DSPORT Magazine technical showcase editorial on EVO 4G63 camshaft options

INTAKE EXHAUST
CAM TIMING EVENTS
Centerline 109° 111°
Valve Opening @ 1.0mm 12.5 ATDC 31.25 BBDC
Valve Opening @ 0.050″ 15.0 ATDC 27.75 BBDC
Valve Closing @ 1.0mm 32.5 ABDC 17.25 BTDC
Valve Closing @ 0.050″ 21.0 ABDC 20.75 BTDC
DURATION
Actual Duration @ 1.0mm 199.9 194.0
Actual Duration @ 0.050″ 193.0 187.0
Claimed Duration @ 1.0mm N/A N/A
PEAK LIFT
Peak Valve Lift 10.0mm (0.393″) 9.5mm (0.373″)
Peak Cam Lift 5.8mm (0.228″) 5.5mm (0.215″)

Manufacturer’s Pitch

The factory cams do a sub-par job of extracting maximum performance from the engine. Any 4G63 build with even a factory turbo can benefit from cam upgrades.

INFO

The factory Mitsubishi EVO 8 camshafts provide a smooth idle, clean emissions and decent performance at factory boost and power levels. However, there is a significant amount of power to be gained with upgraded aftermarket camshafts. Running E85, the factory camshafts allowed our engine/turbo combination to produce just under 445 wheel horsepower at 21.5psi of boost pressure. This was running a lambda of 0.85 (gasoline equivalent of 12.5:1 A/F ratio). Comparing the stock cam to the offerings from Kelford show the massive performance gains to be realized with a performance set of cams.


RUNDOWN

DSPORT Magazine technical showcase editorial on EVO 4G63 camshaft optionsDSPORT Magazine technical showcase editorial on EVO 4G63 camshaft options

451.5 WHP @ 7,000 RPM
359.3 LB-FT @ 5,500 RPM

Peak power checked in at 7,000 RPM with a drop in power as engine RPM moved past this point. Peak boost was reached at about 4,500 RPM. A flat torque band from 4,500 to 7,000 RPM delivered over 320 lb-ft of torque. Peak torque came in at 5,500 RPM. Highest VE values were recorded at 3,500 RPM. The 4,000 and 4,500 RPM VE figures were lower than anticipated due to the use of a large-runner aftermarket intake manifold.

POWER VOLUMETRIC EFFICIENCY
RPM WHP %
2500 49.66 80.5
3000 82.45 88.2
3500 112.31 98.6
4000 166.27 85.9
4500 281.42 85.0
5000 323.28 89.1
5500 371.95 92.1
6000 399.03 88.7
6500 415.72 88.8
7000 451.50 84.9
7500 N/A N/A
8000 N/A N/A
8500 N/A N/A
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