Fuel consumption at Idle - Sprinter

[se97mlm]

There are at least 5 different engine options in the Sprinter:

• 88 bhp
• 109 bhp
• 129 bhp
• 150 bhp
• 184 bhp

Fuel quantity used at idle is based on the number of cylinders rather than the full load rated power output. Is related to friction you see.

Approximately 4mg per cylinder per 2 revs AC off, 7mg per cylinder per 2 revs AC on.

 

[BTB 500]

Fuel quantity used at idle is based on the number of cylinders rather than the full load rated power output. Is related to friction you see.

That makes sense, although friction would surely be affected by cylinder capacity (ring circumference and stroke) too.

But really just making the point that there are lots of different engines in the Sprinter, I think the most powerful one is a V6 (and so far only 4 and 5 cyl engines have been mentioned).

 

[Dieselman]

Fuel quantity used at idle is based on the number of cylinders rather than the full load rated power output. Is related to friction you see.

Approximately 4mg per cylinder per 2 revs AC off, 7mg per cylinder per 2 revs AC on.

This is why once a tuning map or box has been installed the fuel consumption readout of the on board computer is all to pot, the ECU no longer knows the accelerator position so can't calculate how much fuel is being delivered.

 

[fredfloggle]

That makes sense, although friction would surely be affected by cylinder capacity (ring circumference and stroke) too.

But really just making the point that there are lots of different engines in the Sprinter, I think the most powerful one is a V6 (and so far only 4 and 5 cyl engines have been mentioned).

That is more like it !

it is much more complicated than just number of cylinders - ring contact area , bearing configuration , type of cam follows , oil pressure - over square/under square - you need to also look at BMEP amongst other things .

 

[Dieselman]

That is more like it !

it is much more complicated than just number of cylinders - ring contact area , bearing configuration , type of cam follows , oil pressure - over square/under square - you need to also look at BMEP amongst other things .

I think se97 was referring specifically to the engines listed.
For a given modular engine design he is correct, each cylinder requires a set amount of fuel to overcome friction.
Eight cylinders requires twice as much fuel as four cylinder.

 

[jaymanek]

For a warm engine (coolant=80°C) at sea level, with and without A/C consumption is approximately:

2.2 4 cyl AC on: 0.86 Litres per hour
2.2 4 cyl AC off: 0.49 Litres per hour
2.7 5 cyl AC on: 0.62 Litres per hour
2.7 5 cyl AC off: 1.08 Litres per hour


Matt

Think you got the last two wrong way around..

 

[Dieselman]

He's already hanged himself for that..

 

[jaymanek]

oh sorry!

 

[se97mlm]

I think se97 was referring specifically to the engines listed.
For a given modular engine design he is correct, each cylinder requires a set amount of fuel to overcome friction.
Eight cylinders requires twice as much fuel as four cylinder.

Sorry, forgot also to mention, within the same engine family...

 

[daronb]

Nice on guys ! This is the info I need ! ! ! !

I work for a company that makes a Fleet Tracking solution and one of the main Returns on Investment is being able to break driver habits. An example would be over idling which is measured (with GPS tracking) as ignition on but going nowhere. It's not just the cost of fuel either, but the damage to the vehicles engine. As an example of how serious vehicle manufacturers are about it now the new Mercedes Sprinter has a feature called MSS which will stop the engine if it is in neutral, and idle for more than 3 seconds to reduce fuel consumption and wear. I believe Mercedes have estimated you can restart a vehicle up to 10 x / minute with less wear on the vehicle.

 

[GazCaff]

Nice on guys ! This is the info I need ! ! ! !

I work for a company that makes a Fleet Tracking solution and one of the main Returns on Investment is being able to break driver habits. An example would be over idling which is measured (with GPS tracking) as ignition on but going nowhere. It's not just the cost of fuel either, but the damage to the vehicles engine. As an example of how serious vehicle manufacturers are about it now the new Mercedes Sprinter has a feature called MSS which will stop the engine if it is in neutral, and idle for more than 3 seconds to reduce fuel consumption and wear. I believe Mercedes have estimated you can restart a vehicle up to 10 x / minute with less wear on the vehicle.

What name will this tracking device be known by? Might I suggest you call it 1984?

 

[Kaji]

We have a 2002 Sprinter with a 213CDI, but I fear it would take too much effort to help with your request. The only easy way I can picture you getting an answer is to completely fill the tank to the brim. Not moving it, then allow it to tick-over for an hour. When the hour is up, then top the vehicle up back to the brim, but why?

If you think your vehicle is overly thirsty then that is a different issue?

Good luck getting an answer.

Regards
John

There are at least 5 different engine options in the Sprinter:

• 88 bhp
• 109 bhp
• 129 bhp
• 150 bhp
• 184 bhp
  

  For a warm engine (coolant=80°C) at sea level, with and without A/C consumption is approximately:
  
  2.2 4 cyl AC on: 0.86 Litres per hour
  2.2 4 cyl AC off: 0.49 Litres per hour
  2.7 5 cyl AC on: 0.62 Litres per hour
  2.7 5 cyl AC off: 1.08 Litres per hour
  
  divide by 4.54 to get gallons per hour.
  
  Had my laptop plugged into a Sprinter this afternoon and the figures are spot on.
  
  Regards
  
  Matt

  Matt, what a great response. Thanks for that. Validates my decision to move from my Silverado-based Provan Tiger to a Sprinter-based SWB camper even if it lacks a coach AC, as does my Tiger. Here in southern California AC is pretty much a requisite for sleeping at night in the summer, especially out on the desert. BTW, preferably 4x4 for me.

John, what a great response

 

[m80]

Ask a Siberian,
they need to let their vehicles keep running in winter, so they don't need to light a fire under the engine to restart it.
Least they did back in 2007.

 

[toolman1954]

This is a 12 year old thread? Where are we going with this?

Steve.

 

[m80]

Nowhere, it's at tickover,



sorry.

 

[190]

As an example of how serious vehicle manufacturers are about it now the new Mercedes Sprinter has a feature called MSS which will stop the engine if it is in neutral, and idle for more than 3 seconds to reduce fuel consumption and wear.

White van man isn't gong to like that. They will sit in them for hours with the engine idling. What is it about diesels that makes people not want to turn them off.