Sunbeam Thirty

1936

 

 

The first Rootes Sunbeam was designed by Georges Roesch as Rootes’ flagship. A new 4503cc straight eight engine was designed for the Thirty. It developed 150bhp @ 4500rpm. A four speed gearbox was fitted, without syncromesh on first.

The chassis was based on that of the large Humbers of the period.

It appeared at the Olympia Motor Show in 1936. It was then decided not to put the Thirty into production. The four cars built were all broken up.

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3 thoughts on “Sunbeam Thirty

  1. Archie Marshall

    The car shown above was the Sunbeam Thirty Continental Phateon. It was certainly not broken up, it was converted to Humber Imperial Cabrio and i am the proud possesor of the car !! It was delivered to Mr V.P. Mobbs, the original purchaser whose name appears on the handwritten records of Thrupp & Mabberley. I am currently having the car fully restored and the interior and hood are nearly completed.
    The car i have is certrified in writing by the Science Museum in London as being the same car converted from Sunbeam to Humber by Thrupp,s Photos and all 1936 Motor Show erecords are all in my possesion.
    Any informatioon would be greatly appreciated,

    Archie Marshall
    Perth Australia.

    Reply
    1. Stephen Moore

      I am interested in learning certain details about the engine of the Sunbeam Thirty. In particular, can you advise the following?

      Bore & Stroke
      Number of main bearings
      No. of valves per cylinder
      No. of spark plugs per cylinder
      No. of carburettors
      Configuration of block, I presume it was a monobloc casting?

      many thanks

      Reply
  2. archie marshall

    The engine fitted to the car on being converted by Rootes is the stasndard Humber Side Valve 6 cyl engine.
    I imagine you want to know the detasils of the original Sunbeam Thirty engine which was an 8cyl OHV engine?
    I can look up that information or i can copy the original documents and send to you ?
    please advise,
    regards,
    Archie W. Marshall

    Reply

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