Holdener did a low v. high compression test (which is interesting) but he said something that defies what I was taught.
the quote starts about 5:30
he said that hydraulic lifters create more lift then solid rollers due to lash. I thought that one of the big downsides to hydraulic lifters was that the plunger would compress a bit under load thus reducing the true lift at the valves. With hydraulic, you pre-load the lifter (which creates its own problem at high rpms in losing valve control), thus his statement simply doesn't seem to jive with what I already think I know.... (and it's also why I rarely watch him, most times I catch myself throwing popcorn at the screen because he says dumb things (e.g. the Cadillac builds)
I also think that by not making the cam/lifters the same in both tests that this is information but not the best information....
What say you?
the quote starts about 5:30
he said that hydraulic lifters create more lift then solid rollers due to lash. I thought that one of the big downsides to hydraulic lifters was that the plunger would compress a bit under load thus reducing the true lift at the valves. With hydraulic, you pre-load the lifter (which creates its own problem at high rpms in losing valve control), thus his statement simply doesn't seem to jive with what I already think I know.... (and it's also why I rarely watch him, most times I catch myself throwing popcorn at the screen because he says dumb things (e.g. the Cadillac builds)
I also think that by not making the cam/lifters the same in both tests that this is information but not the best information....
What say you?
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