Starting and stopping diesel engines.

[Reloadwin]

Originally Posted by euromodder

Just about all European low CO2-emission (<100 g/km) cars now have stop-start systems.
Just about all of them are diesels.
They have improved starter-engines, though diesels already had beefier starter engines.

Don't kill it when it's still cold though.
Once it's warm, forget about yer old sayings, old habits.

Tell us more about the Diesel stop-start systems. Which manufacturers us them and in what models? Its very interesting.

[Milwaukee]

Before we argue.

Do you think about how much diesel parts cost?

$180 reman Starter for F350. THANK GOD for lifetime warranty.

It get 3-5 sec for oil pressure come on so I rather leave idle. It only use .30-.60 GPH at idle. Turn off and turn on it will go up 1.20 gph for about 20 seconds then start go lower.

[saphiro]

Originally Posted by Reloadwin

Tell us more about the Diesel stop-start systems. Which manufacturers us them and in what models? Its very interesting.

Agreed, I'd like to know this as well.
My input is that it's not worth shutting down for such a short period of time. But, then my experience is with an older diesel, and I certainly wouldn't do that to an old Turbo-diesel.

[slowmover]

There is -- at least according to one recent press release -- a stop/start system planned for at least one line of trucks by one manufacturer in the works. I'd admit that a factory system would have my attention. But I'd not be willing to be first by any means.

[Duffman]

Originally Posted by Tesla

Is it really 1 minute to get out and press a button and get in and drive on?
My vote is less than 1 minute leave it running.
1-3m, whatever you think is appropriate.
More than 3min, shut it down.

+1
It is easy for others to spend your money on turbos, starters and batteries.

[Diesel_Dave]

There's a variety of diesel technology out there and it's important to distinguish between the different technoologies. First off, let's cover the turbo issues. Historically, turbos were fixed geometry/wastgated and used only oil to cool them. The issue with a hot shutdown there is that when the engine stops so does the oil flow, so the oil near the hot metal of the turbo can coke up. This is because of all the heat that's stil in the metal of the turbo and the fact that oil won't thermal siphon very well. Many modern diesels (but not all) have variable geometry turbos with electronics attached. The electronics require much more cooling, thus engine coolant is used for cooling in addition to oil. The coolant won't coke up like the oil will, and will also thermal siphon so that the oil doesn't coke. So hot shutdowns with oil-cooled turbos are a no-no, whereas it's fine for one with coolant cooling.

Now, as far as aftertreatment goes, this varies greatly with the specifc engine. Whether you have EGR, SCR, DPF, NOx adsorbor, etc. The tuning is also very different for different applications. In some cases almost all the DPF regenerations are done "passively", i.e. no extra fuel required. In other cases "active" regenerations are required. Some applications also have special "warm up" modes that they'l go into to keep the SCR warm, and/or do a DPF regen. It's impossible to make a blanket statement the "Modern diesels all work this way..."

[Piwoslaw]

Originally Posted by Reloadwin

Tell us more about the Diesel stop-start systems. Which manufacturers us them and in what models? Its very interesting.

• Audi A2 "3L" with 1.2 TDI
• VW Lupo "3L" with 1.2 TDI
• Citroën Nemo with 1.3 HDi
• Peugeot 308 and 508 with 1.6 e-HDi
• Renault Scenic with 1.5/1.6 dCi
• Kia Cee'd with 1.6 CRDi
• Škoda Octavia, Superb and Yeti "GreenLine" with 1.6 TDI
• BMW 118d
• Mercedes-Benz E200 CDI

There are enough Start/Stop-equipped cars in Europe that the special batteries for those systems are now easy to find.

[euromodder]

Originally Posted by Reloadwin

Tell us more about the Diesel stop-start systems. Which manufacturers us them and in what models? Its very interesting.

Just about all manufacturers.
Stop-start has gone mainstream.

Adding to the list of manufacturers :
Volvo, Mini, VW, ... well, just about all of 'm.
Not just on small diesels BTW - you could get a 3.0L BMW diesel with start stop system.

I'd be surprised if it caused lubing issues in a modern diesel engine.
Surfaces will already have been oiled by then, so there'll still be a film of oil on them. Can't compare a restart with a cold start.

[serialk11r]

Originally Posted by euromodder

Just about all manufacturers.
Stop-start has gone mainstream.

Adding to the list of manufacturers :
Volvo, Mini, VW, ... well, just about all of 'm.
Not just on small diesels BTW - you could get a 3.0L BMW diesel with start stop system.

It's not mainstream at all among American or Japanese manufacturers :/
I have a ton of respect for BMW (really German manufacturers in general) as they really pack a ton of sophisticated stuff into their drivetrains, I hope this makes the Japanese consider upping the level of tech in their engines!

[BrianAbington]

I agree with what has been said earlier about EGT's being lower. Coking really only occurs in a turbo that has just been run really hard above 1,000 degrees and shut off with no cool down time at all. if your driving like a granny your turbo probably won't ever spool up so you won't have any worries about heat soak.