Author Topic: DT frame modification  (Read 7819 times)

0 Members and 1 Guest are viewing this topic.

Offline Dirt Track

  • Senior Member
  • ***
  • Join Date: May 2004
  • Posts: 212
  • Location: Hobart,Tasmania
DT frame modification
« on: 24 Jun 2007 at 10:42 »
G'day all
I dug out my second DT frame today so I could take some photos of it and note the modification it has to the lower front of the frame....see photo.
Has anyone ever seen this type of setup...does anyone remember seeing this frame is quite distinctive.
frame no is TF273.
I cannot imagine why anyone would go to such lengths to modify it in such a way and for what reason?

« Last Edit: 24 Jun 2007 at 12:04 by alwyn »

Offline Alan Cun

  • Master Member
  • ****
  • Join Date: Feb 2007
  • Posts: 432
  • Location: Qld Central Burnett District
Re: DT frame modification
« Reply #1 on: 02 Jul 2007 at 10:26 »
Hello Howard    Dont know what to say about your frame except that compared to my frames it is fairly early, my lowest number is 6** an also 12**.   Had an interesting visitor today from an ex dirt racer who fitted and raced a double 500 Triumph engined  outfit (very successful ,got the pics if interested). What he did comment on was why Douglas continued with what he described as push bike frame brazing technology, instead of frame bending, even into the 50s. Very interesting ?  I have in the past seen some very interesting and  undetectible mods.  Bob Barlow has a very interesting RA frame with 2 under tank rails I think it was, a fair distance apart.   regards Al

Offline Doug

  • Administrator
  • ****
  • Join Date: Mar 2004
  • Posts: 4600
  • Location: Glen Mills, PA, USA
Re: DT frame modification
« Reply #2 on: 03 Jul 2007 at 02:23 »

The treatment of the lower extremities of the front down tubes is novel to me, I have not seen that on any other DT Douglas. I do not think it is a case of 'early' DT, as they where using all lug and braze joints in that vicinity on the preceding RA, OB, OC, and TT. It does look professionally done. While it could have been done post-Works, one would have to ask for what gain? I suspect instead it is an experiment by the Works, which could have carried it out with slightly less trouble during original manufacturing, then banished it to Australia when nothing came of it.

It looks as if the engine bearers bent slightly upwards at the front ends (or is it an optical illusion?) I have seen other DTs with jogged engine bearers, both Works and owner modified. Usually the jog is far more significant.

Also of interest is the flattened tube on the upright to provide extra clearance for the rear cylinder exhaust rocker arm.

Howard you do turn up some odd frames!