Help with motor rebuild

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Jun 5, 2014 | 09:57 AM

#11

4boogie

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Cruiser

Joined: May 2009

Posts: 223

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From: Lafayette La

Thanks I told them just to go back stock 103 and I will play with it myself. Im thinking about ordering some cams 1st then maybe doing heads. I realy would like to get my hands wet on the motor end of things. I did a bunch of cosmetic things to my bike and had a blast doing it. I like the idea of getting rid of those cam chain tensioner so im thinking of getting the S&S gear drive cams 570 what do you guys think?

Jun 5, 2014 | 10:36 AM

#12

djl

HDF Community Team

Joined: Jun 2006

Posts: 12,774

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From: san antonio

Quote:

Originally Posted by 4boogie

The 570s are great cams by you will need head work and compression to maximize their performance. Personally, I would be boring to 107", sending heads out for porting and machine work, setting compression somewhere between 10:1 and 10.2:1.

There are two forum sponsors that have both built motors around the 570 cams; maybe they will chime in.

Jun 5, 2014 | 12:30 PM

#13

HD Bobber

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Joined: Sep 2010

Posts: 3,580

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From: Illinois

Quote:

Originally Posted by 4boogie

Not that simple to just pick a gear drive cam and slap it on. More than likely your crank will be out of tollerance to run gear drive...meaning you would have to split the cases and beef up your lower end and get it trued. Anything more than .003 and gear drive don't belong.

Jun 5, 2014 | 02:17 PM

#14

4boogie

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Cruiser

Joined: May 2009

Posts: 223

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From: Lafayette La

I did not know that guess I'm no where near ready have a lot to learn

Jun 6, 2014 | 07:16 AM

#15

Hillsidecycle.com

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A 107" at 10.0 cr with an S&S .570 cam set, combined with a good set of heads is a very cool-running, powerful combination.
Very smooth also.

Scott

Jun 6, 2014 | 08:49 AM

#16

djl

HDF Community Team

Joined: Jun 2006

Posts: 12,774

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From: san antonio

Quote:

Originally Posted by 4boogie

I did not know that guess I'm no where near ready have a lot to learn

Checking runout is a simple task. A good place to start to familiarize yourself with your vtwin motor. Google "Harley crank runout" and you will find more than you ever wanted to know about runout. Having said that, there is nothing stopping you from retaining the chain drive system and proceeding with your plan. The 570C is the chain drive version of the 570 cams. Roll on!