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#Post#: 3--------------------------------------------------
Bugatti Type 37 Build
By: StefanN Date: January 1, 2019, 4:43 pm
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OK, so starting our first CK with my son. I've been interested
for a while and then the GB meet at Stretton Circuit 2018 was
the final push.
Our inspiration is coming from the Bugatti Type 37, a well
trodden route for CK's and the quality of some of the cars I've
seen is impressive if a little intimidating. We're lucky enough
to live near the Brooklands Museum so have had a good close look
at the T37 they have there.
#Post#: 20--------------------------------------------------
Bugatti Type 37 Build - mock-up and chassis build
By: StefanN Date: January 9, 2019, 6:14 am
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Have taken the CK from a quick wood and cardboard mock-up that
gave us confidence that our outline design will work, through to
rolling on 4 wheels.
Rear hubs
We got a standard hub from Gemini Karts but with the studs
pulled. The hub has 4 holes on a 100mm PCD.
To allow the hub to fit the wheel we cut about 5mm from the
inside face of the hub. Four M8 bolts then hold the hub and
wheel nicely.
We cut my 50mm length of Oilite bushing into 4 and pressed these
into the wheels using a long bolt, large washers and tightening
the nut. We had to ease the inside of the bushes with some wet
and dry to help them slide onto the axle. We assume they got a
bit compressed when we pressed them into the wheel hubs.
Following advice, we chamfered the edge of the keyway on the
axle where the bushes will be. The wheel spins very smoothly on
the axle with no slop - very pleased. A split collect on the
outside of the wheel keeps it in place with a circlip on the end
for good measure.
The attached sketch shows the set-up.
Front axles
The front axle beam is from Gemini and has 16 deg camber and 5
deg caster. Replaced the bearings on the front wheels with
35/17mm bearings. Turned a stub axle and welded it to the
Gemini yoke at 16 degrees (should have gone for 17 deg for the
tiniest bit of positive camber).
The front springs are 35mm x 4mm x 560mm (and about 80mm drop
from memory), made by Midland Motor Springs. They're held onto
the front axle beam with standard exhaust U-bolts through a bit
of plate.
#Post#: 43--------------------------------------------------
Re: Bugatti Type 37 Build
By: StefanN Date: January 13, 2019, 4:09 am
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Built my rear engine mount inspired by Steve Cole’s design
#Post#: 45--------------------------------------------------
Re: Bugatti Type 37 Build
By: RhysN Date: January 13, 2019, 4:11 am
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:) Steve might tell where he got the concept from. Derek in
Vancouver/Okanagan via me.
Stefan, with your rear hub mounting, if you dress off the small
lip on the wheel you will get a better engineering solution as
the hub will then bolt to a greater matching area.
#Post#: 96--------------------------------------------------
Re: Bugatti Type 37 Build
By: StefanN Date: January 15, 2019, 2:14 pm
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I welded the engine mount into position today and added a domed
bolt to the side to act as a stopper and warning in case the
axle or main drive gear/sprocket move towards the engine mount.
I picked up and old leather armchair from Freegle and stripped
the leather from it. Should be enough to cover the seat
#Post#: 97--------------------------------------------------
Re: Bugatti Type 37 Build
By: RhysN Date: January 15, 2019, 3:04 pm
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That's a good idea Stefan, now for the other side?
#Post#: 116--------------------------------------------------
Re: Bugatti Type 37 Build
By: StefanN Date: January 19, 2019, 3:18 pm
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I had planned to copy Geoff and use a hand drill as a steering
mechanism. I ordered a drill on eBay but when it arrived
realised that the pinions were aluminium and I thought they were
unlikely to last long. So I put a request out on Freegle and
was offered a drill. This turned out to be a lovely old Record
drill - too good to cannibalise. I got chatting with the guy
who had offered me the drill and interestingly he is building a
plane in his garage. Anyway, I decided to try the angle
grinder idea that Rhys mentioned and am pretty pleased with the
result.
Also, roughed out the main formers and the floor so the CK's
shape is starting to emerge. A good day.
#Post#: 117--------------------------------------------------
Re: Bugatti Type 37 Build
By: RhysN Date: January 20, 2019, 12:08 am
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That's looking really good Stefan.
#Post#: 118--------------------------------------------------
Re: Bugatti Type 37 Build
By: ChrisS Date: January 20, 2019, 1:55 am
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Love the angle grinder idea, what did you use a 4.5 or 9inch?
#Post#: 120--------------------------------------------------
Re: Bugatti Type 37 Build
By: StefanN Date: January 20, 2019, 2:45 am
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It’s from a 4.5” grinder that was “not working” (Freegle again).
Removing the armature was a bit of a pain but just took time
with a hacksaw. There was also quite a lot of backlash which
turned out to be a loose key in the larger wheel.
There are so many premade mounting points and on this particular
one the handles came out at 90 degrees so I’ve got two threaded
M8 holes I will use to mount it with.
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