Bugatti straight 8 cylinder with blower, design, 3D printed molds, castings , machining, assembly

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Foketry

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1930 , the Italian Ettore Bugatti built the Bugatti T50 car in France.
It was one of the most beautiful cars built in Europe
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Foketry

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I would like to make a replica, scale 1 / 3.3
Why scale 1 / 3.3 ?
Simply because the bore of the original engine was 86 mm, I would like build a 26 mm bore, (1.023 inch)

705px-Bugatti_50B.jpg


Bug ref (9).jpg
 
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johnmcc69

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That's going to be a big model but a real beauty of one.
Looking forward to your build!

John
 

Rod Cole

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Is there, or will there be scaled down blue-prints for this idea. I think if there were they would sell easy. Such a good looking engine, with an amazing history!!!!!
 

Foketry

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Going to be good Foketry! What have you got for documentation right now?

I thought I recall seeing a model engine, not sure if it was this refernce or not
Thank you for your suggestion
For reference with size I bought on Ebay an old italian kit 1:8 scale, I read that it is one of the most faithful reproductions
Copy of original designs can also be purchased, but each design costs hundreds of dollars.
I am also in contact with Michelko who has already built this model and has given me some dimensions and photos

plastic Pocher reproduction
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michelko

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I will follow this build thread for sure. The link above Shows my Bugatti interpretation also based on the Pocher model.

Unfortenatly i had some problems with the engine. At forst i thought th eplugs where the problem. in the mean time i think it was leaking valves. I am still in the process of reworking the valves. Hope i can start it again soon.

Jules, please keep on posting your progress.

Michael
 

michelko

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Hi Jules,
do plan to use an oilpump for lubrication of the cams? If yes have you thought About the backflow to the sump?

Michael
 

Foketry

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Hi Jules,
do plan to use an oilpump for lubrication of the cams? If yes have you thought About the backflow to the sump?

Michael
yes ,I have already bought and tested a small gerotor Chinese pump , now I'm looking for 3 mm diameter oil seal for valves, in order to avoid that the oil is sucked into the combustion chamber through the valve stem.
Everything is in my mind, but I still have to draw
pump.jpg
 

Foketry

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I will follow this build thread for sure. The link above Shows my Bugatti interpretation also based on the Pocher model.

Unfortenatly i had some problems with the engine. At forst i thought th eplugs where the problem. in the mean time i think it was leaking valves. I am still in the process of reworking the valves. Hope i can start it again soon.

Jules, please keep on posting your progress.

Michael
about the plugs I suggest you use commercial ones with the short thread 1/4 32 or CM6 M10x1 , in the photo of the head at the post #12 you can see the deep holes for plugs

regarding leakage of valves, I use a small manual vacuum pump to do the test after grinding and I make a really small chamfer, max 0.1mm in the edge of the valve cage

I hope this is useful

vacum pump.jpg
 

michelko

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I also purchased this vacuum pump to test the valves after the repair. For the repair i made a cutter with a Pilot pin.

The comercial plugs are t pricy so i decided to make my own. Besides this ist a Hobby a making parts is fun. The plugs worked nice but after some tme they get wet and stoped firing.

Some time i noticed the valves leaking. i bet the maine Problem where the valves.
Still have a new set plugs that i will test when the engine is together again.
That is an cute little pump!!
I did mine as gearpump. Because the hole crank has ball/needlebearings the pump is only used to feed some oil into the head and lubricate the cam and followers.

Michael
 

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