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Dyno Cams P-Open Camshaft GX390 and 13/15hp Chinese OHV

Dyno Cams P-Open Camshaft GX390 and 13/15hp Chinese OHV

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Product Code: DYNOPOPEN-390
The P-Open is intended for a full tilt modified or open class. This cam offers larger duration with a lower lift. Upgraded valve springs, billet rod, and billet flywheel are mandatory. A 33mm or larger carb is recommended. The lobes are welded to increase durability, extending the life of this cam.
Dual springs required.
The lobes are welded to increase durability, extending the life of this cam.
Specs
  • Engine: 390cc Honda GX390, 420cc Predators, & 13/15 hp Chinese OHV
  • Recommended Class: Modified / Open
  • Target (MAX) RPM: 8000+
  • Spring Pressure (In / Ex): 65 lbs Dual Spring
  • Valve Lash (In/Ex):.003"
  • Ignition Timing:110 Octane 34 Deg BTDC, Methanol 38 Deg BTDC
  • Compression Ratio:12.5 to 1 or Higher
INTAKE EXHAUST
OPEN: 71 BTDC 89 BBDC

CLOSE: 88 ABDC 50ATDC

LIFT: .363" .367"

C/L: 106.0 ATDC 110 BTDC

DUR@50 263 DEG 269 DEG


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