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> Rear tranny/engine mount, I've been cutting again
URY914
post Nov 25 2004, 06:59 PM
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The front and middle sections of my car are already semi-tube framed. Now its time to do the rear section. I pulled the engine and started cutting. I decided to fabricate a rear tranny/engine mount using tubing and tie it to the shock towers and the rear side of the swing arm "ear". I 'm going to do one side at a time so I don't loose the alinement and location of the trany. Here is a shot of it cut away...


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URY914
post Nov 25 2004, 07:00 PM
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another


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URY914
post Nov 25 2004, 07:02 PM
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Oh NO what have I done???


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URY914
post Nov 25 2004, 07:03 PM
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The inner fender piece that is rear of the shock will be cut away also.
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URY914
post Nov 25 2004, 07:06 PM
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The tape in this shot shows how the bars are going to be installed. I'll also connect each side with a cross bar running over the top of the tranny.

I'll be using 1" tubing.


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URY914
post Nov 25 2004, 07:08 PM
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I'm also running bars from the shock tower forward to the main hoop.

Have I lost my friggin' mind? (IMG:style_emoticons/default/sawzall-smiley.gif) (IMG:style_emoticons/default/welder.gif) (IMG:style_emoticons/default/wacko.gif)

Paul
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TimT
post Nov 25 2004, 07:44 PM
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(IMG:style_emoticons/default/ohmy.gif) (IMG:style_emoticons/default/ohmy.gif)

Wowsers, not much left!!! I need to start cutting my car up now also (IMG:style_emoticons/default/sawzall-smiley.gif) (IMG:style_emoticons/default/welder.gif)
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machina
post Nov 26 2004, 07:18 AM
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QUOTE(URY914 @ Nov 25 2004, 08:02 PM)
Oh NO what have I done???

Paul, your either brave or....nevermind.

Really, how do you cut the tubing? Do you use a notch cutter at the ends?

One day I wanna hack my car up too. (IMG:style_emoticons/default/sawzall-smiley.gif)
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URY914
post Nov 26 2004, 07:41 AM
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David,
I use this tubing notcher I bought at Wholesale Tool. You chuck your 1/2 drill motor to the shaft, and install a hole saw on the end of the shaft. Clamp the tubing in the the left and you can adjust the angle of the cut.

Its not for pro quality but it works for a home workshop.


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URY914
post Nov 26 2004, 07:47 AM
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This is my new favorite tool. Porter Cable "Porta-Band". A bandsaw with handles.
Ajustable speeds. Cuts sheetmetal like it was paper.. (IMG:style_emoticons/default/happy11.gif)

Paul

P.S. Don't cut up your car. Your car is way too nice. Mine had rust issues.


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ChrisFoley
post Nov 26 2004, 08:27 AM
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Paul,
I would use something a bit sturdier than 1" tube to carry the tranny.


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Jeroen
post Nov 26 2004, 11:33 AM
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Paul, maybe add some additional braces (see pic below)
Try to get the brace from the tranny mount down to the susp. ear as low on the ear as possible (check clearance of the drive shaft)

This is what I'm aiming for (I'm leaving the stock dogbone in place though)


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URY914
post Nov 26 2004, 05:43 PM
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Chris, I'm using 1 1/4" from the shock towers down to the tranny and 1" running to the ear. Plus a bar on top of the tranny to connect each side.


Jeroen, It's not good pratice to run bars to the center of another bar without having more bars on the other side of it. Which is what you're doing with the bar between the shock towers. I'm going to try to get the bars as low as possible on the ear.

I'll also be running 1" bars over the top of the engine to the main hoop. I rough cut the bars today and I'll post the pics as soon as the camara battery charges.

Paul
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Jeroen
post Nov 26 2004, 06:21 PM
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...................


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URY914
post Nov 26 2004, 06:39 PM
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I see it but I don't like it. (IMG:style_emoticons/default/biggrin.gif)

That bar between the shock towers is stressed right there in the middle.
The whole thing could fold up on the center line of the car.
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Jeroen
post Nov 26 2004, 06:44 PM
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Oh well... it's not the first time we disagreed on cage designs (IMG:style_emoticons/default/lol2.gif)

Keep them pics flowing!
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machina
post Nov 26 2004, 06:45 PM
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interesting how he braced the inner ears though. Went back with them as well as going to the firewall.

Does anyone actually study up on this stuff or do we just wing it? Like going with your gut.

Alot of the time the best engineered and tested systems don't seem to make sense on first sight.
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URY914
post Nov 26 2004, 07:14 PM
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I've been looking at, taking pictures and studying semi-tube framed 914's for years.
Everybody's just a little different. And they all think thier way is the best way.

For my purpose which is autox only, I think my design will be fine. If I was building a 3.6 road race monster, I would need more structure. I'm not entering a corner at 120 mph and holding +1 g's for 10 seconds.

Simple layout, easy to fabricate and lightweight is what I'm going for. The idea behind lightweight tubing space frames is, if you see a problem developing, you can add some more bars or gussets to stiffen it up. I could run 2" bars everywhere but I never know where I was over designed.

Call be Colin Chapman.... (IMG:style_emoticons/default/cool_shades.gif)

Paul
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TimT
post Nov 26 2004, 07:30 PM
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QUOTE
Alot of the time the best engineered and tested systems don't seem to make sense on first sight.


Also many engineering solutions to problems are the simplest!

I have forgotten the word, but there is a word or phrase, that describes, the first most apparent thought being the correct solution... and its not KISS ( keep it simple stupid)

Paul, Jeroens illustration looks like it would work just fine..

Also ever wonder why the floor of you home is made from 2x8 or 2x10 or 2x12wood or glue lams?... and yet the wall is made up of 2x4 ( or 2x6)

Slenderness isnt bad in engineering circles..

You need large section members where bedning is a consideration..

small section works well in tension and compression
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Series9
post Nov 26 2004, 07:39 PM
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QUOTE(URY914 @ Nov 26 2004, 05:39 PM)
I see it but I don't like it. (IMG:style_emoticons/default/biggrin.gif)

That bar between the shock towers is stressed right there in the middle.
The whole thing could fold up on the center line of the car.

(IMG:style_emoticons/default/agree.gif)

I think the four tubes (two forward and two rearward) that meet in the middle of the crossbar are somewhat useless.
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