REFLECTOR: XLFG Intake Air

[Andrew Judge]

I have my oil checked every time – will probably stop doing it soon because my compressions are always 78/80. I have about 600 hours. Everything is always “normal” – including Silicon. I fly in FL for what it’s worth and typically above 5k.





Andrew Judge

President

Grove Networks Inc.


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From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Scott Derrick
Sent: Thursday, March 21, 2013 10:04 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: XLFG Intake Air

I ran my IO360 for 500 hours non-filtered.

The cylinder walls and tops of pistons had considerable wear when inspected.

I had the oil checked a few times and always was over the  limit for silicon, a sure sign of using non-filtered air. Silicon doesn't come from rocks thrown up by the nose wheel, it from airborne particles.  I've taxied many times during a windy day and could see the dust and stuff in the air.

I think the non-filter crowd is head in the sand when it comes to the downside of running sans filter.

Scott
-------- Original Message --------
Subject: REFLECTOR: XLFG Intake Air
From: Mark Magee <edjonesbrady at gmail.com><mailto:edjonesbrady at gmail.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org><mailto:reflector at tvbf.org>
Date: 03/20/2013 09:12 PM
All,
My XLFG was built with a NACA scoop where the bottom engine cowl marries to the fuselage for ram intake air. As I am nearing painting, and did not build this into the bird, the PO did, I'm considering eliminating the filtered lower NACA ram-air configuration for scat tubing to a cooling air NACA scoop topside for simplicity. As well the NACA down low where it is does catch considerable FOD from the nosewheel, yet is filtered.
I know some folks are running straight unfiltered from a scat tubing routing from an upper engine cooling NACA with no alternate air. Any feedback from the group on how well this is working? If I were to make this change I fear I might lose a slight loss of manifold pressure, but for the simplicity would be better off overall. The sealing on the airbox to the lower cowl is problematic.
Thanks in advance for the feedback.
Mark Magee N34XL XLFG

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