Today's Message Index:
----------------------
1. 07:41 AM - Belt rumble vibration (Phil Raker)
2. 08:01 AM - Re: Belt rumble vibration (The Meiste's)
3. 02:30 PM - Re: Belt rumble vibration (gary)
Message 1
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Subject: | Belt rumble vibration |
--> Stratus-List message posted by: Phil Raker <phadr1@yahoo.com>
Larry,
If, as you say, the vibration is only in a fairly narrow RPM band, and if
that band isn't at a normal operating speed (I doubt that you'd cruise the
Stratus for very long at 25-2800), then perhaps the solution is a yellow band
on the tachometer. I remember some others writing about a similar issue a year
or so ago. Did you check the archives? As I recall, the conclusion was that
the belt vibrated when run at certain speeds - not full speed or cruise
settings.
Doc, it hurts when I hit my head on the wall. -> So don't hit your head on
the wall.
My engine vibrates in a certain RPM range. -> So don't run it in that
range.
It sounds like an over-simplification, but that may be the best solution,
especially if it's smooth at all other speeds.
Phil Raker N556P HDS/Stratus ~85% completed
Subject: Stratus-List: Belt rumble vibration
--> Stratus-List message posted by: "Larry McFarland" <larrymc@qconline.com>
>
> It doesn't change when running off the A-distributor ignition or B-flywheel
> ignition, so perhaps it's the belt or my mixture.
>
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Message 2
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Subject: | Re: Belt rumble vibration |
--> Stratus-List message posted by: "The Meiste's" <meiste@essex1.com>
still a rumble, vibration band at 2500 to 2800 rpm
++++++++++++++++++++++++++++++++++
Larry,
I get the same vib's but mine is about 3,300 RPM, so I also simply try to
avoid that setting if possible. As nothing I found makes it go away.
Kelly
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Message 3
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Subject: | Re: Belt rumble vibration |
--> Stratus-List message posted by: "gary" <FlyinK@Efortress.com>
you could run it without the prop to baseline the vibration level. if it's
rough, work on the engine, if it's smooth, work on the prop/spinner.
dynamic balance is well worth it and i found that getting every blade
exactly the same helps. takes a little longer to fiddle with prop when
adjusting pitch but i think it pays off. if you get a balance, make sure
you put spinner on.
Gary Krysztopik
Pelican PL - N522GK
Stratus Subaru EA-81
Newport, RI
http://members.efortress.com/flyink/index.html
----- Original Message -----
From: "Larry McFarland" <larrymc@qconline.com>
Subject: Stratus-List: Belt rumble vibration
> --> Stratus-List message posted by: "Larry McFarland"
> <larrymc@qconline.com>
>
> Hi guys,
> I've been chasing a pulse thinking the engine was missing
> because it vibrates a bit when it's cold and the pulse is felt until
> things warm
> up. After replacing the rotor, cap, plugs and checking coils and wires,
> it
> runs well warm, but there is still a rumble, vibration band at 2500 to
> 2800 rpm
> that seems a bit intense. Above and below that band everything sounds
> smooth.
> Am I looking at the difference between the seasonal warm of recent and the
> cold
> which is only 30-40 degrees cooler? It doesn't change when running off
> the A-distributor
> ignition or B-flywheel ignition, so perhaps it's the belt or my mixture.
> Still a 60-70 degree
> difference in EGTs, right being higher. Belt is snug to spec and the prop
> is tracking
> within 1/32" each blade, but there's still more vibration than I'd like to
> fly with.
>
> Any ideas on this? I feel like I've missed something here.
>
> Larry McFarland - 601HDS - Stratus at 45 hours and holding.
>
>
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>
>
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