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Old 10-30-2017, 01:32 AM
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Camshaft timing M117

Still toying with the idea of adjustable timing gears but I did a little calculating using offset woodruff keys and moving the chain one tooth at the camshaft. One camshaft tooth=20 deg of camshaft timing(at the crankshaft). Offset woodruff keys are available in 4, 6.5, 8 and 10deg so the 10deg woodruff would be half of a tooth. So I should be able to achieve any timing I desire within a deg or 2 by using the correct offset and moving the chain one tooth + or - if the timing falls outside the range of the woodruff key. Am I correct?
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Old 10-30-2017, 08:19 AM
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That certainly makes sense for a constant + or - on your timing. Regardless of your RPM.

Somehow I was thinking you’d be looking at something more like this though. Does Mercedes do anything like this on any of its newer cars?

https://youtu.be/G6S4D14VS7w




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Old 10-30-2017, 11:46 PM
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That is way too advanced to implement on a 70's era engine. I'm just looking to correct/change the basic timing. measuring the cam hub diameter the math works out to .13mm per deg and the 10deg woodruff key is 1.4mm. I had my block decked and I'm using thinner head gaskets so my cam timing is going to be way off-beyond the range of offset woodruff keys alone.
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Old 10-31-2017, 02:03 AM
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The cams and gears are a pretty soft cast iron so if it were me..... I would make a jig that would allow drilling a dowel hole to pin the gear to the cam. Then set the cam timing by the valve lift specs (or whatever specs you want). Drill it and pin it.
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Old 04-11-2018, 04:40 PM
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The cam shaft is 18 degrees per tooth which might change your setting a bit.
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Old 04-11-2018, 05:13 PM
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Quote:
Originally Posted by Benz Dr. View Post
The cam shaft is 18 degrees per tooth which might change your setting a bit.

Camshaft gears have 36 teeth.

360 degrees divided by 36 = 10 camshaft degrees per tooth (20 crankshaft degrees); as Tony H correctly stated.
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Old 04-20-2018, 10:53 PM
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Wow-thanks Frank-I had to put some thought into the math. I did not think anyone was looking at this anymore. Project is on hold again-we are in the process of moving for the 2nd time in 1.5 years. using the offset keys and jumping a tooth if necessary will get the job done. The adjustable gears proved too impractical to produce one off plus I would always be concerned they would fail.
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