djtom
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| posted on 15/7/09 at 10:41 PM |
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I finally decided what to do about the rear end and bought a GTS De Dion axle from HOL (cheers for that Andy!).
Of course, like everything else about this project, it didn't fit, so it required modification. This was because the linking arm of the De Dion
fouled the petrol tank. I briefly considered getting the tank modified, but as I didn't know anyone stupid enough to volunteer to weld a used
petrol tank I resorted to hacking the de dion apart instead.
Before wading in with the grinder I thought I'd see what geometry was built into the axle as standard, by bolting some 2m tubes to the hub
carriers and measuring the width at the front and at the back. Trigonometry does the rest!
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Turns out that the GTS dedion (well, this one anyway!) has approx 0.6 deg toe in (total) and 0.6 deg negative camber (total).
I thought this was probably a good starting point, so I built a jig to hold the axle in place whilst I chopped out the offending middle section and
replaced it with a less sticky outy bit made out of some scaffolding pole, which should be fairly bullet-proof judging from the impressive weight!
The jig was made of a spare U-beam picked up for a quid from the local scrappy, with hub carriers welded on.
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axle bolted on jig
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chop chop!
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Chopped off an inch or two inboard of training arm mounts.
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replacement scaff pole being measured up
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Scaff bar tacked in place and slotted for a bracing section to be added for strength
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Back on the jig and welded - the bracing section is 6mm sheet, extending right through the axle and welded on both sides.
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Axle trial fitted. Need to shave a bit off the rear diff mount, but it's not doing anything anyway. At least the axle misses the tank now!
Tom
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djtom
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| posted on 15/7/09 at 11:07 PM |
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I wanted to do something about the mounting point for the rear trailing arms. As Tiger originally designed the car, the trailing arms are very short
(245mm c-c) which promotes an unhealthy amount of roll steer. By moving the mounting point forward I can lengthen the trailing arms by about 100mm,
which should help. I need to make some more trailing arms anyway, because a) I want to rose-joint these, and b) I've sold the old ones.
Old mounting point:
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Chopped out:
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New upright made out of 40mm box section, with one side cut out. This has 3mm wall, so should easily stand up to the job. I was only going to cut the
rear away where the trailing arms protrude, but didn't want it to trap water and rust from the inside out, so cutting the whole back of the tube
away should give the water nowhere to get trapped.
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New trailing arms also made now, just need to buy some polybushes for the rear end of them. Anyone know where they are cheapest? I need 4, id of the
trailing arm tube is 28mm, od is 33mm and width is 33mm.
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I feel quite pleased now - feel like I've achieved quite a bit over the last week or so!
Tom
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MikeRJ
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| posted on 15/7/09 at 11:17 PM |
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Probably a good move chopping that section of the De-Dion out as well, I always thought the loading on the central welded joint would be quite high,
and someone did have this joint fail in use!
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HOL
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| posted on 16/7/09 at 01:38 PM |
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quote:
Originally posted by djtom
I finally decided what to do about the rear end and bought a GTS De Dion axle from HOL (cheers for that Andy!).
Only cos I found and bought two!
Ill be bring the second one along for modification once you get all the bugs ironed out!! 
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djtom
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| posted on 16/7/09 at 01:49 PM |
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Only cos I found and bought two!
Ill be bring the second one along for modification once you get all the bugs ironed out!!
I'll keep the jig handy then - although it may be a while before the bugs get ironed out!
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mark chandler
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| posted on 16/7/09 at 10:34 PM |
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Polybushes can be turned down in a lathe, cheapest will be landrover panard rod or trailing arm I recon.
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contaminated
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| posted on 6/10/09 at 09:53 PM |
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Any more progress?
Dan
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HOL
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| posted on 2/12/09 at 08:08 PM |
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Come on Tom, I know you are further in, lets have an update.
Andy
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dave
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| posted on 29/12/11 at 11:24 AM |
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I thought I was mad rebuilding my E1 but this is a full redesign  I am still thinking of replacing the sierra beam set up with something a bit
lighter.
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loggyboy
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| posted on 29/12/11 at 12:02 PM |
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Its also a 2 year old thread?!
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djtom
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| posted on 29/12/11 at 12:10 PM |
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It is indeed a 2 year old thread - keeping it up to date rather fell by the wayside! However, I'm pleased to report that as of early this summer
the car was back on the road, and barring a few teething problems all went well.
First trackday of the year was at Lydden a couple of months ago and it went very well indeed, the changes to the geometry all seem to have worked out
nicely. It now looks like this:
 
Lydden
Regards,
Tom
[Edited on 29/12/11 by djtom]
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JimM
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| posted on 29/12/11 at 04:41 PM |
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Nice work .... Good bit of re-engineering
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