Hi all just thought I would post some useful info about series 60 blow by figures, as I found it a little difficult obtaining same.
New engine / rebuilt engine blowby between 1.5 and 2.0 Inch H2O is normal
Blowby between 2.1 and 3.0 engine is still very good
Blowby Between 3.1 and 3.9 still ok
Blowby between 4.0 to 5.0 Engine is expected to last up to between another 120,000 to 240,000 miles or 200,000km to 400,000km
Hope this helps someone in the future, regards Dave
Detroit series 60 blowby information
Discussion in 'Trucks [ Eighteen Wheelers ]' started by AUSSIE DAVE, Aug 23, 2012.
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Last edited: Aug 24, 2012
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don't know what those numbers mean.
but any blowby is a sign of old age for the most part. cept for the slight mist of a new engine.
i drove a dump truck for 2 years before new pistons finally got installed. that was not fun having a find a bathroom somewhere at a minutes notice.
don't miss them days at all.
but i don't think you're going to see blowby on todays trucks. i know govt regs were passed in 07 to keep that stuff from emitting into the atmosphere. as such. newer engines recirculate the stuff and there's no more blow by tubes.
least the 2 2007 petes i drove with cats didn't have any vent tubes. -
Blow by is standard equipment on a Detroit.
fortycalglock and MNdriver Thank this. -
yea most new engines recirculate the blowby back into the engines system and reburns it again.
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Blowby still exists in every engine, it is a means of measuring engine wear, Detroit place truck on dyno under load and install equipment that measures the blowby, the above information were sourced from Detroit. I posted the info so that anyone purchasing a Detroit has data to figure out approximately how good or bad the engine on the truck is.
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Inch of H2O , ok if you are looking at buying a truck with a series 60 in it and the truck yard already has had a blowby test done ( some here in oz do blowby on all trucks they sell) you can use the figures to work out if the engine is good.
Worthken Thanks this. -
what also doesn't make sense is that fact you can't measure it. becuase it's recirculated into the engine. meaning no blow by tubes anymore.
i know ALL engines have blowby. there's no such thing as the perfect seal. that's why there's no more blowby tubes. it's all recirculated.
guv law passed in 05 written for 07 and newer. they don't want that crap venting into the atmosphere. -
They can still test, they use the dipstick tube or filler tube
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