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3.5 Litre

3.5 Litre Desciption

The 3½ Litre or Model SA25.63 was introduced at the 1935 Motor Show for the 1936 season. The second question that a 3½ Litre owner is often asked (after "What Alvis do you own?") is "What is a 3½ Litre?", not very surprising when only 62 examples were produced making it one of the rarest of Alvis models. It is one of the 6-cylinder 'sporting' models that Dave Culshaw has described as being evolved by careful selection from the parts bin. Two 'new' units were in fact employed. The chassis was effectively an Speed 20 SD stretched to 10' 7" wheelbase but retaining the Speed 20 SD back springs (which were lengthened by a foot when the Speed 25 came along) and adding a solid floor plate filling the area between the gearbox and the batteries. The engine (later used for the Speed 25) similarly looks like a stretched Speed 20 unit, with a 7-bearing crank, looking back to that model by not having a thermostat and bypass. Running gear, engine ancillaries and gearbox are shared with other models, but the radiator was about 4" taller than the Speed 20 or 25 and the bodyline therefore that much more imposing. The grille is a bolt-on affair with a large number of narrow vertical slats, easily distinguishable from the other big sixes.

Unlike the Speed 20, the model was available only as a chassis. Coachbuilders associated with Alvis; Mayfair, Mulliner, Charlesworth, Vanden Plas, etc., put out body designs for the new chassis and there are therefore groups of cars which have bodies to the same design, but there were no "off the peg" cars such as were available for the Speed 20 and indeed for the Speed 25. Every body was individually ordered by the customer. Some bodies were one-offs, usually by companies not normally found building bodies for Alvis Cars.

It believed that Alvis were trying to achieve a separation between the "standard" Speed 20 package of chassis and catalogued body and a more powerful chassis that was aimed at clients with a deeper pocket who wanted an individual tribute to their taste and discernment. The extra length and power would give body designers more scope to extend their imaginations. The mixture was perhaps not quite right, especially in the horsepower department, and was made over for the 1937 model season. The Speed 25 SB replaced the Speed 20 as the "off-the-peg" model and the 3½ turned into the 4.3, also only available as a chassis. The power may well have been needed to compete with the likes of Bentley, Talbot and Lagonda; the increasing weight and sophistication of bodywork affecting all makers. Of the 44 3½ Litre bodies of which the style is known, 32 were saloons. It would be interesting to know what the proportion was for Speed 20's, Fireflies and Eagles of the immediately preceding years. Perhaps open body styles were becoming markedly less popular in the mid thirties. If this is so Alvis may have underestimated the need for more power to improve performance while carrying altogether heavier bodies.

Build sheets show that the first delivery from the factory was on the 23rd July 1935 and continued steadily until 25th August 1936. Four months later, on 17th December, a final example was built for Sidney Guy of the Wolverhampton truck-making firm. Why he didn't have a Speed 25 or a 4.3 is not known. The car wears a Charlesworth saloon body with valances in place of running boards, such as did not appear on the Speed 25's until 1939 - another little mystery. (The Guy family are rumoured to still possess documentation on the car; if anyone can turn it up, we may get some answers.)

John Oliveira

Past 3.5 Litre Model Secretary

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