I just acquired a used motor that has a red dyed arm in it and it is tagged SP.It has not been balanced I was wondering if any one may no the kind of arm this may be.thanks in advance.
Arm tagged with "SP"
Started by
hammerdown3426
, Oct 04 2014 07:18 PM
12 replies to this topic
#1
hammerdown3426
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Posted 04 October 2014 - 07:18 PM
Steve Nelson
#2
Bill from NH
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Posted 04 October 2014 - 07:36 PM
Sounds like it might be a Champion Sportsman. These arms, wound by Proslot, were available balanced & unbalanced. They're the same thing as a Contender.
Bill Fernald
I intend to live forever! So far, so good.
I intend to live forever! So far, so good.
#3
hammerdown3426
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Posted 04 October 2014 - 07:49 PM
Thank you.how would these compare performance wise to a 16d
Steve Nelson
#4
gotboostedvr6
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Posted 04 October 2014 - 08:41 PM
If its old and looks like it was wound by a blind guy it's about the same speed as current day 16d.
The new current production sportsmen arms are much faster then 16ds
The new current production sportsmen arms are much faster then 16ds
David Parrotta
#5
Bill from NH
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Posted 04 October 2014 - 09:46 PM
This SP arm is probably made for a C-can motor. If you have an empty D-can, stick the arm in it. If you have all kinds of end play, its made for the shorter C-cans.
Bill Fernald
I intend to live forever! So far, so good.
I intend to live forever! So far, so good.
#6
hammerdown3426
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Posted 04 October 2014 - 10:53 PM
Thank you both very much.it is in a c can now.all I have ever ran is 16d and s16d just wondering how this compared to those.thanks again
Steve Nelson
#7
Ramcatlarry
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Posted 05 October 2014 - 08:55 PM
A 16D arm is 70 turns of #30 gauge wire on a .600" long blank.
A group 11 Sportsman/contender/challenger/competitor is 55 turns of #30 wire on a .440" long blank. A little less flywheel mass and a hotter wind than a 16D. Many of these arms were sold as a hotrod 16d, but apples and bannanas should not mix.
A Super16D arm is 60 turns of #28 wire on a .500 long blank...much hotter and close to the #27 wire of a grp 20.
Larry D. Kelley, MA
retired raceway owner... Raceworld/Ramcat Raceways
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#8
hammerdown3426
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Posted 05 October 2014 - 09:13 PM
Wow thank you.I'm learning more and more about these motors.
Steve Nelson
#9
Samiam
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Posted 05 October 2014 - 11:13 PM
I remember racing a MURA Wasp in a C can back in the day. Same as a Contender/Sportsman ?
Sam Levitch
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"Fool me once, same on... shame on you. Fool me... you can't get fooled again."
George W. Bush
"If you have integrity, nothing else matters, and if you do not have integrity, nothing else matters."
Robert Mueller, special counsel (2013)
"... because people have got to know whether or not their president is a crook."
Richard M .Nixon, Nov 17, 1973
"Fool me once, same on... shame on you. Fool me... you can't get fooled again."
George W. Bush
#10
Ramcatlarry
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Posted 06 October 2014 - 11:18 AM
Group 11 - yes, Wasp is a shorter blank and different wind
Wasp and 12 are same blank dimensions; grp 15 and contender are same (longer) dimension.
Larry D. Kelley, MA
retired raceway owner... Raceworld/Ramcat Raceways
racing around Chicago-land
Diode/Omni repair specialist
USRA 2023 member # 2322
IRRA,/Sano/R4 veteran, Flat track racer/MFTS
Host 2006 Formula 2000 & ISRA/USA Nats
Great Lakes Slot Car Club (1/32) member
65+ year pin Racing rail/slot cars in America
#11
hammerdown3426
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Posted 18 October 2014 - 08:28 PM
So I ran this motor today in a race and it was a screamer.thank you all again for the help
Steve Nelson
#12
Ramcatlarry
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Posted 19 October 2014 - 04:03 PM
If it is one of the unbalenced ones, send it in to have it properly balenced and reconditioned. As an older arm, it likely has lower timing, higher torque, and a few less max rpms than a modern arm on the thinner web blanks...may be better in a drag class.
Larry D. Kelley, MA
retired raceway owner... Raceworld/Ramcat Raceways
racing around Chicago-land
Diode/Omni repair specialist
USRA 2023 member # 2322
IRRA,/Sano/R4 veteran, Flat track racer/MFTS
Host 2006 Formula 2000 & ISRA/USA Nats
Great Lakes Slot Car Club (1/32) member
65+ year pin Racing rail/slot cars in America
#13
John C Martin
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Posted 21 October 2014 - 07:41 AM
Sportsman arm
