2011 - Crane Cams

Lifters - Mechanical Roller
Mechanical Roller Lifters (continued)
We do not advise the use of offset pushrod seat roller lifters, when the pushrod
angle imparts rotational forces upon the lifter. Offset roller lifters are acceptable for
use when the pushrods are angled to the front or rear of the engine (parallel to the
camshaft). If the pushrods lean toward the left or right of the lifter bores (as viewed
from the front or rear of the engine), this will put severe loads on the lifter guidebar
and it’s attaching mechanism, which can lead to decreased reliability and possible failure.
When building a serious racing engine, it’s advisable to avoid using offset lifters
whenever possible. Offset lifters can also be responsible for accelerated wear to the
lifter bores, lifter bodies, roller wheel/bearings/axles, and cam lobes. Plan ahead when
choosing and preparing your cylinder block and heads, so you can use centered lifters
for best reliability.
Choose The Right Crane Roller Lifters for Your Application
Crane Classic Design or Ultra-Pro Roller Lifters?
With the release of Crane Cams new Ultra-Pro series of roller lifters, you might be
wondering just which series of lifters is right for your application. Listed below are
some guidelines for making the correct choice and getting “the best performance for
your dollar”.
Crane Classic Design Crane roller lifters were developed when camshaft lobes were not
nearly as violent as today. They are ideal for street-rollers, many bracket-race type
applications and other racing uses where cam profiles aren’t as aggressive. Made of
carburized (heat treated) 8620 alloy steel, these rollers are capable of handling up to
240 lbs., of valve spring seat pressure in bracket race applications and up to 220
lbs., of seat pressure in endurance applications – providing the cam lobe profile is not
extremely violent. Open pressures exceeding 600 lbs., are not recommended for these
lifters. Crane Classic Design lifters feature high quality wheels and axles that “look alike”
lifters do not have. You’ll find that the materials, machining tolerances and overall quality
of Crane Classic Design roller lifters far exceeds lifters being sold for a lower price.
These roller lifters feature all the quality and durability you expect from a Crane Cams
product yet they are very economically priced.
Crane Ultra-Pro roller lifters are the ultimate in state-of-the-art, drop-in design
premium quality roller lifters! Empirical design and development techniques have
been used to eliminate any distortion effects of residual stresses resulting from the
heat treat process. Ultra-Pro roller lifters feature maximized strength; especially in
the axle support struts. This insures geometrically perfect tracking of the roller wheel.
Additionally, super-premium wheels, axles and bearings made from the finest grades of
alloy steels are used to conquer even the most violent cam lobe profiles currently
designed or anticipated for the next several years! These lifters represent the best
combination of lightweight, ultimate strength and reliability. They should be used
in all drag race applications with spring seat pressures in excess of 300 lbs., and open
pressures over 800 lbs. In addition, they should be used in any short-track circle or
endurance racing application where valve spring seat pressures exceed 250 lbs., and
open pressures exceed 700 lbs. Use Crane Cams Ultra-Pro series lifters when
absolute durability is necessary.
Vertical Guide Bar — Crane Classic Design
With Crane Cams Ultra-Pro roller lifters, engine builders can now be sure that they’re
using the absolute finest available, professional quality roller lifters for high-stress race engine applications. Count on
Crane Cams to give you a full selection of performance products with the best performance for the buck and peace of
mind for you.
866-388-5120 • 386-236-9983 FAX 297