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tc1917(at)bellsouth.net
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 Posted: Wed Dec 29, 2010 3:39 am Post subject: power loss |
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hello all, hope you had a great holiday season so far. got a question for
someone smarter than I. I know and understand rotax engines but this is
more for a hirth 3503. Friend has one that ran great and then after several
times just taxiing, started acting up. first it would just stop and then
get where it required the enrichers to be on. it will not go past 3000 rpm
which should be more at 6000. I picked up the carb needles and it would run
without the enrichers being on, idle also. helped but not cure. we are
going to put the old larger main jets in and see. it feels as though the
prop is pitched too high, dead throttle the last quarter. if it were a
rotax, I would suspect stuck rings. checked plugs which were black soot and
wet, no carbon build up. it ran great in the air before then but I suspect
he might have overheated it on the ground taxiing. gauges did not work well
so I really dont know. got to pull the exhaust and see what I see and of
course, do a comp test today. any more ideas? dont want to tear this piece
of work down. if it were up to me to send it somewhere, it would be to the
dump. my good friend cannot afford a new engine or another engine or to
rebuild this on. I love my little 912 even with the rum rum. all ideas
welcome even off list. by the way, I get about the same rpm and speed that
the jabiru SS does. we should fly together and see one day. ted cowan,
slingshot, 912ul, rum rum.
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Wed Dec 29, 2010 3:55 am Post subject: power loss |
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Ted, Sounds like you have most of the bases covered already. I hope you don't find any metal transfer when you look at the exhaust side of the piston. All I can think to add is carb ice or a split in the carb connector. Good luck.
Rick Girard
On Wed, Dec 29, 2010 at 5:35 AM, Ted Cowan <tc1917(at)bellsouth.net (tc1917(at)bellsouth.net)> wrote:
| Quote: | --> Kolb-List message posted by: "Ted Cowan" <tc1917(at)bellsouth.net (tc1917(at)bellsouth.net)>
hello all, hope you had a great holiday season so far. got a question for someone smarter than I. I know and understand rotax engines but this is more for a hirth 3503. Friend has one that ran great and then after several times just taxiing, started acting up. first it would just stop and then get where it required the enrichers to be on. it will not go past 3000 rpm which should be more at 6000. I picked up the carb needles and it would run without the enrichers being on, idle also. helped but not cure. we are going to put the old larger main jets in and see. it feels as though the prop is pitched too high, dead throttle the last quarter. if it were a rotax, I would suspect stuck rings. checked plugs which were black soot and wet, no carbon build up. it ran great in the air before then but I suspect he might have overheated it on the ground taxiing. gauges did not work well so I really dont know. got to pull the exhaust and see what I see and of course, do a comp test today. any more ideas? dont want to tear this piece of work down. if it were up to me to send it somewhere, it would be to the dump. my good friend cannot afford a new engine or another engine or to rebuild this on. I love my little 912 even with the rum rum. all ideas welcome even off list. by the way, I get about the same rpm and speed that the jabiru SS does. we should fly together and see one day. ted cowan, slingshot, 912ul, rum rum.
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zeprep251(at)aol.com
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| Posted: Wed Dec 29, 2010 10:07 am Post subject: power loss |
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Ted,
Check exhaust system.
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