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A not Vintage "C"


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#1 havlicek

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Posted 04 December 2017 - 05:26 PM

     Seems like, if I do too many vintage/old motors, people start thinking that's all I do.  This may not be exactly cutting-edge, but the potential for pulse-raising fun is definitely there.  Of the later C cans, I'm partial to the Mura and the RJR...maybe the RJR a little more than the Mura.  This RJR came from Bill Bugenis, and they come already formed and folded, but not spot-welded at the side seams.  I've brazed them before and that works surprisingly well, but seems unnecessary if the magnets are to be epoxied-in to the can, which is what I did here.  Before doing that though, I needed to establish a center by installing a can bushing/bearing.  These come with a 5mm bearing hole, but just because I like torturing myself, I reamed that out to 6mm.  Once that was done, a set of magnets with white dots on them (no doubt they're "White Dots"  :D ) got epoxied-in using a slug and while clamping the can sides into position.  After the epoxy set up, I ran a hone through the "hole" to make double sure everything was groovy.  All it took was a light touch.

     This setup will be good for everything from "mild to wild"...but I'm leaning more towards the wild side, maybe even a strictly drag stupid-big-wire arm.  I'll let the motor take me where it wants to!

IMG_2355.JPG


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#2 olescratch

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Posted 04 December 2017 - 07:29 PM

Did I miss it, are you putting a bearing in the eb also?


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#3 havlicek

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Posted 05 December 2017 - 06:17 AM

Did I miss it, are you putting a bearing in the eb also?

 

How come...do you want one?  ;)


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#4 olescratch

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Posted 05 December 2017 - 11:25 AM

Just curious at the moment!  Being destined to being on the stupid side, a bearing in the eb couldn't hurt. 


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#5 havlicek

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Posted 05 December 2017 - 02:24 PM

Just curious at the moment!  Being destined to being on the stupid side, a bearing in the eb couldn't hurt. 

 

Ohhhhhhh, I see said the blind man!  :)  Someday when I start getting close to what these motors are worth, I'll start loading them up!  :D


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John Havlicek

#6 havlicek

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Posted 05 December 2017 - 07:58 PM

...and BAM!  BIG wire, a #24 coming in at precisely .028 ohms on a .460" stack.  This motor will be brutal.

IMG_2356.JPG


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#7 Geary Carrier

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Posted 05 December 2017 - 11:26 PM

Danger Will Robinson...

 

Sweet...


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#8 havlicek

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Posted 06 December 2017 - 04:20 PM

Danger Will Robinson...

 

Sweet...

 

 

Thanks Geary.  This kind of power (watts) is generally the stuff of drag cars...BUT...a really brave SCM (*speed-craved-moron"...as Philippe would say), or just someone with a long enough memory, might put this in a road car for some tire-shredding fun.  ;)  I even dialed this one back a little, because I was originally going to do a #23 arm, but whenever I do something like that, I can almost hear Bill Bugenis letting out a "sigh".  ;)


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John Havlicek

#9 Geary Carrier

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Posted 06 December 2017 - 05:45 PM

Hi John,

 

I see that the length of armature stack is about 2 lams shorter than the length of the magnets, is this about the max length of stack vs magnet that you would use?

 

Thanks,

g


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#10 havlicek

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Posted 06 December 2017 - 07:40 PM

Hi John,

 

I see that the length of armature stack is about 2 lams shorter than the length of the magnets, is this about the max length of stack vs magnet that you would use?

 

Thanks,

g

 

 

This arm is made on a .460" long stack, and that's about the max length I would ever use on typical C can magnets.  I always want to see the arm shorter than the magnets, but don't have any specific "formula", although I've seen people say slightly different things about this.  Of course, many arms are MUCH shorter than the magnets.


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John Havlicek

#11 Geary Carrier

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Posted 06 December 2017 - 07:47 PM

Thanks John...


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