jbhart(at)onlyinternet.ne
Guest
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 Posted: Sat Oct 07, 2006 3:51 pm Post subject: Bing Throttle Slide Repair |
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Kolbers,
To improve fuel flow performance consistency, I installed the strongest throttle return spring that Bing offers. After 25 hours, low speed throttle setting became unstable. For example, I would start the engine and begin my taxi out to the engine warm up area. The engine would be turning about 2,000 rpm but a slight nuge to the throttle would send engine speed up to over 3,000 rpm. If one retarded the throttle a trifle, the engine rpm would drop to or below 2,000 rpm. The throttle acted just fine at flight engine speeds, but low engine speeds made for interesting taxiing to and from the runway.
Upon taking the slide from the carburetor, I found significant wear on the
inside of the slide where the spring bumped and wore the pot metal away.
The grooves were so deep that the spring could not expand smoothly up and
down over the grooves. This is what was causing the low engine speed
problem.
I repaired the slide for less than five dollars. The first flight test
showed that the repair improved low speed throttle performance. At this
time I have to build many more hours to see what the slide will look like
after 25 additional hours.
If anyone would like to see the problem and how it was fixed, I added an
update to the bottom of:
http://www.thirdshift.com/jack/firefly/firefly121.html
Had a nice cool flight today. Farmers were harvesting soybeans and corn.
Jack B. Hart FF004
Winchester, IN
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