Interesting reading if you care....lol.
Aluminum 215
From 1961-1963, Oldsmobile manufactured its own version of the
Buick-designed, all-aluminum
215 engine for the
F-85 compact. Known variously as the Rockette, Cutlass, and Turbo-Rocket by Oldsmobile (and as Fireball and Skylark by Buick),
[8] it was a compact, lightweight engine measuring 28 in (71 cm) long, 26 in (66 cm) wide, and 27 in (69 cm) high (same as the
small-block Chevy),
[9] with a dry weight of only 320 lb (150 kg).
[10] The Oldsmobile engine was very similar to the Buick engine, but not identical: it had larger wedge(rather than hemispherical)-shaped
combustion chambers with flat-topped (rather than domed) pistons, six bolts rather than five per cylinder head, and slightly larger intake valves; the valves were actuated by shaft-mounted rocker arms like the Buick and Pontiac versions, but the shafts and rockers were unique to Oldsmobile. With an 8.75:1 compression ratio and a 2-barrel carburetor, the Olds 215 had the same rated hp, 155 hp (116 kW) at 4800 rpm, as the Buick 215, with 220 ft·lbf (300 N·m) of torque at 2400 rpm. With a 4-barrel carburetor and 10.25:1 compression, the Olds 215 made 185 hp (138 kW) at 4800 rpm and 230 lb·ft (310 N·m) at 3200 rpm with a manual transmission. With a 4-barrel carburetor and 10.75:1 compression, the Olds 215 made 195 hp (145 kW) at 4800 rpm and 235 lb·ft (319 N·m) at 3200 rpm with an automatic. The Buick version was rated at 200 hp with an 11to1 compression ratio.
The basic Buick/Olds 215 V8 went on to become the well known
Rover V8, which still remains in limited production. The Range Rover V8 utilized the Buick-style pistons, heads, and valve train gear.
The Oldsmobile engine block formed the basis of the
Repco 3-liter engine used by
Brabham to win the
1966 and
1967 Formula One world championships. The early Repco engines produced up to 300 bhp (220 kW), and featured new SOHC cylinder heads and iron cylinder liners. The 1967 and later versions of the Repco engine had proprietary engine blocks.
In the mid-1980s,
hot rodders discovered the 215 could be stretched to as much as 305 cu in (5 l), using the Buick 300 crankshaft, new cylinder sleeves, and an assortment of non-GM parts.
[11] It could also be fitted with high-compression
cylinder heads from the
Morgan +8. Using the
5 liter Rover block and crankshaft, a maximum displacement of 317.8 cu in (5,208 cc) is theoretically possible.
[12]
[edit] Turbo Jetfire
In 1962 and 1963 Oldsmobile built a
turbocharged version of the 215. The small-diameter Garrett T5 turbocharger with integral wastegate was manufactured by
Garrett AiResearch and produced a maximum of 5
psi (34
kPa) boost at 2200 rpm. The engine had 10.25:1 compression and a single-barrel carburetor. It was rated at 215 hp (160 kW) at 4600 rpm and 300 lb·ft (410 N·m) at 3200 rpm. In development, the high compression ratio created a serious problem with
spark knock on hard throttle applications, which led Olds to use a novel water-injection system that sprayed metered amounts of distilled water and
methyl alcohol (dubbed "Turbo-Rocket Fluid") into the intake manifold air-stream to cool the intake charge. If the fluid reservoir was empty, a complex double-float and valve assembly in the Turbo-Rocket Fluid path would set a second butterfly (positioned between the throttle butterfly and the turbocharger) into the closed position, limiting the amount of boost pressure. Unfortunately, many customers did not keep the reservoir filled, or had mechanical problems with the turbocharger system which resulted in many of the turbo-charger installations being removed and a conventional 4 barrel carburetor and manifold installed in its place.
The turbocharger was offered only in a special Jetfire model, which was the second turbocharged passenger car offered for public sale. The Chevrolet Corvair Spyder Turbo also manufactured by GM was ahead the Oldsmobile Jetfire Turbo by only a few weeks. Only 9,607 were sold in two model years, and many were converted by dealers to conventional four-barrel carbureted form.