DSPORT Magazine technical showcase editorial on EVO 4G63 camshaft options

MANUFACTURER: Kelford Cams
ENGINE MODEL: 4G63 EVO 8
CAMSHAFT PN#: 8-TX272
SPEC CARD#: 133942

INTAKE EXHAUST
CAM TIMING EVENTS
Centerline 107° 113°
Valve Opening @ 1.0mm 1.8° BTDC 47.6° BBDC
Valve Opening @ 0.050″ 1.7° ATDC 43.9° BBDC
Valve Closing @ 1.0mm 41.4° ABDC 4.4° BTDC
Valve Closing @ 0.050″ 37.6° ABDC 7.9° BTDC
DURATION
Actual Duration @ 1.0mm 222.9° 223.2°
Actual Duration @ 0.050″ 215.8° 216.0°
Claimed Duration @ 1.0mm 226.0° 226.0°
PEAK LIFT
Peak Valve Lift 11.1mm (0.436″) 11.1mm (0.436″)
Peak Cam Lift 6.4mm (0.252″) 6.4mm (0.252″)

Manufacturer’s Pitch

272 Duration 11.00mm Lift. The best all round performance cam to suit 400-600hp racing engines running up to 35psi of boost. Recommended redline of 8,500 RPM with KVS63-BTK springs.

INFO

If you are running an engine management solution that allows for fine tuning of the engine at idle, the Kelford 272s will definitely deliver more power than the 264s, at the expense of a slightly lopey idle. Compared to the stock cams, the Kelford 272s raised peak power output by nearly 25 percent. On our test engine, we picked up almost 110 more horsepower at the wheels from the upgrade to the Kelford 272s. These cams faired better than the 264s below 4,500 RPM on our test engine equipped with the large-runner intake manifold. Normally, the 264s would outperform the 272s up to the 4,500 RPM range.


RUNDOWN

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

560.6 WHP @ 8,300 RPM
411.3 LB-FT @ 6,000 RPM

Peak power checked in at 8,300 RPM while the power curve stays virtually flat from 7,800 RPM until 8,500 RPM. Peak boost was reached at about 4,600 RPM. A flat torque band from 5,000 to 7,800 RPM delivers over 375 lb-ft of torque. Peak torque came in at 6,000 RPM. Highest VE values were recorded at 8,000 RPM. VE figures superior to the stock camshafts at all engine speeds from 3,500 RPM and beyond.

HORSEPOWER

RPM/WHP FACTORY KELFORD 272 GAIN/(LOSS)
2500 49.66 50.47 0.81
3000 82.45 64.62 (17.83)
3500 112.31 96.75 (15.56)
4000 166.27 142.72 (23.55)
4500 281.42 291.52 10.10
5000 323.28 355.84 32.56
5500 371.95 418.82 46.87
6000 399.03 459.58 60.55
6500 415.72 492.16 76.44
7000 451.50 527.37 75.87
7500 N/A 545.08 N/A
8000 N/A 553.33 N/A
8500 N/A 553.83 N/A

VOLUMETRIC EFFICIENCY

RPM/% FACTORY VE KELFORD 272
2500 80.5 89.3
3000 88.2 95.3
3500 98.6 96.4
4000 85.9 97.0
4500 85.0 97.1
5000 89.1 96.8
5500 92.1 97.8
6000 88.7 99.0
6500 88.8 100.0
7000 84.9 96.6
7500 N/A 92.2
8000 N/A 89.8
8500 N/A 83.9
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