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post #7 of (permalink) Old 01-28-2019, 02:30 PM
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Originally Posted by tubut View Post
As I had the luck to be following the restoration of the 8C 2900B that won Pebble Beach last year, I believe I can share some of Simon Moore's notions regarding Porsche (and add some of my own).

It appears that Alfa realized in late 1934, as production of the 8C 2300 wound down, that a new suspension design was necessary to stay competitive (both in races and in the top-of-the-line sportscar market), and so Jano began a new design for an independent suspension of all four wheels.

There seem to be two Porsche project numbers that pertain to Alfa Romeo (project #63 for the front suspension, and project #69 for the rear suspension), but, while Simon Moore indicated at some point that Porsche sold rights to Alfa, I was told by people doing research in the Porsche archives that there seems to be no documentation about the exact scope of work and/or Porsche's involvement in the suspension design. Then again, Simon mentioned an original drawing dated 01-May-1935 that I have not seen, and to me it's unclear whether that was a Porsche or Alfa Romeo drawing.
Very interesting. Note also that Porsche was a fan of swing axle rear suspension, and I think, the 8C 2900B uses that concept.

The situation gets even murkier when one takes into consideration the "knee action" front suspension design patented by André Dubonnet and compares it to the 8C 2900 front suspension
Some P3's were fitted with the Dubonnet independent front suspension.

Ferdinand Porsche was a consultant engineer, so I guess it is not impossible that Alfa Romeo consulted him. He was renown as a suspension designer, although drivers of the Auto Union might disagree with that

Note also many racing cars of that period had front suspension like that (BRM v16, and of course the 158/9 Alfetta, both a long time later to name a couple). I think other than the Dubonnet system it was one of the early independent front designs.

'71 1750 Series 2 GTV:
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156 Series 1 v6 ... and remember it's all just opinions
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Last edited by PSk; 01-28-2019 at 02:34 PM.
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