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  #1  
Old 03-15-2015, 06:15 AM
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CGI Girl Explaining CDI

Entertaining. I love her question at 2:18: "But why direct exhaust gas right back into the engine when it's just come out of there?" She makes it all sound so innocuous.

https://www.youtube.com/watch?v=zsm7C4-Es4g

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  #2  
Old 03-15-2015, 09:38 AM
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Cute...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #3  
Old 03-15-2015, 03:48 PM
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I thought Fiat developed CDI technology and made big bucks licensing it to M-B, and also gasoline direct-injection, which is how they had cash to buy Chrysler.

I understood the main efficiency of common-rail diesel is that they were able to eliminate the pre-chamber. By electronically controlling the injection profile (rather than just a spring poppet), they can keep the noise lower (reason for the pre-chamber). I didn't know that they measure and throttle the air flow (unlike mine). Much more complexity. I wonder what the parts cost and how practical it will be to maintain these for 500K miles. Time will tell.
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  #4  
Old 03-15-2015, 04:43 PM
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If MB's own record is any indication, the M119 guys replace electronic throttle actuators (ETAs) more frequently that I think is reasonable. How does TDI maintenance compare with IDI for VWs?

Sixto
MB-less
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  #5  
Old 03-15-2015, 05:23 PM
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Comparing the 1.9 IDI to the 1.9 TDI, the TDI is a bit more reliable, has more power, and gets better fuel economy. They are very closely related (the crankshaft is the same except for the sprocket design and CPS tonewheel on the TDI, the block is nearly identical. I think the camshafts might even be the same?).

The TDIs with watercooled EGRs (1997+) do suffer from intake plugging over time.

Both used the same serp belt setup, and both had a timing belt that needed replacement every 60,000 miles. The IDI motor's pump timing was set with a dial gauge, the TDI uses a computer tool.

The electronic and mechanical injection pumps both wear at about the same rate, and get leaky seals at about the same rate...

I'd venture that the TDI injectors last a bit longer. Both are dual stage.

The MAF used on the early 1.9 TDI is fairly reliable, the ECU uses it to limit smoke and check that the EGR is working. Neither has a throttle.

Now if you want to compare that to the current 2.0 TDI which has 16 valves, an air to water intercooler, injectors with up to 7 stages, glow plugs with pressure sensors to measure cylinder balance, an intake and exhaust throttle, 2 EGR systems, 2 oxygen sensors, 2 EGT sensors, a DPF + urea injection, and an ECU *much* more processing power... there is no comparison. Lots more to break. At least the timing belt is rated at 150,000 miles!

-J
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1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
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  #6  
Old 03-16-2015, 08:42 PM
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I've seen better graphics from a 90s video game
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1991 350SDL Blackberry Metallic (481)

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  #7  
Old 03-16-2015, 10:40 PM
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And a better story line...
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  #8  
Old 03-17-2015, 10:37 AM
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Quote:
Originally Posted by compu_85 View Post
Comparing the 1.9 IDI to the 1.9 TDI, the TDI is a bit more reliable, has more power, and gets better fuel economy. They are very closely related (the crankshaft is the same except for the sprocket design and CPS tonewheel on the TDI, the block is nearly identical. I think the camshafts might even be the same?).

The TDIs with watercooled EGRs (1997+) do suffer from intake plugging over time.

Both used the same serp belt setup, and both had a timing belt that needed replacement every 60,000 miles. The IDI motor's pump timing was set with a dial gauge, the TDI uses a computer tool.

The electronic and mechanical injection pumps both wear at about the same rate, and get leaky seals at about the same rate...

I'd venture that the TDI injectors last a bit longer. Both are dual stage.

The MAF used on the early 1.9 TDI is fairly reliable, the ECU uses it to limit smoke and check that the EGR is working. Neither has a throttle.

Now if you want to compare that to the current 2.0 TDI which has 16 valves, an air to water intercooler, injectors with up to 7 stages, glow plugs with pressure sensors to measure cylinder balance, an intake and exhaust throttle, 2 EGR systems, 2 oxygen sensors, 2 EGT sensors, a DPF + urea injection, and an ECU *much* more processing power... there is no comparison. Lots more to break. At least the timing belt is rated at 150,000 miles!

-J
How about comparing the 1.9 TDI to 1.6 IDI? 1.9 IDI was never imported to the US.
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  #9  
Old 03-17-2015, 10:55 AM
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Quote:
Originally Posted by funola View Post
How about comparing the 1.9 TDI to 1.6 IDI? 1.9 IDI was never imported to the US.
wasn't the eco 1.9 an IDI???
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #10  
Old 03-17-2015, 11:19 AM
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Quote:
Originally Posted by vstech View Post
wasn't the eco 1.9 an IDI???
There was never an eco 1.9 afaik.
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83 240D 4 spd manual- parted out then junked
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  #11  
Old 03-17-2015, 12:18 PM
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I thought it was a great overview of the hi tech injection system. For Vw, I had a 1.6 l them a 1998 Tdi , them a 2000 Tdi, them a 2004 Tdi 300d with pump injectors. They are all great engines. Same for Mb. The i6 cdi in my 2006 e320 is my favorite I've had for smoothness and power. I've never been able to make it smoke hardly at all even when I stomp on it though. Runs real clean. The mpg of the 1998 Tdi was the best. We clocked 53 mpg on a vacation to Florida. It was raining so we had to keep it at 65 mph

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