Do lorry engines shut off fuel to some cylinders on motorway?

JMTHORNLEY

Member
Location
Glossop
It was an idea banded about for a while but trouble is in the UK we have such varying topography that it’s not ideal. I drive a 460 HP motor and there’s very few times I’d be happy for it to shut a few cylinders down 🤣
 

Flatlander

Member
Arable Farmer
Location
Lorette Manitoba
im In the flattest area you could drive in and pulling a load is still needing every horse to do it’s share. Between wind and suction behind the truck and physically rolling the tires with a load on there are next to no time I’d like to see a few cylinders go out of commission. Also the lost exhaust gases going o the turbo would cut its boost pressure killing off the remaining cylinders.
 

Andrew

Member
Location
Huntingdon, UK
Scania eco cruise will put the gearbox in neutral before the crest of the hill, so you top the hill 3-4mph slower than the cruise is set, then pick up speed as you coast downhill. If you pick up to much speed it puts it back in gear so you get some engine braking.
 

grass man

Member
Scania eco cruise will put the gearbox in neutral before the crest of the hill, so you top the hill 3-4mph slower than the cruise is set, then pick up speed as you coast downhill. If you pick up to much speed it puts it back in gear so you get some engine braking.
How will it know its before the crest of the hill? Is it Gps linked?
 

ACEngineering

Member
Location
Oxon
Seems another pointless emissions thing imo! Just like the smart alternators.

If your off throttle coasting down hill the engine is in overrun and governor has shut the fuel off anyway🤔🙈 if common rail the ECU would shut the injectors off.

Most stuff wont even record a MPG when overrunning down hill, both current van and the old one just went blank on the MPG display.
 

Robt

Member
Location
Suffolk
Seems another pointless emissions thing imo! Just like the smart alternators.

If your off throttle coasting down hill the engine is in overrun and governor has shut the fuel off anyway🤔🙈 if common rail the ECU would shut the injectors off.

Most stuff wont even record a MPG when overrunning down hill, both current van and the old one just went blank on the MPG display.
Not quite, it’s all about smooth driving. By using GPS it takes driver error out of situation. How can driver think to shut off throttle while going down hill all while eating a pot noodle, picking his nose, using his phone, hoovering his curtains, and gawping at the legs of the lady in lane 3
 

Al R

Member
Livestock Farmer
Location
West Wales
You could pull the lever on the pump of the old 5 cylinder Gardner to shut of the supply to individual pots to save fuel . Not sure you could reach from the seat though😊
Starting them on a cold morning you could warm a Gardner up a few at a time could you not?
 
Think a Cadilac V8 saloon shut off some cylinders to save fuel , talking back in early nineties from memory.

Guessing with the latest ecu's and engine management wouldn't be much of an advantage or saving to be made.

Some cars satnav and cruise control are linked perhaps Merc S class so similar to the Scania system.
 

kiwi pom

Member
Location
canterbury NZ
Seems another pointless emissions thing imo! Just like the smart alternators.

If your off throttle coasting down hill the engine is in overrun and governor has shut the fuel off anyway🤔🙈 if common rail the ECU would shut the injectors off.

Most stuff wont even record a MPG when overrunning down hill, both current van and the old one just went blank on the MPG display.
Yes I always thought that if you coast in gear the fuel was shut off but if you coast in neutral the engine has to use fuel to keep it idling.
Might be wrong though.
 

CHAP Webinar - Innovative tools to overcome the challenges of Regen Ag

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Applying principles of regen ag can incur a range of on-farm challenges. Learn how innovative tools & machinery can help with these hurdles.

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