Armstrong Siddeley Short 20/25 Hp, Series Aa, Ba, Ca, Da, Ea; Long 20/25 Hp Series S, T, U;
& 1st 15 Cars In. V.rich Kwr (1938-39)
The Car
Coming soon
The Specs
Below are the technical specifications and any performance numbers we could get.
Engine
Bore & Stroke | 82.55mm x 114.3mm |
Displacement | 3670.5cc |
Firing order | 1,5,3,6,2,4 |
Oil pressure (hot) | 25 lb./sq. in. |
Fuel Supply
Carburetor | Zenith 42 VEI (Series AA, BA, CA); 1st 98 cars in EDA, S, T, U; 1st 15 cars in VSU Type HV5HL; std needle RJD, weak RK, rich KWR |
Choke | 32mm |
Main | 175 |
Compensating | 100 |
Economy | 185 |
Slow running | 65 |
Valving
Intake tappet clearance | 0.006″ (cold) |
Exhaust tappet clearance | 0.012″ (cold) |
Valve-timing indication | Camshaft and crankshaft sprockets |
Intake valve opens | 5° BTDC (Tappets at 0.0125″ |
Ignition
Breaker gap | 0.015″ |
Plug gap | 0.018″ |
Ignition timing indication | Flywheel and bell housing casing |
Ignition timing |
TDC |
Clutch
Clutch type | ASM Centrifugal, Single dry plate (Series AA & S: Roper & Wreaks S.D.P) |
Clutch linings | Newton Disc |
Brakes
Brake type | Bendix (Cable-operated) 12″d. x 23⁄8” x 3⁄16“ |
Brake linings | (14″: S,T,U & 1st 15 in V) |
Wheel Alignment
Toe-In | 1⁄16″ |
Camber | 2° |
Caster angle | 6°30′ (Series AA,BA,CA: 4°40″) (Series S,T,U, & 1st 15 in V: 3°30′) |
King pin angle | 5° |
Keyword: Armstrong Siddeley Short 20/25 Hp, Series Aa, Ba, Ca, Da, Ea; Long 20/25 Hp Series S, T, U; & 1st 15 Cars In. V.rich Kwr (1938-39)