Haynes Forums  

Go Back   Haynes Forums > Haynes Roadster Forums > Chassis
FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Display Modes
  #1  
Old 22nd October 2012, 05:54 PM
voucht's Avatar
voucht voucht is offline
Senior Member
 
Join Date: Jun 2011
Location: Lautrec, Tarn (81), Occitanie, France
Posts: 879
Default Roll Bar too

I could manage to get my roll bar locally made, but I made a little mistake in the measurements of the main hoop: I told them 416mm high from the lower face (to be welded on RB1) to the top, instead of from the lower face to the middle line as in the book. Which means that the main hoop is about 25mm too short. I'm not tall (1.73m, sorry don't know how it is in feet ), so I think it is not a big problem. But do you guys see any problem with a "too small" roll bar ?
Thank you.
Reply With Quote
  #2  
Old 22nd October 2012, 06:30 PM
K4KEV's Avatar
K4KEV K4KEV is offline
Senior Member
 
Join Date: Feb 2010
Location: WINGATE CO DURHAM
Posts: 1,511
Default

I dont think 1 inch is gonna make too much of a difference Sylvain .....just dont grow any more and get a skinhead
Reply With Quote
  #3  
Old 22nd October 2012, 07:36 PM
voucht's Avatar
voucht voucht is offline
Senior Member
 
Join Date: Jun 2011
Location: Lautrec, Tarn (81), Occitanie, France
Posts: 879
Default

I think you're right Kev'

Quote:
Originally Posted by K4KEV View Post
just dont grow any more
I lost all hopes of being taller years ago

Quote:
Originally Posted by K4KEV View Post
and get a skinhead
At my age, hair fall off without any external help

Thanks mate ! Pictures of the roll bar soon online.
Reply With Quote
  #4  
Old 22nd October 2012, 08:21 PM
twinturbo's Avatar
twinturbo twinturbo is offline
Super Moderator
 
Join Date: Jul 2008
Location: Carlisle
Posts: 4,389
Default

Raise the mounts 25mm if your worried.

TT
__________________
You only get a woosh with a dump valve

Build Thread


Man Cave Mantiques



Cecil Street Auto Repairs Garage Carlisle




Build Cost £4181.65 - Last - Wheel Cylinders
Reply With Quote
  #5  
Old 22nd October 2012, 08:41 PM
baz-r baz-r is offline
Senior Member
 
Join Date: Nov 2009
Posts: 1,464
Default

why not just weld in two same size bits of tube to jack it up 25mm?
Reply With Quote
  #6  
Old 22nd October 2012, 09:01 PM
voucht's Avatar
voucht voucht is offline
Senior Member
 
Join Date: Jun 2011
Location: Lautrec, Tarn (81), Occitanie, France
Posts: 879
Default

Quote:
Originally Posted by twinturbo View Post
Raise the mounts 25mm if your worried.

TT
You are right, I'm not going to do it now, but I will keep this as an option for later if I need.
Thank you.

Quote:
Originally Posted by baz-r View Post
why not just weld in two same size bits of tube to jack it up 25mm?
Problem is that I don't have this size of tube, as I ordered the roll bar from an engineering company.
Thanks anyway, could have been a solution
Reply With Quote
  #7  
Old 22nd October 2012, 09:14 PM
ayjay ayjay is offline
Senior Member
 
Join Date: Dec 2010
Location: Coedpoeth near Wrexham, North Wales
Posts: 737
Default

Lower the seat.
Reply With Quote
  #8  
Old 22nd October 2012, 11:41 PM
alga's Avatar
alga alga is offline
Senior Member
 
Join Date: Feb 2009
Location: Vilnius, Lithuania
Posts: 1,249
Default

In fact I made the rollbar hoop 51 cm high in order for a plank put between the engine and the rollbar to clear my head by several centimetres.
__________________
Albert
Haynes Roadster FAQ | Haynes Builder Locations
Gallery, build thread in Lithuanian / via Google Translate.
Reply With Quote
  #9  
Old 23rd October 2012, 03:25 PM
voucht's Avatar
voucht voucht is offline
Senior Member
 
Join Date: Jun 2011
Location: Lautrec, Tarn (81), Occitanie, France
Posts: 879
Default

As Kev says, I'm not sure 25mm will make a big difference (especially for midgets like me). I guess you made it 51cm high because you are tall. But I don't really trust the roll bar design an anyway and hope the car will never flip over. I think the best chance of survival in the Roadster is not the roll-bar, but staying on the 4 wheels
Reply With Quote
  #10  
Old 25th October 2012, 07:49 PM
voucht's Avatar
voucht voucht is offline
Senior Member
 
Join Date: Jun 2011
Location: Lautrec, Tarn (81), Occitanie, France
Posts: 879
Default

Hi,
I'm in a deep sh...t
I just finished my roll bar.

IMG_2751_1.JPG

But I have a problem: after fully weld the cross-bar, it looks like the whole thing shrieked. When I tried to fit the roll bar fully welded, it looks like each RB1 plate moved inward of about 3mm. So I can't bolt the roll bar on the chassis, it is of course not flexible enough to match CP3/CP4 hole pattern.

IMG_2747_1.JPG

However, to put everything together, I made sure that:
- I drilled plates RB1 at the same time as CP3/CP4, to make sure both hole patterns will be exactly the same,
- I tacked the man hoop on RB1 with RB1 bolted to CP3/CP4 on the chassis to be sure they will be exactly where they should be,
- I tacked the cross-bar and the back stays in the same way.
But I should have fully welded the roll bar with the plates bolted to the chassis too. I didn't expect it to move so much after being tacked.

What do you guys think? How can I solve the problem? I really don't want to cut RB1 plates off and weld new ones. I'm thinking about making “oval” holes on RB1 to match with CP4 hole pattern, but as the roll-bar is holding the seat belts, is this acceptable?
Any opinion, advice or comment is welcome. I'm so pissed-off
Thank you.
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT +1. The time now is 08:24 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.