1925 Alvis Mac-Arthur.

MacArthur Racing Alvis 12/50, original and very quick. Tasty history with a very complete dossier including photos of the car from the 30's, 40's and 50's etc. Newspaper articles and a complete manual.
Mac-Arthur, a pilot, won many races at the wheel of this Alvis. He sold it as a road car to Alan GRIFFIN in the States who then reconverted it to it's race spec.

The previous owner, Bran Maile, a talented driver brought the car to the UK then sold it to GROC Racing run by Geoff O'Connel, who spent over 4 years passionately rebuilding her.
ENGINE. 4 cyl. cast iron head, aluminium block and sump, fitted with counterbalanced Phoenix crankshaft and conrods with alloy pistons. Twin pressure fed SU's mounted on a fully balanced inlet manifold, dashboard mounted fuel hand pressure pump, fuel tank with quick action filler cap. Overhead push rod operated valves and single camshaft. The flywheel mounted MGB diaphragm clutch and plate drives a gearbox connected via a Lotus doughnut. Bore and stroke 72 x 110mm, capacity 1791cc. Magneto ignition. Radiator mounted cooling fan.
TRANSMISSION. 4 speed, close ratio, crash gearbox separately mounted with external gear change.
REAR AXLE. ratio 4.55 : 1
CHASSIS & SUSPENSION. Chassis shortened from 9'4" to 8'2". Track 4'2". Front springs semi-elliptic, modified rear suspension of quarter elliptic springs with sliding trunnions. Foot operated cable and rod brakes, as well as an external hand-brake. Hartford shock absorbers front and rear. 18" wire wheels with open Rudge splined hubs fitted with 5.25 x 18" tyres. Grease gun lubrification.
DETAILS OF THE RECENT RESTORATION.
ENGINE. The unit has been rebuilt, which included the following work: overhaul radiator and replumbed cooling water pipework, including replacement of rear engine head to block water manifold, with a stainless steel unit; radiator mounted electric cooling fan fitted; rebuilt SU carbs and new fuel pressure hand pump; rebuilt magneto and starter motor; new choke and magneto advance/retard boeden cables; new alloy pistons, Phoenix crankshaft and conrods, main and big end bearings, rear main bearing oil seal conversion; new camshaft and valve springs; new crankshaft, camshaft and magneto timing gear wheels; new high volume oil pump and oil pump drive shaft; new engine mounting rubbers and bolts; new clutch assembly and prop-shaft doughnut; new Anderson battery jack plug.
REAR AXLE. New crown wheel and pinion assembly, new half shafts, rebuilt wire wheels, brake shoes and hubs - all round.
CHASSIS & SUSPENSION. Rebuilt Hartford shocks - all round.
A proper 1920's racing car in exceptional condition.
On an British logbook but with possibility of French 'Carte Grise'.

JCB racing team