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      11-03-2005, 02:00 PM   #1
Broken1
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Diesel Engines

Okay, So I've been happily driving my 320d for almost 5 months now, and since the new car "whoopies" are wearing off, me and my car are getting better aquainted.

I've spent alot of tonight reading a FAQ on TDI's which speaks mainly of VW TDI's using direct injection. My car uses common rail technology if I understand correctly...

the TDI FAQ also mentions that diesel engines don't have spark plugs? That's rather interesting...

Can any diesel heads shed some light on the diesel engine, or point me towards a website that does? (Particularly BMW's and not VW's)

Out of interest, the site I am reading is tdiclub.com/TDIFAQ

Thanks....


Another interesting point the site mentions... Diesels engines do NOT heat up if left to idle.... who knew? Is this true for the BMW?

I want to know more about my car...
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      11-03-2005, 02:01 PM   #2
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What type of information are you looking for?
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      11-03-2005, 02:09 PM   #3
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Quote:
Originally Posted by Frank_NJ
What type of information are you looking for?
Any interesting information on the workings of the BMW Diesel engine - what makes it different to a petrol engine etc...anything really that relates to my E90's diesel engine...


How the pistons works (apparently on compressed air and no spark plug?)

Intercoolers? Turbo charges?
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      11-03-2005, 02:12 PM   #4
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http://auto.howstuffworks.com/diesel.htm

Really well written primer.
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      11-03-2005, 05:30 PM   #5
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You have a Turbo Charger, with variable vanes
You have a Intercooler
You dont have spark plugs, diesel self ignites due to high compession, but you hvae glowplugs to help when engine is cold

You have a diesel catalitic converter

Your fuel pressure is about 1,600bar



A BMW 4 Cylinder Diesel Engine
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      11-03-2005, 07:22 PM   #6
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Diesel motors are compression motors that don't require spark plugs. Since the motor compresses the air so much (so hot) with aid of a VNT turbo, all that the hot air needs is some fuel to ignite it. Diesel motors don't have such violent explosions during combustion like traditional petrol motors, but rather a softer flame-up. This is why diesel motors can't rev super high. The glow plugs that you hear about are only needed when the motor is cold.
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      11-04-2005, 02:35 AM   #7
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Quote:
Originally Posted by E90Fleet
You have a Turbo Charger, with variable vanes
You have a Intercooler
You dont have spark plugs, diesel self ignites due to high compession, but you hvae glowplugs to help when engine is cold

You have a diesel catalitic converter

Your fuel pressure is about 1,600bar
Thanks

Now....with this common rail thing? Is that how the fuel is sent to the chambers? What about direct injection? (Does the BMW use direct injection in the diesels)?
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      11-04-2005, 03:21 AM   #8
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Quote:
Originally Posted by Broken1
Thanks

Now....with this common rail thing? Is that how the fuel is sent to the chambers? What about direct injection? (Does the BMW use direct injection in the diesels)?
Yes, BMW has been using Direct injction in diesel cars since about 1998. Thats why the piston is shaped so funnely in the middle, to properly distribute the fuel.

What it means is the fuel is injected directly into the cylinder, and not into the air intake manfold just before the valves like the older engines do.


Here is a bit on Common rail technology http://www.swedespeed.com/news/publi...inter_272.html

Your car has 2nd Generation common rail as far as I know
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      11-15-2005, 07:17 AM   #9
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Quote:
Originally Posted by voltron1011
Diesel motors are compression motors that don't require spark plugs. Since the motor compresses the air so much (so hot) with aid of a VNT turbo, all that the hot air needs is some fuel to ignite it.
That`s why diesel engines are much heavier than petrols (rigid cast, thicker walls) and they take longer to heat up to normal temperature.

You wont notice that since every modern diesel has built in an additional (auxiliary) heater.

My dad had a 2001 530d (navi professional) without the optional auxiliary heater with remote ( 1200).
A buddy BMW service technician told us, every BMW diesel has the additional heater built in which can be upgraded as fully stand-alone auxiliary heater. And the best:

It was only a software update! Now you can fully operate it from the navi screen, you just have no remote.

So why does the heater cost extra 1xxx on every BMW, either petrol or not?
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      11-16-2005, 06:32 AM   #10
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Dante, I'm curious to know more about this aux heater that's part of all diesel engines, and can just be programmed. I'm getting an E90 diesel in the UK soon, and here they don't offer the aux heating option. (Don't understand why not as it's pretty cold ).
So if it's just a programming issue, could I still get it.
Or is that option dealer fitted? If so, I could get it fitted at a German/Dutch dealer at a later date.
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      11-16-2005, 11:30 AM   #11
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Quote:
Originally Posted by shabs
Dante, I'm curious to know more about this aux heater that's part of all diesel engines, and can just be programmed. I'm getting an E90 diesel in the UK soon, and here they don't offer the aux heating option. (Don't understand why not as it's pretty cold ).
So if it's just a programming issue, could I still get it.
Or is that option dealer fitted? If so, I could get it fitted at a German/Dutch dealer at a later date.
Damn, it really can be cold in the UK (I love travelling London)

Hmm, not sure about e90. Which engine do you get? And are you going to order nav/i-drive? Because if not, I dont know how to operate the aux heater since you have no remote.

But I will talk to my friend over that issue, maybe he knows...

If he confirms I will start a new thread on this.
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      12-02-2005, 08:35 PM   #12
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Quote:
Originally Posted by E90Fleet

Here is a bit on Common rail technology http://www.swedespeed.com/news/publi...inter_272.html
i love that place too
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      03-05-2006, 01:03 PM   #13
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The advantage of common rail diesel injection over direct injection is the fact that you have less engine noise and reduces exhaust emissions even further. The diesel engine also has a much higher compression ratio compared to petrol engines. Diesel 17:1 Petrol 11:1. That is why some diesel cars needs oil replacement every 7500 km. Depending of the type of oil they use and the quality of diesel used they push up the service interval. The diesel engine weirs out the oil quicker because of the high compression and the high heat of the turbo charger. That is why the diesel engine oil is always very black, compared to petrol engine oil. It is not good to drive a diesel engine very hard and then just switch it off. You can damage the turbo charger if you do that (all that heat and then no cooling). The turbo also has variable vanes controlled by the engine management system. The BMW 320d is one of the most advanced, most powerful and most economical diesel engines in its size.
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      03-06-2006, 12:38 PM   #14
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Diesel is great for burning off/disposing of old dynamite. Just my $.02.
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