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#3294561 - 02/26/14 03:00 AM Blowby versus engine load
Shannow Offline


Registered: 12/12/02
Posts: 39875
Loc: '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.

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#3294565 - 02/26/14 03:38 AM Re: Blowby versus engine load [Re: Shannow]
Fleetmon Offline


Registered: 01/26/12
Posts: 1121
Loc: Pa
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.
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#3294576 - 02/26/14 04:20 AM Re: Blowby versus engine load [Re: Shannow]
Shannow Offline


Registered: 12/12/02
Posts: 39875
Loc: 'Stralia
Yeah, not a bad view to come home to of an afternoon.

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#3294607 - 02/26/14 06:02 AM Re: Blowby versus engine load [Re: Shannow]
datech Offline


Registered: 01/14/14
Posts: 689
Loc: us
Two stroke diesels, I would imagine.

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#3294654 - 02/26/14 07:22 AM Re: Blowby versus engine load [Re: Shannow]
Miller88 Offline


Registered: 04/09/08
Posts: 12704
Loc: Onondaga County
I'm not sure that's so much blowby as it is "rolling coal"
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#3294667 - 02/26/14 07:42 AM Re: Blowby versus engine load [Re: Miller88]
motor_oil_madman Online   content


Registered: 11/29/09
Posts: 4858
Loc: 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.
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#3294669 - 02/26/14 07:44 AM Re: Blowby versus engine load [Re: Miller88]
motor_oil_madman Online   content


Registered: 11/29/09
Posts: 4858
Loc: 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.
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#3294708 - 02/26/14 08:22 AM Re: Blowby versus engine load [Re: Shannow]
Vikas Offline


Registered: 07/22/05
Posts: 11251
Loc: NorthEast
Bus is the load same in both the direction?

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#3294772 - 02/26/14 09:12 AM Re: Blowby versus engine load [Re: motor_oil_madman]
Miller88 Offline


Registered: 04/09/08
Posts: 12704
Loc: 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.
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#3294779 - 02/26/14 09:15 AM Re: Blowby versus engine load [Re: Shannow]
Chris142 Offline


Registered: 06/05/03
Posts: 16824
Loc: 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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#3294981 - 02/26/14 12:25 PM Re: Blowby versus engine load [Re: Chris142]
Clevy Offline


Registered: 11/11/10
Posts: 9783
Loc: 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
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#3295137 - 02/26/14 02:04 PM Re: Blowby versus engine load [Re: Vikas]
Shannow Offline


Registered: 12/12/02
Posts: 39875
Loc: '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.

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#3295570 - 02/26/14 08:53 PM Re: Blowby versus engine load [Re: motor_oil_madman]
JetStar Offline


Registered: 10/02/08
Posts: 1541
Loc: 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.
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#3295726 - 02/26/14 11:37 PM Re: Blowby versus engine load [Re: JetStar]
turtlevette Offline


Registered: 12/24/13
Posts: 3561
Loc: 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?

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#3295765 - 02/27/14 01:59 AM Re: Blowby versus engine load [Re: Shannow]
Shannow Offline


Registered: 12/12/02
Posts: 39875
Loc: '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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