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Curious question
Blow By.
On these Detroit series 60 how much is to much? I know these engines always dump some via the crank case tube, but how much would be considered an issue? I only have about 156k on my power train I know they can go 1 million miles or so. Just wondering. Also would a valve adjustment if needed assist in decreasing such and issue? -
11 Replies
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Not much. Detroit probably has a gauge/meter they attach to the slobber tube that measures blowby?
A less scientific way that I use is: there shouldn’t be any oil blowing out the slobber tube onto the debris flap or whatever your towing. We flog our 94k mile DD 60s pretty hard when pulling our stacker trailer, 5.5 mpg. There is never any oil that blows out of the slobber tube onto the debris flap or trailer. -
A little bit of blow-by is not the end of the world. An engine with high oil consumption can still produce full power. I had a Continental IO520 engine with some corrosion in the cylinders due to lack of use when I bought it. It still produced full power and I had no issues over the five years I owned the plane. Only downside was the oil slick on the belly of the plane after 50 hours. I considered it corrosion protection. If I recall correctly, Continental allowed up to 1 quart of oil consumption for every hour of flight time (out of 12 quarts total) to remain air-worthy.
Newer engines will route the blow-by back into the intake. If yours goes straight to the ground and messes up your tow vehicle, you could add a catch-container that will collect the oil mist.
Having said all that, a quick way to increase wear in your engine is “dusting”. I.e. any leak on the vacuum side of the air inlet pipes/filter assembly will suck in dust and increase wear quickly. That is a good thing to check for.
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If you reroute the crankcase breather preturbo it acts as a crankcase scavange and will pull vacuum. Increased power and mpg.
2000 Featherlite H3-45
2024 Jeep Grand Cherokee
Leesburg, FL -
if you reroute the crankcase breather preturbo it acts as a crankcase syringe and will pull vacuum. Increased power and mpg.
Thinking about this ..over a long period of time oil fumes blow by will clog your CAC (charge air cooler) . Do you really want to do that ?
AL
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That was one of the concerns when I bought my ’99 Ford with the 7.3. Everybody jumped the band wagon and wanted to be like the big boys, vent to atmosphere. One of the reasons was oil in the CAC. I did that for the longest time, on a VW TDI also. In the later years before I sold them I replumbed to what the OEM had setup, which is preturbo.
The truck went to a mpg of 19-20 from a high of 18. The VW jumped from low 40’s to 46. Sold the truck with 150k miles, the VW had almost 200k. Both good engines.
You pick your wars and make your choice. I don’t know how much vacuum they pull but you could hook up a gauge to the crankcase. I know the race car with a dry sump pulled vacuum and made power, the sound was different also, effects how the rings seal, which might be the reason may not.
As to filling the CAC with oil, it is not a matter of filling but coating the inside. It will reduce the cooling effect, but does the increased mpg and power make up for that? You decide.
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What in the world is this guy smoking??????????????????????????
Later
bv
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With the cost to replace a CAC on a Prevost, I doubt you want it getting coated with oil.
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Your message talks about vehicles run by gasoline so I assume you have not put this plan to work on a turbo DD series 60.
Give American Fleet in Springfield MO. a call with your idea.
Listen for the click.
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You are right on break line between engine models .Totaly different enviromental control system. My 2000 is a pre egr engine. I would ck to make sure which system you have. Big Big diffenance in engines! ask Jon. Your engine on the side of valve cover will give you all the info. was not uncommon to use left over stock to next year production or year of chassi mfg is not same as conversion..Many coach engines that are not used only last 100,000 miles.. Mine has 329,000. No blow by or oil use. Not many ways pressure can get in crank case. If turbo seal between sides were bad=air plus oil= appear as smoke out exhaust. so leaves valves head gasket etc. If oil level is getting lower that is a possibility. My 60 series oil level level stays the same 1600 mile trip to florida and back.
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Lol this has turned out to be a funny topic. We should further discuss this I think
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What I described doesn’t work on the 2 strokes with the pressurized crankcase. Maybe that will clear some misunderstandings.
And there are some pretty nice air/oil separators available to plumb inline if one was concerned about the intercooler.
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