Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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 Posted: Tue Jan 19, 2010 10:17 am Post subject: Bing54 / Max height btw Fuel tank and Mikuni fuel pump |
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At 09:07 AM 1/19/2010, LageB wrote:
| Quote: | It was working fine aro 5-6 operating hours. Few weeks ago, it suddenly started to loose rpms and eventually stopped. I could sometimes get the engine started but never reaching top rpm and after 15-30 sec always stops.
- I opened up the carburator. Cleaned it, replaced Jets and needles etc.
(by the way, unbelievable thing, one needle looked like this:
http://i644.photobucket.com/albums/uu162/LageB/Rotax%20532/DSCN0930.jpg ...)?
YES - after installing the fresh carburator the engine worked well again .. for about 15 minutes. |
It could be that your engine is partially seized from lean mixture (not enough fuel). When this happens, sometimes the engine seems to run fine for a short time, then seizes again as it warms up. To check, you need to pull the exhaust and look at the pistons through the exhaust ports.
| Quote: | Maximum lifting height for the Mikuni
Does anybody here know official figure what is the maximum allowable height from Fuel tank to the Mikuni fuel pump? |
I believe 24" is the recommended maximum.
| Quote: | I think Rotax' above information is somewhat fuzzy and trying to understand Point 2 I hope someone here could clarify physics (a)-(b) as under:
(a) What is the resulting pressure in the case Pumps are installed in series:
- Is it "Pump pressure_1" + "Pump pressure_2" ?? |
With an electric pump pushing fuel to a pulse pump, the final pressure will be whichever pump is putting out the higher pressure, since the pulse pump's output pressure is still limited to the available crankcase pressure. If you had two electric pumps in series, it would be P1+P2.
| Quote: | | b) What is the Pressure in the case of parallel connection? |
Whichever pump's pressure is higher.
A single electric pump with enough pressure (like the Facet) would probably be fine.
Another thing to look for is air leaks in the fuel line... either inside the tank so it starts to suck air after the fuel level drops, or it sucks air at high rpm's and can't keep up with the engine's demand.
Looks like a fun toy btw.
-Dana
--
Can I deduct last years taxes as a bad investment? [quote][b]
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