MANUFACTURER: JUN
ENGINE MODEL: 4G63 EVO 8
CAMSHAFT PN# (INTAKE): 1004M-M012
CAMSHAFT PN# (EXHAUST): 1004M-M142
SPEC CARD# : N/A
INTAKE | EXHAUST | |
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CAM TIMING EVENTS | ||
Centerline | 110° | 110° |
Valve Opening @ 1.0mm | 7.3° ATDC | 38.9° BBDC |
Valve Opening @ 0.050″ | 10.6° ATDC | 35.6° BBDC |
Valve Closing @ 1.0mm | 39.4° ABDC | 7.3° BTDC |
Valve Closing @ 0.050″ | 35.8° ABDC | 10.9° BTDC |
DURATION | ||
Actual Duration @ 1.0mm | 212.1° | 211.6° |
Actual Duration @ 0.050″ | 205.1° | 204.7° |
Claimed Duration @ 1.0mm | 214.0° | 214.0° |
PEAK LIFT | ||
Peak Valve Lift | 10.8mm (0.425″) | 10.2mm (0.401″) |
Peak Cam Lift | 6.2mm (0.245″) | 5.9mm (0.232″) |
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INFO
Ahtough we could only get our hands on one of the JUN camshaft offerings for the 4G63 EVO 8, this camshaft set proved to deliver loads of power paired with the requisite lumpy idle. This pair of camshafts provided some of the highest VE numbers across our camshaft test group. Unlike most of the camshafts, the JUN 272s only began to deliver an increase in power production from 5,000 RPM up to 8,500 RPM. Our dyno runs recorded over 550 wheel horsepower from the JUN 272-equipped 4G63, a 23.5 percent increase in power over factory.
RUNDOWN
557.56 WHP @ 8,500 RPM
404.96 LB-FT @ 6,200 RPM
Peak power checked in at 8,500 RPM, as the power curve flattened out from 7,000 to 8,500 RPM. Peak boost was reached at 4,600 RPM. The torque curve remained flat from 5,500 to 7,500 RPM and tapers off higher slightly in the power band. Maximum torque of nearly 405 lb-ft was reached at 6,000 RPM. VE values of 99.0 or higher were recorded from 5,000 to 7,000 RPM. Superior VE figures superior to the factory camshafts were recorded from 4,000 to 8,500 RPM.
HORSEPOWER |
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RPM/WHP | FACTORY | JUN 272 | GAIN/(LOSS) |
2500 | 49.66 | 47.64 | (2.02) |
3000 | 82.45 | 62.22 | (20.23) |
3500 | 112.31 | 91.03 | (21.28) |
4000 | 166.27 | 128.85 | (37.42) |
4500 | 281.42 | 255.26 | (26.16) |
5000 | 323.28 | 351.58 | 28.30 |
5500 | 371.95 | 414.73 | 42.78 |
6000 | 399.03 | 457.29 | 58.26 |
6500 | 415.72 | 481.20 | 65.48 |
7000 | 451.50 | 513.16 | 61.66 |
7500 | N/A | 539.58 | N/A |
8000 | N/A | 546.77 | N/A |
8500 | N/A | 557.56 | N/A |
VOLUMETRIC EFFICIENCY |
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RPM/% | FACTORY VE | JUN 272 | |
2500 | 80.5 | 88.7 | |
3000 | 88.2 | 92.9 | |
3500 | 98.6 | 96.7 | |
4000 | 85.9 | 96.6 | |
4500 | 85.0 | 98.5 | |
5000 | 89.1 | 100.0 | |
5500 | 92.1 | 99.0 | |
6000 | 88.7 | 101.5 | |
6500 | 88.8 | 101.0 | |
7000 | 84.9 | 99.0 | |
7500 | N/A | 93.2 | |
8000 | N/A | 88.9 | |
8500 | N/A | 82.3 |