Quote:
Originally Posted by Frank Reiner
The gear ratios of that box were intended for use with relatively small displacement gas engines, that have low torque at low RPM.
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That's one reason I was looking into getting one from Europe. They were found on the 2.2L CDI engines in the C203. I figured that would be a decent analog.
Quote:
1st gear is very short - 4.46:1
2nd is rather tall - 2.61:1
6th is .84:1
You would use a 3.46:1 final, and in 6th would have an overall ratio of 2.9:1; not too bad, actually. However, starting in 1st would be an overall ratio of 15.43:1, which is very short for an OM603. If you started in 2nd the overall ratio would be 9.03:1, a bit tall for other than level ground.
A gearbox with an ~3.75:1 first, and an ~.81 top gear would work much better.
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I would love to know where you go the gearing for the 716.6, the numbers I got were:
1_5.014
2_2.831
3_1.789
4_1.256
5_1
6_.828
I know there's supposed to be a different gear spread between the 716.60/64 (spread of 6.1), 716.62 (5.5) and 716.66 (5.3). I'm thinking I have the numbers for the 716.60 and you have the gearing for the 716.66.
I was planning on using the w123 differential with either the 3.07 or the 2.88. With the 2.88 and your first gear (4.46) it would give me a overall of 12.8. Do you think that would be decent?