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Snake Bite I


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#1 Pablo

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Posted 29 January 2015 - 04:35 PM

Finished February 2015:

post-91-0-38980400-1424214972.jpg

 

post-91-0-03288000-1424287740.jpg

 

Here's how it all started:

This (unfinished) Retro chassis was built by Greg Wells long ago.
 
Notice the wide motor bracket, front axle uprights, lots of empty space in the middle, and the rail setup - way ahead of its time.
 
IMG_3426.JPG
 
I'm going to shine it up and assemble it into a new IRRA® legal car.


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#2 Dennis David

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Posted 29 January 2015 - 05:20 PM

Greg just needs the rest of us to catch up.

Dennis David
    
 


#3 Bill from NH

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Posted 29 January 2015 - 05:28 PM

We're caught up now, he can finish it.  :laugh2:  :laugh2:  Pablo, I hope this ends up being a killer chassis. Have fun with it. :) The next chassis you get from Greg might be a Model A. :crazy:


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#4 Cheater

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Posted 29 January 2015 - 05:36 PM

Maybe... LOL!


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Never forget that first place goes to the racer with the MOST laps, not the racer with the FASTEST lap


#5 MSwiss

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Posted 29 January 2015 - 07:22 PM

There is some good stuff going on in that design.

Bet it runs good once finished.


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Mike Swiss
 
Inventor of the Low CG guide flag 4/20/18
IRRA® Components Committee Chairman
Five-time USRA National Champion (two G7, one G27, two G7 Senior)
Two-time G7 World Champion (1988, 1990), eight G7 main appearances
Eight-time G7 King track single lap world record holder

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#6 Pablo

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Posted 29 January 2015 - 10:00 PM

Thanks for the votes of confidence, guys.  :)

Lee Gilbert said pans are only a place to mount weights.

Matt Bruce said chassis only fill in the spaces between the tongue, body mounts, and motor bracket.

I say, "Damn the torpedoes, where did I put those doggone spare Hakko tips?" :laugh2:


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#7 Pablo

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Posted 30 January 2015 - 12:21 AM

Motor removed, chassis into the tumbler.

 

IMG_3437.JPG


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#8 Pablo

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Posted 30 January 2015 - 12:34 AM

Now I understand why they call Greg Wells "cheater" - Noose would catch this for sure.   :laugh2:

 

IMG_3440.JPG


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#9 Greg VanPeenen

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Posted 30 January 2015 - 01:13 AM

Unless that is a stock car chassis. 3.125" is correct for a Can-Am chassis.


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#10 Cheater

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Posted 30 January 2015 - 03:54 AM

What's a mere five tenths between friends?

 

Don't you own a file, Pablo? LOL...


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Never forget that first place goes to the racer with the MOST laps, not the racer with the FASTEST lap


#11 Tex

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Posted 30 January 2015 - 07:49 AM

The stock, right-out-o-the-bag JK Retro chassis were a little over also.


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#12 Pablo

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Posted 30 January 2015 - 10:05 AM

That ain't 5 tenths, it's half a thou. :)
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#13 Cheater

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Posted 30 January 2015 - 10:06 AM

Five ten-thousandths and half a thou are the same, Pablo.

The few machinists I know use "tenths" when referring to ten-thousandths.
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Gregory Wells

Never forget that first place goes to the racer with the MOST laps, not the racer with the FASTEST lap


#14 Hermit #1

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Posted 30 January 2015 - 01:37 PM

ALL machinists I know (and I are one, too) use "tenths" to refer to ten-thousandths. If someone gives them a drawing with 1/10 inch dimensions, they automatically convert it into increments of .100" (one hundred thousandths). Only low-life sheet metal people call out dimensions in 1/10tinch... :wacko2:

Pablo, am I seeing the chassis correctly? The nose-piece/batpans are one piece (not hinge articulated) at the front?
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#15 Pablo

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Posted 30 January 2015 - 03:27 PM

I humbly bow to the machinists and acknowledge my measurement errors. :ok:

Just trying to poke fun at Greg Wells any way I can. :D  I put the mike to the pans - post tumble it's a perfect 3.125", so there. :laugh2:

IMG_3442.JPG
 
Seriously, when it came out of the tumbler, I saw design features that absolutely floored me.

Hi, Dave. :wave:  You are correct, this is a "torsion" style chassis - the nosepiece and the pans are one single piece. Theory is, less movement in front, more movement in rear. Front tilt/lift is governed only by the inherent flex in the brass sheet, and rear is governed by wire into square pieces of tube.


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#16 Eddie Fleming

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Posted 30 January 2015 - 05:18 PM

By the time you get through with it I think Greg will have built a FINE chassis.


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#17 slotcarone

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Posted 31 January 2015 - 01:29 AM

:) Pablo, I have built many of the original JK pan chassis similar to this without cutting the pans off and they all handle beautifully.
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#18 Pablo

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Posted 31 January 2015 - 01:55 PM

Thanks, Mike, I've built several torsion chassis based on Mike Swiss' IRRA® tutorial and they always work very well.  
 
No doubt in my mind the Wells workmanship details were absolutely perfect, but I checked them anyway.  "Trust, but verify"   :)

- Tongue tilt: yup
- Flatness: yup
- Slick 7 bushing alignment: yup

IMG_3448.JPG

It passes all the tests, and infuriates me - I just can't find anything wrong with it.  :dash2:  :laugh2:  My main concern is, "Lord, please don't let me screw this thing up". :heat:
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#19 Hermit #1

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Posted 31 January 2015 - 05:00 PM

Front tilt/lift is governed only by the inherent flex in the brass sheet, and rear is governed by wire into square pieces of tube.

 

So no "bite bar" is needed, and the effective position of the non-existent bite bar is about as far to the rear as possible?  Am I thinking correctly?

 


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#20 Gator Bob

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Posted 31 January 2015 - 08:34 PM

My main concern is, "Lord, please don't let me... ".

 
That is a nice design... I didn't know about this talent of Mr. Cheater.
 
I think possible nick-names could be - "Forked Tongue"  or "Snake Bite".
 
It is in very capable hands to see its completion.
 
Go, Pablo!
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#21 Pablo

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Posted 31 January 2015 - 09:29 PM

So no "bite bar" is needed, and the effective position of the non-existent bite bar is about as far to the rear as possible?"

 
Dave, you are correct - no bite bar needed on a torsion style chassis. As far as theory goes, you'd be better off asking Swiss or Wells.

All I know is, they work. Swiss advertised his tutorial chassis as a flat track piece, but they work on King tracks just fine.


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#22 Michael Rigsby

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Posted 01 February 2015 - 12:06 PM

Swiss advertised his tutorial chassis as a flat track piece, but they work on King tracks just fine.

 
And most Hillclimbs as well. My first JK kits were built just like that in 2009 and that's what I ran until I sold them when the track closed. A lot of pan movement is really not needed on most tracks I've found.

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#23 Cheater

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Posted 01 February 2015 - 12:23 PM

FWIW, that unfinished chassis of mine is, as best I can recall, based on an R-Geo Samurai chassis kit.

Perhaps Rick can post to confirm this memory...
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Gregory Wells

Never forget that first place goes to the racer with the MOST laps, not the racer with the FASTEST lap


#24 Cheater

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Posted 01 February 2015 - 02:04 PM

Rick has PM'd me to indicate he believes it is his first Samurai chassis kit that I started with and suggests it was pre-IRRA®, which makes that unfinished chassis even older than I remembered. IRRA was started in Oct 2007...
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Gregory Wells

Never forget that first place goes to the racer with the MOST laps, not the racer with the FASTEST lap


#25 Pablo

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Posted 01 February 2015 - 05:58 PM

Samurai One it is then.
 
One minor glitch - front axle height needs to be re-set, requiring some disassembly up front.
 
IMG_3468.JPG
 
IMG_3471.JPG
 
Two small pieces were removed, and the center section comes completely free of the pans - pretty sweet.
IMG_3472.JPG
 
As long as I'm slathering it with acid and heating things up, might as well shorten the wheelbase and guide lead to 4.00" / .875".
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