wowk

Hello,
I have an Escort van 1.8d non turbo i do around 500 miles a week in it probably 75% of that is just sat on motorways. Anyway i have heard a lot of people tell me tricks and tips about fuel efficient driving. So far keeping in the lorry lane i drive on the A1 keeping the speed at around 60mph i don't usually go down to below as a lot of lorries are governed at 56,57,58,59 and 60 so it always take years for lorries to pass and it clogs up the other lane so i try and keep my speed above the HGV's. Anyway doing this seems to be ok getting around 50-52 mpg. Anyway a lot of people have told me that doing this in a diesel and older diesel engines can clog them up with carbon deposits etc that's why you see a lot of black smoke and soot puff out of diesels when someone puts their foot down if they have been babied about all day. So is this i a no win situation? should i keep in high gears and keep the revs low, or should i occasionally go for a blast out in it to get rid of all the crap if i'm keeping at low revs a lot? Not sure if that one is a myth or what?

chalkey

diesels do love a good thrashing every now and again, it will do it more good than harm for the exact reasons you mentiond above

diesels dont like to be pottled about all day thats why you always hear of injectors packing up and egr valves clogging up on the newer stuff, they get blocked up and die

when i was doing my diesel apprentiship my teacher used to always say diesel engines are designed to be used flat out,

martysmartie

iTrader: (1)

It seems to me all Dervs chuck out black smoke when they accelerate hard, I think it's unburnt fuel, perhaps?

Martin

chalkey

black smoke is unburnt fuel yes, its also soot from build up

a badly chipped diesel will smoke badly also

martysmartie

iTrader: (1)

Also on standard examples as well perhaps, because if you think about it modern Dervs don't make efficient use of the fuel, due to 'Noax' emissions.

Martin

RichieST

iTrader: (2)

The equipment in our plant hire depot that have diesel engines are run flat out at full RPM all day from cold. We stripped one down the other day that had done 3600 hours, not a single bit of carbon build up or anything so yes, diesel engines need a damn good thrashing.

Don't forget things like tyre pressures, having a roof rack, carrying excess weight etc all have an impact on mpg.

ajamesc

nox is the product of an efficient engine lol
That's why as truck engines get more fuel efficient and the diesel is burnt better the nox rate go's up which is the reason it's neutralised with ad blue as nox is harmful when breathed in or is some cause neutralised with egr!
But when euro 6 emission regs come out they will have eas (ad blue system ) and egr to meet the regs

Mr.T

The euro 5 non ablue scania's allready had EGR so did man but they allready used ab with that.

As for the fuel thing. Keep looking around you all the time. So you can see what the other is doing. This will result in less braking and with that less pulling up. Go off the gas early at trafficlights and roundabouts so it can pull thru on rolling force. (Bad english being dutch is a great excuse ). Fuel efficient driving isn't that hard. You just have to think forward. What gear to choose, what speed etc.

ajamesc

I don't no about man and scania I no there egr and were experimenting with ad blue I didn't think they had both on the truck at the same time!
I work for daf and the xf 106 will have both on it to meet emission reg on euro 6

Mr.T

The 280 up to 380 scania engines only use EGR but i believe they use high press injection. I had a scania 480 same engine as the 440 and they only used EGR to meet euro5. But now the 440 and 480 need adblue to. I wonder what brussel is going to think up next

ajamesc

Plus driving style will not affect nox emmissions as a truck is only producing nox hard under load when it's pulling hard loaded

martysmartie

iTrader: (1)

Thats what I said?

By making maximum use of a given amount of Diesel, more Nox emissions are produced, modern Dervs don't do this from the factory for this reason, hence why they respond so well to a remap.

Thats why I was thinking the reason for the black smoke, perhaps as a lot of unburnt fuel is wasted.

Martin

ajamesc

id say modern dervs are very efficient a new euro 5 daf is a very clean engine they say the xf106 will do 10 miles per gallon at 42 tons which is very good for a truck
And to be honest you won't see a modern truck black smoking un less there's some thing wrong with it

martysmartie

iTrader: (1)

There not as near as good as they could be (Cars I am talking, but then you wouldn't remap a lorry ) that is why by remapping a derv you not only get increase fuel economy but gain power and torque as well, but the down side is an increase in nox emissions.

Martin

ajamesc

Some do re map trucks but its a waste of time on a daf as your warranty is void straight away lol plus it sticks out like a sore thumb as in the ecu variants there be lots of odd numbers
And daf aways bring out up dates so when you re program the ecu it's lost anyway

botters

iTrader: (2)

allthough diesels dont tend to rev high they do love a good rev and love being flat out, probably not best for mpg tho lol

JFB Tech

I think the latest EU rules have said that to meet the latest Euro emissions standards, trucks must run ad blue, even if the manufacturers have worked out other ways to meet the emissions targets. It was a similar story with cats on petrol cars, Ford and Peugeot had hit the emissions targets with lean burn technology but Brussels said they had to fit cats. Lean burn wasn't compatible with cats so they had to ditch the lean burn technology. Must have cost them a fortune, re-engineering everything.

ajamesc

Most can't meet euro 6 with just ad blue and will run ad blue and egr