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″) |
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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
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 |
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| 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 |
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| 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 | |