DSPORT Magazine technical showcase editorial on EVO 4G63 camshaft options

MANUFACTURER: Kelford Cams
ENGINE MODEL: 4G63 EVO 8
CAMSHAFT PN#: 8-TX264
SPEC CARD#: 133984

INTAKE EXHAUST
CAM TIMING EVENTS
Centerline 104° 112°
Valve Opening @ 1.0mm 1.8° ATDC 42.0° BBDC
Valve Opening @ 0.050″ 5.1° ATDC 38.7° BBDC
Valve Closing @ 1.0mm 34.6° ABDC 9.9° BTDC
Valve Closing @ 0.050″ 31.1° ABDC 13.3° BTDC
DURATION
Actual Duration @ 1.0mm 212.8° 212.1°
Actual Duration @ 0.050″ 206.0° 205.3°
Claimed Duration @ 1.0mm 210.0° 210.0°
PEAK LIFT
Peak Valve Lift 11.2mm (0.441″) 10.5mm (0.413″)
Peak Cam Lift 6.5mm (0.255″) 6.1mm (0.239″)

Manufacturer’s Pitch

264/260 Duration, 11.00/10.35mm Lift. The ultimate cam for street, strip and track engines from 300-500hp. These camshafts are stable to 35psi of boost and 8,000 RPM with our recommended valve spring.

showcase-4g63-evo-cams-04-kelford-264-0001

INFO

Stepping up to a Kelford 264 camshaft set showcases the performance left on the table by the factory bumpsticks. While idle quality will barely be affected, these camshafts allow for an extended powerband that produces usuable power to 8,500 RPM. In addition, peak power will increase nearly 20 percent. On our test engine, we picked up nearly 85 more horsepower at the wheels from the upgrade to the Kelford 264s. Of course, valvespring upgrades are a must when planning to exceed the factory redline. These camshafts are best suited to a factory intake manifold. The addition of a large-runner manifold, like the AMS, will not allow for optimized performance in the 3,000-to-4,500 RPM range.


RUNDOWN

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

536.4 WHP @ 7,600 RPM
397.3 LB-FT @ 6,000 RPM

Peak power checked in at 7,600 RPM with a flattening of power as engine RPM moved past this point. Peak boost was reached at about 4,500 RPM. A flat torque band from 4,600 to 7,800 RPM delivered over 350 lb-ft of torque. Peak torque came in at 6,000 RPM. Highest VE values were recorded at 6,500 RPM. VE figures superior to the stock camshafts at all engine speeds from 4,000 RPM and beyond.

HORSEPOWER

RPM/WHP FACTORY KELFORD 264 GAIN/(LOSS)
2500 49.66 48.45 (1.21)
3000 82.45 60.49 (21.96)
3500 112.31 92.27 (20.04)
4000 166.27 133.86 (32.41)
4500 281.42 278.81 (2.61)
5000 323.28 340.81 17.53
5500 371.95 396.60 24.65
6000 399.03 448.64 49.61
6500 415.72 486.33 70.61
7000 451.50 504.49 52.99
7500 N/A 527.53 N/A
8000 N/A 511.61 N/A
8500 N/A 507.46 N/A

VOLUMETRIC EFFICIENCY

RPM/% FACTORY VE KELFORD 264
2500 80.5 89.2
3000 88.2 92.9
3500 98.6 96.6
4000 85.9 96.9
4500 85.0 98.3
5000 89.1 97.9
5500 92.1 98.7
6000 88.7 101.5
6500 88.8 101.1
7000 84.9 99.0
7500 N/A 93.1
8000 N/A 88.5
8500 N/A 82.3
Share.

Comments are closed.