Today's Message Index:
----------------------
1. 09:33 AM - balancing the carbs (rueffy@jetthrust.com)
2. 11:29 AM - Re: balancing the carbs (Larry McFarland)
3. 06:56 PM - Re: balancing the carbs (rueffy@jetthrust.com)
4. 08:48 PM - Re: balancing the carbs (rueffy@jetthrust.com)
Message 1
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| Subject: | balancing the carbs |
--> Stratus-List message posted by: rueffy@jetthrust.com
Hi guys.
I have just discovered this list and finished reading the archives which have
been a great info source. Myself and a friend have two identical wood/fabric
float planes powered by a stratus EA81 in the Vancouver area. We both just
bought them off the original builders. Mine has about 200 hours on it, and the
heads were done sometime ago, no problem with the engine mounts as yet, but I
have notice the alternator bracket is cracked. The other plane just had the
heads redone after about 40 hours TT and their ignition has just failed. We
area both about to go through our first fuel pump as well. We also have
vibration in certain ranges that sounds similar to what people have discussed
here. Pretty standard stuff it seems.
To reduce vibrations people have suggested the following. (1) balance the carbs
(2) ensure correct belt tension and tracking and (3) get a prop balance. When
balancing the carbs how have people achieved this? When my friends tried to
balance theirs they removed the crossover tube and pluged in the vacuum but a
got wildly fluctuating bouncing up and down between two values. Some ideas
tossed around thought this may be because of the firing order causing all
vacuum, no vacuum, all vacuum, no vacuum etc. I have read of people installing
a "T" in the crossover tube, but then you are just measuring the agregate of
the different pressures so I am not sure how you make sure both are producing
even vacuum? Any ideas appreciated.
Regards
BRETT RUEFF
Vancouver
rueffy@jetthrust.com
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Message 2
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| Subject: | Re: balancing the carbs |
--> Stratus-List message posted by: "Larry McFarland" <larrymc@qconline.com>
Brett,
I've done as you've described with mostly good results, but a piece of
equipment you guys could share is a "Twinmax" for balancing carbs from Bing.
They're $70 or so, but you remove the screw at the protruding stem
next to the idle screw and hook up a plastic tube to each carb. Block off
the crossover hose with a plug and short hose stubs. You get a very precise
reading from the Twinmax that you can adjust to while running.
The other thing is your linkage carb to carb. If you're using two cables
and the spring on throttles to actuate them, singular adjustments are
difficult.
I did a cross linkage that flexes and attaches to the throttle shaft, is
adjustable
but holds the alignment of throttle plates very exactly and requires only
one
throttle arm of the two Bings to be connected to your panel throttle cable.
My site below has pictures on the control linkages and subaru engine pages
if it's even applicable to your birds.
Bings phone number is 1-800-309-2464 and you should probably get the
Bing Carburettors Aircraft Tuning and Parts Manual for $8.00 if you don't
have one as well.
Larry McFarland - 601hds @ www.macsmachine.com
Subject: Stratus-List: balancing the carbs
> --> Stratus-List message posted by: rueffy@jetthrust.com
>
> Hi guys.
>
> I have just discovered this list and finished reading the archives which
> have
> been a great info source. Myself and a friend have two identical
> wood/fabric
> float planes powered by a stratus EA81 in the Vancouver area. >
> To reduce vibrations people have suggested the following.
(1) balance the carbs
> (2) ensure correct belt tension and tracking and (3) get a prop balance.
> When
> balancing the carbs how have people achieved this? When my friends tried
> to
> balance theirs they removed the crossover tube and pluged in the vacuum
> but a
> got wildly fluctuating bouncing up and down between two values. Any
> ideas appreciated.
>
> Regards
> BRETT RUEFF
> Vancouver
> rueffy@jetthrust.com
Message 3
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| Subject: | Re: balancing the carbs |
--> Stratus-List message posted by: rueffy@jetthrust.com
Thanks Larry, i'll look into that. I was planning on getting the bing manual
anyway.
Brett
Quoting Larry McFarland <larrymc@qconline.com>:
> --> Stratus-List message posted by: "Larry McFarland" <larrymc@qconline.com>
>
> Brett,
> I've done as you've described with mostly good results, but a piece of
> equipment you guys could share is a "Twinmax" for balancing carbs from Bing.
> They're $70 or so, but you remove the screw at the protruding stem
> next to the idle screw and hook up a plastic tube to each carb. Block off
> the crossover hose with a plug and short hose stubs. You get a very precise
> reading from the Twinmax that you can adjust to while running.
>
> The other thing is your linkage carb to carb. If you're using two cables
> and the spring on throttles to actuate them, singular adjustments are
> difficult.
> I did a cross linkage that flexes and attaches to the throttle shaft, is
> adjustable
> but holds the alignment of throttle plates very exactly and requires only
> one
> throttle arm of the two Bings to be connected to your panel throttle cable.
> My site below has pictures on the control linkages and subaru engine pages
> if it's even applicable to your birds.
>
> Bings phone number is 1-800-309-2464 and you should probably get the
> Bing Carburettors Aircraft Tuning and Parts Manual for $8.00 if you don't
> have one as well.
>
> Larry McFarland - 601hds @ www.macsmachine.com
>
>
> Subject: Stratus-List: balancing the carbs
>
>
> > --> Stratus-List message posted by: rueffy@jetthrust.com
> >
> > Hi guys.
> >
> > I have just discovered this list and finished reading the archives which
> > have
> > been a great info source. Myself and a friend have two identical
> > wood/fabric
> > float planes powered by a stratus EA81 in the Vancouver area. >
> > To reduce vibrations people have suggested the following.
> (1) balance the carbs
> > (2) ensure correct belt tension and tracking and (3) get a prop balance.
> > When
> > balancing the carbs how have people achieved this? When my friends tried
> > to
> > balance theirs they removed the crossover tube and pluged in the vacuum
> > but a
> > got wildly fluctuating bouncing up and down between two values. Any
> > ideas appreciated.
> >
> > Regards
> > BRETT RUEFF
> > Vancouver
> > rueffy@jetthrust.com
>
>
>
>
>
>
>
Pilots!-For all your aviation resources visit
Jet Thrust.com- The Pilot Network
http://www.jetthrust.com
Please report IMMEDIATELY any abuse/spam or scams of our webmail system to
the webmaster of this website at the following address: webmaster@jetthrust.com
Message 4
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| Subject: | Re: balancing the carbs |
--> Stratus-List message posted by: rueffy@jetthrust.com
Howdy Larry,
I have just finished browsing your website and have a couple of questions. Great
website too by the way.
Firstly with the carbs. When we are bloking the crossover tube and measuring
the vacuum but we can't get an accurate reading because the gauge bounces
eratically. We are assuming this is because the firing order fires the two
pistions on one side, then the two on the other. If this is the case then I
guess you have all suction, then nothing, all suction etc. Do you get this
wild reading? Mine seemed to fluctuate between 4-5 when no suction was
occuring and 13-15 when the suction was occuring. And does the twin max give
stable readings?
The second question is regarding the linkages for the throttle cable to the
carbs. I see you have a great looking fitting with a 90 degree bend that looks
nice and solid. Where did these come from....I have a bad setup with the
throttle cable just shoved into the fitting sleve on the carby which means it
isn't secured very well - I like your fitting.
Brett
Quoting Larry McFarland <larrymc@qconline.com>:
> --> Stratus-List message posted by: "Larry McFarland" <larrymc@qconline.com>
>
> Brett,
> I've done as you've described with mostly good results, but a piece of
> equipment you guys could share is a "Twinmax" for balancing carbs from Bing.
> They're $70 or so, but you remove the screw at the protruding stem
> next to the idle screw and hook up a plastic tube to each carb. Block off
> the crossover hose with a plug and short hose stubs. You get a very precise
> reading from the Twinmax that you can adjust to while running.
>
> The other thing is your linkage carb to carb. If you're using two cables
> and the spring on throttles to actuate them, singular adjustments are
> difficult.
> I did a cross linkage that flexes and attaches to the throttle shaft, is
> adjustable
> but holds the alignment of throttle plates very exactly and requires only
> one
> throttle arm of the two Bings to be connected to your panel throttle cable.
> My site below has pictures on the control linkages and subaru engine pages
> if it's even applicable to your birds.
>
> Bings phone number is 1-800-309-2464 and you should probably get the
> Bing Carburettors Aircraft Tuning and Parts Manual for $8.00 if you don't
> have one as well.
>
> Larry McFarland - 601hds @ www.macsmachine.com
>
>
> Subject: Stratus-List: balancing the carbs
>
>
> > --> Stratus-List message posted by: rueffy@jetthrust.com
> >
> > Hi guys.
> >
> > I have just discovered this list and finished reading the archives which
> > have
> > been a great info source. Myself and a friend have two identical
> > wood/fabric
> > float planes powered by a stratus EA81 in the Vancouver area. >
> > To reduce vibrations people have suggested the following.
> (1) balance the carbs
> > (2) ensure correct belt tension and tracking and (3) get a prop balance.
> > When
> > balancing the carbs how have people achieved this? When my friends tried
> > to
> > balance theirs they removed the crossover tube and pluged in the vacuum
> > but a
> > got wildly fluctuating bouncing up and down between two values. Any
> > ideas appreciated.
> >
> > Regards
> > BRETT RUEFF
> > Vancouver
> > rueffy@jetthrust.com
>
>
>
>
>
>
>
Pilots!-For all your aviation resources visit
Jet Thrust.com- The Pilot Network
http://www.jetthrust.com
Please report IMMEDIATELY any abuse/spam or scams of our webmail system to
the webmaster of this website at the following address: webmaster@jetthrust.com
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