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DAquaNut(at)aol.com
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 Posted: Tue Apr 15, 2008 6:27 pm Post subject: Alternate Firefly engines |
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In a message dated 4/15/2008 12:15:52 P.M. Central Standard Time, jbhart(at)onlyinternet.net writes:
| Quote: | I have not been concerned about top speed. I don't like to fly much faster
than 55 mphi with my head sticking out in the air stream. What I am
interested in is reduced fuel burn rates and increased range.
Jack B. Hart FF004
Winchester, IN
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Hi Jack,
Have you had a chance to make any progress with the mz 34 . I will be up for another De-carb in about 18 more hours. I would just as soon install a different engine at that time. I am still looking at the Kawasaki 340, and the 1/2 vw, and the mz 34. After 88 hours on the 447 I still cannot keep the egts below 1200 *, at 4400 rpm, without them going down to 975- 1000* at cruise. I am to the point now I am going to take a little off of the jet needle in the area of 4400 rpm if I can ever figure out how to compute where that is.
Ed Diebel
It's Tax Time! Get tips, forms and advice on AOL Money & Finance.
[quote][b]
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ElleryWeld(at)aol.com
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| Posted: Tue Apr 15, 2008 7:43 pm Post subject: Alternate Firefly engines |
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I wouldn't install a Kawasaki that sure is recipe for some glider time
Ellery in Maine
do not archive
In a message dated 4/15/2008 10:28:14 P.M. Eastern Daylight Time, DAquaNut(at)aol.com writes:
| Quote: | In a message dated 4/15/2008 12:15:52 P.M. Central Standard Time, jbhart(at)onlyinternet.net writes:
| Quote: | I have not been concerned about top speed. I don't like to fly much faster
than 55 mphi with my head sticking out in the air stream. What I am
interested in is reduced fuel burn rates and increased range.
Jack B. Hart FF004
Winchester, IN
|
Hi Jack,
Have you had a chance to make any progress with the mz 34 . I will be up for another De-carb in about 18 more hours. I would just as soon install a different engine at that time. I am still looking at the Kawasaki 340, and the 1/2 vw, and the mz 34. After 88 hours on the 447 I still cannot keep the egts below 1200 *, at 4400 rpm, without them going down to 975- 1000* at cruise. I am to the point now I am going to take a little off of the jet needle in the area of 4400 rpm if I can ever figure out how to compute where that is.
Ed Diebel
It's Tax Time! Get tips, forms and advice on AOL Money & Finance.
| Quote: |
="http://www.matronics.com/Navigator?Kolb-List">http://www.matronics.com/Navigator?Kolb-List
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://www.matronics.com/contribution">http://www.matronics.com/contribution
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It's Tax Time! Get tips, forms and advice on AOL Money & Finance.
[quote][b]
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DAquaNut(at)aol.com
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| Posted: Tue Apr 15, 2008 8:13 pm Post subject: Alternate Firefly engines |
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In a message dated 4/15/2008 10:43:40 P.M. Central Standard Time, ElleryWeld(at)aol.com writes:
| Quote: | I wouldn't install a Kawasaki that sure is recipe for some glider time
Ellery in Maine
do not archive
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Ellery,
Just curious as to why you would make a statement like that. Do you have first hand experience with the Kawasaki? I had a little over 115 hours on a 440 with zero problems. Never had to mess with jets. Never had to de-carbon at 50 hours! I could let it Idle for several minutes without it loading up. It always started easy and ran and idled smoothly. The Kawasaki was the engine of choice before I ever heard of Rotax. They also have a Nikasil coating on the piston/ cylinder. What experience have you had with a Kawasaki ?
Ed Diebel
It's Tax Time! Get tips, forms and advice on AOL Money & Finance.
[quote][b]
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jbhart(at)onlyinternet.ne
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| Posted: Wed Apr 16, 2008 6:10 am Post subject: Alternate Firefly engines |
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From: DAquaNut(at)aol.com
Date: Tue, 15 Apr 2008 22:23:15 EDT
...................
Have you had a chance to make any progress with the mz 34. I will be
up for another De-carb in about 18 more hours. I would just as soon install
a different engine at that time. I am still looking at the Kawasaki 340,
and the 1/2 vw, and the mz 34. After 88 hours on the 447 I still cannot
keep the egts below 1200 *, at 4400 rpm, without them going down to 975-
1000* at cruise. I am to the point now I am going to take a little off of
the jet needle in the area of 4400 rpm if I can ever figure out how to
compute where that is.
.....................
Ed,
The MZ34 is out of the box and resting on the propeller mounting flange on
the shop floor. The engine mount is done. Right now I am figuring out how
to mount the exhaust system. Also working on how to mount a Mikuni 30 or
24 mm carburetor as I do not understand pumper carburetors. All the steel
has been cut to length for an engine test stand. I have to cut the end
angles so that it can be welded.
I believe I can help you with your needle modification. If you can print
out from:
http://www.thirdshift.com/jack/firefly/firefly121b.html
and reduce the drawing by 50% it will give you a full scale needle drawing
for length. Or each little square is 1/16th of an inch on a side. Also the
drawing shows the needle with the throttle in the closed position relative
to the needle jet. So you should be able to determine which area from which
to remove material.
To start, I would recommend removing material from less than zero to where
the taper starts on the needle. Do not take more than one or two thousands
of an inch off the OD at a time with out a test flight. It may take a half
dozen flights but you should be able to lower the high EGT readings at the
lower rpms, and then to boost the EGT at cruise by dropping the needle a
slot.
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: Wed Apr 16, 2008 8:33 am Post subject: Alternate Firefly engines |
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At 11:09 AM 4/16/2008, Jack B. Hart wrote:
| Quote: |
The MZ34 is out of the box and resting on the propeller mounting flange on
the shop floor. The engine mount is done...
|
Jack, another engine? Did you give up on the Simonini Victor then?
-Dana
--
I intend to live forever or die trying.
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jbhart(at)onlyinternet.ne
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| Posted: Wed Apr 16, 2008 9:36 am Post subject: Alternate Firefly engines |
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At 12:29 PM 4/16/08 -0400, you wrote:
| Quote: |
At 11:09 AM 4/16/2008, Jack B. Hart wrote:
>
>
>The MZ34 is out of the box and resting on the propeller mounting flange on
>the shop floor. The engine mount is done...
Jack, another engine? Did you give up on the Simonini Victor then?
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Dana,
No. The Victor is a good engine, but all the numbers indicate the FireFly
should be able to fly very well with a lower hp engine. This is being
proven out in the UK. Early on, I realized that with the Victor 1+, I was
going to be up against the weight limit just like the Rotax 447. The Victor
burns about one gph less than the Rotax 447, but I still wanted more range.
About three years ago I bought the MZ34. I calculate it will reduce the
present empty weight by 45-50 pounds. By dropping down in hp, I can add
weight back and decrease the total drag, and cruise just as fast with a
lower gph rate. This will let me fit a full enclosure so that I can fly all
winter. If I had not been forced to move, the MZ34 would have already been
mounted. But I am still moving dirt to expose the entrance to my walk out
basement shop etc, etc.
The explosion in fuel cost has accelerated the desire to lower the gph rate.
I still plan to warm weather fly with my head out. At 50-55 mph this is
great fun. Presently with the Victor 1+, I feel like I am saving at least
$3.00 to $4.50 per hour over the Rotax 447. With the MZ34 I hope to save
another $1.00 to $1.50.
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: Wed Apr 16, 2008 7:25 pm Post subject: Alternate Firefly engines |
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At 02:35 PM 4/16/2008, Jack B. Hart wrote:
| Quote: | No. The Victor is a good engine, but all the numbers indicate the FireFly
should be able to fly very well with a lower hp engine...
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What do you think the HP reduction will do to your takeoff and climb
performance?
-Dana
--
Give a man a fish and he will eat for a day. Teach a man to fish and he
will sit in a boat all day drinking beer.
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grantr
Joined: 12 Sep 2007
Posts: 217
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