DSPORT Magazine technical showcase editorial on EVO 4G63 camshaft options

MANUFACTURER: Kelford Cams
ENGINE MODEL: 4G63 EVO 8
CAMSHAFT PN#: 8-TX280
SPEC CARD#: 133933

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

280/276 Duration, 11.50/11.00mm Lift. High HP racing cams, suits well built racing engines up to 35psi boost and 9,000 RPM with our recommended valve spring.

INFO

Planning to run up to 9,000 RPM? The Kelford 280s were designed to optimize performance from 6,000 to 9,000 RPM. While these “bigger” camshafts trade off some low-end and mid-range performance to the smaller 272 and 264 offerings, they maximize performance from 6,000 RPM and beyond. Simply swapping from OEM to Kelford 280s increased the engine’s peak power output by nearly 30 percent. That’s an additional 125 horsepower at the wheels without any increase in boost pressure. Of course, the more radical nature of the cams will deliver a more race-like idle.


RUNDOWN

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

583.3 WHP @ 8,400 RPM
410.0 LB-FT @ 6,800 RPM

Peak power checked in at 8,400 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 5,800 to 7,800 RPM delivered over 400 lb-ft of torque. Peak torque came in at 6,800 RPM. Highest VE values were recorded at 8,000 RPM. VE figures superior to the stock camshafts at all engine speeds from 4,000 RPM and beyond.

HORSEPOWER

RPM/WHP FACTORY KELFORD 280 GAIN/(LOSS)
2500 49.66 45.34 (4.32)
3000 82.45 61.25 (21.20)
3500 112.31 85.92 (26.39)
4000 166.27 127.43 (38.84)
4500 281.42 251.62 (29.80)
5000 323.28 342.6 19.32
5500 371.95 406.3 34.35
6000 399.03 456.32 57.29
6500 415.72 493.58 77.86
7000 451.50 541.35 89.85
7500 N/A 564.27 N/A
8000 N/A 572.2 N/A
8500 N/A 576.2 N/A

VOLUMETRIC EFFICIENCY

RPM/% FACTORY VE KELFORD 280
2500 80.5 89.0
3000 88.2 95.2
3500 98.6 96.6
4000 85.9 96.8
4500 85.0 97.3
5000 89.1 96.8
5500 92.1 97.7
6000 88.7 99.0
6500 88.8 100.0
7000 84.9 97.0
7500 N/A 92.1
8000 N/A 90.0
8500 N/A 84.2
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