Talk:Air flow bench

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Aviation: Engines Start‑class

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U-Tune? manometer

It's not U-tune manometer, it's U-tube as in using a column of liquid to measure pressure. — Preceding unsigned comment added by 167.6.247.197 (talk) 21:25, 7 October 2011 (UTC)[reply]

Discussing on 2-valve vs 4-valve doesn't belong here.

There was a section all about 2-valve vs 4-valve engines and why 4-valves are better on the bottom of the page. The whole thing seemed to be written by someone who didn't know what they were talking about. I tried to improve it, but just after I saved it, I realized that it's completely irrelevant to air flow benches, other than perhaps that benches were used to verify the findings, and it doesn't say anything about that. Aside from getting the main reasons 4-valves are better than two wrong, they also claimed that "cars with forced induction have camshafts with overlap". Sure, they do. But virtually ALL engines have some overlap between the exhaust and intake openings on the camshaft. The difference is the AMOUNT of overlap, and high overlap is important in high-performance naturally aspirated cars as well. In fact, it's the main reason that "lumpy cams" give such shitty vacuum, because the intake is trying to draw air in while the exhaust port is still open. This makes it run like shit at low speeds, but once you get RPM's up, the resonance in the exhaust and intake work to pump the air in and gasses out, like a "natural turbo". I'd also add to that that a lot of experts claim that the best cam for a turbo engine is the same as for a moderately cammed NA engine. Leave the high overlaps to the lumpy, 2-valve NA race engines, who need that extra help filling the cylinders a lot more than a forced induction engine does. But it doesn't matter, since it doesn't have any relevance to this subject..45Colt 08:45, 19 August 2015 (UTC)[reply]

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