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Author Topic: Bugatti Type 37 Build  (Read 1134 times)

StefanN

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Re: Bugatti Type 37 Build - tail fibreglass
« Reply #60 on: 13 June 2019, 09:21:45 am »
I laid up 3 layers of fibreglass on the polystyrene buck having covered the polystyrene with PVA and ali foil which did a good job of protecting it from the polyester resin.  It’s now set, trimmed and ready to be attached permanently to the rest of the tail.  Filler and sanding will start when the rain stops.

Chris Brown

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Re: Bugatti Type 37 Build
« Reply #61 on: 13 June 2019, 09:34:23 am »
If you mix up 3 parts of gelcoat to one part of laminating resin, you'll get a glazing resin, which will mean you've got a smoother finish to start with.

You'll need to abrade the moulding to give the glaze a key, it's normally applied when the laminating resin has just gelled.
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Slack Alice

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Re: Bugatti Type 37 Build
« Reply #62 on: 13 June 2019, 11:08:22 am »
Looks good Stefan...I’ve been considering how to make the radiator cowling for the GN.
Seems like a lot of work! Have I really got to make a wooden replica and take moulds off etc?
Meanwhile, chassis works continue....!

RhysN

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Re: Bugatti Type 37 Build
« Reply #63 on: 13 June 2019, 03:49:46 pm »
I use a much smaller bubble foam than Stefan used, .
No Slack Alice you do not have to take moulds. The grilles I have made have been foam, and the 2 or 3 layers of close weave fabric, not CSM. A light sand, then skim coat of filler has been more than adequate before paint.
If you are doing it with wood, why even put a layer of glass on top? Use it smoothed off and painted. Some of the pattern maker type timbers (obechi, poplar etc) are very easy to work as you don't have grain to cope with near as much as "soft wood".

StefanN

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Re: Bugatti Type 37 Build - CVT question
« Reply #64 on: 30 June 2019, 09:26:30 pm »
Life's been busy for a couple of weeks so have made limited progress on the CK.  Now of course, it's a mad rush to get ready for Stretton.   I'm stuck on how to make my radiator so it'll just be the wooden buck bolted onto the front.

Need to: fit the tail to the main body, cut various air and clearance holes, paint lots of bits, finish and fit the new exhaust, sort an idle problem, change the throttle cable, change a few nuts to nylocs and finish some jobs on the trailer.  Marek is fed up with sanding but has nearly finished the steering wheel.

So a CVT question.   How wide is the bronze idle bush on your CVT?  Mines about 10mm and sometimes partially slides into the outer section of pulley leaving only about 5mm in the gap.  This should be enough still but I don't understand why it isn't wider.

RhysN

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Re: Bugatti Type 37 Build
« Reply #65 on: 01 July 2019, 06:17:57 am »
What make is the CVT Stefan? With both varieties I have here I can't see how the bush can slide into the outer section as the black bit with ribs on the outside takes all the space.

StefanN

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Re: Bugatti Type 37 Build
« Reply #66 on: 01 July 2019, 07:46:54 am »
It’s a Comet Torque-A Verter TAV2 30.

The keyed and lobed part has two flat sections that key with the outermost metal cone/disc.  It also has a chamfer/taper on the other end.   What I’ve not checked is whether it has to slot into anything on the outer pulley disc.

RhysN

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Re: Bugatti Type 37 Build
« Reply #67 on: 01 July 2019, 08:52:45 am »
First up, ignore my previous. I have just checked, and yes it does slide under the outer cone, but only when it's closed, ie when the belt will be at the "high speed" mode. The sleeve is just there as something for the belt to run on at idle mode.
The keyed and lobed part flats should match the hole in the outer cone which is not a round hole, has matching flats for the other part.

Slack Alice

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Re: Bugatti Type 37 Build
« Reply #68 on: 01 July 2019, 06:05:19 pm »
Hi Stefan...my sleeve measures 1/2 inch.
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StefanN

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Re: Bugatti Type 37 Build - exhaust
« Reply #69 on: 02 July 2019, 06:25:46 pm »
Installed my exhaust today and pushed on with the myriad little jobs that need finishing.
« Last Edit: 02 July 2019, 10:27:17 pm by StefanN »
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StefanN

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Re: Bugatti Type 37 Build - stability
« Reply #70 on: 09 July 2019, 09:35:42 am »
Stretton was the first real test of the Bugatti and it felt a bit unstable at speed and definitely tippy/unpredictable in corners.  So the search for stability starts.   I'll create a topic thread in the Tech Forum for the general discussion.  I'm going to double check the toe-in and castor.

One difference between my CK and many others is that my spring is clamped to a perch on top of the beam axle, rather than hanging below.   The rest of the front geometry means that the chassis rail is level - ie, this is not making my ride height higher than intended.  Given it is all bolted together and the beam drops, I can't see this making any difference, but I'd be interested to hear alternative theories on this question.

StefanN

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Rather than make another hole in the Bugatti tail.  I'm thinking about routing the starter cord to somewhere else - either below the side rail so its under the tail, or forwards to the gap between my back rest and seat cushion, or possibly to the side wall just in front of the tail.   Obviously I'll need to remove the metal cover and create a new hole for the cord to exit from but will be removing that anyway to fit a Hall effect sensor.

Any thoughts?

Chris Brown

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Re: Bugatti Type 37 Build
« Reply #72 on: 09 July 2019, 04:31:11 pm »
When you remove the pull start, you'll find you can reposition it so that the it faces forward without any problem. There are six holes in the pull start housing and at least three threaded bushes in the fan housing. Just remove the bolts and rotate the pull start housing to the position that suits you.
« Last Edit: 09 July 2019, 04:33:21 pm by Chris Brown »

RhysN

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Re: Bugatti Type 37 Build
« Reply #73 on: 09 July 2019, 06:05:21 pm »
All of mine have had the cord through the back rest using what Chris has suggested.