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Old 02-18-2012, 09:19 PM
JHZR2's Avatar
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Location: Collingswood, NJ
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Do we know the pulley ratios?

Want to check the engine speed in my 240d, which has no tach. Bought wine of the photo sensor tachometers, but am looking for the best spot to put the reflective tape.

Seems to me that putting the tape on a pulley is far easier than putting it somehow down on the crank pulley and then having to get a clear shot down so low.

I was thinking the black smooth round surface that the fan is attached to, as it is right up top, smooth, easy to clean and stick to, etc.

But then I need to be sure to know the ratio that the ratios are known to get an accurate reading.

Anyone know? Ideas?
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  #2  
Old 02-18-2012, 09:39 PM
sixto's Avatar
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Short of a straight answer, paint a tickmark on a more visible pulley then count rotations while turning the crank 5, 10, 15... times. Or take a tape measure to the pulley diameters.

Sixto
87 300D
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  #3  
Old 02-18-2012, 10:30 PM
JHZR2's Avatar
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Join Date: Jan 2002
Location: Collingswood, NJ
Posts: 3,434
Yeah, I know... Just so hard to access (need to make a big enough caliper that I can fit down there).

Was hoping it would be clearly given in some tech manual....
__________________
Own:
1981 240D (73K)
1982 300CD (162k)
1998 Chevrolet S-10 ZR2 (62K)
2011 BMW 135i cv (14k)
2014 Honda Odyssey (6k)
2015 Honda Accord Hybrid (5k)
Had:
2008 VW Rabbit (70k)
2004 SAAB 9-3 (83k)
1991 BMW 318i (183K)
1983 300D (228K) (wrecked by at-fault uninsured driver)
1985 300D (233K) (now in FL)
1994 Acura Integra (188k) (Rusted out)
1992 Toyota 4Runner (72k) (Rusted out)
1990 Daihatsu Rocky (??) (No parts)
Reply With Quote
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