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I was just thinking back to changing a timing chain in my truck and it hit me that it doesn't have any sort of tensioner shoe on it, why does the twin cam need one?

Is it just the small thickness of the chain vs. it's length?
 

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Perhaps the Vtwin needs more exact cam timing to hold the performance we expect. The '06s have lighter chains & gears.

Kawi's 2000cc twin is very much like the H-D setup, it has real lite chains and a low redline.

Call H-D Customer service...
 

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I don't know the answer but it's a great question.

The newer ohc automotive engines that run chains use tensioners, but none of the older pushrod automotive engines (that I know of) use tensioners.

John
 

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For one, a cam with 16 lobes on it runs a lot smoother then a cam with two lobes on it.
 

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if you had a 2-4 degree timing shift in your old v8 for a 10%+ loss would you even notice it? now a 10%+ loss on a 50hp stocker you are going to notice besides any noise on a v8 is hidden by 10 feet and how many llayers of steel
 
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