Moskvitch G4

The Moskvitch G4 were sports cars from Moskvitch released in 1963. Like the G3, they used the same engine as the Moskvitch 407, a 1358 cc pushrod four producing 76 PS (56 kW; 75 bhp) at 5500 rpm.^[1] Compared to Western racecars, the G4 was too heavy and suffered from poor aerodynamics.^[2] The G4 used a rigid spaceframe chassis, with aluminium skin.^[3]

In 1965, all three G4's were re-engined with units based on the engine in the Moskvitch 408 and redesignated G4A. The G4A also received smaller, 13-inch wheels in lieu of the earlier, 15-inch units.^[2] While the initial design had been fitted with a quarter of domestically produced Lenkarz-K99M motorcycle carburetors, the G4As were fitted with twin, imported Weber 40DCO carburettors.^[2] The engines also had the valve timing advanced, and new camshafts, giving 81 PS (60 kW; 80 bhp) at 5,600 rpm.

One G4A (the first production G4) was fitted with a larger, 1.5-litre Moskvitch 412-based engine, the DM, rated at 92 PS (68 kW; 91 bhp), becoming the G4M.^[4] During 1967–1968, the two remaining G4A's were converted into G4M's. Two G4M's were rebuilt into Moskvitch G5's in 1968. The third G4M was raced until 1972 – it was not converted to a G5, but it was updated with a twin-cam version of the 412 engine, producing 100 PS (74 kW; 99 bhp).^[4] The G4's had independent suspension, both front and rear (from the Moskvitch 407), and were successful in several USSR championships.