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Rotorranch's IRRAź JKX25R Can-Am race car


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#1 Pablo

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Posted 11 August 2019 - 04:43 PM

As the paint dries on my Lola, I move on to my next project, a race car for Jeff Chambers. He supplied (almost all) the proper "cool guy" parts and a RTR McKee body. He sent two crowns - a Koford, and an H & R baby blue (are these good enough for retro racing?)

 

Bartos front axle, Bartos front BB wheels, Swiss cut down RF flag, RTR hollow set screws, JK 8713PPW rears, Koford rear axles flatted by Swiss, TQ wires, ARP 9T pinion, and my tongue plan is to slice off the stock coined area up front, add a (.032) brass raised deck and lay a 2 degree Swiss tongue atop :sun_bespectacled: 

 

IMG_3172.JPG

 


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#2 Rotorranch

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Posted 11 August 2019 - 04:49 PM

Look like a bunch of BS to me! 

 

I hope it has straight wire!    :sarcastic_hand:  :dance3:  :laugh2: 

 

 

Rotor


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#3 Pablo

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Posted 11 August 2019 - 06:35 PM

Stand by for plenty of inside humor on this build, folks, Rotor is an excitable boy and he loves to joke :D 

 

Calm down, Rotor, no I cannot install shunts on a Hawk Retro motor, and, no, side dams aren't legal in IRRA®  :laugh2:

My helper, Bunky, is in charge of quality control

 

bunky-idea_910.jpg

 

 

 

 


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#4 Bill from NH

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Posted 11 August 2019 - 07:33 PM

 I hope it has straight wire!    

 

 

 

 

Slightly bent wire helps it corner better. :laugh2:  :laugh2:


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Bill Fernald
 

I intend to live forever!  So far, so good.  :laugh2:  :laugh2: 


#5 Pablo

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Posted 12 August 2019 - 06:05 PM

Interesting theory, Bill, have you approached NASA on this yet?  :laugh2:

 

The last JK X25R I built (Tim Hendricks Can Am) used the stock coined tongue and I was happy with it. This one isn't so good. So, first order of business is slice off the coined area and set a platform for a Chi-Town 2 degree tongue. Also, I see all the cool guys are now slicing off the wing tips - I'm following and liking it  :)

 

IMG_3186.JPG

 

Same as Tim's chassis, the pan front axle uprights will be removed

 

IMG_3187.JPG  

 

 


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#6 Rotorranch

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Posted 12 August 2019 - 07:00 PM

OMG.... What are you doing to my baby?  :good:  :dance3:  :clapping: 

 

Rotor


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#7 Pablo

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Posted 12 August 2019 - 08:02 PM

Carving it up like a Thanksgiving turkey, Jeff :)  The wing cutoff angle is 50 degrees from the forward apex of the front section and corners have been rounded. Pan uprights were sliced off and .10 of the meat remains.  The measurements aren't critical, but serve as proof you aren't getting a chassis that was slapped together in a fortnight by an uncaring ignorant sloth 

 

IMG_3191.JPG


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#8 Rotorranch

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Posted 12 August 2019 - 08:18 PM

OMG!!!

 

My poor car! half of it is on the floor!


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#9 Pablo

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Posted 12 August 2019 - 08:23 PM

Next questions in my mind are:

 

1. Stock JK 3/4" wide motor bracket, or ? I think I have a 3/4 FSF bracket, I may check it out...….

2. Rails - my last X25R I used single .063 rails. I'm considering hogging out the parts and using something lower, like multiple .055 or .047 or .039's ?  

 

Rotor, eat another Bon Bon and relax, I got this covered  :laugh2:


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#10 Rotorranch

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Posted 12 August 2019 - 08:25 PM

Excitable Boy??? ME???

 

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#11 John Streisguth

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Posted 13 August 2019 - 06:14 AM

a rail of 063 and a rail of 055 seems to work pretty well.


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"Whatever..."

#12 Pablo

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Posted 13 August 2019 - 07:47 AM

Soldered together all the way up, Johnny?


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#13 John Streisguth

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Posted 13 August 2019 - 09:21 AM

Yessir


"Whatever..."

#14 Pablo

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Posted 13 August 2019 - 05:40 PM

Thanks Johnny.

 

If I went with all .032, how many per side? 3? 4?


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#15 John Streisguth

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Posted 13 August 2019 - 07:11 PM

I would say 6.  And maybe some type of anti-decking set-up like Tony P and Dominator use.  I would think it would bend a lot in the bank.  

 

4 x 047 and 5 x 039 are probably other combos worth considering, as I have seen them in use.


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#16 Pablo

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Posted 13 August 2019 - 10:39 PM

RF flag: shaft pre-trimmed, threaded, blueprinted, etc.

I don't know what nut this is Rotor provided, but it's light, the threads are happy, so I faced it

 

IMG_3212.JPG

 

Tongue and raised brass platform tinned with Koford Hi-temp silver solder

 

IMG_3220.JPG

 

Then aligned and mini-gator clipped, with large clips as a handle. 

 

IMG_3222.JPG

 

 

I slathered the sandwich in acid and hit it with the minitorch. Looks burnt to a crisp, Jeff

 

IMG_3225.JPG

 

You should see my fingers, there will be a six week delay due to second degree burns

 

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#17 Pablo

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Posted 13 August 2019 - 10:49 PM

Just kidding, Rotor  :laugh2:  The elevated brass deck with tongue gizmo cleaned up real nice after a 20 minute cool down  :laugh2:  I rounded off the rear corners because those stock JK rail notches are going to get enlarged

 

IMG_3230.JPG

 

The brass-to-brass connection was tinned with 60/40 to prevent the tongue from moving while heating with the Hakko 455

 

IMG_3232.JPG

 

JK front nosepiece meets Mr. Chicagoland steel 2 degree tongue

 

IMG_3237.JPG


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#18 Rotorranch

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Posted 14 August 2019 - 05:26 AM

It's a Red Fox guide nut.

 

Sorry about your finger. But it's only a flesh wound!

 

3f284b4a-8798-4a59-bdce-62f48b679278.jpg

 

Rotor


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#19 Pablo

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Posted 14 August 2019 - 08:39 AM

A little CA can fix that


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#20 Pablo

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Posted 14 August 2019 - 06:39 PM

I've decided on .039 rails. Gotta break some eggs to make an omelette, Bunky, hand me a new bottle of 409's, here we go. Rotor, enjoy the ride  :smoking:

 

th01GSQGBV.jpg


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#21 Pablo

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Posted 14 August 2019 - 07:44 PM

I cut a bunch of .039 lengths and checked for straightness. There are some really bad batches of wire out there. This batch was excellent - I didn't discard a single piece. Ends radiused, sanded with 400 grit and cleaned with iso alc.

 

IMG_3240.JPG

 

Sharpie marks indicate where my cuts will be

 

IMG_3246.JPG  

 

Brass pieces are cut, sharp edges rounded, twin sets of six .039 "sandwiches" soldered, sanded, and cleaned.

I may add more later. They turned out real nice and flat. This was my first time with multiple small wire rails and I'm glad I did it

 

IMG_3248.JPG  


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#22 Pablo

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Posted 15 August 2019 - 08:26 PM

Nosepiece:

-hogged out to allow five .039 rails

-leadwire gizmo shaved off

-midpoint etched for alignment purposes

 

Rails:

-one piece up front removed for fit

 

Rear axle tube:

-1.34 wide, inner cutoff points etched about .360 inboard of the ends

 

JK 3/4" hypoid bracket:

-squared true

-brace installed

 

IMG_3253.JPG


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#23 NSwanberg

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Posted 16 August 2019 - 04:18 AM

Bunky, hand me a new bottle of 409's, here we go. Rotor, enjoy the ride  :smoking:

 

It would be an obscure group of people that know what this refers to.


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#24 Bill from NH

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Posted 16 August 2019 - 04:48 AM

Nelson, he's cooking an omelette. He probably needs Formula 409 degreaser to clean up.  One of the Washington state body painters uses 409 with his Faskolor acrylics. Pablo isn't ready to paint yet. :laugh2:


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#25 NSwanberg

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Posted 16 August 2019 - 08:46 AM

Bill you missed it. Pablo was refering to 409 Dremel discs. eh Pablo?


Remember the Steube bar! (ask Raisin)
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Peace be with all of us and good racing for the rest of us.
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