camshaft drives

davids · **Joined:** Sat Dec 05, 2009 3:10 pm **Posts:** 143

I understand the single overhead camshaft drive through bevel gears...but how is the twin cam engine driven ? I can't find pictures of how..is it through bevel gears...or chains or etc...
sorry if this is basic stuff..ou je suis nul.!

stevehuckss396 · **Posted:** Thu Feb 04, 2010 3:10 am

davids wrote:

I understand the single overhead camshaft drive through bevel gears...but how is the twin cam engine driven ? I can't find pictures of how..is it through bevel gears...or chains or etc...
sorry if this is basic stuff..ou je suis nul.!

I believe there is a cluster of gears that tie the 2 cams together.

Herman · **Posted:** Thu Feb 04, 2010 8:10 am

On the type 50 the crankshaft drives a vertical shaft, which ends on a large gear. That gear drives the camshaft, but with a smaller gear in between, to cover the distance.

i will see if I can put up a photo.

Uwe · **Joined:** Wed Aug 22, 2007 1:12 pm **Posts:** 2285

Type 59

Attachment:

T59GP.jpg [ 94.67 KiB | Viewed 10381 times ]

davids · **Joined:** Sat Dec 05, 2009 3:10 pm **Posts:** 143

Thank you for the explanation and drawing.
I couldn't visualise how a vertical shaft with bevel gears as in the t35 could transmit to two camshafts..
now I see its all done with cogs.
David.

Bugwrench · **Joined:** Mon Jan 07, 2008 6:16 pm **Posts:** 338

Totally wrong!
Drawing shows a T59 engine!
T51 uses the T35 vertical drive and in top the drive is by gears to the cams.
Bugwrench

davids · **Joined:** Sat Dec 05, 2009 3:10 pm **Posts:** 143

It is not specific to a type but I do try to visualize this in my mind as to how it goes from a t35bevel drive to straight gear drives and twin camshafts....
I have neither type - its just an interesting concept to while away sleepless moments effectively..
Thank you for all your posts..

bietbert · **Joined:** Fri Sep 05, 2008 1:16 am **Posts:** 33

Hi,

have a look on the Crosthwaite and Gardiner online catalogue: http://www.crosthwaiteandgardiner.com/B ... 35_T51.pdf
and go to pqge 4. There you can see a drawing and a picture of the whole mechanism. It'll be better than any explanation.

bietbert

Herman · **Posted:** Sun Feb 07, 2010 4:20 pm

I couldn't do any better.

GCL-Wales · **Joined:** Thu Jun 26, 2008 5:17 pm **Posts:** 348

See also page 113 of Price's "Bugatti Type 46 & 50".

Perhaps Bugwrench would be able to comment on the two commonly expressed opinions that :

1) the type 51 cylinder head was virtually an exact copy of the Miller in terms of internal dimensions.

2) that very little design work was necessary to adapt the Miller design to fit onto type 35 and type 50 bottom ends.

Uwe · **Joined:** Wed Aug 22, 2007 1:12 pm **Posts:** 2285

GCL-Wales wrote:

1) the type 51 cylinder head

A cylinder head is removable :evil:

Lazarus · **Posted:** Sun Feb 07, 2010 10:31 pm

GCL-Wales wrote:

See also page 113 of Price's "Bugatti Type 46 & 50".

Perhaps Bugwrench would be able to comment on the two commonly expressed opinions that :

1) the type 51 cylinder head was virtually an exact copy of the Miller in terms of internal dimensions.

2) that very little design work was necessary to adapt the Miller design to fit onto type 35 and type 50 bottom ends.

[1] The important parts of any head design are the ports and combustion chambers.The Miller is almost exactly copied in the T51.Even the followers can be interchanged.[2] The conversion was a very easy one.I have always wondered why Bugatti did not do the same thing for the four cylinder motor T37/40.I suppose it was too late as the four cylinder cars were to be abandoned for nearly ten years.

christian · **Joined:** Fri Feb 12, 2010 6:50 pm **Posts:** 5

The twin camshaft are driven by a series of gears on the back of the engine for 57's and 59's, engines designed first hand as twin camshaft. The arrangement for type 50 and 51 is of a different nature as the base of those engines were initialy single camshatfs, eg repsectively type 46 and type 35. The driven in this case is at the front of the engine, bevel gear from crank shaft then again bevel gear in seperate casing, than series of three straight gears to get to the camshaft. A good book well illustrated and explaining this is "Bugatti Doubles Arbres" by Robert Jarraud.

Christian

Herman · **Posted:** Sun Feb 28, 2010 12:03 pm

Lazarus wrote:

GCL-Wales wrote:

See also page 113 of Price's "Bugatti Type 46 & 50".

Perhaps Bugwrench would be able to comment on the two commonly expressed opinions that :

1) the type 51 cylinder head was virtually an exact copy of the Miller in terms of internal dimensions.

2) that very little design work was necessary to adapt the Miller design to fit onto type 35 and type 50 bottom ends.

[1] The important parts of any head design are the ports and combustion chambers.The Miller is almost exactly copied in the T51.Even the followers can be interchanged.[2] The conversion was a very easy one.I have always wondered why Bugatti did not do the same thing for the four cylinder motor T37/40.I suppose it was too late as the four cylinder cars were to be abandoned for nearly ten years.

Why did Bugatti never reach the amount of HP that the Millers gave?

brucerudin · **Joined:** Sun Aug 30, 2009 1:15 am **Posts:** 5

Enclosed is a photo of the Type 50 tower drive. It is part of the Ray Jones recreation of the 1937 ACF Type 57S45. Effectively a Type 59 chassis with 57S45 gearbox and Type 50B engine. I enclose photos of the car as it is currently. I purchased it last year and hope to have it completed in 2011. Should be quite a site on the road, as there is likely no one currently alive that saw the original car run in period.

camshaft drives

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