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° |
