From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: where's the speed?
To: lml
Date: Wed, 21 Jul 2004 14:11:56 -0400
Message-ID: <web-329210@logan.com>
In-Reply-To: <693643DCBA71E34697A495AFB8C57361EB73D9@bne523deb.exchange.server-login.com>
References: <693643DCBA71E34697A495AFB8C57361EB73D9@bne523deb.exchange.server-login.com>
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Posted for "Berni Breen" <bbreen@fortherecord.com>:

  I recently purchased (from Lancair) and installed the IO550 Air
  Induction kit on my normally aspirated Lancair IV.  Upon testing after
  installation, I was quite surprised to see only a very modest
  improvement in manifold pressure when opening the air induction, no
  matter what altitude I tried.  I had previously flown in a Legacy with
  the same engine (IO550G) and saw considerably more performance
  improvement.  In the Legacy, flying at 210 kts IAS, I saw a 2.0" MP
  increase at 7,500' or above.  In my IV I see only a .6" (or less)
  increase regardless of altitude.  Additionally, at altitude, I saw a 10
  knot increase in speed in the Legacy and nearly zero in my IV.
  
  Am I the victim of unrealistic expectations or am I missing something?
  If so, why the difference in the Legacy and the IV?  I would appreciate
  any and all suggestions.
  
  Berni P Breen