looking for a "once over" on the chassis

[L79_Acadian]

Hi Roo,
 OK, I added the diagonal like you recommended. I also made a chute mount and changed the steering box mount also. Any criticism would be greatly appreciated.
I'm also going to go with a smaller tire.
  Thanks,
               Roger

[GlennLever]

Cable and wiring chases through the uprights of the tubes?

[225digger]

shouldnt there be another bar under the front cage hoop  ?  that looks like a pretty big gap

[rooman]

shouldnt there be another bar under the front cage hoop  ?  that looks like a pretty big gap

Yep, there should be an upright placed 1" minimum to 6" max from the front cage hoop.

Roo

[George]

The last SFI spec book I bought was only $ 35. The best money I have spent on the car. I will never buy or build/rebuild without a current one in my hand.

[wideopen231]

Agree with George. 35 bucks is cheap if it keeps you from having to have car certified second time because of something you didn't know about.  I bought mine 2 years ago and it is best 35 bucks I spent on chassis. Hopefully I have all things covered sfi wise.

[L79_Acadian]

Glen,thats a good idea,thw cable/wire chases. I think I will put a few in the upright. As far as the bar below the forward cage loop,is that bar required for a 7.50 and slower car?
  Thanks guys,
                   Roger

[GlennLever]

Glen,thats a good idea,thw cable/wire chases. I think I will put a few in the upright. As far as the bar below the forward cage loop,is that bar required for a 7.50 and slower car?
  Thanks guys,
                   Roger

Roo Man's design

[slingshot383]

Frank Parks has been doing that for years, I don't know who did it first........

[GlennLever]

[janjon]

Yep, there should be an upright placed 1" minimum to 6" max from the front cage hoop.

Why the 1" minimum away? Why not directly underneath where the front cage hoop attaches to the shoulder hoop? Is this to create some ability of the structure to deflect a bit under impact loads?

[rooman]

Yep, there should be an upright placed 1" minimum to 6" max from the front cage hoop.

Why the 1" minimum away? Why not directly underneath where the front cage hoop attaches to the shoulder hoop? Is this to create some ability of the structure to deflect a bit under impact loads?

In a word Yes.

Roo

[janjon]

I notice that L79's placement of the joints of diagonals to uprights is somewhat above and below the intersection of the uprights' joints with the longitudinal tubes, rather than forming the apexes of two triangles between two uprights. I could see how this placement could make the joints more easily weldable to the novice welder, which I am certainly one, without the difficulties of getting into "tight crotches", so to speak. With respect to my question and your reply above, could this placement afford deflection/distortion potential in the event of an impact that would be possibly beneficial to whatever soft tissue might be onboard, and would this represent best practice, or acceptable practice?

[slingshot383]

Putting that upright between 1" - 6"  away instead of straight under the the intersection of the bars is to absorb some of the energy in case of an accident instead of transfering all that energy to the driver. There is such a thing as making something too strong as it relates to the transference of energy. 

[wideopen231]

Glen,thats a good idea,thw cable/wire chases. I think I will put a few in the upright. As far as the bar below the forward cage loop,is that bar required for a 7.50 and slower car?
  Thanks guys,
                   Roger

Roo Man's design

Not sure Roo Man takes the credit for the creation, I'm just crediting the person that introduced me to the idea.


 I think it goes back a long ways and not sure who did it first.Now if Rooman wants credit for something that old who am I to argue.

Our first funnycar built in early 80's had them and Im pretty sure Winston Cherry was not first either.