158 replies to this topic

[Pablo]

I finally decided on the perfect build for this Havlicek 21T/25 monster blue Mura motor -

my friend Capt. Rick paved the way by building a super-fine one a decade ago:

 

http://slotblog.net/...73-nats-winner/

 

Joel used a Champion can but I think my Mura will work fine.

First thing I'm gonna need is a pair of Lancer Porsche 917's.

A good re-pop would be OK for me. Any ideas?

[Bill from NH]

Contact Ron Hershman, Outasite has both the Lancer open-cockpit Porsche & the Lancer Porsche coupe bodies.

 

FYI The hole on a Camen droparm is the same size as that on a Parma droparm, but it is further back. IIRC, it's 1/16" back.

[dc-65x]

Hi Pablo,

 

Boy my old thread brings back memories. That is one car I wish I had back. Joel was really looking over my shoulder and guiding me on that build.

[Pablo]

Thanks Rick and Bill

[Samiam]

WOW!  Nice choice for a build subject. I'll be watching and taking notes.

 

                                   

[Pablo]

No need for notes, Sam, just follow the master dc-65x thread

Here is the motor

 

 

 

Found the perfect wheels

 

 

 

[grooverunner]

Need Drop Arm ?

 

PM sent

[Pablo]

I sure do, Ken   PM returned.

[Pablo]

Wow, today was my lucky day - went from scratching my head wondering which way to go, to having a firm plan and parts

-Porsche 917 bodies on order from Outisight

-Aguirre-style custom dc-65x front wheels with O-rings installed for an OD of .650

-Telescoping style custom dc-65x rear wheels and natural rubber donuts glued and ready

-found a (good, used) 41T 64P bronze spur and a (new) 8T Sonic straight steel pinion

-second (more conservative) gearing choice - 7/38 Sonic gears on order

-grooverunner has my drop arm needs covered

[Pablo]

I noticed Capt. Rick's track test results were typical big HP motor with no glue - violent wheelspin.

His was geared 8/42 with 13/16 OD wheels, and orange donuts.

 

I remember some sage advice from World Champion Greg Gilbert when I had the same situation with a super wild Mura in my Batmobile. It would simply spin the wheels at first touch of the trigger. He suggested dropping a tooth on the pinion.

I questioned it by saying "the acceleration needs to be tamed and you want me to gear it for more acceleration?"

He just winked and said "Try it". I did and it worked

 

That's why I may use the 7/38. I'm also going to use a grippier tire compound - natural rubber - in hopes of hooking it up.

We shall see,,,,

[dc-65x]

Hi Pablo, 

 

I gave up with the fresh orange vintage tires and open motor cars on a light spray glue track. Now I use the orange tires for show and whatever modern rubber the track likes for go.

 

 

-Aguirre-style custom dc-65x front wheels with O-rings installed for an OD of .650

 

In the Oakland Speedway treasure-trove PRO slot car stash, the Aguirre front O-rings were often found with small flats having been ground down to .625". Just a tidbit for your information.

[Bill from NH]

Orange rubber "in the day" was typically used with full glue & also when glue zones were used.  Today, most tracks use spray glue, that's why different rubber & different gearing works. 'In the day" 7T 64 pitch pinions did not exist.

 

I use to cut o-ring fronts to a true 5/8" with my lathe. 

[Pablo]

-Aguirre front O-rings trimmed and trued to .628

-Jet Flag blueprinted, faced, shaft trimmed and threaded for a nut like Joel's, and dyed blue

-donuts mounted on the Limpach replica hubs

 

[Mike Patterson]

I think the guide should be purple, whether it's historically accurate or not.

[dc-65x]

I bet Joel would think everything should be purple!  

[Bill from NH]

When Camen use to issue paper catalog sheets, they were printed in a bold purple ink on a lighter colored purple paper. A friend who has stayed overnight at Joel's VA home told me his beds have purple sheets & pillow cases & he wore purple pajamas. 

[Pablo]

I didn't know it had to be purple. Sorry for posting it.

[Pablo]

Piano wire "Tinning Party" was long overdue here at The Wolcott Ranch.
A tip for those of you who want your wires to lay absolutely flat on a block:
Check individual pieces for straightness with a dial indicator.

 

Some bent pieces can be cut (bad spots removed) and saved as short pieces for things like uprights, braces, etc. Save the best long straight lengths as main rails.

Lately, .055 wire from K & S has been the worst. I've thrown away entire batches of it.
Both the supplier and the manufacturer deny there is a problem.
Occasionally I'll find a piece of .063 that doesn't pass muster, but lately it's all the .055 that's bad.

 

Now I have clean, straight, tinned wires of all sizes ready to rock

 

 

[Pablo]

"Drop arm" from grooverunner arrived today - looks great

It's accurate, dead flat, and tongue rise is .063.

As my dad used to say, "Just what the doctor ordered"

 

[Pablo]

Body hasn't arrived yet, so I did some prep on the "drop arm".

Used a 3/16" OD chainsaw file to slightly open and smooth flag shaft hole.

Both rotating surfaces on tongue faced and all edges including the cutout area sanded.

 

This is a quality product and it didn't take much work. Flag stops in exactly the same places as an original.

Tongue angle checked with Tongue Tweeker - spot on level, both fore/aft and left/right

 

My "shakey-shakey" (dc-65x called his a "clicker" ) is .032 thick

 

[Pablo]

My "shakey-shakey" is done. I took advantage of the fact this car isn't intended to be an exact replica by making slight changes to the design as I see fit. As a mechanic, I simply cannot resist attempting to make things better. I doubt Joel would disagree with that The design and placement of the wires on the original car is, however, a beautiful thing

Wires are .039. It droops a little, lifts a little, and horizontal movements are about 15 thou all 'round.
I don't consider the numbers to be an exact science at all

 

My upstop wires don't bend and meet the rails or the axle tube because I consider it overkill - the shakey isn't a stressed member and doesn't perform a critical function. What it does, in my opinion, is provide a perfect place for a piece of lead if the tuner desires

 

[Pablo]

Beautiful Porsche 917 in 10 thou Lexan® from Outisight has landed at The Ranch

 

[grooverunner]

[Pablo]

Waiting for one more key part to arrive in the mail, possibly tomorrow....

[Pablo]

A (rough) mock up of the wheels, drop arm, flag, and body says:

WB 3 7/8

GL 7/8

Chassis pan width 3.150

 

 

Using dc-65x's build thread as a guide, I think I'm on track.

 

Or if I'm not, hopefully someone who has never built one will surface and tell me how I should have done it.

 

If the spur arrives tomorrow, I'll soon be busy as a beaver