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PvA 'blue King' record-setter inspired build


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#1 dc-65x

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Posted 18 January 2022 - 07:19 PM

In November 1969 the late great Pete von Ahrens set a world record on the Blue King track with my favorite can motor of the 60's, the Mura B-motor. Yes I know, overall it was not that successful of a motor but I also love King Cobra and Honker Can Am's and of course........the Bill Thomas Cheetah.  :crazy:

 

Below is a link to a great thread by PdL on the car and the restoration of it:

 

AMCR "Blue King" record setter

 

Here is how the chassis looked in the January 1970 Model Racing Journal race report. Click on the photo to enlarge it:

 

MRJ V1N21 p8 jan 9 1970.jpg

 

It was rediscovered and 50 years and taken their toll: (photo courtesy of LASCM):

 

post-22-0-05988200-1540602628.jpg

 

Steve Okeefe worked absolute magic restoring it to its former glory (photo courtesy of LASCM):

 

PvA King Record Car (7).jpg

 

PdL also worked magic restoring the complete car back to as raced (photo courtesy of LASCM):

 

PvA King Record Car (9).jpg

 

Here is the race report in MRJ, "Von Ahrens Breaks All Records At CM":

 

MRJ V1N21 p1_small.jpg

 

MRJ V1N21 p6_small.jpg

 

MRJ V1N21 p7_small.jpg

 

Time to start building a B-motor car with a square wire chassis.   :dance3:

 

 

 


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#2 Bill from NH

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Posted 18 January 2022 - 08:41 PM

If I remember correctly, an issue of Car Model has a PvA chassis build article. Not this chassis, but either another flat wire chassis or at least partially flat wire.


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#3 dc-65x

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Posted 18 January 2022 - 09:41 PM

Here's the article Bill from Steve Okeefe's sub-forum. It's earlier likely mid 1969 when actually built, but still a very cool PvA design.

 

PvA Shows You How To Build The Latest 1/24 Open Class Chassis


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#4 dc-65x

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Posted 19 January 2022 - 11:35 AM

I put the wrong page of MRJ up in my first picture of the thread. It correctly shows the PvA car now.....sorry!


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#5 dc-65x

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Posted 19 January 2022 - 05:14 PM

Here's what I've found for my chassis. PvA offered his own line of parts. Here is his ad from Model Racing Journal in October 1969:

 

MRJ V1N19 p8 oct 29 1969.jpg

 

I have this cool drop arm:

 

pva chassis (2).JPG

 

Also have these half rails:

 

pva chassis (1).JPG

 

I'm thinking I'll try these Parma pans:

 

pva chassis (3).JPG

 

Cobra low profile motor bracket:

 

pva chassis (5).JPG

 

And finally what really makes building this chassis possible is Cobra .050" SQUARE wire. The label says flat wire but it is actually .050" X .050" square same size as PvA's chassis:

 

pva chassis (6).JPG


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#6 Isaac S.

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Posted 19 January 2022 - 07:20 PM

Cool drop arm, and I love flat wire. It just looks cool.
Isaac Santonastaso

#7 dc-65x

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Posted 20 January 2022 - 05:06 PM

My good buddy Rodney acquired a complete square wire PvA chassis years ago and built it up into this beauty:

 

Von Ahrnes Flat Wire Car (4).JPG

 

Von Ahrnes Flat Wire Car (5).JPG

 

The body is one of my early attempts at fogging paint job. Rodney did the hand lettering:

 

Von Ahrnes Flat Wire Car (6).JPG

 


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#8 Isaac S.

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Posted 20 January 2022 - 05:29 PM

Wonderful car Rick. Great craftsmanship. And thanks for the great pictures. 


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#9 dc-65x

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Posted 21 January 2022 - 09:26 PM

Thanks Isaac.

 

For my motor I was gifted this "20/40 Circular Milled Can" by Rodney:

 

pva motor (2).JPG

 

I got it cleaned and trued up:

 

pva motor (2a).JPG

 

The gnarly screw holes and motor mounting surface..........

 

pva motor (1).JPG

 

.......was milled nice and flat and the holes tapped for 2-56 machine screws:

 

pva motor (1a).JPG

 

Magnets are next.....


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#10 dc-65x

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Posted 22 January 2022 - 01:24 PM

Here are the super duper B magnets and they are huge:

 

pva motor (5).JPG

 

But not quite huge enough.   :wacko2:  They still need shims on the top and bottom to fit the can snugly:

 

pva motor (17).JPG

 

The axle cutout in the can also needed to be opened up to clear the 1/8" axle with 7/8" tires. I also cut some clearance on one side of the can for a motor bracket brace:

 

pva motor (10).JPG

 

Now, with a .750" diameter spur gear, it's the corner of the magnet that hits the axle and dictates the minimum motor angle to about 12 degrees. That's the same motor angle as PvA's.

 

pva motor (9).JPG

 

With this can and a junk endbell in the setup jig I can start bending wire for the chassis........


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#11 dc-65x

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Posted 31 January 2022 - 09:00 PM

With my Champion jail door car finished up I can carry on with this build. I was going to start the chassis but I'm waiting on a new tool to arrive in a few days. I can't help it, I a tool freak.   :crazy:

 

I broke out a NOS repackaged Mura end bell from Quaid Experience.........very psychedelic!   :laugh2:

 

pva motor (3).JPG

 

The bottom of the end bell was milled to clear the frames half rail. The top has a small slot milled to clear the buss bar:

 

pva motor (15).JPG

 

Holes were also bored top and bottom for comm cooling/inspection:

 

pva motor (14).JPG

 

Buss bars are made up from .039" piano wire:

 

pva motor (6).JPG

 

I'm adding thick aluminum Certus Super Proofer plates under the brush hoods:

 

pva motor (4).JPG

 

Here are the goodies for the spring posts:

 

pva motor (11).JPG

 

The Mura self tapping cap screw on the right is replaced with a 2-56 fillister head machine screw. The screw head is ground down a bit to fit inside the Mura brass brush spring cup instead of on top of it. The shorter setup give more clearance for the frames half rail.

 

I'm also using a fiber washer under the spring to isolate it from current:

 

pva motor (12).JPG

 

A very low profile pan head machine screw is used on the bottom left. This will help with clearance for the forward axle tube brace:

 

pva motor (19).JPG

 

A view of the top and the buss bars:

 

pva motor (18).JPG

 

The end bell should be good to go:

 

pva motor (7).JPG


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#12 dc-65x

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Posted 01 February 2022 - 09:29 PM

I'm really happy with how the end bell turned out so with that done I dug up an armature for the project. 

 

PdL used a "bubble gum" arm for his PvA restoration so I'm doing the same. Mine is from a many years old eBay lot of B-motor parts:

 

pva motor (20).JPG

 

The arm isn't dirty, the dark spots are armature dye that was slopped all over the thing.  :wacko2:   I scrubbed off all I could with lacquer thinner.

 

It's a REHco repackaged Mura 27-28 wind:

 

pva motor (21a).JPG

 

I cut the comm and polished the rest of the arm:

 

pva motor (20a).JPG


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#13 Isaac S.

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Posted 02 February 2022 - 08:59 AM

Cool arm. Will make for a fast motor. 


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#14 Vay Jonynas

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Posted 02 February 2022 - 02:56 PM

 

Here is how the chassis looked in the January 1970 Model Racing Journal race report. Click on the photo to enlarge it:

 

attachicon.gif MRJ V1N21 p8 jan 9 1970.jpg

 

It was rediscovered and 50 years and taken their toll: (photo courtesy of LASCM):

 

attachicon.gif post-22-0-05988200-1540602628.jpg

 

Steve Okeefe worked absolute magic restoring it to its former glory (photo courtesy of LASCM):

 

attachicon.gif PvA King Record Car (7).jpg

 

PdL also worked magic restoring the complete car back to as raced (photo courtesy of LASCM):

 

attachicon.gif PvA King Record Car (9).jpg

 

 

 

Very interesting chassis concept! Do you think it would/could still be a winner on today's tracks/surfaces?

 

:)


Flatheads_Forever_small.jpg?width=1920&h


#15 dc-65x

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Posted 04 February 2022 - 07:56 PM

Modern cars are way faster Vay. But hammering an early open car on a Blue King is an amazing experience.

 

Here is Steve Okeefe's scale drawing of PvA's record setting chassis:

 

PvA King Record Car (8).jpg

 

I started chassis construction with the rear axle tube:

 

pva chassis.JPG

 

I saved the PvA half rails and used them as a template to make my own.

 

pva chassis (1).JPG

 

Mine are on the outside of the PvA half rails:

 

pva chassis (7).JPG

 

Rather than bend up a part and solder it on one at a time I made up all the parts for the center section. All the bends are either 12 degrees or a right angle:

 

pva chassis (8).JPG

 

The center section is all in one lump:

 

pva chassis (9).JPG

 

The motor bracket and brace are next.......


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#16 Pablo

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Posted 04 February 2022 - 08:14 PM

Wheeeeee  :music:  :D


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#17 dc-65x

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Posted 06 February 2022 - 08:46 PM

I filed a notch in the frame rails........

 

pva chassis (10).JPG

 

.........to allow the bottom motor screw to be used:

 

pva chassis (11).JPG

 

The motor bracket acts like large gusset to strengthen the frame where the notch was cut:

 

pva chassis (15).JPG

 

A rear axle tube brace like PvA's attaches to the motor bracket:

 

pva chassis (14).JPG

 

The center section is ready for that PvA fabricated drop arm next:

 

pva chassis (13).JPG


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#18 dc-65x

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Posted 07 February 2022 - 09:42 PM

I'm very lucky to be able to add a little touch of PvA's craftsmanship to my build with his assembled drop arm:

 

pva chassis (2).JPG

 

Of course it can't be proved but his ads say he personally made the things he sold:

 

MRJ V1N19 p8 oct 29 1969.jpg

 

The the double plumber rails:

 

pva chassis (16).JPG

 

Here they are cleaned up:

 

pva chassis (19).JPG

 

The drop arm and other components with the plumber hinge tubes trimmed and the overall length reduced:

 

pva chassis (17).JPG

 

 

 

 


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#19 dc-65x

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Posted 11 February 2022 - 09:12 PM

Soldering the pans on worked so cleanly I thought I'd share what I did. The pans are securely soldered on without the wide soldering iron track usually seen on the pan next to the hinge wire.

 

Just use the tip of the iron to secure the extra long hinge wire on the side where the body mount pin tube will go:

 

pva chassis (21).JPG

 

Now solder the extra long pin tube to the end of the hinge wire to hold it in place:

 

pva chassis (22).JPG

 

A "blob" of solder on the iron tip is placed on top of the pin tube and hinge wire. As the solder flows down to the pan, run the iron's tip along and off the pan dragging any excess solder with it:

 

pva chassis (23).JPG

 

After washing the pan on the top off you can see how little cleanup is necessary for it to look like the one on the bottom

 

pva chassis (24).JPG

 

Both pans and plumbers are ready to install on the chassis:

 

pva chassis (25).JPG

 


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#20 Isaac S.

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Posted 11 February 2022 - 09:36 PM

Looks great!


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#21 dc-65x

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Posted 14 February 2022 - 12:40 PM

The plumber halves are tied together. I used Kapton tape again to make sure the didn't get accidently soldered to the frame:

 

pva chassis (27).JPG

 

The pan assembly got a good wash with Dawn, high pressure air blow dry, a good polishing and finally a WD-40 soak:

 

pva chassis (30).JPG


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#22 dc-65x

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Posted 15 February 2022 - 12:29 PM

Moving right along, the pan down stop gizmos are added.......

 

pva chassis (34).JPG

 

.......and the plumber upward stops on the center section:

 

pva chassis (32).JPG

 

With the square wire I could use my disk sander's miter gauge set to 12 degrees on the chassis parts. Look at the tight fit you can get by just sanding a bit at a time and sneaking up on the parts fitting together:

 

pva chassis (33).JPG

 

The chassis is finished:

 

pva chassis (35).JPG

 

pva chassis (36).JPG

 

pva chassis (31).JPG

 

pva chassis (37).JPG

 

Time to paint the motor can and finish up the motor.


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#23 Dominator

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Posted 15 February 2022 - 12:33 PM

Beautiful work.

A motor is only as fast as the chassis it's in.
 
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#24 Isaac S.

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Posted 15 February 2022 - 01:55 PM

Looks fabulous
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#25 dc-65x

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Posted 16 February 2022 - 05:09 PM

Thanks Dominic and Isaac. It was fun working with the square wire.

 

I finished up the B-motor with a coat of black wrinkle paint. I got some nice fine grain "wrinkles" by using 2 light coats and baking at 200 degrees for an hour:

 

pva motor (23).JPG

 

And I couldn't resist adding one of our repop comm coolers. The first ad I have for the Thorp comm cooler was in May 1970:

 

post-5-0-17309100-1563481375.jpg

 

That's a few months after the early 1970 timeline for this build. But let's just say I had a friend that got a prototype of Thorps gizmo and passed it on to me.  :crazy:

 

pva motor (24).JPG

 

The shunt wires are tucked in out of the way:

 

pva motor (27).JPG

 

That green "bubble gum" arm really stands out:

 

pva motor (26).JPG

 

Here's the masked off and tinned area to solder in the motor:

 

pva motor (25).JPG


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