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Blowby versus engine load #3294561
02/26/14 03:00 AM
02/26/14 03:00 AM
Joined: Dec 2002
Posts: 41,556
'Stralia
Shannow Online content OP
Shannow  Online Content OP
Joined: Dec 2002
Posts: 41,556
'Stralia
I've driven past this very spot over 4,500 times (more than double that if you count going the other way at the other part of the day)...and I have noticed this effect, but only yesterday it sunk in.

As I come into town, I can see the train lines as they come into/out of town. One line is oiled heavily, the other is pristine...


Train lines being what they are, the traffic in both directions must be the same, bar a possible few handfuls of retired trains.

Trains on the left are climbing s slight grade into town (grade saves brakes as they slow into town)...they are also loaded (typically with coal) as they head that way towards the coast (power stations and export)...all engines running.

Thus the ones on the left are running hard, at load, and blowing by their crank breathers...on the right, they are on the return trip, unloaded, and still powering slightly, with not all engines running.


This is pretty typical, three engines (first two were running), and empty coal cars (100 tonne each, 80 tonne coal to fill them)...

Amazing what a difference 3,500 tonnes on the drawbar will do.

Re: Blowby versus engine load [Re: Shannow] #3294565
02/26/14 03:38 AM
02/26/14 03:38 AM
Joined: Jan 2012
Posts: 1,121
Hawkinsville Ga
Fleetmon Offline
Fleetmon  Offline
Joined: Jan 2012
Posts: 1,121
Hawkinsville Ga
Excellent picture (beautiful view too!) that shows the results of engine loading.

I used to work on off-road dumps that had to struggle out of a strip....the road showed the loads the 12V71's were subjected to. Down travel only showed tire tracks and the typical DD droppings.


"In order to become the Master, a cunning person may act as a servant."

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Re: Blowby versus engine load [Re: Shannow] #3294576
02/26/14 04:20 AM
02/26/14 04:20 AM
Joined: Dec 2002
Posts: 41,556
'Stralia
Shannow Online content OP
Shannow  Online Content OP
Joined: Dec 2002
Posts: 41,556
'Stralia
Yeah, not a bad view to come home to of an afternoon.

Re: Blowby versus engine load [Re: Shannow] #3294607
02/26/14 06:02 AM
02/26/14 06:02 AM
Joined: Jan 2014
Posts: 689
us
datech Offline
datech  Offline
Joined: Jan 2014
Posts: 689
us
Two stroke diesels, I would imagine.

Re: Blowby versus engine load [Re: Shannow] #3294654
02/26/14 07:22 AM
02/26/14 07:22 AM
Joined: Apr 2008
Posts: 12,982
Onondaga County
Miller88 Offline
Miller88  Offline
Joined: Apr 2008
Posts: 12,982
Onondaga County
I'm not sure that's so much blowby as it is "rolling coal"


18 Forester 2.5I 6M
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Re: Blowby versus engine load [Re: Miller88] #3294667
02/26/14 07:42 AM
02/26/14 07:42 AM
Joined: Nov 2009
Posts: 5,126
Houston, Texas
motor_oil_madman Offline
motor_oil_madman  Offline
Joined: Nov 2009
Posts: 5,126
Houston, Texas
Originally Posted By: Miller88
I'm not sure that's so much blowby as it is "rolling coal"


He's talking about the breather tubes dumping out oil on the track. Notice how one track is clean and the other is dirty.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Blowby versus engine load [Re: Miller88] #3294669
02/26/14 07:44 AM
02/26/14 07:44 AM
Joined: Nov 2009
Posts: 5,126
Houston, Texas
motor_oil_madman Offline
motor_oil_madman  Offline
Joined: Nov 2009
Posts: 5,126
Houston, Texas
There is always more blowby on a lightly loaded engine. The heavier the load, the greater the seal is on the piston rings.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Blowby versus engine load [Re: Shannow] #3294708
02/26/14 08:22 AM
02/26/14 08:22 AM
Joined: Jul 2005
Posts: 11,378
NorthEast
Vikas Offline
Vikas  Offline
Joined: Jul 2005
Posts: 11,378
NorthEast
Bus is the load same in both the direction?

Re: Blowby versus engine load [Re: motor_oil_madman] #3294772
02/26/14 09:12 AM
02/26/14 09:12 AM
Joined: Apr 2008
Posts: 12,982
Onondaga County
Miller88 Offline
Miller88  Offline
Joined: Apr 2008
Posts: 12,982
Onondaga County
Originally Posted By: motor_oil_madman
Originally Posted By: Miller88
I'm not sure that's so much blowby as it is "rolling coal"


He's talking about the breather tubes dumping out oil on the track. Notice how one track is clean and the other is dirty.


Ha! Didn't even notice that.

Makes sense. Especially on a turbodiesel. Pulling a hill that has to be pretty heavily loaded and at full boost.


18 Forester 2.5I 6M
00 Jeep Cherokee
01 Ford F-350 XL 4x4 5M
Re: Blowby versus engine load [Re: Shannow] #3294779
02/26/14 09:15 AM
02/26/14 09:15 AM
Joined: Jun 2003
Posts: 17,817
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,817
Deplorable in apple valley, ca
Another possibility is a privatly owned train that runs the same tracks every time and has a leak. As kids we would stand under a bridge as the train went over us only to come out covered in dirty oil.


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Re: Blowby versus engine load [Re: Chris142] #3294981
02/26/14 12:25 PM
02/26/14 12:25 PM
Joined: Nov 2010
Posts: 9,783
Saskatoon canada
Clevy Offline
Clevy  Offline
Joined: Nov 2010
Posts: 9,783
Saskatoon canada
Originally Posted By: Chris142
Another possibility is a privatly owned train that runs the same tracks every time and has a leak. As kids we would stand under a bridge as the train went over us only to come out covered in dirty oil.



That wasn't oil bud.
The toilets empty on the side of the tracks. That's why they don't let you use the toilets when stopped at a station.


Hehehe


2006 Charger RT
Miles x 2 per oil filter
Re: Blowby versus engine load [Re: Vikas] #3295137
02/26/14 02:04 PM
02/26/14 02:04 PM
Joined: Dec 2002
Posts: 41,556
'Stralia
Shannow Online content OP
Shannow  Online Content OP
Joined: Dec 2002
Posts: 41,556
'Stralia
Originally Posted By: Vikas
Bus is the load same in both the direction?


3500 tonnes more coal on board heading left to right across the page. Slight grade coming up into town.

Re: Blowby versus engine load [Re: motor_oil_madman] #3295570
02/26/14 08:53 PM
02/26/14 08:53 PM
Joined: Oct 2008
Posts: 1,561
Flatlands of Indiana
JetStar Offline
JetStar  Offline
Joined: Oct 2008
Posts: 1,561
Flatlands of Indiana
Originally Posted By: motor_oil_madman
There is always more blowby on a lightly loaded engine. The heavier the load, the greater the seal is on the piston rings.


While that makes sense, it doesn't seem to match my observations. For example tractor pulling engines appear to put out more blowby when loaded heavily. But to be fair, I didn't see them operate at the same RPM's unloaded.


My weakness is I love all motorcycles regardless of brand
2017 Wide Glide
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Re: Blowby versus engine load [Re: JetStar] #3295726
02/26/14 11:37 PM
02/26/14 11:37 PM
Joined: Dec 2013
Posts: 3,756
Massachusetts
turtlevette Offline
turtlevette  Offline
Joined: Dec 2013
Posts: 3,756
Massachusetts
I can't believe that in this day and age they would allow oil to be dumped right on the tracks.

Are you sure that's what this is?

Re: Blowby versus engine load [Re: Shannow] #3295765
02/27/14 01:59 AM
02/27/14 01:59 AM
Joined: Dec 2002
Posts: 41,556
'Stralia
Shannow Online content OP
Shannow  Online Content OP
Joined: Dec 2002
Posts: 41,556
'Stralia
It's not really "oil being dumped on the tracks", it's crankcase breather fumes, that contain some soot, air, exhaust gasses, and yes, oil.

They are puffed out the breather under load, and as trains run in pretty well defined paths, they locate where they do...It's a fine spray, and probably about as biodegradable form as it can be versus pools/streams of the stuff. Massive surface area, exposed to oxygen and UV etc.

Mental exercise for you...say each tyre loses 1lb of rubber dust during it's life, and 200M tyres are sold in the US each year, how much rubber dust is "dumped" right on the road

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