The first generation Astron II was an improved version of the original Astron which debuted in the late 1970s. The first Astron was revolutionary as it was the first engine to use balance shafts to make the engine feel much smoother.
The Astron II was only available in 2.6 litre form. The 2.6 litre engine was praised for being powerful, economical and refined.
The engine was fitted to all first generation Magnas and carby second generation models. Second generation Magnas fitted with EFI used a revised version of the engine.
Technical Specifications
 A first generation EFI engine in the car
| Type
|
In line 4 cylinder overhead cam with counter balance shafts. Transversely mounted
|
| Displacement
|
2555cc (2.6 litres)
|
| Bore
|
91.1mm
|
| Stroke
|
98mm
|
| Maximum oversize
|
1.00mm
|
| Compression Ratio
|
8.8:1
|
| Firing Order
|
1,3,4,2
|
| Power output (Carby)
|
83 kW @ 5200 rpm, 200Nm @ 2400 rpm
|
| Power Output (EFI)
|
93 kW @ 4800 rpm, 205 Nm @ 2400 rpm
|
| HEAD SPECIFICATIONS
|
| Type
|
Alluminum Alloy with hemispherical combustion chambers and crossflow design
|
| Inlet Valve Diameter
|
46.00mm
|
| Exhaust Valve Diameter
|
38.00mm
|
| Valve Face Angle
|
45 º
|
| Valve Clearance
|
Maintained by hydraulic lash adjusters
|
| CAMSHAFT SPECIFICATIONS
|
| Inlet Opens
|
25º BTDC
|
| Inlet Closes
|
59º ABDC
|
| Inlet Duration
|
264º
|
| Exhaust Opens
|
64º BBDC
|
| Exhaust Closes
|
20º ATDC
|
| Exhaust Duration
|
264º
|
| Overlap
|
45º
|
| Inlet Cam Lobe Height
|
42.50mm
|
| Exhaust Cam Lobe Height
|
42.56mm
|
| Nominal Cam Lift
|
10.50mm
|
|
|
|
