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Dynamic Group 12 slot car


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#1 Slot Car Rod

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Posted 27 April 2023 - 11:04 PM

I remember when Ben Jones ran a Dynamic Group 12 slot car.  The car was one of Ben's favorites to run.  The car had good balance and handled great.  Eric inherited this car from Ben.  Eric also says the car handles great.
 
I went through the Oakland Speedway junkyard to find all of the Dynamic Group 12 chassis parts.  I was able to pick out enough undamaged pieces to assemble a chassis.  From looking at the scrap parts, it looks like the floppy pan arms and the floppy pan mounts on the chassis center section are fairly fragile.  The frame parts that were chosen were straightened out and assembled. 
 
 A Mabuchi motor with oval can holes and a red wire armature were installed.  A Dynamic angled spur gear, appropriate wheels and tires, and guide were installed.
 
A used, pre-painted McLaren Mk8 body was chosen.  The rear wheel arches and a crack in one of the sides of the body were repaired.
 
The car is a joy to drive.  It scoots around the track with neutral handling.  The Mabuchi motor supplies good power for the fairly light car.  The car weighs in at 5.2 ounces.  
 
dy3.jpg
 
dy2.jpg
 
dy5.jpg
 
dy4.jpg
 
dy1.jpg

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Rodney Chew




#2 don.siegel

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Posted 28 April 2023 - 02:40 AM

Great job Rod. 

 

Didn't think they would run that well without any mods. 

 

Don 



#3 Paul Menkens

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Posted 28 April 2023 - 12:46 PM

I have that same car (except for the body) mine has that same motor but I don't know as it's original to the car, the box says it has a "high performance ball bearing motor" and I can't see any sign of ball bearings (I have not taken it apart) I did not realize these were considered Gp12s,  there is no arm tag  and the box says just that it's a "super competitive, pro-formance slot car" it is an excellent handling car although when I got it I noticed the axles were out of tram (not parallel).



#4 brnursebmt

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Posted 28 April 2023 - 01:07 PM

That was the first slotcar I ever owned.  My brother bought it for me the first time he took me to the track.  

 

I was sold by Parma as a RTR.  I always thought the chassis was a Riggen. 


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#5 MSwiss

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Posted 28 April 2023 - 01:15 PM

Paul,
I think Rodney refers to these as Group 12's because there were a few $11.95 models that had Mura 2 hole can motors in them.

I don't remember if the motors were referred to as Group 12's.

 

My best friend who wasn't nearly as hooked on slot cars as I was, had one of these.

 

I'm pretty sure his was the $9.95 version with the Mabuchi motor and I was kind of jealous how well it ran.

 

Those Mabuchi motors did have some sort of frictionless bearing.

 

Edit;

Here's some further info on those cars.

 

Slot racing was pretty much dead in my area so I don't remember the Dynamic cars with this style body, and certainly not with the aluminum chassis and rectangular hole motor.

 

https://lascm.com/on...mic-racing-car/


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Mike Swiss
 
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#6 zipper

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Posted 28 April 2023 - 01:51 PM

the box says it has a "high performance ball bearing motor" and I can't see any sign of ball bearings (I have not taken it apart) 

 

They were 26D models with "ball bearings"  (very cheap pressed together I think) like this:  Professor Motor PMTR1527 Vintage Chrome Can FT-26D Mabuchi Motor NOS


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Pekka Sippola

#7 Bill from NH

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Posted 28 April 2023 - 01:51 PM

The Porsche "Aero-Dynamic" body was a popular East Coast open class wing car body in the early '70s once Lancer stopped making their Porsche coupe & before MAC began pulling it again, These Aero-Dynamic bodies were eventually replaced by the Lucas Matra until the O/S Ferrari came on the scene.


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#8 don.siegel

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Posted 28 April 2023 - 03:33 PM

I believe one of the last models of the Mabuchi 16D had a ball bearing similar to that on the 26D. 

 

Just checked the 1970 Auto World catalog and it lists both versions of this car, as Mike said: the Group 12 version with a Mura motor and the standard version with a 16D, but no more details on the motor. 

 

Don 


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#9 Slot Car Rod

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Posted 28 April 2023 - 04:13 PM

Group 12 rules first allowed motors like the Mabuchi oval can hole and ball bearing 16D and also 26D motors.  They had a high failure rate in racing.  This is documented in the old magazines.  Later, Mura and Champion came out with their Group12 motors and the price cap went up to around $12.95 for a Group 12 car from a previous cap of $9.95.

 

Model Car Science August 1970

gr12a.jpg

 

Mike and Don are correct.  Here is an Auto World 1971.  The same Auto World showed the cars with Mura Group 12 motors for $11.95.

gr12b.jpg

 

Couple of more pictures

gr12c.jpg

 

gr12d.jpg

 

Mura

gr12e.jpg


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Rodney Chew

#10 dc-65x

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Posted 29 April 2023 - 02:45 PM

Great post Rodney.   :good:

 

I have that same car (except for the body) mine has that same motor but I don't know as it's original to the car, the box says it has a "high performance ball bearing motor" and I can't see any sign of ball bearings (I have not taken it apart).........................

 

Here's a picture of the 1968 Mabuchi motor's cheapo ball bearing in the can. It has no inner race, just the balls running directly on the armature shaft and wearing a nice groove in it:

 

post-5-0-73993300-1628184591.jpg

 

This is it out of the can and the Champion bearing I usually replace it with:

 

post-5-0-59695600-1628184706.jpg


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#11 Bill from NH

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Posted 29 April 2023 - 03:09 PM

I called those & the 26D ones "Budweiser Bearings" because they looked like something made from a used beer can.  :laugh2:


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