Difference between Hydraulic Roller and Hydraulic cam?
12-23-2002, 09:32 PM
#2
Re: Difference between Hydraulic Roller and Hydraulic cam? (james holley)
The same basic difference between a roller and a flat tappet cam.
A flat tappet cam was the first design really, just a solid lifter riding a solid camshaft. Then somebody came up with hydraulic, it allows some movement in the lifter and as such you don't have to adjust the valves every so many miles.
Somebody came up with the idea for a roller cam, by putting a rolling lifter on the camshaft you can have steeper ramps and less friction. You can make more power while remaining driveable. But such as it is you still have to adjust the valves every so often. A hydraulic roller combines the two. It gives up a little bit of power potential but makes for a very good compromise between power and driveability / durability
:cheers:
The hydraulic roller will have less frictional losses and can have more lift for a given duration, allowing more power to be made for that duration. If you get too much lift on a flat tappet cam then the lifter will dig into the side of the cam rather than slide along it's surface, obviously that won't work.
[Modified by Nathan Plemons, 8:41 PM 12/23/2002]
A flat tappet cam was the first design really, just a solid lifter riding a solid camshaft. Then somebody came up with hydraulic, it allows some movement in the lifter and as such you don't have to adjust the valves every so many miles.
Somebody came up with the idea for a roller cam, by putting a rolling lifter on the camshaft you can have steeper ramps and less friction. You can make more power while remaining driveable. But such as it is you still have to adjust the valves every so often. A hydraulic roller combines the two. It gives up a little bit of power potential but makes for a very good compromise between power and driveability / durability
:cheers:
The hydraulic roller will have less frictional losses and can have more lift for a given duration, allowing more power to be made for that duration. If you get too much lift on a flat tappet cam then the lifter will dig into the side of the cam rather than slide along it's surface, obviously that won't work.
[Modified by Nathan Plemons, 8:41 PM 12/23/2002]
