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In the nick of time (Read 185 times)
verslagen1
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Re: In the nick of time
Reply #60 - 02/24/07 at 00:10:14
 
Hey, Justin

Here, this will help: http://suzukisavage.com/cgi-bin/YaBB.pl?board=RubberSideDown;action=display;n...

someday I'll do this too...
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Savage_Greg
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Re: In the nick of time
Reply #61 - 02/24/07 at 05:39:49
 
verslagen1 wrote on 12/31/69 at 16:00:02:
Greg thanks for the dimension but please one more...
with a chain wrapped around the top or bottom gear, what is the dimension from center to center between pins on the chain aka circular pitch.  There ought to be a 2:1 ratio between the 2, so give me one and I'll have the other.

And Justin, I love pict's, please post.


Mind ya that my measurement of the 2 gears could be off +/- 2 MM.  If I'd had the engine on a surface plate with a height gage, it would have been different.

Anyway, I'll get a measure on the cam gear later today.
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Savage_Greg
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Re: In the nick of time
Reply #62 - 02/24/07 at 15:46:35
 
verslagen1 wrote on 12/31/69 at 16:00:02:
Greg thanks for the dimension but please one more...
with a chain wrapped around the top or bottom gear, what is the dimension from center to center between pins on the chain aka circular pitch.  There ought to be a 2:1 ratio between the 2, so give me one and I'll have the other.

And Justin, I love pict's, please post.


Okay, here it is...Pin to pin chain on gear centers

Camshaft gear = 77 MM

Crankshaft gear = 39 MM
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verslagen1
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Re: In the nick of time
Reply #63 - 02/27/07 at 11:56:31
 
It's not a simple a2+b2=c2 problem.

I drew it out on the cad given the 325mm between crank and cam centers, 76mm and 38mm cam chain sprockets.  I made an estimate of tensioner position at 57mm above crank and 19mm radius around tensioner.

For 18mm tensioner deflection versus .07" stretch per 5" it came out pretty close.  Overall chain length for 18mm tensioner deflection is 781.7mm and 784.3mm for chain stretch.

BTW the calculated chain stretch equates to 6.8 cam lag.
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Savage_Greg
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Re: In the nick of time
Reply #64 - 02/27/07 at 18:56:54
 
That's pretty good work there.  I'll have to look at that.

6.8 deg cam lag?  Hmmmm.
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