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Old 09-22-2004, 08:44 AM   #1 (permalink)
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250GD vs. 300GD

All things being equal 460 series SWB with 5-speed which is the preferred engine in terms of performance, reliability and economy?
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Old 09-22-2004, 12:11 PM   #2 (permalink)
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RE: 250GD vs. 300GD

The 300 would be the better engine simply because it has more power. It was about 88HP 5cylinder. The 240 was a 4 cylinder.
Both are fairly bullet proof if maintained and would run to 2-300,000 miles easily.
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Old 09-22-2004, 12:34 PM   #3 (permalink)
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RE: 250GD vs. 300GD

Quote:
engnenk - 9/22/2004 4:44 PM

All things being equal 460 series SWB with 5-speed which is the preferred engine in terms of performance, reliability and economy?
I guess that you referring to the OM602 (GD 250) and not, as Roly interpreted, to the OM616 (240 GD).

Both the OM602 and the OM616 are 5-in line naturally-aspirated diesels. Max power is 84 HP @ 4,600 and 88 HP @ 4,400 rpm respectively and torque is 157 Nm @ 2,200-2,800 and 172 Nm @ 2,400 rpm respectively, which should balance overall performance between the two.

The fact that the former is much more modern than the latter should mean better fuel consumption but this is apparently not the case.... the only published test of the 250 GD in SWB manual guise that I know of is that of the weekly Spanish magazine Autopista, which recorded a test consumption in it issue onf 22nd June 1989 of 15.2/100 Km, or 18.55 pmg (imp), well over the 12.7 (22 mpg) that I achieved over the ownership of my trusty 1984 300 GD SWB.

In any event, the 250 GD is a much rarer animal than the 300GD, with just 2,402 units made of all civilian versions as opposed to the 20,583 of the 300 GD.

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Old 09-23-2004, 07:19 AM   #4 (permalink)
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RE: 250GD vs. 300GD

If it was me and I was in Europe I would be looking for one of those STT Diesel form Norway. That seems like it would be the best
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Old 09-23-2004, 07:31 AM   #5 (permalink)
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RE: 250GD vs. 300GD

The STT is a very good option, but an even better option would be the OM617A from the W123 300TDT.
This is a dedicated turbo engine and is easy to find, at least in Europe. It is the OM617 engine block, but with a different head and diesel pump. Retrofitting a STT kit to a old and run-in diesel could lead to unwanted wear and tear...
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Old 09-23-2004, 12:14 PM   #6 (permalink)
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RE: 250GD vs. 300GD

I think the 300GD is still the better choice.
The 300GD has a "longer" axle ratio (4.88) than the 250GD (6.17)
That's why the fuel economy is not better than on the 300GD. The 250GD has to turn much faster to get the same speed. If you are off-roading you might appreciate the shorter axle ratio, but for travelling on the road the 4.88 axle is already quite short.
Downside of the 300GD: They are very popular = hard to find. And since the 250GD was only sold since 1987 there are some araound in really nice shape.

Still if you find a 300GD in decent shape and with 5-speed, go and grab it!
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Old 09-25-2004, 11:48 PM   #7 (permalink)
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Can you explain axle ratio?

Is this the gearing on the crankshaft where it emerges from the engine? If so, I guess that there is not much that I can do about it.
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Old 09-26-2004, 10:22 AM   #8 (permalink)
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RE: Can you explain axle ratio?

BR549,

Axle ratio is the gear ratio of the ring and pinion gears in the differential of the axle. There is a very sophistcated relationship between the power characteristics of a given engine and the gears between the engine and the tires (transmission, transfer case, axles)http://4x4abc.com/4WD101/crawl.html

here are the latest axle ratios:
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Old 09-26-2004, 10:25 AM   #9 (permalink)
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more about gear ratios

http://auto.howstuffworks.com/gear-ratio.htm
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