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 Balance shaft weight
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melle
V4 Guru

United Kingdom
2253 Posts

Posted - 04 May 2017 :  17:12:20 Show Profile Visit melle's Homepage Reply with Quote
I wonder what the weight difference is between 1.5 and 1.7 balance shafts. I've weighed a few 1.7 balance shaft on more or less accurate kitchen scales and they all weighed in at 2014 grams (including the woodruff key). I didn't have accurate scales handy when weighing what I assumed was a 1.5 shaft, but it weighed roughly only 20 grams less. I'm confused: were my scales that inaccurate, did I accidentally weigh another 1.7 shaft or is the difference in weight between 1.5 and 1.7 balance shafts indeed negligible?

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Woody
V4 Guru

United Kingdom
2373 Posts

Posted - 04 May 2017 :  18:59:52 Show Profile Reply with Quote
I have understood that the balance shaft was common to both engines as it is stated in SS&R guide. Not sure what info in Saab W/S manual.
Now you have prompted the question, checking the parts book shows another shaft listed from 96.6000 /95095 for USA models. But why?
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melle
V4 Guru

United Kingdom
2253 Posts

Posted - 04 May 2017 :  19:10:41 Show Profile Visit melle's Homepage Reply with Quote
Because they had the 1.7 LC engine I suppose? You're right in that the S&R guide advises the lighter 1.5 balance shaft for tuned 1.7 engines, I guess to diminish reciprocating mass?

The 1.5 balance shaft is Saab part number 88 11 333 and Ford part number 405 885.
The 1.7 balance shaft is Saab part number 88 48 301 and Ford part number 436 208.

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melle
V4 Guru

United Kingdom
2253 Posts

Posted - 12 Sep 2017 :  16:11:46 Show Profile Visit melle's Homepage Reply with Quote
Right, I've weighed five balance shafts, all on the same scales as I used to weigh the 1.7 shafts I did earlier, and they all had different weights.



In the pic:
1928 gr. (no part number)
1990 gr. (part # 405 889 = 1.2-1.5 according to a '74 Ford parts book)
2024 gr. (also # 405 889 iirc)


All counterweights are identically positioned, but have different balancing holes drilled. I didn't have a known 1.7 balance shaft handy to compare the designs.




The other two I weighed didn't have part numbers and were 1930 and 1962 gr. (one had a woodruff key fitted, can't remember which one. The woodruff keys are 4-5 gr. apiece). Some have a date mark and they also have different stamped numbers like "8" or "14". This is something I noticed on camshafts as well, does anyone know what these numbers mean?




I'm stumped.

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