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Jughead

S30 Frame Construction

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Greeting fellow Zed heads.  Can anyone tell me how S30 frames were attached to the unibody in the factory?  Were they integrated inside of the unibody pieces, or simply welded on after the fact?  I've looked at a ton of pictures and search the forums, and I can't find any info.  Does anyone know?

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What do you mean? I'm not really sure exactly what you're asking, but I think you kind of answered your own question there - the S30 is a unibody. No frame.

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There are several sub frame pieces that are spot welded under the bottom pan of the car, mostly toward the back but they would not have been added after, they were integrated as the unibody was constructed.  Hope that helps.

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Further to Grannyknot's comment, I suppose you could be tricked by certain diagrams into thinking there's a separate frame...

image.png

... but there really isn't.  It's just a collection of panels, ribs and rails, all spot-welded together. 

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Thanks guys and thanks for the great diagram.  This picture is worth a million words. 

i guess i'm shocked that the engine bay frame rails are not more integrated since they carry all that weight. How can that be?  Am I alone in pondering this?!

I'm obviously spending way too much time under my 240!

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4 hours ago, Jughead said:

Thanks guys and thanks for the great diagram.  This picture is worth a million words. 

i guess i'm shocked that the engine bay frame rails are not more integrated since they carry all that weight. How can that be?  Am I alone in pondering this?!

I'm obviously spending way too much time under my 240!

Well those rails don't carry the weight of the engine as much as they transfer it to the shock towers that are directly inline, the engines weight is taken by the springs and tires for the most part. With a triangulated shock tower brace on the top you have a very ridgid box.

Can someone spend too much time under a Z? 🔧=:)

Edited by grannyknot
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Factory replacement rails were sold as a one piece item, starting at the radiator support and ending behind the seat mounts.

I have one side which was used to develop our 240 rails.

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On 5/18/2018 at 7:25 AM, Namerow said:

Further to Grannyknot's comment, I suppose you could be tricked by certain diagrams into thinking there's a separate frame...

image.png

... but there really isn't.  It's just a collection of panels, ribs and rails, all spot-welded together. 

Here`s a more complete illustration of the set of panels that make up a typical unibody structure (not a 240Z, but remarkably close)...

image.png

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We make and sell the following parts:

  • 240/early 260 frame rails - these start 9 inches in front of the firewall and end were the OEM version does. It covers about 2/3 of the TC rod box and are made from 13 gauge steel. Sold as single or as a set. Can be used as a complete replacement or a slip over to existing rails.
  • 240 optional rear rails -  a personal design piece that was never offered. It connects the under seat rails with the rear of the car. Sold only as a set. A stock rear sway bar will not fit but a Suspension Tech will
  • 280/late 260 rails - made to match the contours of the 280 floor pan. Sold as a pair or a single rail. Same thickness as the 240 rails. These will not fit aftermarket 280 floor pans which are flat. Our 240 rails can be used.
  • Sway bar plates - used to keep the engine bay rails and fenders from separating under high stress when a larger than stock sway bar is used.
  • Single point jack plates - used if you want to change both tires on a side using only one jack point.
  • 240/early 260 seat brackets - replacement mounts sold by side

 

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