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Author Topic:   Gear Drives
smallrock98
Member
posted February 27, 2004 03:51 PM
I picked up a Pete Jackson gear drive at a swap meet and was planning on racing with it this year. I read somewhere in this forum that what I should really be using is a fixed gear drive and not the floating type. I was just wondering why I should not use this type. What can happen?


2nd2none
Member
posted February 27, 2004 05:37 PM
your better off throwing that pete jackson away and buying a cloyes true roller timing chain.


smallrock98
Member
posted February 27, 2004 07:18 PM
Thanks, but, that is not even close to answering my question.


Ego Racing
Member
posted February 27, 2004 07:45 PM
I Have broken several chains but I have NEVER broken a gear drive and we ran them in an 8 second 1/4 mile rail.


outlawstock17
Member
posted February 27, 2004 08:16 PM
"floating idler" gear drives are hard on the cam bearings and valve train. the "on and off" the throttle characteristics of circle track racing causes the floating gears to " zero lash" and "re-zero lash" on the opposite side at least twice a lap. this makes timing erratic, among other things.

think of it like this.....with the idler gears floating, the cam gear and the crank gear are trying to "suck" the floating gears in between them when you're on the gas and "spit" them back out when you're off the gas. it's just a sloppy set-up. a fixed idler gear drive keeps the lash fixed at all times, keeping the timing stable whether you're on the gas or off it.

if this sounds confusing to you, maybe someone else can explain it to you better...



smallrock98
Member
posted February 27, 2004 08:38 PM
Not confusing one bit. It makes perfect sense. Thank you outlawstock17.


autoshop
Member
posted March 01, 2004 10:23 AM
What you have if you have too much lash between the two gears the dogbones are either worn out or they are spread out.You can contact Pete Jackson and get smaller dogbones to take almost all the lash out.If you live in the Los Angeles area stop buy his shop and he would give you a walk thru of his shop and then test the drive gears for free and give you new dogbones. He a very good guy to talk to.


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