[F500] sprockets?

[Gebhardt, Robert (R.)]

Width is the problem. The outside face (flat side) gets turned down.  If you go that route, get a small batch of them.  I usually go through a sprocket a year due to normal wear.  This year, I had the unfortunate luck of the car getting blasted by a Ford.  It twisted the chain off and blew the sprocket into smitherines.  

I don't remember what the width has to be, but i'm sure Sprocket specialists could tell you.  If you're really in a pinch, I could measure one of mine.  My new ones have needed a little polishing in the past though with a die grinder and a scotch brite disc to get the clearance right.  I could get you close enough though. 

I have run a 45 tooth driven and a 50 tooth driven.  I race at Waterford which is a pretty tight track.  I've found that on a 1.25" dia primary sprocket, 12 teeth is about the minimum for the chain to wrap around.  I'm running a 14/50 right now and the wear seems to be a lot better.  Something to think about if you'll need a low gear ratio. 

Bob



-----Original Message-----
From: f500-bounces+rgebhard=ford.com at f500.org
[mailto:f500-bounces+rgebhard=ford.com at f500.org]On Behalf Of Jeff
Blumenthal
Sent: Thursday, August 12, 2004 12:59 PM
To: f500 at f500.org
Subject: Re: [F500] sprockets?


Bob,
  What is involved in "turnng the Martin Sprocket down to 520 spec on a 
lathe"?  Is it tooth width? Height?
Thanks.
-Jeff Blumenthal

Gebhardt, Robert (R.) wrote:

>I run a 520 motorcycle chain and a custom sprocket from Sprocket Specialists.  The chain is a little over $100 (higher quality) and the driven sprocket is $35 or so.  The drive sprockets are martin gears.  The gears cost like $12, but need to be turned down to 520 spec on a lathe.  That's a pretty cheap operation as well.  I know one guy that had his jackshaft splined by micro-belmont to accept standard motorcycle sprockets.  I'll probably go that way myself this off season.  No more worries about set screws that work themselves loose or spread keyways. 
>
>Bob Gebhardt
>#36 Novakar
>
>-----Original Message-----
>From: f500-bounces+rgebhard=ford.com at f500.org
>[mailto:f500-bounces+rgebhard=ford.com at f500.org]On Behalf Of Jan Schmidt
>Sent: Thursday, August 12, 2004 12:37 AM
>To: f500 at f500.org
>Subject: [F500] sprockets?
>
>
>List,
>Anyone know which direction I need to look for converting secondary
>drive from belt to chain? Are these sprockets for carts, atvs,
>motorcycles, industrial. Most of them I have seen have a center hole
>that is 3 or 4 inches in diameter. My axle I believe is a 1 inch
>diameter.thanks.
>Bill Schmidt 88 Red Devil F440 Kawi
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