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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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 Posted: Sat Oct 31, 2009 4:57 am Post subject: New throttle linkage |
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The original throttle linkage in Zulu Delta was worn and the throttle cable needed replacing so I took the opportunity.......That's about how most of her mods got started. :-)The goals were to have a system with a simple throttle cable, no clamp screws, and stops at both ends of the levers travel. Nothing fancy, although before I finished I put in an adjustment screw the the lever end of the cable to augment the ones on the top of the carbs. When I set the stops I was very careful to make sure that the carb slides went to top of the throttle bore but no further when the lever was full forward, ie slides have about a 1/4" clearance to the carb top plate so they aren't stressing the cables.
With about 12 hours on the new linkage I've noticed something that strikes me as unusual. When I come off full throttle after take off the throttle has to come back about a quarter of its travel before I get a response from the engine. Once at this point throttle response is proportional to lever movement. I have pulled the air cleaner after landing and this area comes when the slides are about 1/4 to 1/3 down from fully open.
What I know:
All jetting is stock, needles are adjusted to the #2 groove to lean the midrange.
Plugs are new, insulators are light brown.
All temps are in the green at all times.
Engine never stumbles, coughs, burps or exhibits any odd running at any RPM or altitude, although the highest I've had her since refit is 5000' AGL.
I only use full throttle from take off to 700' to 1000' all climbs from that point are done in cruise climb RPM, 5600 to 5800, although I have done climbs as high as 3000' on full throttle during phase one testing. I've run up to full throttle after reaching flight test altitudes (3000' AGL) when doing departure stalls
Carbs are synchronized, the 582 runs like a sewing machine.
There is no binding or obstruction of the throttle cable. Everything works smoothly.
The new linkage has the same ratios and pivot points as the original.
What I don't know:
The only thing I can think of that I do not know is rotary valve timing, I just haven't gotten to checking it.
Any ideas. I should add that I don't think of this as a problem, the engine runs perfectly and has gobs of power. It's just an oddity that's a bit puzzling.
Rick Girard
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jbhart(at)onlyinternet.ne
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| Posted: Sat Oct 31, 2009 7:02 am Post subject: New throttle linkage |
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With about 12 hours on the new linkage I've noticed something that strikes
me as unusual. When I come off full throttle after take off the throttle has
to come back about a quarter of its travel before I get a response from the
engine. Once at this point throttle response is proportional to lever
movement. I have pulled the air cleaner after landing and this area comes
when the slides are about 1/4 to 1/3 down from fully
open.
........
Any ideas. I should add that I don't think of this as a problem, the engine
runs perfectly and has gobs of power. It's just an oddity that's a bit
puzzling.
Rick,
There is nothing unusual about what you are seeing. Most engines are fitted
with oversized carburetors meaning they can pass more air and fuel that the
engine can use to produce its rated hp.
I found this to be true with the Bing 54 on the 447 and the Victor 1+. Both
engines would develop max hp at less than 40% of full slide displacement.
See: http://jackbhart.com/firefly/firefly58d.html
Jack B. Hart FF004
Winchester, IN
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williamtsullivan(at)att.n
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| Posted: Sat Oct 31, 2009 7:37 am Post subject: New throttle linkage |
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What kind of cable housing is it? I can't quite identify it from the photos.
Bill Sullivan
Windsor Locks, Ct.
FS 447
[quote][b]
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Sat Oct 31, 2009 2:01 pm Post subject: New throttle linkage |
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Just the coated stuff they sell at CPS.
Rick Girard
do not archive
On Sat, Oct 31, 2009 at 9:32 AM, william sullivan <williamtsullivan(at)att.net (williamtsullivan(at)att.net)> wrote:
[quote] What kind of cable housing is it? I can't quite identify it from the photos.
Bill Sullivan
Windsor Locks, Ct.
FS 447
[quote][b]
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