Larry's Engine Guide

Larry charts the changes in the classic 900 engine lineup:

1979-1980: 'B' engine - steel valve cover, water pump and distributor driven by accessory shaft in block. 8 valves. Bosch CIS injection (K-jetronic) 110-118hp n/a, 135 hp turbo
1981-1988: 'H' engine - alloy valve cover. Distributor in valve cover driven by camshaft directly. Water pump driven by alternator belts. COnsiderably lighter than 'B' motor. 8 valves. Bosch CIS injection (K-jetronic) 110-118hp n/a, 135 hp turbo
1985-1993/4: '16valve' engine. Derivative of 'H' block. Major difference - 4 valves per cylinder...Starter moved to inlet side of block in 1986. Bosch LH-Jetronic injection (several variations) 160-185hp turbo, 125-128 hp n/a. Originally a turbo only in 85, 86 had the n/a motor in the 'S'. 89 saw the n/a in the base car as well.
1991-1993/4: 2.1 liter motor - normally aspirated only 140 HP.