Quote:
Originally posted by P.E.Haiges
Diesel power:
By you theory of using the GP for only 15 seconds so that the head would not act as a heat sink, then you should use GP for only a fraction of a second so no heat would be sunk.
This is of course ridiculous because the longer the GP are on the warmer it gets inside the pre chamber where the combustion starts. That's why the GP relay stays on for more than a minute.
P E H
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Maybe these cars act differently. I'm new to MB cars. My experience is as follows:
99 Dodge Ram Cummins Turbodiesel. Preheat system consist of heating grid in intake. When the light shuts off, the grid shuts off. Grid cycles on and off during the first few minutes of warmup. You can watch this cycling at night as the lights dim when the grid comes on.
81 Datsun 720 pickup with the SD22 diesel. When the light shuts off, the glow plugs shut off. You can hear the relay cut off. Glow plugs cycle back on after engine started for a minute or two.
83 VW Rabbit turbodiesel. I had injectors out of engine to have them tested. Checked glow plugs for proper operation right then. When the light shut off, the glow plugs cooled off.
I would have expected MB cars to behave similarly. Shutting down prevents unecessary wear to the GP's, and unecessary drain on the battery. I will verify this with a voltmeter later on my 240D and post the results.