This is a Level 3 performance engine build on a 3.0L engine for a 1970 914-6. We ran this engine in on our dyno, first with PMO carburetors installed. Then we installed KMS engine management system, individual throttle bodies and ran the engine on our dyno again to compare power gain.
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 installed. All valve seats were cut on our Mira precision valve seat cutting machine from Switzerland. New performance valves were installed and valve lengths set. New valve springs were pressure tested and spring heights were set. Deck height and compression ratio were checked and adjusted. Intake manifolds were ported and matched. All bearing clearances were measured and recorded. Upon assembly, we measured and recored all fitment and clearance specifications. We also installed a set of custom headers.
Hp & Torque Specifications
Our Engine – 911 3.0L w/ KMS Fuel Injection: 230 hp and 223 ft. lbs. of torque
Our Engine – 911 3.0L w/ PMO Carburetors: 215 hp and 199 ft. lbs. of torque
911 3.0L Stock: 180 hp and 175 ft. lbs. of torque
After the dyno sessions, 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 end result of this Level 3 performance build with KMS engine management, is a very smooth, reliable street/track engine that is turn key. KMS has great cold start, throttle response, RPM pick up and works great with today’s ever increasing ethanol fuels.
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.
To see the build of this car, click here.
