This is a Level 1 performance engine build on a 1983 911SC 3.0L engine. The engine had broken head studs and was ready for a full rebuild. New Euro Mahle pistons and cylinders were installed and the fuel system was upgraded to a Euro spec fuel distributor. The exhaust was updated to SSI heat exchangers and a sport muffler. We then set up and broke in this engine on our engine dyno.
We first evaluated and disassembled the engine. This evaluation helps us to determine the extent of build needed and also enables us to address the owner’s build preferences. All components were cleaned, then fully evaluated, tested and measured. The camshafts, rockers and connecting rods were all in need of reconditioning. All crankcase and crankshaft oil port plugs were removed to properly clean the oil passages. We then installed new oil port plugs and micro polished and balanced the crankshaft. The intermediate shaft was replaced, as well as the timing chains, ramps, tensioners and sprockets. New Euro 3.0 Mahle pistons and cylinders were installed, along with ARP head studs and rod bolts. The pistons were balanced as well as the connecting rods end to end. The cylinder heads were resurfaced and new valve guides were installed. Then all valve seats were cut on our Mira precision valve seat cutting machine from Switzerland. New performance valves were installed and valve lengths were set. New valve springs were pressure tested and spring heights were set. Deck height and compression ratio were checked and adjusted. The fuel distributor, warm up regulator, ignition distributor, CDI box, intake assembly, alternator and alternator fan and housing, were all rebuilt. The wiring harness connectors and contacts were all cleaned or replaced. The engine tin was all repaired and powder coated. All bearing specification were checked and recorded. Upon assembly, we measured and recorded all fitment and clearance specifications. SSI heat exchangers were installed with a sport muffler.
Below are specifications of this engine after set up and break-in on our engine dyno, as well as comparisons to stock specifications.
Hp & Torque Specifications
Our engine – 3.0L 911: 192 hp at 6,000 rpm and 211 ft. lbs. of torque at 4,200 rpm
Stock 911 3.0L: 180 hp and 175 ft. lbs. torque
After the dyno session, we changed the oil and filter, took an oil sample, re-torqued the cylinder heads, adjusted the valves and went over engine set up again. The owner was given a maintenance interval protocol to follow for proper care of the engine during the remainder of the break-in period.
The transmission was fully disassembled, cleaned and checked. All worn, synchros, sliders, guide teeth, and bearings were replaced with new factory Porsche parts as needed.
The dyno test was performed on a Go Power Dynamometer with Land and Sea Data Acquisition Software. The Go Power dynamometer records in DIN hp.
Below are galleries of the engine and transmission build.
A video of this engine on the dyno is featured below the engine gallery.
Engine Build
Transmission Build
