C o m p l e t e  9 6 4

  

Engine

 

Both the Carrera 4 and 2 engines (M64/01) were increased in capacity to 3600cc (up from the previous models 3200cc engines).

Whilst the bore centres were the same as the original 2000cc engine, increased capacity was achieved by enlarging the bores from 95mm to 100mm and the associated stroke from 74.4mm to 76.4mm. This longer stroke naturally required a new crank shaft, which despite a longer throw, was actually 2.2kg lighter than its predecessor. Small air shields were also incorporated onto the crank case shell, thus helping to direct cooling air to the base of the cylinders.

Additional attempts to keep the cylinder heads cooler, resulted in the cylinder heads utilising ceramic port liners (this insulated the cylinder heads from the hot exhaust gases that were in close proximity).

A new 12 blade cooling fan was utilised, and this was driven at the same speed as the 959's- at a claimed ratio of 1.6:1 which resulted in a fan speed 4.2% slower than that of the 3.2 engine.

For the first time, a twin spark ignition system was utilised (with double distributors- the secondary distributor being driven by the first distributor via a small tooth belt mechanism. This allowed the ignition timing to be retarded by 6 degrees over the 3.2 engine, which in turn permitted the compression ratio to be increased to 11.3:1 despite a decrease to 95 RON fuel. The overall impact- an engine with faster combustion and increased engine efficiency.

The engine oil cooler mounted in the engine bay that had been utilised on previous 911's was replaced by an enlarged oil radiator cooler in the front right fender.

Final specs of the engine may be summarised as follows-

  • 250bhp DIN at 6,100rpm

  • 310Nm torque at 4,800rpm

  • Full weight of vehicle 1,430kg vs Carrera 3.2 at 1,210kg

  • 0-100kph in 5.5 seconds

  • 0-160kph in 12.9 seconds (Carrera 2), 13.2 seconds (Carrera 4)

  • 0-200kph in 21 seconds (Carrera 2), 22.1 seconds (Carrera 4)

  • Distance of 1km from standing start 25 seconds

Please note that a discussion on the Turbo engines (3.3 and 3.6) are in development and will hopefully be ready soon.

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The 3.6 engine. Note that the air box can be updated to the 993 air box and air flow system for substantial power gains.

Above engine has Cup bypass pipe replacing the original primary muffler- a common upgrade.