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Prof.Blair seemed to think it was only dependent on ambient air temperature and rpm.That's pretty much what Johnm is using,with excellent results.There are short or long alternative lengths that have more or less effect,but they still resonate.They say not to exceed 1/4 radius at the bell mouth entry for best results.At 25 degrees C,a 15" intake will work at 4,677 rpm,5,994 rpm and 8,082 rpm.I've sometimes used 14" to 16" intake length.You might have seen this before,but here's a demo with some dyno results http://www.emeraldm3d.com/articles/emr-adj-length-intake/ The effects are very noticable.
Prof.Blair seemed to think it was only dependent on ambient air temperature and rpm.That's pretty much what Johnm is using,with excellent results.
There are short or long alternative lengths that have more or less effect,but they still resonate.They say not to exceed 1/4 radius at the bell mouth entry for best results.
At 25 degrees C,a 15" intake will work at 4,677 rpm,5,994 rpm and 8,082 rpm.
I've sometimes used 14" to 16" intake length.
You might have seen this before,but here's a demo with some dyno results http://www.emeraldm3d.com/articles/emr-adj-length-intake/ The effects are very noticable.
