Hi Graham,
Thank you for that useful bit regarding temperature. I can assure you 100%
it is melted droplets of metal, and the aluminum underneath has melted away
almost completely. Was I hit by lightning maybe ? I did get into a
thunderstorm once.
Karl
ps: if Europe 04 send me a replacement silencer I will be happy to return
mine for inspection.
>From: Graham Singleton <grahamsingleton@btinternet.com>
>Reply-To: europa-list@matronics.com
>To: europa-list@matronics.com
>Subject: Re: Europa-List: Melting silencer
>Date: Tue, 08 May 2007 01:25:26 +0100
>
><grahamsingleton@btinternet.com>
>
>Karl
>stainless steel melts around 1550 deg C so it's highly unlikely you have
>melting.
>
>Karl Heindl wrote:
>>
>>
>>
>>The mod 72 has one good side benefit, it gives us the chance for a real
>>close inspection of the back of the engine and underneath. I had to remove
>>the silencer for better access to the firewall and two bottom frame bolts.
>>Here is what I discovered :
>>The bottom of the silencer , starboard side, an oval area of 30x90mm was
>>badly pitted with strong signs of having melted. The aluminum duct
>>directly underneath is similarly affected. I tapped the affected area with
>>a hammer to look for any weakness, but it appears to be still okay. The
>>aluminum is paper thin and needs to be patched.
>>
>>My installation is a standard 912S fwf kit with stainless exhaust system
>>and Singleton firewall. I never experienced any temperatures (according to
>>the EIS) above the permissable ranges. The EGT probes are on the exhaust
>>stubs of cylinders 3 and 4. I never noticed anything unusual.
>>There is no other heat damage. The coolant pipe directly behind it to the
>>radiator shows no sign of anything unusual.
>>
>>My questions are:
>>
>>Has anyone ever experienced or heard of anything like this before ? What
>>could be the possible cause ? What is the melting point of stainless steel
>>?
>>
>>There is no direct fresh air to the bottom of the engine. Some time ago I
>>had taped off the starboard NACA duct, as it was supposedly designed for
>>the 914. There was no detrimental effect to the engine temperatures. I
>>have now opened up the precut flap in the starboard side of the alu duct,
>>which will divert some fresh air to the silencer. (I believe this flap was
>>also designed for the 914).
>>
>>One very long shot : Could there be any electrical sparking between the
>>two surfaces, acting like a capacitor ? I just don't see how those high
>>temperatures could come from the exhaust gases without also burning the
>>outside of the fuselage etc.
>>
>>I wonder if anyone knows. And any help greatly appreciated.
>>
>>Karl
>>
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>>
>>
>>
>>
>
>--
>Graham Singleton
>
>Tel: +441629820187
>Mob: +447739582005
>
>
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