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williamtsullivan(at)att.n
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 Posted: Tue Apr 20, 2010 4:43 am Post subject: Firefly slide show |
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Jack- How are you doing on the new engine? Haven't heard from you lately.
do not archive
Bill Sullivan
Windsor Locks, Ct.
FS 447
[quote][b]
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jbhart(at)onlyinternet.ne
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| Posted: Tue Apr 20, 2010 3:57 pm Post subject: Firefly slide show |
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Date: Tue, 20 Apr 2010 05:28:05 -0700 (PDT)
From: william sullivan <williamtsullivan(at)att.net>
Jack- How are you doing on the new engine? Haven't heard from you lately.
Bill,
Initially thought that the engine quit on the maiden flight due to
electrical problems. Did not like the way I had mounted the voltage
regulator and magneto kill switch. The regulator leads wiggled loose and
shorted. Reworked the whole works to come up with a better mounting and in
doing so saved a little weight. Also insulated the lead clips with shrink
tubing and then wire tied them in a way to prevent the clips from ever
coming loose. Also, to get the engine up to speed I purchased new set of 54
inch IVO ultralight blades.
Mounted the whole works and tried starting the engine. Found that the
engine would run a burst after the engine was primed and that was it. I
took the carburetor off and looked at the lower end to see if the metering
needle valve was stuck, and replaced the regulator diaphragm and the pump
parts. After this I have been able to get the engine to run, but now I am
having trouble with the engine loading up on fuel upon closing the throttle
after a high rpm run on the high speed jet. Upon cranking the engine
without priming, the engine floods. This indicates that the metering needle
is not seating, or very high flow resistance through the air filter.
Tomorrow, I will remove the air cleaner and see if the flooding problem
continues. If so, I will remove the carburetor and blow out the fuel
galleys up to and through the metering needle seat. And the try again.
The trials and tribulations of changing engines and learning about the
Tillotson carburetor.
Jack B. Hart FF004
Winchester, IN
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Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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| Posted: Tue Apr 20, 2010 5:48 pm Post subject: Firefly slide show |
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At 08:58 PM 4/20/2010, Jack B. Hart wrote:
| Quote: | The trials and tribulations of changing engines and learning about the
Tillotson carburetor. |
Jack, here's a couple of sites that might have some useful information. It's a ppg site but engines are engines...
http://aerocorsair.com/id27.htm
http://aerocorsair.com/id28.htm
http://www.aerocorsair.com/id150.htm
-Dana
--
When I was young I was told that anyone could be President. I'm beginning to believe it. [quote][b]
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Wed Apr 21, 2010 4:48 am Post subject: Firefly slide show |
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Jack, I had many of the same problems with the Mikuni pumper carb on a Zenoah engine. In my case, the problem was a very small tear in the pump diaphragm. The solution was real simple, dump the pumper carb (Mikuni had stopped making the carb and repair kits for it) and replace with a conventional slide carb and separate fuel pump. Started first pull and never had another problem.
Rick Girard
On Tue, Apr 20, 2010 at 7:58 PM, Jack B. Hart <jbhart(at)onlyinternet.net (jbhart(at)onlyinternet.net)> wrote:
[quote] --> Kolb-List message posted by: "Jack B. Hart" <jbhart(at)onlyinternet.net (jbhart(at)onlyinternet.net)>
Date: Tue, 20 Apr 2010 05:28:05 -0700 (PDT)
From: william sullivan <williamtsullivan(at)att.net (williamtsullivan(at)att.net)>
Jack- How are you doing on the new engine? Haven't heard from you lately.
Bill,
Initially thought that the engine quit on the maiden flight due to
electrical problems. Did not like the way I had mounted the voltage
regulator and magneto kill switch. The regulator leads wiggled loose and
shorted. Reworked the whole works to come up with a better mounting and in
doing so saved a little weight. Also insulated the lead clips with shrink
tubing and then wire tied them in a way to prevent the clips from ever
coming loose. Also, to get the engine up to speed I purchased new set of 54
inch IVO ultralight blades.
Mounted the whole works and tried starting the engine. Found that the
engine would run a burst after the engine was primed and that was it. I
took the carburetor off and looked at the lower end to see if the metering
needle valve was stuck, and replaced the regulator diaphragm and the pump
parts. After this I have been able to get the engine to run, but now I am
having trouble with the engine loading up on fuel upon closing the throttle
after a high rpm run on the high speed jet. Upon cranking the engine
without priming, the engine floods. This indicates that the metering needle
is not seating, or very high flow resistance through the air filter.
Tomorrow, I will remove the air cleaner and see if the flooding problem
continues. If so, I will remove the carburetor and blow out the fuel
galleys up to and through the metering needle seat. And the try again.
The trials and tribulations of changing engines and learning about the
Tillotson carburetor.
Jack B. Hart FF004
Winchester, IN
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jbhart(at)onlyinternet.ne
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| Posted: Wed Apr 21, 2010 7:45 am Post subject: Firefly slide show |
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Date: Wed, 21 Apr 2010 07:48:00 -0500
From: Richard Girard <aslsa.rng(at)gmail.com>
| Quote: |
Jack, I had many of the same problems with the Mikuni pumper carb on a
|
Zenoah engine. In my case, the problem was a very small tear in the pump
diaphragm. The solution was real simple, dump the pumper carb (Mikuni had
stopped making the carb and repair kits for it) and replace with a
conventional slide carb and separate fuel pump. Started first pull and never
had another problem.
Rick,
Supposedly there are several engines out there using this carburetor. I am
still on the lower end of the learning curve, so I will keep working with
for a while to see if I can master it.
Jack B. Hart FF004
Winchester, IN
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