Starting and stopping diesel engines.

[euromodder]

Originally Posted by JanvdW

I tested the "theory", and got no assistance from the servo, at 400 000km and 14 years of service, the system may need some attention.

I can't get 3 stops from a modest 30-35 kph out of my 2005 Volvo - so much for the theory.
Tried it in stop & go traffic downhill, and had to stand on the brakes just to get it stopped the third time.
Good to know I'll only have one shot at stopping the car in an emergency though.

[jtbo]

Originally Posted by euromodder

I can't get 3 stops from a modest 30-35 kph out of my 2005 Volvo - so much for the theory.
Tried it in stop & go traffic downhill, and had to stand on the brakes just to get it stopped the third time.
Good to know I'll only have one shot at stopping the car in an emergency though.

That is really odd, I get three stops in my car (actually 3 of my cars) and it is general rule, minimum would be one full stop, imo.

But certainly better test that to be sure, also I think it could be possible to add vacuum reservoir of some sorts? That would improve safety of EOC for vehicles that fail to have enough vacuum reserves.

edit: I did check the law and it is two braking events that law requires at minimum. Your country may vary.

[pete c]

Diesels burn next to nothing at idle. Any restart adds some sort of wear and uses battery power, unless bump starting a manual.

Therefore, I would think that leaving it running for up to a minute or two makes sense.

[Piwoslaw]

Originally Posted by pete c

Diesels burn next to nothing at idle. Any restart adds some sort of wear and uses battery power, unless bump starting a manual.

Therefore, I would think that leaving it running for up to a minute or two makes sense.

My TD's lowest idle usage is 0.52-0.54 liters per hour after warming up and without extra loads. With lights, radio, ventilation, and/or A/C that can easily get to 0.80-1.20 lph. I've checked in 2-3 gassers with similarly sized engines that they have the same fuel consumption at idle, so it's about even. If one is worth shutting off, then so is the other.

[mechman600]

Originally Posted by Piwoslaw

My TD's lowest idle usage is 0.52-0.54 liters per hour after warming up and without extra loads.....I've checked in 2-3 gassers with similarly sized engines that they have the same fuel consumption at idle, so it's about even. If one is worth shutting off, then so is the other.

My buddy's 2006 VW 2.0T gasser shows 1.0-1.2 liters per hour fully warmed up, no extra loads. That's double the consumption of your diesel. That's significant.

[Frank Lee]

Originally Posted by pete c

Diesels burn next to nothing at idle. Any restart adds some sort of wear and uses battery power, unless bump starting a manual.

Therefore, I would think that leaving it running for up to a minute or two makes sense.

Everyone seems to think that and so we end up with everyone idling for waaaaay more than a minute or two. Always.

[skyking]

not going to disagree with you Frank. I do do my part, but you are correct. I observe far too many idling diesels.

[ron]

here in cal. our trucks at work have an auto shut off at 5 min of idling (the state side not the military)

[mechman600]

Most "Clean Idle Certified" HD engines require a 5 min shutdown timer. Cummins engines do not, as they idle clean enough to not require it.

[ron]

I may be wrong here but I think cal. has a law if you are not moving the engine is required to shut down after 5 min. for smog