I think Joyces 100 in the hour car, used the Hawker chassis, with parallel front springs, and the 16v engine, certainly the Hawker body. The lightweight sprinter had splayed front springs, one of the 200 mile race chassis, perhaps a mix of parts by this time. One chassis went to Raymond Mays for the supercharged hill climb car, this may have been the ex Hawker chassis, must look out my pictures. The lightweight sprinter was sold to Jack Ackhead, a garage proprieter at Southport, and raced on the sands. Did the sprinter have two incarnations, single and two seater, or were there two cars built? One of the three 200mile race cars was crashed, upside down off the track at Brooklands, so may have been then uncerviceable, leaving two more cars to use for later events.
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Is this chassis number unknown?
One of the AC works racecars, here being driven by John Joyce on the Brooklands Test Hill in 1925.
This is the same car that averaged 100mph for an hour at Brooklands driven by Joyce, (which means, at times, it was likely to have been travelling at around 115mph). The car also contested the Junior Car Club 200-mile racing in 1922 and ’24, finishing third on both occasions. It won the Brighton Speed Trials two years in a row and held the test hill record for many years.
AC sold the car in the mid/late 1920's and it was only used for a couple more years. From 1929 to the early 1960s it was left in storage before being dug out to go back racing again in the hands of Denis Jenkinson (the same, who co-partnered Moss in the Mercedes 300SLR in the Mille Miglia).
This was another car that was displayed at the ACOC centenary event in Thames Ditton.
I’ve never seen a chassis number so assume, as one of a small batch of race-cars, it was effectively a one-off (the chassis was far from being ‘standard’ anyway being drilled everywhere for lightness).