Quote:
Originally Posted by serge944
I think a lot of your are overlooking a huge factor.
When your air filter is clogged to the point of causing additional restriction throughout the rpm range, you are operating at lower volumetric efficiency. Meaning, you are making less power at each point throughout the rpm range.
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No,. That is not true unless the filter is so clogged almost no air at all can get through, or unless you drive full throttle all the time. Oh, never mind, I see you have a 944
Just kidding.
At partial throttle the restriction in the air filter is not a factor unless it is nearly epoxied and fiberglassed over. I don't think it's possible to get a filter that dirty.
The restriction is the throttle plate, not the filter.
The only time it will effect VE is if it is wide open throttle, higher rpm, and the filter becomes the dominating bottleneck.
Most filters are designed to flow much more air than an engine needs even if it's dirty so you really, really have to munge it up to make it the dominating restriction.