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Toyman!
Toyman! GRM+ Memberand MegaDork
1/17/24 12:12 p.m.

In reply to accordionfolder :

They let me build a bus and a boat. I'm pretty sure this is allowed. 

 

Very cool build. I'm pretty excited to see how it does. 

 

lotusseven7 (Forum Supporter)
lotusseven7 (Forum Supporter) Dork
1/22/24 4:35 p.m.

Not much time to work on the chassis lately as our puppy had some surgery. I did get a few hours the other day and today to get more cutting, bending, notching and welding done. I'm mainly concentrating on the front half and suspension mounting areas. I won't be working on the back side until I get the donor bike stripped down and have the engine out. Figuring where the rear diff housing and engine go will be the next big part of the project. Once they're in place, I can get the frame tubing finished up and work on seat & pedal placement. 
 

accordionfolder
accordionfolder UltraDork
1/22/24 6:04 p.m.

Not much time to work on the chassis lately as our puppy had some surgery.

 

I hope everything went well - the kart looks great but out little furry friends are more important.  

lotusseven7 (Forum Supporter)
lotusseven7 (Forum Supporter) Dork
1/22/24 7:18 p.m.

ANSOLUTELY! He's been our obsession for the last 9 months. He turned one on Thursday and had his neutering surgery on Friday. Happy Birthday Bodhi!

 

We have no kids, so let's just say that he's more than a little spoiled  

 

 

 

lotusseven7 (Forum Supporter)
lotusseven7 (Forum Supporter) Dork
1/23/24 9:16 p.m.

I feel like a lazy bum after reading thru some of the other builds on the forum, but it is what it is. I only get so much time to work on these projects and do my best to get done what I can when I can. Today was a good day working on 2 projects. First, I was able to get all of the tubing on the crosskart that I wanted and off the jig. Once I had it on the floor, I was able to lay it on both sides and flip it upside down to complete all of the welds. I'm going to move the jig off the table, set the chassis back on and determine the chassis ride height.

 

I also took the chain-drive rear-end and disassembled it to see just what it is. I had no idea if it was a spool, open, lsd or ? Much to my surprise and amazement, it turns out to be a TORSEN differential! SCORE!!!! Now I need to figure out what kind of Torsen, what the stub axles are from and hopefully what kind of HP they will take. Looks like this will eventually have much better on-road manners than a spool set-up.

 

 

 

 

Oapfu
Oapfu GRM+ Memberand Reader
1/23/24 10:18 p.m.

Audi center diff?  No idea about which one specifically.

lotusseven7 (Forum Supporter)
lotusseven7 (Forum Supporter) Dork
1/25/24 9:00 a.m.

So curiosity got the best of me when I was looking at the chassis once it was on the ground. It looked very small and got me wondering if my 58 year old @$$ was even going to fit in this thing. I stole the seat and pedal assembly out of the Corvette Kart and set them inside the chassis. I then made my way inside, took a seat and much to my surprise it's going to work! Rather than mount in the seat right now, I think tht the best way to move forward is literally to build forward. Mounting the chain drive unit first, then fitting the engine in a spot which will give me adequate room to both work on and remove the assemblies. Once this is done, I can mount the seat and get whatever angle feels right. Last will be the pedals, which I will make adjustable for taller/shorter drivers. 
 

It's going to be a few weeks before any other updates as I need to design and build jigs for the front a-arms and then the a-arms themselves. It's time to order some rod-ends and mounting tabs.

 

Mr_Asa
Mr_Asa UltimaDork
1/25/24 9:35 a.m.

I know that, for a while, Torsen actually supplied a University specific diff.  Might be worth looking up to see if it matches.

If not that, I'd see if you can find the FSAE team that did the build, they usually keep track of what parts they use, and use them for several years in a row.

lotusseven7 (Forum Supporter)
lotusseven7 (Forum Supporter) Dork
1/26/24 8:57 a.m.

I do believe that it is a University Torsen and I have an email into Taylor Race Engineering to identify it an the accompanying pieces. I just want to make sure that the splines and input stubs can handle the kind of power that the donor motor will make.

golfduke
golfduke Dork
1/26/24 9:40 a.m.

One of my favorite old youtube videos is of a bunch of crosscarts just giving it the beans on a British circuit in the pouring rain... Looked like an absolute riot to hoon... 

 

Following with interest, very nice fab work thus far!!

 

fusion66
fusion66 Reader
1/26/24 12:22 p.m.

In reply to lotusseven7 (Forum Supporter) :

This might have the answers you seek. The link has technical data.

Torsen® Traction

 

 

 

lotusseven7 (Forum Supporter)
lotusseven7 (Forum Supporter) Dork
2/24/24 9:26 p.m.

Not much time to work on the kart the last few weeks with customer work taking priority in the shop, but I did manage to get a bit more done on it. 
 

I had originally planned to build it as a standard crosskart: 10" wheels/tires, spool rear-end, 600/750cc motor and long-travel suspension. I've since changed the direction of my build as more of a formula car with a very sturdy and safe rollcage. I did make the front suspension using Yamaha YFZ450R a-arms, uprights, hubs, rotors and calipers. After looking at them, it seems like they would work fine for dirt applications, but since I want to run auto-x, trackdays and hillclimbs, the brakes seem like the limiting factor. I decided to go to version 2.0 and use the Formula SAE items that I have. 
 

It's moving along as time allows.........

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