Hi Jim,
This is one thing I have been considering but have put off 'cos I am not
aware of any reported incidents of carb icing on the Europa. However, guess
who might be the first! :-(
I certainly don't want to find out the hard way and was thinking of blocking
off the cold air intake and replacing the plenum with the original cone
shaped filters for under cowl air intake just to see.
Regards,
Peter
mailto:peterdavis@ntlworld.com
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-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com]On Behalf Of James Nelson
Subject: Re: Europa-List: Worrying conundrum
Pete,
You need the carb heat blocks to prevent any possible buildup of
ice in the carb area. Its "good" life insurance. Cheep at twice the
price.
Jim
N15JN
<peterdavis@ntlworld.com> writes:
> <peterdavis@ntlworld.com>
>
> I crave people's indulgence with this one.
>
> Last weekend I experienced a very slight vibration that lasted for a
> few
> minutes whilst flying. It was just audible and just noticeable
> through the
> control column. The frequency at 4800 rpm was about 2 or 3 beats per
> second
> and was very reminiscent of "interference" or "sympathetic"
> vibration that
> might occur if part of the 'plane was vibrating in sync. with the
> engine.
>
> I reduced the throttle to see if it would disappear, but the
> frequency just
> reduced with the reduced engine revs. I then opened up the throttle
> and
> experienced what I can only describe as something akin to going over
> "rumble
> strips" on a road in a car, after which the initial vibration
> disappeared.
>
> I have thought about this a lot and cannot come to any conclusion
> about what
> this could be. Has anyone else come across this, and if so could you
> share
> it with me? I really would like to avoid the "silent front end".
>
> My only, very amateur, thought, apart from the electrics going
> 'belly-up' or
> water in the fuel, is - with the under cowl temperature being uneven
> from
> side to side, is it possible for one carb only to get some slight
> icing
> which could produce the vibration which could then clear with
> opening up the
> throttle, with the ice being drawn into the cylinders, thereby
> producing the
> "rumble" effect due to misfiring?
>
> I have on two other occasions experienced this "rumble strip" effect
> and
> tended to put it down to air pockets or some such thing (ignorant
> idiot, I
> hear people say) but with the advent of an ANR headset :-) I was
> able to be
> more aware of the change in 'plane feel prior to the rumble on this
> occasion
>
> Any thoughts would be most gratefully received.
>
> Regards,
>
> Peter
>
> PS - 80hp 912 'classic' with cold air plenum
>
> :peterdavis@ntlworld.com
>
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