[Mr.Fixit]

The frictional losses at the lifter / cam interface are tiny, in the overall scheme of things.

"They must still save a lot of weight." (sizzler)

Where do you geys get the idea that their lifters are really light? Even they don't claim that. They have one type of "ultralight lifter" that is all composite, but only one testimonial. Most of the flat tappet info is about their steel jacketed composite tipped lifters, and they don't claim that product is much lighter.

"I imagine they could be used on the same ramps/cam as a hydraulic roller lifter, but be able to stay with/on the cam, due to their lighter weight, to a far higher rpm. This is what I'd be interested in." (sizzler)

What makes you think that? They make no such claim. If the lifter has a flat base, the cam's ramp angle can only get so aggressive before it stops riding the base of the lifter, and rides the corner. Roller cams get their rapid opening rates because they have a rounded lifter bottom. You can use mushroom or radius lifters to push that a bit, but they have their own drawbacks.


their big advantage is zero break in, that's really it. Since you guys don't turn your motors to 8000 rpm, weight isn't really an issue for your valvetrain yet anyway.