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Old 10-22-2013, 07:25 PM
KALEWIS's Avatar
Join Date: Nov 2009
Location: Jackson, OH
Posts: 466
Default What problems has anyone had lately with the Rotax 912ULS

Any Mx issues on the -12 installation to look for. Also, any condition inspection items to look at?
Airspeed, Altitude, or need at least two

RV-12 #328
At 260 Hrs on the Hobbs
Click on above for build site
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Old 10-22-2013, 09:53 PM
Jetguy's Avatar
Jetguy Jetguy is online now
Join Date: Aug 2008
Location: Texas, Fort Worth
Posts: 1,228
Thumbs up Glad you asked that question!

With 500 hours on the engine I have replaced 2 old type fuel pumps. Now have the new type, so far it seems to be working fine. One of my carb floats stopped floating so I replaced with new one. Other than that everything has been working great. I really like the engine so far. However if my engine fell into the serial number group with the crank shaft SB then I would not be a happy guy.
Things I like about the engine.
Sips fuel.
Power to weight ratio, 100 hp, out the crate weight 122lbs.
No magnetos.
Auto spark plugs.
50 hour oil change.
Runs on unleaded gas even with ethanol.
Starts super easy.
Really like the web site with all the great info including the videos for do-it-yourself types like me
Feel free to add to this list!

That being said I think Rotax should, for free of charge, fix all the engines that fall into the SB. All engines have occasional SBs. It a part of life. Doesn't seem one is any better that the other one. The RV12 was designed around the Rotax. Adding a heavier engine will change the aerodynamics of the airplane. I'm conservative and don't want to be a test pilot so I'm sticking with the stock setup. I think that's why the RV12 has been so successful. I would say less than 1% have a different type of engine on it.
Pardon me while I rant a little
The RV12 kit was released for sale in April 2008. Almost 800 serial numbers having been sold. We are getting close to 300 completed flying RV12s in 5 years. A long life span was considered durning its design as well as a perfect harmony in over flight characteristics and performance for the average pilot. Although it can be built as an EAB it really wasn't designed to be built far from its original plans. So when changing to an alternate engine consider the weight you will be adding to the nose and how that will effect the flying characteristics of it. Will you do spin tests with this heavier engine? Also consider there would be nothing worse than the 1000 hours of you personal labor sitting all bent to heck in the corn field at the end of the runway not to mention your personal well being as you exit the plane in that field. This all being said we are taking about an experimental airplane here so if you have the experience and support network to change to something different safely then good luck in your endeavor.
RV12 N1212K
Flying Since June 2010
1020 Hours as of 9/30/2017
RV14 Wing, arrived and building at Rdog's new Hanger at 16X
S/N 140014
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Old 10-23-2013, 05:42 AM
Dave12 Dave12 is offline
Join Date: Oct 2010
Location: Elkton, Md.
Posts: 1,296

Originally Posted by KALEWIS View Post
Any Mx issues on the -12 installation to look for. Also, any condition inspection items to look at?
Recently, while performing the ignition check during run-up, the engine quit when I switched off the right ignition. I immediately switched it back on to keep the engine from shutting off. I immediately re-performed the run-up which was fine. I performed several subsequent run-ups that were fine. Approx. 1 week ago I noticed for the first time ever, a rough running ign. check, that again cleared itself on the next attempt. I am going to discuss this with Lockwood's today, but I am suspecting ignition module(s). Anyone else experience this?
Proud Dad of a Navy Corpsman
FMF "Devil Doc" 2nd Marines
N588DF RV12 #336 Sold
N73DF RV12 #244 Flying
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Old 10-23-2013, 06:00 AM
Join Date: Nov 2007
Location: Jesup, Iowa
Posts: 1,574
Default Yes Dave - -

I reported some time back that both my ign modules failed between 400 - 500 hours. ROTAX has a program for buying a pair at less than the normal cost for one. I assume they still have it. Check with any of the main centers. I got mine thru Lockwood. They did tell me that they did not advertise it, but it was available. The new ones have soft-start also, so for us early builders, it was an improvement. No idea if they actually improved the modules, or just offered at lower price. I said at the time that everyone should be aware of this issue. I can go back and find the thread if anyone is interested.
John Bender
Flying RV-12 - Serial #120036
Paid in May ( 5-10-17 )
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Old 10-23-2013, 09:20 AM
videobobk's Avatar
videobobk videobobk is offline
Join Date: Jan 2005
Location: Near Scipio, in Southern Indiana
Posts: 1,761

With over 200 hours on EN1 (first plane built by kids in a High School) we have had a couple broken exhaust springs. As a trainer it gets some pretty hard use. We didn't have idle set right at first (our problem, not Rotax) and it would die in flair if pulled all the way back. I suppose that could be a bit disconcerting on a first solo! Pretty easy fix, and a great engine. Starts/runs fine and is a pleasure to fly.

Bob Kelly, Scipio, Indiana
Tech Counselor
Founder, Eagle's Nest Projects
President, AviationNation, Inc
RV-9A N908BL, Flying
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Old 10-23-2013, 03:02 PM
NASA515 NASA515 is offline
Join Date: Nov 2011
Location: Hansville, Washington
Posts: 536

Mine quit on the second landing! But, I restarted it during the rollout and taxied back to the hangar. With Tony T's help, we reset the Idle speed (set way too low), and no problems since.

Actually, didn't scare me at all - figured I was landing anyway. Was glad I didn't have to call anybody for a tow in.

Bob Bogash
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Old 02-18-2018, 09:04 AM
waterboy2110 waterboy2110 is offline
Join Date: Jul 2010
Location: SF Bay Area
Posts: 239

In flight engine failure due to engine loading stemming from prop pitch as prescribed by the KAI.
Instrument Rating
A&P / Rotax iRMT 9 Series Maintenance
RV12 Flying.
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Old 02-18-2018, 07:52 PM
rvbuilder2002 rvbuilder2002 is offline
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 7,320

You really should let this go.

With all of the time I have spent communicating with the North America Rotax distributor on your behalf (Kodiak), it stands to reason that they would have had a sit down with Van's Aircraft to suggest some changes, or at the very least, suggested to me in those communications that your climb RPM could have been the cause.

Instead they were adamant that your purposed cause is not what caused the failure.

What really did?

We will probably never know since you submitted a partially disassembled engine to CPS for inspection.
Since the entire induction system (carb's, intake manifolds, etc.) had already been removed and weren't provide for inspection it wasn't possible for Brian to to do a full inspection and determine what the cause might have been.

As is often the case, there is more to this store than has been made public, but it is not appropriate for me to be the one to do so........
Any opinions expressed in this message are my own and not necessarily those of my employer.

Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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Old 02-19-2018, 05:16 AM
Dave12 Dave12 is offline
Join Date: Oct 2010
Location: Elkton, Md.
Posts: 1,296

Inquiring minds would like to know what really happened?
Proud Dad of a Navy Corpsman
FMF "Devil Doc" 2nd Marines
N588DF RV12 #336 Sold
N73DF RV12 #244 Flying
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