Today's Message Index:
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1. 09:04 AM - Re: hard Starting Rotax 912ULS (JohnF)
2. 09:40 AM - Re: hard Starting Rotax 912ULS (DHeal)
3. 10:21 AM - Re: hard Starting Rotax 912ULS (JohnF)
Message 1
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| Subject: | Re: hard Starting Rotax 912ULS |
After a lot of thought about hard starting, I took a hint from another RV-12 pilot
and ran the engine on the ground at 4,000 RPM for about 4 minutes, in the
hope that oil fouling of the plugs might be involved, and that the high RPM run
might help clear things up. This is because I typically have to taxi about 3/4
mile after landing to my hangar which might possibly cause oil fouling.
This morning it was fairly chilly so I put on the engine heater (space heater ducted
into the engine cowl) for about 40 minutes.
Upon starting, the engine fired up on the first blade over, just as in the past.
I am going to make it a practice to run the engine at fairly high RPM for a few
minutes just prior to shut down when back at the hangar and see if I get consistent
results.
Thanks for you input.
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http://forums.matronics.com/viewtopic.php?p=473330#473330
Message 2
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| Subject: | Re: hard Starting Rotax 912ULS |
Be sure that your spark plugs are appropriately gapped (.023 in winter and .027
in summer -- I use 0.025 year-round here in moderate Northern California). Be
sure that your throttle is fully closed for the first cold start of the day
and the "choke" is at least partially "on". The instant the engine fires, ease
in a bit of throttle and then gradually remove the choke.
Alternatively, apply "full choke and fully closed throttle" and crank the engine
over for a few revs with the ignition "off" and then stop. Then turn the choke
off, crack the throttle, turn the ignition "on", and start the engine.
In over 550 hours of my RV-12's operation the aforementioned standard ROTAX operating
procedure has worked well. We have extensive taxiing and ground idle operations
here at our controlled airport and I do not think that this negatively
influences subsequent starting of the engine. IMHO, the "4,000 rpm for 4 minutes"
is likely a waste of your time and results in unnecessary wear on your
engine.
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http://forums.matronics.com/viewtopic.php?p=473333#473333
Message 3
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| Subject: | Re: hard Starting Rotax 912ULS |
Thanks, DHeal..... I will try your starting technique and see how that works. I
like it better than the high speed run I tried.
I always gap plugs to .025 year in and out as you do. New plugs every annual because
they are so inexpensive.
325 hours on the plane and this odd starting thing just came up...again, thanks.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=473334#473334
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