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Captain Rick's 2nd Race GT Coupe


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#1 dc-65x

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Posted 06 August 2014 - 03:43 PM

I'm smitten with Mike Steube's 2nd GT race winning chassis:

 

MRJV1N9p7-cartop.jpg

 

It's got 3 main rails per side......ALL BRASS..........yum.........shinny goodness!

 

MRJV1N9p7-carbottom.jpg

 

Powered by a Mura A-can (16D) motor:

 

MRJV1N9p7-carmotor.jpg

 

It will be a while before I can get started on the chassis but I couldn't resist pulling the parts for it:

 

AlfaT-33Build-2.jpg

 

We'll have wheels inserts like the concours cars pictured in the MCS articles, Steve O and my repop Riggen AA wheels, Riggen Orange donuts, Cox 34T spur gear, Dynamic 7T pinion gear, Marklin train wire, Phase III motor bracket, modern axles and ball bearings, and a Team Nutley drop arm.

 

There are 2 bodies I like but I'm not sure which one to use yet. I've got a Dynamic Alfa T-33 GT...........

 

AlfaT-33Build-4.jpg

 

AlfaT-33Build-.jpg

 

.........and a Russkit Marcos Mantis XP:

 

AlfaT-33Build-5.jpg

 

This ones a TrueScale repop that beautifully done:

 

AlfaT-33Build-7.jpg

 

I'm still working on motor parts........ :dance3:


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Rick Thigpen
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#2 SlotStox#53

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Posted 06 August 2014 - 04:05 PM

:D :heart: I just love it when you start pulling parts for a new build Rick!! It's literally like you stepped straight into one of the adverts in the slot magazines back in the day :D

 

That Dynamic Alfa is really nice :good:  Although the Marcos could make quite a cool looking car..

 

Still building a Dragster for the September race so can't start one of these till I've got that one done :laugh2: Although I have got "some" parts that I could start a thread ..... May just have to dig out the parts I know I can use.



#3 dc-65x

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Posted 06 August 2014 - 04:17 PM

 

Still building a Dragster for the September race so can't start one of these till I've got that one done :laugh2:

 

Me too!

 

Rodney and I talked about this race series during the R&C Event and I haven't be able to get it out of my mind.


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#4 SlotStox#53

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Posted 06 August 2014 - 04:36 PM

The drag car events are quite addictive!! :D 

 

Heck got several more to build including 2 of Ricks lovely new Rail kits .. Not all for September , gonna try and not rush build or have to express ship in the dying moments this time :laugh2:

 

One thing I've never seen the Alfa body before, never knew Dynamic did one. Gonna have to look into bodies that were around in '69... Oh and get Steve's DVDs .



#5 dc-65x

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Posted 06 August 2014 - 05:10 PM

Hi Paul,

 

I almost forgot to post this body list:

 

1969 MCS/USRA Road Race Body List


Rick Thigpen
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#6 SlotStox#53

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Posted 06 August 2014 - 05:23 PM

Thanks a Lot Rick !! Now to go study the race reports some more :)  & those tech charts for the motors.....



#7 dc-65x

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Posted 12 August 2014 - 08:51 PM

Ohhhhhhhhhhh.........I should be finishing my Proxy Drag Cobra but I can't stop fiddling with this build. :crazy:

 

I put together parts for a 2nd GT race Mura A-can motor:

 

MuraA-CanBuild-14.jpg

 

I changed my mind on the armature. I'm going to try this used arm:

 

MuraA-CanBuild-21.jpg

 

It's got a welded comm with wrapped wires and fiber lamination end plates instead of Mura's later green powder coating:

 

MuraA-CanBuild-20.jpg

 

Hopefully it's more or less appropriate. I seem to have a fair number of later powder coated arms and earlier soldered and non-wrapped arms but few of what I think I need for this motor.

 

I used the MRJ Mura "hop up" articles to cut up my motor. Here's my cyphering for the chop job and the pre-cut can and endbell:

 

MuraA-CanBuild-13.jpg

 

Chop job is up next................

 


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#8 SlotStox#53

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Posted 12 August 2014 - 09:00 PM

That arm certainly looks like it's pretty stout! See you're going for the "hacked" up can rather than the low CG "Exotic" touch ....

 

 Look forward to seeing what the old hop up articles produce with your expert touch :good:

 

Know what it's like trying to finish the Dragsters for the proxy and not be tempted to mess with the parts etc for these 1969 series beasts :laugh2:



#9 dc-65x

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Posted 13 August 2014 - 10:29 AM

Here Mr. Milling Machine makes quick work of hacking up the back of the can...........

 

MuraA-CanBuild-11.jpg

 

.............and notching the front:

 

MuraA-CanBuild-12.jpg

 

Here's a comparison of the "all cut up" can and a stock one:

 

MuraA-CanBuild-4.jpg

 

MuraA-CanBuild-5.jpg

 

MuraA-CanBuild-6.jpg

 

Mura's early "mondo" bearing needs to be cut up too:

 

MuraA-CanBuild-7.jpg

 

According to the "hop-up" magazine articles, you're supposed to polish the wee out of the bearing where the armature contacts it. I dutifully did so and now expect an increase in RPM by at least .00012% :laugh2:

 

MuraA-CanBuild-8.jpg

 

Next up are the "semi-can" and magnets.......


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#10 SlotStox#53

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Posted 13 August 2014 - 10:45 AM

Oh to have my own Mr Milling machine :D :laugh2:

Looks so much easier than messing with a dremel . Forgot how big those particular Mura bearings were, certainly shiny now!!

#11 dc-65x

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Posted 13 August 2014 - 09:05 PM

Hi Paul,

 

I don't know if Mr. Milling Machine is really easier than using a Dremel, but it is different. With the Dremel it's all user hand-eye coordination and skill. With the mill it's mostly the skill in the setup. Once the workpiece is properly clamped down and located accurately under the cutting tool then comes the easy part of turning the dials and letting the machine do it's thing.

 

I enjoy using both tools. :dance3:

 

For these motor mods I gave Mr. Milling Maching the nod. Here he is "cutting up" the endbell comm inspection holes........

 

MuraA-CanBuild-10.jpg

 

..........and cutting the cooling slot:

 

MuraA-CanBuild-9.jpg

 

Here's a comparison between a stock endbell on top and the "cut up" one on the bottom:

 

MuraA-CanBuild-2.jpg
 

Another mod is to solder the hex brush holders to the brush hoods as shown on the right:

 

MuraA-CanBuild-.jpg

 

The finished endbell:

 

MuraA-CanBuild-22.jpg

 

MuraA-CanBuild-23.jpg

 

Magnet time is next.........


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#12 SlotStox#53

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Posted 13 August 2014 - 10:00 PM

Another superbly modified endbell Rick :good: Never get tired of seeing the task soldering the heatsinks/holders to the hoods ...

 

On a side note,  I followed your advice :D a newly aquired B can motor is currently winging its way to HQ for evaluation, older type with the 2 round holes .



#13 Bill from NH

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Posted 13 August 2014 - 10:29 PM

One step I take before polishing oilite bushings is to burn all the dirty cutting oil out. I use an old Ungar tip to put the bushings on until they stop smoking. Can bushings, I solder in dry then add clean oil while still hot. Endbell bushings are dropped in clean oil when they stop smoking. :)


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#14 dc-65x

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Posted 14 August 2014 - 11:03 AM

Hi Paul, good luck with you B-motor acquisition. Hope she's a good'un!  :good:
 
Bill, I've read about heating oilite bearings to get the cutting oil out too. But looking at these Mura bearings, especially the splines on the O.D. of the endbell bearing, I wondered how they are made. Did they really machine that shape with cutting tools? :unknw:
 
I did some snooping and found lots of different answers. :wacko2:
 
Here's one that might make sense, it's from NSK's "Oilite Bearing Design Guide":
 
Oilite bearing products are made by the P/M process,
with close controls on materials and manufacturing to
produce the premier self-lubricating bearing. With the
emphasis on quality throughout the process, we
produce Oilite bearings with large interconnected
pores vital for the channeling of lubricants to areas
between the shaft and bearing. At rest, the capillary
action will recover lubricant from the surface and
replenish the reservoirs. This porosity feature of Oilite
is the most sought-after quality of our bearings.

THE P/M PROCESS:

Fine powders are combined and blended into a mix
and are compacted in a die under high pressure. The
compacted parts are sintered at high temperature in
a protective atmosphere belt furnace. Sintered parts
are then sized to obtain the exact dimensions and
close tolerances desired. The final step in the P/M
process is vacuum impregnation of the bearings, or
filling the pores with lubricant.


I don't know if this is the way the Mura bearings were made or not but heating them to remove 40+ year old oil and replenishing with fresh oil might not be a bad idea. :)

 

For sure when I'm soldering in an oilite can bearing I avoid at all costs getting acid flux down the old blow hole........I mean bearing hole.   :crazy:  Even when I've flooded a hot bearing with oil after acid got down the hole it's come back to haunt me with a corroded armature shaft.  :shok:


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#15 dc-65x

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Posted 14 August 2014 - 09:02 PM

Well, :boredom:   I guess I'll forge onward and finish up the motor with the magnets and shims. :unknw: I'll be brief.....

 

Here are the parts used and a modern aid, the wonderful armature alignment tool:

 

MuraA-CanBuild-1.jpg

 

Magnets get JB Welded into the semi can and then honed to size and in line with the bearings with another wonderful modern tool, the magnet hone:

 

MuraA-CanBuild-16.jpg

 

Then I cut off the unnecessary crap-O-la on the back of the semi-can shim. It just gets in the way with a can drive setup:

 

MuraA-CanBuild-15.jpg

 

They get a good zapping from "TheBig Dog":

 

MuraA-CanBuild-17.jpg

 

Here's how it looks in the modified can:

 

MuraA-CanBuild-18.jpg

 

MuraA-CanBuild-19.jpg

 

And that's it until I'm done using it as a jig motor for the chassis build. Then it will "go to paint" and final assembly.


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#16 SlotStox#53

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Posted 14 August 2014 - 10:29 PM

First class motor building Rick :good:

That bare A can with the finished semi can shim & magnet setup looks beautiful :heart: :D

What size are those Certus shims? Will look at making some for another motor build & they look perfect.

Certainly a lot of gap/fresh air underneath the mags with the standard semi can shim/mags & clips :laugh2:

#17 Mark Johnson

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Posted 29 September 2018 - 01:37 AM

That motor now has soul , love the  mods on the endbell also .



#18 dc-65x

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Posted 29 September 2018 - 12:38 PM

Thanks Mark,

 

I've got the motor set aside for an appropriate project. The whole 1969 MCS/USRA Road Race Series topic stalled out.............. :unknw:


Rick Thigpen
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