----- Original Message -----

From: Russell Duffy

To: Rotary motors in aircraft

Sent: Thursday, May 12, 2005 7:52 AM

Subject: [FlyRotary] Re: silly intake idea of the day

 I believe you would do much better by placing a square pleated filter at an angle in a only slightly longer "shoebox". The individual cleaners work ok but will cause no end of low-end tuning headaches. Much better to use the airhorns however short. See equally terrible paint example! You can match the height of the box to a filter from the parts store.

Bill Jepson 

 

Thanks Bill,

 

So I guess the individual filters probably aren't the best idea :-)  

 

As for the height of air horns,  how much does it matter?  The TWM site lists a dimension guide: http://www.twminduction.com/AirHorn/AirHornDimensionGuide.html   This shows two different "types" of air horns, full radius, and shorty. 

 

They also show a graph of short vs tall air horns:  http://www.twminduction.com/AirHorn/short_tall.html   This seems to give the impression that short is better.  The question is what their definition of short and tall is.  If short means the shorty type, then the intake just saved some space.  

 

FWIW, I have the shorty type on my TWM TB now, and they really did make a difference when compared to not having any air horn. 

 

Thanks,

Rusty (still trying to resist messing with it, but resistance is futile)

 

 

 

Hi, Rusty....curious about the bell mouths/air horns you used. You mentioned that it "really did make a difference when compared to not having any air horn"  Any guestimate regarding rpm or power increase obtained from the air horns? (WAG is fine).  Paul Conner, thinking about another intake manifold just to keep up with Rusty

 

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