Lifter differences on the dyno
Thread Starter
Joined: Jun 2005
Posts: 2,265
Likes: 671
From: Oskaloosa, Iowa
What he's telling you is that's the only way rockers make a real HP difference. Ratio. that's it.
Same for heads. He gets questions like, "what's the better head, X or Y??" He will show WHY head X with the small ports and chambers can be better than larger, better flowing ports and larger lower compression chambers.
You need to look at context.
Same for heads. He gets questions like, "what's the better head, X or Y??" He will show WHY head X with the small ports and chambers can be better than larger, better flowing ports and larger lower compression chambers.
You need to look at context.
Thread Starter
Joined: Jun 2005
Posts: 2,265
Likes: 671
From: Oskaloosa, Iowa
Nah any kind of sound scientific test would only have a single variable at a time. Nearly impossible for the average Joe without the resources, but with those resources and the clip bait thread titles I’ve seen enough to know his results are misleading to the point it seems he often has an agenda and manipulated the test to give the desired results so I no longer watch his videos.
TECH Senior Member
Joined: Jun 2016
Posts: 22,298
Likes: 3,619
From: Central Cal.
He has no agenda, as he has no corporate sponsors. Usually he just works with what he has or can get.
He has no reason to skew any tests as there's nothing in it for him to gain by it.
Some tests are combos of previous tests on different engines, but he is careful to point out differences that affect the outcome, yet emphasize what the intended focus is.
A true apples to apples test isn't always feasible under the parameters he works under.
He doesn't do clickbait, or desire results different than those that result. He has no reason for either.
He has no reason to skew any tests as there's nothing in it for him to gain by it.
Some tests are combos of previous tests on different engines, but he is careful to point out differences that affect the outcome, yet emphasize what the intended focus is.
A true apples to apples test isn't always feasible under the parameters he works under.
He doesn't do clickbait, or desire results different than those that result. He has no reason for either.
He has no agenda, as he has no corporate sponsors. Usually he just works with what he has or can get.
He has no reason to skew any tests as there's nothing in it for him to gain by it.
Some tests are combos of previous tests on different engines, but he is careful to point out differences that affect the outcome, yet emphasize what the intended focus is.
A true apples to apples test isn't always feasible under the parameters he works under.
He doesn't do clickbait, or desire results different than those that result. He has no reason for either.
He has no reason to skew any tests as there's nothing in it for him to gain by it.
Some tests are combos of previous tests on different engines, but he is careful to point out differences that affect the outcome, yet emphasize what the intended focus is.
A true apples to apples test isn't always feasible under the parameters he works under.
He doesn't do clickbait, or desire results different than those that result. He has no reason for either.
Launching!
Joined: Oct 2022
Posts: 206
Likes: 74
From: FL
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TECH Senior Member
Joined: Jun 2016
Posts: 22,298
Likes: 3,619
From: Central Cal.
Launching!
Joined: Oct 2022
Posts: 206
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From: FL
TECH Fanatic
Joined: Jul 2007
Posts: 1,802
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From: Wilmington, De
If lifters are going to cause a loss it's going to be at the low end. There's more time to bleed down when things are happening slower.
Ever think about pushrods? The dyno hero of everyone here did a test on different length pushrods and found that longer makes more power up top. It's because oil in the lifter is more likely to be aeriated at high rpm. Longer pushrod leaves less space for oil.
I had a conversation with Brian Nutter, the engineer for Summit Pro LS cams and he was telling me how dirt track racers figured this out long ago. And since they are under strict rules and engine inspections someone figured out to put spacers in the stock lifters to take up some of the volume, and it did lead to power gains in the high rpm areas.
Ever think about pushrods? The dyno hero of everyone here did a test on different length pushrods and found that longer makes more power up top. It's because oil in the lifter is more likely to be aeriated at high rpm. Longer pushrod leaves less space for oil.
I had a conversation with Brian Nutter, the engineer for Summit Pro LS cams and he was telling me how dirt track racers figured this out long ago. And since they are under strict rules and engine inspections someone figured out to put spacers in the stock lifters to take up some of the volume, and it did lead to power gains in the high rpm areas.
