tdi question...no glow plugs? - Page 2 - PeachParts Mercedes-Benz Forum

DieselAddict · #16 12-29-2005, 06:06 PM

Quote:

Originally Posted by Krueger

I guess I answered my own question - up until last year when the CDI was introdcued, all MB diesels were indirect. The point in my original message then holds. VW and American made diesels perfected the glow system before MB - due to the fact of direct injection diesels.

I wouldn't criticize the IDI system. MB was the first to make a diesel passenger car and no one has more experience with diesels, or cars for that matter, than MB, though VW has a long history of diesels too. The IDI system of its time had some significant advantages over the DI system, namely quieter operation and higher maximum engine speed. It wasn't until a few years ago that engineers were able to make DI engines quiet enough and with a decent redline. As far as American diesels, other than perhaps the Cummins and Duramax they are a joke, particularly GM's attempts at passenger car diesels in the 70's.

DieselAddict · #17 12-29-2005, 06:12 PM

I might also add that if you want to speed up the glowing process for your IDI diesel, consider getting a new glow plug relay. Nowadays they come with afterglow which significantly cuts down on necessary preglowing.

Palangi · #18 12-29-2005, 06:27 PM

Quote:

Originally Posted by DieselAddict

I might also add that if you want to speed up the glowing process for your IDI diesel, consider getting a new glow plug relay. Nowadays they come with afterglow which significantly cuts down on necessary preglowing.

Huh??

DieselAddict · #19 12-29-2005, 06:36 PM

Which part did you not understand??

Palangi · #20 12-29-2005, 06:45 PM

Defies laws of physics.

How does "afterglow" speed up the glowing process? Even if you change the relay, you are still applying the same voltage across the same resistance(s), therefore will heat at the same rate.

By definition, afterglow happens after starting. That would be why it's called after glow.

coachgeo · #21 12-29-2005, 07:02 PM

Quote:

Originally Posted by dataiv

... I currently have the head off my Jetta ....

Take a picture of the top of one of your pistons please. Would like to see the design/shape of the top of the piston. I assume it is concave.

dataiv · #22 12-29-2005, 07:05 PM

Quote:

Originally Posted by coachgeo

Take a picture of the top of one of your pistons please. Would like to see the design/shape of the top of the piston. I assume it is concave.

Nifty design, actually. I would have guessed a concave shape too.

DieselAddict · #23 12-29-2005, 09:06 PM

Quote:

Originally Posted by Palangi

Defies laws of physics.

How does "afterglow" speed up the glowing process? Even if you change the relay, you are still applying the same voltage across the same resistance(s), therefore will heat at the same rate.

By definition, afterglow happens after starting. That would be why it's called after glow.

Are you just overanalyzing my choice of words or do you really not know how afterglow works? With afterglow, you don't have to preheat your glow plugs as long before starting the engine, thus speeding up the process.

Palangi · #24 12-29-2005, 09:13 PM

Quote:

Originally Posted by DieselAddict

Are you just overanalyzing my choice of words or do you really not know how afterglow works? With afterglow, you don't have to preheat your glow plugs as long before starting the engine, thus speeding up the process.

Nonsense, sorry.

The only way you get faster glow is more voltage or less resistance. You don't get either of those from an afterglow relay, or any other kind of relay.

Afterglow means the glow plug voltage stays on after starting. This is done to reduce stumbling (engine miss) immediately after starting.

DieselAddict · #25 12-29-2005, 09:24 PM

OK Mr. Anal, how's this: With afterglow, you don't have to preheat your glow plugs as long in order to have a smooth idle, thus saving time (or speeding up the process). Gee....

Palangi · #26 12-29-2005, 09:32 PM

No need for name calling, in fact, it's frowned upon here.

One of the best features of MercedesShop is that if someone puts out bogus information, it gets corrected, so people don't end up with incorrect technical information.

If you prefer incorrect information, you can find it at Benzworld, where almost every thread has uncorrected technical information.

DieselAddict · #27 12-29-2005, 09:36 PM

Are you just having a bad day or what?

Palangi · #28 12-29-2005, 09:39 PM

Quote:

Originally Posted by DieselAddict

Are you just having a bad day or what?

Nope, are you?

Diesel Giant · #29 12-29-2005, 09:41 PM

Yes the tdi has glow plugs, yes they are always used by the ECM before starting. No your tdi will start without letting them glow unless its really cold. Yes some models have afterglow at a certain temp.