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h&jeuropa
Joined: 07 Nov 2006
Posts: 654
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 Posted: Tue Jul 31, 2012 4:42 pm Post subject: Re: Vapour lock? Why? |
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Frans,
Forgot to mention, you talk of differential fuel pressure of 6 psi. Rotax specifies differential fuel pressure to be 3.63 psi nominal, 5.08 psi max and 2.18 psi min. It's easy to adjust the fuel pressure regulator using a mechanical gauge. Don't know if this has any bearing on your situation.
Jim & Heather
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Richard Lamprey
Joined: 15 Jul 2011
Posts: 95
Location: Kenya
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| Posted: Wed Aug 01, 2012 12:30 am Post subject: Re: Vapour lock? Why? |
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Frans,
In Kenya I operate my Europa classic with 912UL (ground-adjustable warpdrive prop) from a strip at 5,500' elevation, often when airtemp is around 27-30C, therefore density altitude is about 8500'. I use mogas unleaded (without ethanol), which is rated at 93 Octane. My carb lines under the cowling are all shielded with orange fire-sleave hose. I usually cruise at 8500-10500' indicated (density altitude up to 13,000')
Sometimes, after flight and long taxi back to hangar, it runs a little rough due I think to vapour, and only once, on a very long taxi and hold, did it really start to splutter and the port-side carb was boiling (bubbling up into the equalizer pipe).
On warm up from cold start, the temps have always stabilized at 70C for coolant temp, and 60 C for oil temp, and takeoff has been fine. I have had other problems with rough running or lack of power, which I have traced to other things... one throttle cable not running straight and smooth (scary, I replaced the throttle box)... and insect-blocked equalizer pipe from carb to plenum (which caused the carb to overflow), but nothing in flight I can trace to vapour locking.
For me, take-off at 4000' is a luxury, with 5Y-LRY climbing out like a homesick angel...
Best
Richard
Kenya
, a long taXI-BACK I only recall once having a problem with vapour locking, after long taxi. when it ran a little rough
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frans(at)privatepilots.nl
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| Posted: Wed Aug 01, 2012 12:51 pm Post subject: Vapour lock? Why? |
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On 08/01/2012 02:42 AM, h&jeuropa wrote:
| Quote: |
<butcher43(at)att.net>
Forgot to mention, you talk of differential fuel pressure of 6 psi.
Rotax specifies differential fuel pressure to be 3.63 psi nominal,
5.08 psi max and 2.18 psi min.
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You are right. My fuel pressure is normally 3.8. Only on idle with both
pumps on the fuel pressure goes to 5.1 but falls back to 3.8 if the
engine starts to consume some more fuel.
Frans
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