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seamless?

AzraeL - 17/12/05 at 01:47 PM

Another question from holland...

I know your're gonna call me a cheapass and that's ok.. But is it really neccessary to use seamless steel pipes for the wishbones???
I was thinking of using "regular" pipes but of a slightly bigger diameter...
Would that be a problem??

The car is a modified locost by the book, but with IRS...
And I'm going to place a 300HP 400Nm C20LET Vaux in it.. (I know it's ridiculous but "It has to be!"

Wouter

gazza285 - 17/12/05 at 01:51 PM

I've made replacement ones for a Westfield out of some thick walled tube, that was about five years ago, no problems reported since.

ludsonline - 17/12/05 at 03:44 PM

http://212.53.73.128/cgi/forums/YaBB.cgi?board=Technical&action=display&num=1132245026

kb58 - 17/12/05 at 05:01 PM

quote:
Originally posted by AzraeL
is it really neccessary to use seamless steel pipes for the wishbones??? Wouter

No, as long as the tubing is sized for the expected load. Remember that larger thin wall tubing is stiffer then smaller thick wall tubing.

JoelP - 17/12/05 at 06:36 PM

people often seem to use 25mm x 2mm wall erw tubing, would the consensus be that this is adequate provided the shock mounting is well thought out?

Mr G - 17/12/05 at 07:21 PM

cheapass

kb58 - 17/12/05 at 07:25 PM

quote:
Originally posted by Mr G
cheapass

Locost

Mr G - 17/12/05 at 09:58 PM

quote:
Originally posted by kb58

quote:
Originally posted by Mr G
cheapass

Locost

Where!?

andyharding - 17/12/05 at 10:05 PM

MK Wishbones are made of ERW.

I would be happy using 25mm round 1.5mm wall.

AzraeL - 18/12/05 at 08:13 AM

LOL

Thanks for the advice guys!!
I'm a lot more comfortable now with using 22mm 2mm wallthicknes!

Wouter

Triton - 18/12/05 at 11:06 AM

All those using flat oval tube are using ERW

Mark Allanson - 18/12/05 at 11:23 AM

I have only seen true oval tube on one car, the rest were just partially crushed round

Triton - 18/12/05 at 11:27 AM

It's called flat oval Mark. Aero tube is the groovy stuff but damn expensive

Mark Allanson - 18/12/05 at 11:31 AM

Yes, it comes complete with granular areas in the crushed sections

kb58 - 18/12/05 at 05:18 PM

The real issue is most of us have no idea what loads get fed into these tubes. Sure we can work it out for a given cornering force, that's not hard. The real issue concerns hitting a pothole... just what load does that feed in? How big is the pothole, how deep, how wide? How much air is in the tires, are the tubes already curved, all of this changes the answer.

Since all we can do is guess, guess on the high side. That is, if you calculate during 1G cornering, a given suspension tube will have 300lbs compression load, round WAY up for design purposes, like 1500lbs.

I used a "Strength of Materials" book to find column strength of the tubing I was using. I would have used 25mm OD, 1.5mm wall thickness all around until I found it was too weak for the rear, so those tubes are 32mm OD.

[Edited on 12/18/05 by kb58]

AzraeL - 21/12/05 at 07:31 AM

I've been busy again....

We've bought a ford gearbox today..

The bell-housings.. We'll have to modify one to fit both engine and gearbox..

Milling the adaptorplate on my cnc-mill...

Can someone identify that gearbox for
me?? What type is it? MT75?
On the outside it's exactly the same size as a T9... Would it be possible to fit the internals of a T9??

Wouter

[Edited on 21/12/05 by AzraeL]

Schrodinger - 21/12/05 at 01:18 PM

Wouter
It looks like a T9 to me.
If reverse is push down on the lever and left/forward then it's a T9 otherwise the MT75 has reverse to the right and back.
It doesn't look much like this?
https://www.burtonpower.com/Default.aspx
Tech Support & MT75

Looking at the speedo drive it comes from acar with an electronic speedo.

Hope that helps

Keith
Suffolk

[Edited on 21/12/05 by Schrodinger]

[Edited on 21/12/05 by Schrodinger]

[Edited on 21/12/05 by Schrodinger]

AzraeL - 21/12/05 at 02:53 PM

well then it´s probably a T9..
I´ll check tomorrow!
Thanx for the info!

Wouter