2011 - Crane Cams

VALVE TRAIN
Lifters - Hydraulic and Mechanical
“Anti-Pump Up” Performance Hydraulic Lifters
Hydraulic lifters compensate for changes occurring within the valve train. Crane Cams’
precision made “Anti-Pump Up” lifters allow the engine to reach its maximum RPM
potential (with the correct cam and components). The “bleed rate” of this lifter is maintained
by micro tolerances that prevent pump-up and limiting of full RPM potential.
After proper preload has been set, hydraulic lifters seldom need maintenance.
Maximum RPM Potential: 6,500 to 7,000 RPM.
Hi Intensity Hydraulic Lifters
Crane Hi Intensity lifters produce a “variable duration effect.” At lower RPM this can
reduce running duration by 6° to 10° and decrease valve lift by .020” to .030”. Hi
Intensity lifters work best with a cam that requires more compression ratio than the
engine actually has. Hi Intensity lifters restore vacuum, cylinder pressure and bottom
end performance. As RPM increases, these lifters act more like a normal hydraulic lifter.
At 2500 to 3000 RPM they will transmit the full duration and lift of the cam.
Use only if the engine’s compression ratio is below the minimum recommended on
the application page for the cam you have chosen. Hi Intensity lifters can cause “low
speed detonation” if compression is too high. Slightly more noisy than standard lifters
(NOT as noisy as a mechanical cam) and can trigger knock sensors.
Maximum RPM Potential: 6,500 to 7,000 RPM.
Mechanical (“Solid”) Lifters
Mechanical “solid” lifters should be used in applications when hydraulic cams would
surpass their maximum RPM potential. Mechanical lifters have no hydraulic mechanism
to pump-up. Theoretically, with the correct cam and engine components, a
mechanical lifter cam has an RPM potential of 8000 to 8500 RPM
Mechanical lifters are noisier than hydraulics. The engine must have an adjustable
valve train system. Valve lash must be set, periodically checked, and maintained. (Can
NOT be used on a hydraulic design cam.)
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CRANECAMS.COM
Crane Cams performance hydraulic lifters offer precise
oil metering and control. Our exclusive internal
valving prevents hydraulic lifter “pump-up” with
performance camshaft profiles, even at high RPM.
Crane Hi Intensity lifters produce maximum performance
with minimal noise. They offer increased vacuum,
torque and overall power with near stock valve
train noise.
Crane mechanical lifters are precision machined
from finest quality alloyed materials to be metallurgically
compatible with cam lobes.