Shared Left Border

 

 

CARBURETTOR-Rapier III-III A
Make 2 X Zenith    
Type 36-W.I.A. 2 or 36 WIA -3 36 WIA -3  
Settings (Sea level to 4000 ft. [1219 m.]) Series III Series IIIA  
Venturi  28 mm. 29 mm  
Main discharge jet 016289 016289  
Main jet 115 117 NOTE: when a 70 pump jet is used there is a 50 leak hole in the accelerator pump valve suction valve.
By-pass jet ... 65 65
High-speed bleed 180 180
Slow running 50 (36WIA-2)
45 (36WIA-3) 		45
Progression holes 2 X 0-8 2 X 1.0  
Pump let 50 or 70 ** 70  
Air cleaner and silencer Oil bath (twin horn) Oil bath (twin horn)†  
** 70 if 7 mm. radius accelerator pump cam is used or if WIA-3 carburettor is fitted.
† Later models are fitted with a dry (paper element) air clearer

 

Altitude settings (differences above 4,000 ft. [1219 m.])
  4000-ft. (1219 m.)
to
7500 ft. (2288 m.)		 7500 ft. (2288 m.)  
to
10000 ft. (3048 m.) 		10000 ft. (3048 m.)
to
12500 ft. (3812 m.) 		12500 ft. (3812 m.)
to
15000 ft. (4576 m.) 		From  I5000 ft. (4576 m.)
Main jet-Series III 110 107 105 102 100
Series IIIA 112 110 107 105 102
By-pass jet-Series III 62 60 57 55 55
Series IIIA 62 60 57 55 52


COOLING SYSTEM
Type of system   Pump and fan
Type of pump   Centrifugal
  Fan-No. of blades (Alpine) Six
  No. of blades (Rapier) Four
  No. of blades (Alpine III only) Four
  Diameter (Alpine) 12.70 in. (32.3 cm.)
  Diameter (Rapier) 14.5 in. (36.8 cm.)
  Diameter (Alpine III only) 12.5 in. (31.7 cm.)
Drive of pump and fan    "V" belt from crankshaft
Cooling system control   Thermostat
Radiator relief valve   A.C. (in filler cap)
Relief valve operating pressure-Alpine I, II 7 Ibs. in.² (.49 kg. /cm²)
Alpine III, IV 9 lbs. in.²  (.63 kg. /cm²)
Rapier III, III A 4 lbs. in.² (.28 kg. /cm.²)
Rapier IV 9 lbs. in.² (.63 kg. /cm.²)
Fan belt-depth 31 in. (7.9 mm.)
Width at outside 375 in. (9.3 mm.)
Angle of "V" 40º  
Length (outside circumference) 37.25 in. (946.2 mm.)
Thermostat (bellows type) -Opens at (Alpine) 162ºF  (72ºC)
Opens at (Rapier) 176ºF (79ºC)
-Fully open at (Alpine) 185ºF  (85ºC)
Fully open at (Rapier) 199ºF  (92ºC)
Thermostat (wax type)-Opens at (All models) 183ºF (84ºC)
Fully open at (All models)  200ºF (93ºC)


IGNITION SYSTEM
Type of system   Coil and distributor
Firing order   I : 3 : 4 : 2
Ignition control   Fully automatic-Vacuum and centrifugal
*Ignition timing-full retard   5º-7º (6.5-9 mm) B.T.D.C.
(Low comp.: 8º-10º (10.3-12.8 mm) B.T.D.C.)

*Ignition timing-full retard
(from chassis Nos. B.3062930 and B.9118359)

   9º-11º (11.5-14 mm) B.T.D.C.) (all ratios)
*Ignition timing-full retard (Rapier IV)   7º-11º (9-14mm) B.T.D.C.
Ignition timing-full retard (Alpine IV)   9º-13º (11.5-16.5 mm) B.T.D.C.
Distributor- Maker's type Lucas DM.2.P.4 or Lucas 25.D.4
  Maker's despatch No. 40683B (Alpine I Rapier III)
  Maker's despatch No. 40766A or 40799 (Alpine II Rapier IIIA)
  Maker's despatch No. 40924B (Alpine III)
  Maker's despatch No. 40942A (Alpine IV, Rapier IV)
  Drive Skewgear on camshaft and offset coupling
  Direction of drive Anti-clockwise (viewed from above)
  Firing angles 0º, 90º, 180º, 270º ± 10
  Contacts closed period 60º ± 30
  Contact breaker gap -015 in. (.38 mm.)
  Distributor
  R.P.M. Degrees
Ignition centrifugal advance 600 1.5 - 4
(with distributor decelerating on test rig) 1400 8.5 - 10
Despatch No's:- 40683B, 40766A, 40799, 40924B 2200 9 - 11
Ignition centrifugal advance 600 0 - 2
(with distributor decelerating on test rig) 1200  4 - 6
Despatch No:- 40942A 2000 8 - 10
Ignition vacuum advance (all distributors) Hg in (inches of mercury)
  5 0.5º -3º
  7 3º-5º
  8.25 4º-6º
Spark plugs-Make and type (All models except Alpine 111, Rapier IV) Champion N.5**
  Make and type (Alpine III, Rapier IV onwards) KLG.FE75†
  Size 14 mm.
  Gap .025 in. (.63 mm.)
  Coil maker's No. (Alpine I and II) LA.45053E
  Coil maker's No. (Rapier III, Alpine III onwards) HA.45102
     
*The mm. conversion is measured on the periphery of the crankshaft damper. From B.9204755 and B.3300001, 6 extra timing marks at 5º intervals B.D.T.C. have been added.
** For consistent high speed driving use Champion N.3.
† For consistent high speed driving use KLG. FE80.
For racing use KLG. FE100.