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Rear tire size & gear ratio for Can-Am Plus?


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#1 usadar

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Posted 23 July 2014 - 02:24 AM

Kamo-san & I are going to discuss a ground design of Can-Am PLUS cars for our Gerding King in Tokyo.

We have never tried PS-4002 FK before.

Which rear tire size & gear ratio would be good for this new class?

 

Thanks in advance.

 

Haruki


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#2 Noose

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Posted 23 July 2014 - 06:51 AM

Try starting with .775 diameter and 9/28


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#3 S.O. Watt

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Posted 23 July 2014 - 01:39 PM

With a 28 T Parma Crown measuring in at .693", I think I'd try my 1st chassis with .790 tyres @ .050 clearance


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#4 MantaRay

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Posted 23 July 2014 - 01:44 PM

Thanks Tom, so what diameter jig wheel gives you that.......................


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#5 S.O. Watt

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Posted 23 July 2014 - 01:52 PM

Thanks Tom, so what diameter jig wheel gives you that.......................

 

One could use 28t Parma crowns or I believe that the Precision Jig wheels I have that are marked .812 & .790 just may be the ticket.


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#6 MantaRay

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Posted 23 July 2014 - 01:53 PM

Thank you Tom


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#7 JimF

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Posted 23 July 2014 - 01:54 PM

FWIW...................I just used whatever sized crown gear I wanted as a maximum (27) for my jig wheel, then put a strip of .025 brass under it. That gave me .050 with a .770 tire. Also FWIW, these motors are torquey suckers. I started with 7-26 on a shortish flat track and immediately went to an 8-26. On a big track......a 9t for sure. 


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#8 MantaRay

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Posted 23 July 2014 - 02:07 PM

good info


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#9 tonyp

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Posted 23 July 2014 - 02:34 PM

Tom, Me too.


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#10 MSwiss

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Posted 23 July 2014 - 03:08 PM

IMO, this class will eventually morph into a 26T only class...lighter gear,lighter tires,lower CG axle,less shaft offset if you run hypoid...unless I can talk Stu into making a 25T. Lol
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#11 tonyp

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Posted 23 July 2014 - 03:40 PM

I guess we will have to see how the motors run with the restricted 26 tooth spur gear.  You may not be able to find the sweet spot just changing pinions.  Time will tell.

 

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#12 usadar

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Posted 23 July 2014 - 07:04 PM

Thanks a lot for great advice & information.

I really like this kind of positive discussion at Slotblog.

Good Racing :victory: ,

 

Haruki


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#13 S.O. Watt

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Posted 23 July 2014 - 07:28 PM

Sitting here measuring Parma gears while whiling way some time waiting for traffic to clear, and if one were to use a 27t, .670", it would allow .770 tyres.

Not a bad place to start (I'm still sticking with .790 at 1st) but I still kinda need to look at roll out and try one of the motors.

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#14 Mark Wampler

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Posted 23 July 2014 - 08:18 PM

I've always said that Slot racing has the inherent quality and drive to go faster.  It will always be that way.  If this actually catches on, then the West Coast will again  have their own  version and it will specifically center around motor choice.  If this is supposed to be a bridge between AW/SCRRA Retro Pro and inline Can Am,  I'm not so sure CanAm racers will sign on with rebuildable   PS motors.   Once the door is open for motor building / refurbishing, we might just return to the demise of the 70's .  Motor building hasn't worked for us (Foster's) locally.  It hasn't worked for the bulk of BP racers, but I can't speak for them.  I'm looking for some SCRRA officials to weigh in    FK motors are what we run.  Its been that way since '06.  I'm sure all eyes are on what you guys do out east and more power to ya to keep the track doors open if it works for you :)  


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#15 Noose

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Posted 23 July 2014 - 08:54 PM

Mark the allowed motors are not refurbishable

Joe "Noose" Neumeister
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#16 usadar

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Posted 23 July 2014 - 08:58 PM

http://proslot.com/p...?part=PS-4002FK

 

Mark,

 

The above is info about PS-4002FK.


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#17 gotboostedvr6

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Posted 24 July 2014 - 09:02 AM

If someone was able to produce a bracket that had less flex 64 pitch gears would be the ticket.

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#18 Noose

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Posted 24 July 2014 - 09:21 AM

Dave, you don't need to use a bracket if you don't want to.


Joe "Noose" Neumeister
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#19 Mark Wampler

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Posted 24 July 2014 - 09:37 AM

Mark the allowed motors are not refurbishable

I have a difference in philosophy  about that, otherwise I'm very interested in this. 


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#20 Mark Wampler

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Posted 24 July 2014 - 09:40 AM

http://proslot.com/p...?part=PS-4002FK

 

Mark,

 

The above is info about PS-4002FK.

Thanks :)


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#21 Jason Holmes

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Posted 27 July 2014 - 10:19 PM

Mike 

 

You need to bend Stu's Ear and have him add 25,26,27 29 all will sell very well would love some 25's out here 

 

Jason



#22 gotboostedvr6

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Posted 28 July 2014 - 07:52 AM

cox made 24 tooth crowns

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#23 MSwiss

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Posted 28 July 2014 - 08:25 AM

cox made 24 tooth crowns

junk

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#24 Mark Wampler

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Posted 28 July 2014 - 04:33 PM

I have a few of those Cox gears.  They're fine with weak, slow (home track) motors.  I've never had one that could last a race otherwise. :mellow:


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#25 Mark Johnson

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Posted 03 August 2014 - 12:34 PM

Slot-it goes down to 23t  . metric gear pitch though .



#26 raisin27

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Posted 12 December 2014 - 04:54 PM

I ran a cox 25 tooth gear at the SANO with no problems.


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