DSPORT Magazine technical showcase editorial on EVO 4G63 camshaft options

MANUFACTURER: Buschur Racing
ENGINE MODEL: 4G63 EVO 8
CAMSHAFT PN# (INTAKE): BF272
SPEC CARD# (INTAKE): N/A

INTAKE EXHAUST
CAM TIMING EVENTS
Centerline N/A N/A
Valve Opening @ 1.0mm 0.2° ATDC 52.2° BBDC
Valve Opening @ 0.050″ 3.3° ATDC 48.5° BBDC
Valve Closing @ 1.0mm 46.3° ABDC 4.8° BTDC
Valve Closing @ 0.050″ 42.8° ABDC 8.3° BTDC
DURATION
Actual Duration @ 1.0mm 226.6° 214.5°
Actual Duration @ 0.050″ 227.5° 220.2°
Claimed Duration @ 1.0mm N/A N/A
PEAK LIFT
Peak Valve Lift 11.2mm (0.442″) 11.3mm (0.443″)
Peak Cam Lift 6.5mm (0.256″) 6.5mm (0.256″)

Manufacturer’s Pitch

The ultimate in EVO camshafts. This new custom grind from Buschur Racing has proven itself to make the most power of any camshaft we have tested to date in the EVO. We’ve had these cams custom ground and are glad we can offer them at a reasonable price to our customers. These camshafts are recommend for use with FP RED, GT30 series or larger turbo and will require our spring and retainer kit to support them.

Buschur Racing 272 camshafts vertical

INFO

Designed for use with a FP RED or GT30 size turbo or larger, the Buschur Racing BF272 camshaft set delivers power without any significant idling issues. Compared to the factory camshafts, the BF272s extracted more than 110 additional horsepower from our 4G63 engine. With the BF272s, the peak power shifts from 7,000 to 8,400 RPM. These camshafts also require the installation of aftermarket valve springs. Although the power drops noticeably from 3,000 to 4,500 RPM, this loss of power may be attributed to the large runners of the aftermarket intake manifold on our test vehicle.


RUNDOWN

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

570.19 WHP @ 8,400 RPM
410.11 LB-FT @ 6,400 RPM

Peak power checked in at 8,400 RPM, although the power curve flattened out from 7,500 RPM to 8,500 RPM. Peak boost was reached at about 4,900 RPM. A flat torque band from 5,500 RPM to 6,750 RPM peaked at just over 400 lb-ft at 6,400 RPM. The highest VE values were recorded at 6,500 RPM, reaching the 100.0 mark. From 4,000 RPM to redline, the Buschur 272 cams delivered a significant increase in VE over the factory units.

HORSEPOWER

RPM/WHP FACTORY BUSCHUR 272 GAIN/(LOSS)
2500 49.66 50.56 0.90
3000 82.45 63.80 (18.65)
3500 112.31 96.53 (15.78)
4000 166.27 136.09 (30.81)
4500 281.42 270.30 (11.12)
5000 323.28 358.84 35.56
5500 371.95 421.12 49.17
6000 399.03 461.26 62.23
6500 415.72 497.60 81.88
7000 451.50 528.18 76.68
7500 N/A 551.90 N/A
8000 N/A 562.05 N/A
8500 N/A 569.49 N/A

VOLUMETRIC EFFICIENCY

RPM/% FACTORY VE BUSCHUR 272
2500 80.5 89.2
3000 88.2 95.2
3500 98.6 96.6
4000 85.9 96.7
4500 85.0 97.3
5000 89.1 96.8
5500 92.1 97.8
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 84.1
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