+-

+-User

Welcome, Guest.
Please login or register.
 
 
 
Forgot your password?

Recent Posts

New member henryhowlett@yahoo.co.uk by CKGB
29 September 2020, 05:36:01 pm

Re: Trailer Help by TheGiantTribble
29 September 2020, 09:36:29 am

Re: Trailer Help by Marek.Z.N
28 September 2020, 09:20:18 pm

Re: Trailer Help by TheGiantTribble
28 September 2020, 09:03:53 pm

Re: Trailer Help by Chris Brown
28 September 2020, 06:15:32 pm

Re: Maserati CT8 build by dunworkin
28 September 2020, 10:34:16 am

Re: Trailer Help by StefanN
28 September 2020, 10:20:17 am

Trailer Help by TheGiantTribble
28 September 2020, 10:07:40 am

Nomex boiler suit by StefanN
28 September 2020, 10:05:13 am

Re: Delage 15-S-8 by Marek.Z.N
28 September 2020, 09:28:11 am

Top Boards

Board Topics Posts
Build journals New 24 874
Tech Forum New 101 788
Events New 54 521
Members New 109 319
Off Topic New 35 183
Where to get stuff New 26 150
For sale and wanted New 23 69
Start Here New 7 24
CK number register New 6 20
Announcements New 9 9

Top Topics

Views Replies
Dodge baquet ish build. 86877 129
Delage 15-S-8 42095 161
Article in the Parish Magazine 28957 6
Bugatti Type 37 Build 27929 142
Napier 1903 Gordon Bennett 23546 59
Whilton mill kart track practice days. 18494 31
Builders Meeting. Coventry Transport Museum. Saturday February 1st 2020. 16856 31
Brakes 16804 39
Helping the builders who have yet to start 16584 8
CK 1 (ERA) build 14720 53

Author Topic: Bugatti Type 37 Build  (Read 27929 times)

StefanN

  • Administrator
  • Sr. Member
  • *****
  • Posts: 406
  • Location: Bagshot, Surrey, United Kingdom
    • View Profile
I took the lip off the inside face of the pit bike wheel SDG hub.  This means the hub from Gemini and the inside face of the wheel hub sit flush to each other - a better solution I think.

RhysN

  • Hero Member
  • *****
  • Posts: 595
  • Location: Tamworth
    • View Profile
Re: Bugatti Type 37 Build
« Reply #76 on: 21 July 2019, 08:56:51 pm »
I agree that's a much better idea. It only takes a few minutes with a flap disc on the grinder too. Do you have a support for the axle at the outboard side of the wheel Stefan?

StefanN

  • Administrator
  • Sr. Member
  • *****
  • Posts: 406
  • Location: Bagshot, Surrey, United Kingdom
    • View Profile
Re: Bugatti Type 37 Build
« Reply #77 on: 22 July 2019, 11:37:09 am »
Do you have a support for the axle at the outboard side of the wheel Stefan?
Both inside and outside.  My original thought was to only drive one wheel.  I couldn't find 35mm OD/25mm ID bearings (except v expensive ones) and given the freewheel only moves a bit relative to the axle I made up Oilite bushes to replace both the bearings.  These hold the wheel nicely on the axle.  The Gemini wheel hub helps to prevent the wheel from sliding along the axle and also transfers the rotational torque to the wheel.

I have been considering how to improve this set-up, although so far what I've got seems to be working.  The central bore on the SDG hub tapers to a 25mm hole (sometimes just under) and the outside of that section is roughly parallel at approx 40mm diameter.  Unfortunately the inside is a cast finish and so not a surface it would be easy to mate up against.
« Last Edit: 04 August 2019, 08:29:06 am by StefanN »

RhysN

  • Hero Member
  • *****
  • Posts: 595
  • Location: Tamworth
    • View Profile
Re: Bugatti Type 37 Build
« Reply #78 on: 22 July 2019, 12:01:41 pm »
I just spent a lot of time with files, dremels and such to go right through. My outside bushes for Kim were steel as I never intended one wheel drive, mounted where the bearings would normally seat. Because the axle (ex hire kart) was 30 mm it took a lot of time, and turned out unbelievably true when the bushes were installed.
I do think the axle needs to go right to the outside to support the wheel more positively, and then the hubs are really left to only support the inside, and to drive.
On the outside I drill and tap into the end of the axle, then a heavy washer (or my cast knock offs) can be tightened against a lock collar inboard of the hub. Belts and braces.

StefanN

  • Administrator
  • Sr. Member
  • *****
  • Posts: 406
  • Location: Bagshot, Surrey, United Kingdom
    • View Profile
Re: Bugatti Type 37 Build - Bonnet hinge
« Reply #79 on: 20 August 2019, 09:07:42 am »
I couldn't find a bonnet hinge in the right size at a reasonable cost so made one out of 50mmx40mm pieces of 1mm aluminium.  The rod is 6mm.

Slack Alice

  • Full Member
  • ***
  • Posts: 147
  • Location: Newcastle upon Tyne
    • View Profile
Re: Bugatti Type 37 Build
« Reply #80 on: 20 August 2019, 10:13:22 am »
That’s an awful lot of work Stefan!  Brilliant job though. The former would have challenged me!

Marek.Z.N

  • Full Member
  • ***
  • Posts: 198
  • im making a delage 15-S-8
  • Location: Bagshot, Surrey
    • View Profile
Re: Bugatti Type 37 Build
« Reply #81 on: 21 August 2019, 09:19:28 am »
it looks even better in person. And it didn't take you too long once you had made a good jig

StefanN

  • Administrator
  • Sr. Member
  • *****
  • Posts: 406
  • Location: Bagshot, Surrey, United Kingdom
    • View Profile
Re: Bugatti Type 37 Build - shock absorber
« Reply #82 on: 23 September 2019, 12:21:18 pm »
I want to add shock absorbers but need to make a decision.  Should I go with:

- A Bugatti style drum with spring loaded friction band on the inside.
- Hartford style shocks which were fitted to some Bugattis because the standard drum had almost no adjustment
- An hydraulic vane, disguised as a Bugatti drum - which will give the best performance but be the hardest to make (or can someone think of a shortcut to create this?)
- Some other option

I think I want to go with the third option because it'll look right but should perform well, but would love to find something I could modify rather than make it from scratch.

Chris Brown

  • Sr. Member
  • ****
  • Posts: 280
  • Location: Llangadog
    • View Profile
Re: Bugatti Type 37 Build
« Reply #83 on: 23 September 2019, 02:54:43 pm »
One of these maybe: https://www.ebay.co.uk/itm/1-4-Shank-Diameter-Hand-Drill-Pump-Micro-Self-priming-Centrifugal-Pump-E2Z9/312749088909?hash=item48d14c608d:g:BbQAAOSwEkJdaGDh. It's self priming, along with the inlet and outlet being inline, suggests it's vane rather than centrifugal.

StefanN

  • Administrator
  • Sr. Member
  • *****
  • Posts: 406
  • Location: Bagshot, Surrey, United Kingdom
    • View Profile
Re: Bugatti Type 37 Build
« Reply #84 on: 23 September 2019, 03:31:19 pm »
Pumps, now that’s a thought.  I’ve not the maths yet but suspect it needs to handle quite a lot of torque.  If not I’d be tempted to try a 3D print.

StefanN

  • Administrator
  • Sr. Member
  • *****
  • Posts: 406
  • Location: Bagshot, Surrey, United Kingdom
    • View Profile
Re: Bugatti Type 37 Build - kingpin
« Reply #85 on: 26 September 2019, 10:50:15 am »
I've finally resolved the play in the Bugatti's king pins.  It took a while because I hadn't figured out how the design is intended to work on the front axle I bought.

The beam axle has the king pin tube welded on at the required king pin inclination and caster.  Two flanged bushes push into the ends of this and a thick spacer tube fits through the middle.  The C-shaped yoke for the wheel spindle then fits over this and a bolt goes through the yoke, through the middle of the spacer tube and through the yoke at the bottom of the yoke (see the drawing).   The holes in the yoke are clearance holes for the bolt and there's nothing special about the tolerances on the bolt - it's just a high tensile M10 bolt.

What you need to do is torque the bolt down so that the spacer tube and yoke are firmly fixed together and essentially the space tube is the king pin.  This then rotates inside the bushes.  Obvious now but, this depends on the spacer tube/king pin being long enough to just clear the bush flanges otherwise the whole lot just binds up which is what was happening to my set-up.

So, I took a bit of thickness from the flange on the bushes and now it turns smoothly without any noticeable play.

ChrisS

  • Full Member
  • ***
  • Posts: 138
  • Location: Crowborough, East Sussex
    • View Profile
Re: Bugatti Type 37 Build
« Reply #86 on: 26 September 2019, 01:46:01 pm »
Nice work Stefan, mine are like yours, so I'll do the same!

StefanN

  • Administrator
  • Sr. Member
  • *****
  • Posts: 406
  • Location: Bagshot, Surrey, United Kingdom
    • View Profile
Re: Bugatti Type 37 Build
« Reply #87 on: 26 September 2019, 04:21:53 pm »
Earlier in the quest to fix the problem I swapped the nylon bushes for Oilite ones.  Don't think this was necessary but hopefully they'll wear a bit better....if only I got to drive enough to wear it out! ;)   Gemini now offer an option with bearings where I presume the spacer tube presses onto the centre race of the bearing achieving the same result but smoother because its a bearing.  Marek's Delage will have these and I think he's planning on assembling the front axle this weekend so we'll find out then.

StefanN

  • Administrator
  • Sr. Member
  • *****
  • Posts: 406
  • Location: Bagshot, Surrey, United Kingdom
    • View Profile
Re: Bugatti Type 37 Build - cooling
« Reply #88 on: 28 October 2019, 10:57:57 pm »
Did a couple of small jobs today.   I added a baffle above the silencer to deflect the heat out from the tail section.  The baffle also extends below the chassis so I'm hoping it'll scoop some cooler air up in the the tail section.

I changed the spring position on the driven pulley on the Comet Torque-a-verter.  Interestingly this was in position 1 but default - I've moved it to position 3 which I'm hoping will help to keep it in a higher ratio for longer.

Lastly, I wanted to install the fresh air ducting to the engine fan but I couldn't figure out where to route the duct so will have another go at that later in the week.

RhysN

  • Hero Member
  • *****
  • Posts: 595
  • Location: Tamworth
    • View Profile
Re: Bugatti Type 37 Build
« Reply #89 on: 18 January 2020, 07:30:42 pm »
As my newest project (full size) becomes a whole lot nearer I've been resarching. Thought this might beof interest.
 legendary Types 35 and 51 used shock absorbers which had to be greased. (The French
term 'amortisseurs', or 'deadeners' is more accurate.) The Bugatti shock absorber was a small drum
brake, with a single almost circular unlined cast iron shoe which was permanently in contact with the
drum. An expander device was used to increase or decrease the 'braking' effort. On some of the
attached photos a grease nipple can be seen near the edge of the damper backplate. (The usual
1920s flat-top hexagonal type known as 'plug type', or 'Stauffer Type' in the USA.) I imagine these
devices although ingenious were rather messy when in regular use, which could explain why the dry
friction Hartford type are often used instead. There used to be a bench-mounted Bugatti shock
absorber set up for visitors to try in the Bugatti Trust building at Prescott a few years ago.
Fortunately, I happened to be there when Ivan Dutton, Morgan Aero (3W) driver and Bugatti expert
was on hand to explain. He said the damping was entirely due to shear in a film of grease, but many
of the original dampers had been run dry and wrecked. Unfortunately, there were owners who
thought they were intended to run dry. I thought, this is beginning to sound familiar! The feel of the
Bugatti device is similar to a Hartford, but with less 'stick' at the end of the travel.”