Ferrari come with one.
In have more than 700,000 miles in Corvettes over 29 years, and 40,000+ on my Ferrari - no engine failures - or even a need to open the engine....
If a catch can were needed you'd think the engine designers would go, "Hey! We need a catch can here....!"
None of your prev vette was DI only saying does it have to have one on it NO but I just can think in my mind HOW it will not help if the can will catch even just a little in it between oil chg.
Very disappointed in you Jerry.
Im certain you could have written at least five more paragraphs in that reply …
Maybe put some pictures in there too. Like one of a boat or something.
I actually enjoy these Threads! You're right should have found a pic of our Lake with ducks! BUT we have just closed the gate valve on the old 8'X10' brick overflow and the Lake is back filling with water. No ducks, geese or Herons yet! Would not believe what we had to do for SCDHEC to build a new overflow pipe! Here are a few pics!
A 9 foot diameter standpipe feeds a 90 foot long 7 foot diameter pipe! It's in addition to the 8X10 foot brick overflow that was there before the breach and we had to fix and maintain! Had to pour concrete under and up to half way on the 7 foot pipe. Contractor did not have and engineer so calculated the buoyance force for pourable concrete. It was 200,000 lbs! Luckily it did not move! What I found interesting is the engineering firm our "Dam Engineer" suggested we hire, designed this structure and insisted concrete rather than compacted dirt be used (because of the large diameter) but had never seen it done and had no suggestions on how to hold it down the pipe while pouring!
I actually enjoy these Threads! You're right should have found a pic of our Lake with ducks! BUT we have just closed the gate valve on the old 8'X10' brick overflow and the Lake is back filling with water. Would not believe what we had to do for SCDHEC to build a new overflow pipe! Here are a few pics!
A 9 foot diameter standpipe feeds a 90 foot long 7 foot diameter pipe! It's in addition to the 8X10 foot brick overflow that was there before the breach and we had to fix and maintain! Had to pour concrete under and up to half way on the 7 foot pipe. Contractor did not have and engineer so calculated the buoyance force for pourable concrete. It was 200,000 lbs! Luckily it did not move!
Since this forum turned into a Pipefitters Forum here is a picture of yours truly welding on big inch pipe during construction of the Strontia Springs Dam in Colorado.
None of my previous Corvettes came with a catch can - neither did my C7 - nor, did my Ferrari come with one.
In have more than 700,000 miles in Corvettes over 29 years, and 40,000+ on my Ferrari - no engine failures - or even a need to open the engine....
If a catch can were needed you'd think the engine designers would go, "Hey! We need a catch can here....!"
Yep with port injection or carbs there was NO problem as gasoline with cleaning additives washed it away before it could bake on! For your info, Ferrari was considering recommending for their DI engines an annual cleaning regiment with liquid cleaners. With Ferrari, read expensive. They found as did others once you bake the "stuff" on the valves a cleaner is NOT very effective!
Remember these ads? Only works with a carburetor or port injection where gas passes over the valves. Yep Top Tier would be effective IF it contacted the back of the valves BUT it doesn't with DI (Direct Injection!) Top Tier does help with deposits in the combustion chamber and the thing I worry most about, sulfur coating the fuel sender!
Yep with port injection or carbs there was NO problem as gasoline with cleaning additives washed it away before it could bake on! For your info, Ferrari was considering recommending for their DI engines an annual cleaning regiment with liquid cleaners. With Ferrari, read expensive. They found as did others once you bake the "stuff" on the valves a cleaner is NOT very effective!
That's not completely true Jerry.
Deposits on the valve head have been an issue for a very long time. Typically with older systems, its on high mileage engines, and it will cause cold start drivability problems for around 60-120 seconds as the deposits absorb fuel that would normally enter the combustion chamber. This results in very lean fuel mixture until the deposits are saturated.
And, like ive stated here before, the coked oil comes from the valve guides; that is the answer.
Since this forum turned into a Pipefitters Forum here is a picture of yours truly welding on big inch pipe during construction of the Strontia Springs Dam in Colorado.
Funny am currently working as an expert witness for a wrongful death lawsuit where someone welded on a pipeline in Michigan!
boofus, I had to laugh. Not at you, but at the question. It's like asking, should I get "black or chrome wheels", "manual or automatic", or "does the jeans make my butt look big". The best suggestion I have is if you want one for the peace of mind then by all means yes, you should get one. We're just going to confuse you with the answers we give.
Liked your post best of all! I did get quite an education on the topic. I'm going to pass on doing it. It's just one more thing I don't want to mess with right now. Thank you for your humor! And by the way, I first drank Rebel Yell in college and can still find it in the liquor stores!
I know this subject has been covered a few times, but I for one appreciate the different opinions that are related with backup, logic, etc. I also appreciate the way JerryU and Foosh (and others) have exhibited very different opinions without resorting to name calling and some other juvenile stuff I occasionally see from a small handful of members. I also appreciate the humor in here too. My thanks for an informative discussion.
Even if it caused no coking at all, I only want 1. Air 2. Fuel being burned in my motor. Oil can lubricate or chill in a catch can
Good point, having to ingest crackcase "stuff" in the combustion chamber to mix with the carefully controlled air/fuel mixture is an issue with race engines. Some use the exhaust to pull crackcase "stuff" out and form a partial vacuum in the crackcase.
The crack and rods spinning in a partial vacuum consume less air resistance and therefore take less energy! Some race engines use extra scavenge pumps on their dry sump system to achieve ~ 5+ psi crackcase pressure reduction and can gain 10 to 15 hp!
The other option used until the EPA dictated PVC system in the 1960s is a road draft tube. Found this pic of one on an old flathead like to the one I had in my '50 Ford. As the car moved the crackcase "stuff" just got sucked out of the crackcase into the air!
Fortunately some of the 600+ folks who have viewed this Tread as of this post are more technically curious and care about the issues than others! For some folks, if it gets past a two line Twitter statement they won't bother to try to understand!
I mostly post for that silent majority rather than the ~20 vocal minority (like myself) who have posted on this one!
08-09-2018, 04:04 PM
Maybe the guys that don't put a can onto the car really don't care how their car will be running after a few years. Are they trade it in & let someone else deal with it... Robert
