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Updating the Razzo (tuning fork version)


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#1 JimF

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Posted 01 October 2017 - 11:16 AM

I put the wrap (almost) on this update quite a while ago now but just haven't been able to post it let alone get it on track yet. I wanted to get this done b/c the fork version that I showed previously was built up from scratch where this is done from the R-Geo kit as intended. I'm posting this separately from the original thread b/c I'll also use this frame as a continuation of the JK premium tire testing.

 

So here's the original built from the kit in the foreground, next to this newest version in back. Aside from the difference in motor box vs. tuning fork, there are some other differences as well...........

 

  • This new one is 1/8" shorter wheelbase so it's now 3 7/8"
  • To do this, the pans had to be shortened and the pan hanger had to be positioned carefully.
  • The new one is lighter largely due to the pan "windows" being punched out.
  • The new one also uses "Razzo" rails of .055" instead of the original .062"
  • The new one also has much less pan movement than the two prior ones.

DSC02976.JPG

 

Just an overall view of the new one. (obviously shot before cleanup....... :blush: )

 

DSC02973.JPG

 

Rear detail: Not a ton going on here except for the tie bar across the rails right at the bracket face This was to tighten up the flex of the rails right at the bracket face which is a common trait of tuning fork frames.

 

DSC02974.JPG

 

Nose detail: Main things to note here are the shorter pans in front, and a slightly different stop arrangement. In this case, the inboard pan stops are .055 inside of std 3/32" box tube. I wanted to tighten up the pans and this did the trick. I'll probably add the inboard axle brace (actually just forgot it here) but this is good enough to get it on track to wring it out.

 

DSC02975.JPG

 

This frame will get tested in the next weeks on NorCal's fastest track, the Hillclimb at Motown raceway in Modesto. I already have a couple of cars that work really well there so I can afford to spend some time with this one. The goal here was to take the original and the home brewed forker and make them a little quicker. Things that I suspect that I'll do with this one..........

 

  • This car will come in @ 90gr w/out body so give or take ~~ 96gr. with.
  • ~~ 100 is about as light as I can usually get away with on any of our tracks.
  • I suspect that some small weight additions aft of the centerline will happen.
  • By removing the pan windows, I can selectively add weight where I think it will do the most good.

Testing follows..........I hope........... :wacko2:

 


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Jim Fowler




#2 miko

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Posted 01 October 2017 - 11:18 AM

Very clean work!


Marinko Mueller

#3 JoB

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Posted 12 October 2017 - 10:00 AM

Hi Jim!

All your builds are very nice and a good source of how tos, tips and tricks!

But from this post:
Building the R-Geo Shark F1 (update: newest version tested)

Noo pictures anymore! Please try to get them back, because I normally browse thru your posts to get inspiration for my own builds.

Best Regards,
BrassChass AKA Jens Backman

#4 JimF

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Posted 23 October 2017 - 11:36 PM

Jens:

 

Sorry to miss this until now. Many of my older articles have gotten lost of their pics when Photobucket made their move to hold older pics hostage to a very high ransom price. I apologize for this but will try to get you a few "arrow" pics. I am very strapped for time at the moment but I will work on that when I can.


Jim Fowler

#5 Tom Eatherly

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Posted 01 November 2017 - 02:46 PM

Jim,

Not to hi-jack here, but, That chassis that Jerry Johnson ran to win the Boola Can-Am with, is that something new?


Tom Eatherly

#6 JimF

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Posted 02 November 2017 - 12:08 PM

Jim,

Not to hi-jack here, but, That chassis that Jerry Johnson ran to win the Boola Can-Am with, is that something new?

 

Actually, not all that new. I built the first one for TJ during the summer. Subsequently he loaned it to Jerry at the Western. Jerry won two semis and missed beating Duran by about a lap in the "A". Jerry wanted one for himself so I built the one he just raced plus one for myself. Jerry and TJ have almost identical ones while the one I built for myself is longer and a little heavier for better utility on our flatter tracks. Those were just about the only building that I've done in the last 6 months. The car really works but Jerry is obviously a really talented driver and that plays in as well.

 

I just got beat by mine a couple weeks back when I loaned it to a local hotshot at our last race in Modesto (should'a known better). I was intending to race it myself but then got a late request for a loaner. I just yanked it out of tech and gave it to him and then cobbled together something to race myself. The car I ran was just fine but I for sure gave him the better one.


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Jim Fowler

#7 Tim Neja

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Posted 02 November 2017 - 02:10 PM

Oh yeah---that's the problem when you build for others!! Ya get BEAT by your OWN STUFF!!!  :)  :)   


She's real fine, my 409!!!

#8 boxerdog

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Posted 03 November 2017 - 06:44 PM

We got thoroughly Razzoed that day. 


David Cummerow





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