DSPORT Magazine technical showcase editorial on EVO 4G63 camshaft options

MANUFACTURER: Comp Cams
ENGINE MODEL: 4G63 EVO 8
CAMSHAFT PN# (INTAKE): 119-301-8I
CAMSHAFT PN# (EXHAUST): 119-302-8E
SPEC CARD# (INTAKE): WA8489-13
SPEC CARD# (EXHAUST): UX3544-07

INTAKE EXHAUST
CAM TIMING EVENTS
Centerline 104° 112°
Valve Opening @ 1.0mm 0.8° ATDC 46.4° BBDC
Valve Opening @ 0.050″ 2.6° ATDC 43.0° BBDC
Valve Closing @ 1.0mm 46.4° ABDC 5.7° BTDC
Valve Closing @ 0.050″ 43.0° ABDC 9.2° BTDC
DURATION
Actual Duration @ 1.0mm 221.0° 220.6°
Actual Duration @ 0.050″ 214.2° 213.8°
Claimed Duration @ 1.0mm 218.0° 218.0°
PEAK LIFT
Peak Valve Lift 11.2mm (0.442″) 10.5mm (0.414″)
Peak Cam Lift 6.5mm (0.255″) 6.1mm (0.239″)

Manufacturer’s Pitch

280+, Excellent for big turbos with high boost levels and using ported heads. Designed to deliver maximum power in higher RPM range.

INFO

The biggest and baddest offering from Comp Cams, the 280+, offers 100 additional horsepower over the factory camshafts. Peak power rose to 559.09 whp at 7,900 RPM. The Comp 280+ camshaft set delivers a strong powerband above 4,500 RPM at the expense of a lopey idle. Valve spring upgrades are required with these camshafts. Not only did the Comp 280s perform exceptionally on the top end, they also made more power than any other grind at 2,500 and 4,500 RPM.


RUNDOWN

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

559.08 WHP @ 7,900 RPM
408.65 LB-FT @ 6,200 RPM

Peak power checked in at 7,900 RPM, as the power curve remained virtually flat from 7,900 to 8,500 RPM. Peak boost was reached at just under 5,000 RPM. The torque curve stayed steady from 5,300 to 7,000 RPM. Maximum torque registering just over 400 lb-ft was reached at 6,200 RPM. The highest VE values were recorded at 6,500 RPM. Compared to the factory bumpsticks, the Comp 280+ camshaft set delivered superior VE numbers from 4,000 RPM and beyond.

HORSEPOWER

RPM/WHP FACTORY COMP 280+ GAIN/(LOSS)
2500 49.66 54.27 4.61
3000 82.45 65.22 (17.23)
3500 112.31 101.31 (11.00)
4000 166.27 149.86 (16.41)
4500 281.42 295.44 14.02
5000 323.28 352.95 29.67
5500 371.95 414.95 43.00
6000 399.03 463.17 64.14
6500 415.72 494.20 78.48
7000 451.50 525.10 73.60
7500 N/A 536.59 N/A
8000 N/A 544.80 N/A
8500 N/A 540.37 N/A

VOLUMETRIC EFFICIENCY

RPM/% FACTORY VE COMP 264+
2500 80.5 89.3
3000 88.2 95.3
3500 98.6 96.4
4000 85.9 97.0
4500 85.0 97.0
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 92.0
8000 N/A 90.0
8500 N/A 83.9
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