DIR Return Create A Forum - Home
---------------------------------------------------------
CycleKarts GB
HTML https://cyclekartsgb.createaforum.com
---------------------------------------------------------
*****************************************************
DIR Return to: Build journals
*****************************************************
#Post#: 1215--------------------------------------------------
Re: Bugatti Type 37 Build
By: Slack Alice Date: August 20, 2019, 4:13 am
---------------------------------------------------------
That’s an awful lot of work Stefan! Brilliant job though. The
former would have challenged me!
#Post#: 1222--------------------------------------------------
Re: Bugatti Type 37 Build
By: M.Z.Nahajski Date: August 21, 2019, 3:19 am
---------------------------------------------------------
it looks even better in person. And it didn't take you too long
once you had made a good jig
#Post#: 1430--------------------------------------------------
Re: Bugatti Type 37 Build - shock absorber
By: StefanN Date: September 23, 2019, 6:21 am
---------------------------------------------------------
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.
#Post#: 1431--------------------------------------------------
Re: Bugatti Type 37 Build
By: chrisenamels Date: September 23, 2019, 8:54 am
---------------------------------------------------------
One of these maybe:
HTML https://www.ebay.co.uk/itm/1-4-Shank-Diameter-Hand-Drill-Pump-Micro-Self-priming-Centrifugal-Pump-E2Z9/312749088909?hash=item48d14c608d:g:BbQAAOSwEkJdaGDh.<br
/>It's self priming, along with the inlet and outlet being inlin
e,
suggests it's vane rather than centrifugal.
#Post#: 1432--------------------------------------------------
Re: Bugatti Type 37 Build
By: StefanN Date: September 23, 2019, 9:31 am
---------------------------------------------------------
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.
#Post#: 1442--------------------------------------------------
Re: Bugatti Type 37 Build - kingpin
By: StefanN Date: September 26, 2019, 4:50 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.
#Post#: 1443--------------------------------------------------
Re: Bugatti Type 37 Build
By: ChrisS Date: September 26, 2019, 7:46 am
---------------------------------------------------------
Nice work Stefan, mine are like yours, so I'll do the same!
#Post#: 1444--------------------------------------------------
Re: Bugatti Type 37 Build
By: StefanN Date: September 26, 2019, 10:21 am
---------------------------------------------------------
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.
#Post#: 1573--------------------------------------------------
Re: Bugatti Type 37 Build - cooling
By: StefanN Date: October 28, 2019, 5:57 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.
#Post#: 1865--------------------------------------------------
Re: Bugatti Type 37 Build
By: RhysN Date: January 18, 2020, 1:30 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.”
*****************************************************
DIR Previous Page
DIR Next Page