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Old 05-12-2009, 12:41 PM
American Muscle's Avatar
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roller motor?

What is a roller motor and whats so special about them. Couple of buddies of mine are claiming to have roller 350 motors. Is there an advantage of roller motors than any other motor

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Old 05-12-2009, 12:55 PM
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It refers to the camshaft,which would be a roller cam,instead of flat tappets,and uses either hydraulic or solid roller lifters.There is less friction,and roller cams can have steeper lobes and can keep the valves open longer.Heres some info from Comp Cams;
I currently run a solid flat tappet cam. Is it worth the investment to upgrade to a solid roller cam?

The simple answer to this question is yes -if its in your budget. Solid roller designs use the latest and most advanced profiles that we offer. Among the benefits are reduced valve train friction, higher engine rpm capability, and use of faster ramp profiles, which generate higher power and torque by snapping the valve open and closed more quickly.

Solid roller camshafts and related component technology has come a long way in the last 10 years. Today, a solid roller setup can be durable and offer incredible performance. COMP Cams offers a high quality, Endure-X lifter which features a tool steel axle, EDM Oil Injection and precision sorted needle bearings. Endure-X lifters are available for a variety of engines with different offsets and lifter body heights.

Heres more info from Isky;

Most racers are aware of the advantages of Roller Lifters. For those who are not, a brief review is in order. Roller Cams & Lifters are employed today in all-out racing engines where valve lift/area requirements preclude the possibility of employing a flat tappet (solid lifter cam). Higher Lift requires higher valve spring loads (pressures) and flat tappet cams can only handle so much. Additionally, increased rates of lift (cam lobe velocity) above .007" per degree for example on an .842" diameter G.M. lifter, would cause the lobe to reach-out over the edge of the lifters' cam face. Consequently, with either too much spring or too high a lift rate, most racers know that extremely radical flat tappet cams will eventually self-destruct.

But, what about Roller Lifters? Are they as indestructible as many believe? How do we prolong the life of their roller bearings in today's modern race only engines? Roller lifters require special care and maintenance if they are to provide good service life. Here are the 4 most important factors you should consider to insure their success.

And heres some more;

http://www.myrideisme.com/Blog/camsh...pet-vs-roller/

Hope this helps.
Guy
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Old 05-12-2009, 06:06 PM
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thanks alot it really informed me.hemi joe
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Old 05-12-2009, 08:52 PM
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roller lifter engines are extremely common these days, most of even the smaller engines now are roller lifter equipped, by pretty much all the manufacturers now.
in stock form.

very any real problems with them

or at least a problem with them is never seen by us at the shop,

they hold up very well, and with high mileage.

roller lifters:


Last edited by fast68; 05-12-2009 at 08:59 PM.
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