Lifter Technology Selection
how do you make the call for the more expensive, harder to execute roller hardware?
Mostly depends on how hot of an engine you want to build. Figure it like this by making use of the KISS method.
HFT, Use for an every day grocery getter with high mileage to moderate race track useage.
These cams mostly come with what most would consider lame (Chevy) lobes for performance. But you can get good results with them if your not expecting the world from them.
HR Same as above but with increased intensity with the right manufacturer or lobe. But still the same idea. The roller decreases friction and helps with the ability to increase the cam lobes intensity for lifting the valve quicker.
SFT; You can get these from a high mileage cam to a full tilt *** kickin grind. The main idea of a solid lifter is a direct connection that enables more RPM’s. Greater lift and more power through out the curve.
Solid Roller; No one really makes a mild SR cam. This style was brought out for racing and hauling back broken parts of those you defeated on your brutal rampage.
Now which one fits your intended build and wallet?
So awhy would you go with a roller over a flat tappet? Reduced friction so more HP? Do hydraulic roller do better at higher rpm than hydraulic flat tappet? Seems solid roller would be the ultimate but it doesn't seem like many folks use them on street engines, or at least to the extent that solid flat tappets are used.
Answering in order asked;
Because Conan the Barbarian said it best!
Something like, Watching the defeated heads roll, the Lamenting of their women ETC...
Yes and yes
Barely if at all to just slightly on a good cam ft and spring combo.
And the note between a regular SFT and a solid roller is, yes of course, the “cost!” Is the draw back.
Look up Cranes Ductile rocker arms cost gs inexpensive (but yet quality) roller rockers.
Then the tappets and the cam itself.
These are the 3 main items that are different in cost by a large enough margin to really make a difference.
Springs, locks and retainers are all close if not the same part number.
