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Hi Georges,
That was my initial assessment (and may continue to be), however, I did
order and get the plugs that were recommended and had put them in the day
before the incident. The apex seals were damaged (one broken into three
pieces) and my conclusion was that the ground electrode stuck down into the
chamber enough to catch the seals. However, I stuck one of the new plugs
into an old 86 NA rotor housing and the end of the plug (ground electrode)
was at least 5mm away from the entry to the combustion chamber - so no way
could it have clipped the apex seals. Now the question do the 91 turbo
housings I am flying with have a shorter sparkplug hole? Hard to believe
that it would - but if the same as the NA then I am forced to conclude that
something other than the plugs caused the damage. Will have it opened up
tomorrow and hopefully will know more.
Lots of carbon is normal for any 13B pulled from an auto as they inject
crankcase oil which is not designed to burn cleanly and leaves lots of
carbon and crap to stick seals. So that's par for the course. The missing
chrome is of more concern, but some people will say that an housing in the
condition of yours is still work using. Perhaps for a car, but I would
hesitate to put them into an aircraft installation - personal opinion of
courses.
Tracy now uses the Rensis engine, but previously he and I both used the 91
turbo housing (sans turbo) and high compression rotors (9.7:1). Be advised
that you can use your eccentric shaft with the 9.7s that your counter
weights if they did not come from a engine with 9.7:1 rotors will not be
heavy enough. Not to say it won't run with them but you will have some
vibration.
Also the turbo housings do not have the exhaust splitters that the NA
housing do - therefore the exhaust sound is more intense and sharper -
harder to quite.
Ed A
----- Original Message -----
From: "G.Boucher" <echolakeresort@telus.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, April 11, 2005 6:46 PM
Subject: [FlyRotary] Re: Washing Machine Was [FlyRotary] Re: The Verdit! c
wasRe: [FlyRotary] No Joy on Sun & Fun{:<(
Hi! Ed
Do I understand correctly the spark plug you used were longer than the
stoke
NGK? I'm not having a great day here ether, my new Computer (3.4GHZ) just
shut down telling me the processor was "over-clocking" now I have a blue
screen that says that windows is shutting down for my safety. Luckily I
have
a couple of other computers in the house that I can use. Then I just
opened
my supposedly "good" 13b, found a lot of carbon on the rotors, the step on
the end plates was 0.0015mm (within specs) but both rotor housings have a
2
to 3mm strip of chrome missing on one edge & adeep grove(not through the
chrome) about 3mm from the edge there is a slight scratch between the
lower
plug & exhaust port. So I guess they are toast!! so since I need more
parts
I think I should get a turbo core use my e shaft, counter weights & 9.7:1
rotors I think that is what Tracy has in the RVOtter.
Georges Boucher
----- Original Message -----
From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, April 11, 2005 4:50 PM
Subject: [FlyRotary] Re: Washing Machine Was [FlyRotary] Re: The Verdit! c
wasRe: [FlyRotary] No Joy on Sun & Fun{:<(
>
>
>> > Arrrrrrgggg!
>> >
>> > Ed A
>>
>>
>> Just be glad she didn't tell you to stop & paint the house + install
>> 1200 sq feet of vinyl soffits.
>>
>> Charlie
>> (5 months behind on RV-7 construction)
>>
>> You're right Charlie, its all relative and my washing machine pain is
>> over
> with. Tomorrow the engine gets torn down.
>
> Ed
>
>
>
>>> Homepage: http://www.flyrotary.com/
>>> Archive: http://lancaironline.net/lists/flyrotary/List.html
>
>
> --
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>
>
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>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html
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