I have always flow behind a carb engine and I am almost ready to order my engine and firewall forward. For those of you who have gone this road before me and forget the difference in the cost why choose the 912is?
I have always flow behind a carb engine and I am almost ready to order my engine and firewall forward. For those of you who have gone this road before me and forget the difference in the cost why choose the 912is?
I know that there is a lot of extra "stuff" needed for the 912is, Jim. It all takes up space in the engine compartment as well as behind the panel, probably. It is definitely a more complicated engine & install, and is a newer total design that will probably undergo more changes as field experience is accumulated. I would ask the question about how much of an installed weight difference there is between the two. We know the additional installed cost of the fuel injected engine, which will be mitigated somewhat by increased fuel economy. However, I believe that it would take many, many hours/years of operation to reach a break-even point with that additional cost. There are benefits in using fuel injection, of course. No carburetor ice (which is generally a non-issue with a Kitfox installation, but it can happen), perhaps smoother operation and no carburetor balancing needed. Those are just a few points that come to mind.
John Evens
Arvada, CO
Kitfox SS7 N27JE
EAA Lifetime
Chap. 43 honorary Lifetime
I chose the 912 ULS 100 hp again for some of the reasons John mentioned. Weight, complexity, ease of install, familiarity with tuning and maintenance and a proven track record. Fuel economy was considered however I was more comfortable with the simplicity of the whole package.
Also I liked the option to be able to take it to Hal someday and have a big bore kit installed.
That being said, I've heard good comments from those that are flying behind the fuelie Rotax. Fuel economy is really good compared to the 912 ULS versions. They are amazing power plants.
DesertFox4
Admin.
7 Super Sport912 ULS Tri-gear
I bought a 912is. Read back at all the issues balancing carbs and float issues etc etc. I dont want to deal with that. Damn, I hope this install isnt that complicated. Fuel efficiency is a plus too and I will own this thing long enough to recoup the cost difference. That is if I fly it as much as I hope too.
Eddie
We just looked at a 912is installed by Eric Joern on his Kitfox project in Colorado Springs. It's a beautiful engine Eddie (his airplane is beautiful too!) ... I didn't mean to denigrate the engine at all... just trying to think of some pros & cons. I did get a good look at all the extra boxes and things that make it work and do it's magic. Eric commented that he was surprised at how involved the installation was. It's probably pretty straight forward though, and I'm sure it'll go good for you.
John Evens
Arvada, CO
Kitfox SS7 N27JE
EAA Lifetime
Chap. 43 honorary Lifetime
I was dead sure that I would get the 912iS..... until I started looking at numbers. I made some assumptions about fuel cost and projected fuel burn. It appeared to me that it would take me 1000hrs/10years to recoup the extra cost. Having owned a couple of British sports cars with SU and Stromberg carbs, I decided carb balancing would not be a major pain. For these reasons, as well as the thought of being near the bleeding edge of installation experience of a potentially more complex installation, as John mentioned, I decided to go with the 912ULS.
- Gary
S7 SuperSport Tri-gear
w/Rotax 912, Oratex, Dynon
Thank you all for your thoughts on this option. The fuel injection does bring with it more $$ and time for the installation and more glass on the panel. As much as I like the idea of glass I keep coming back to my past experiences with round gauges and the reference scan I am use to. I really like the Garmin G3X and I may go with this with the thought at re-sale time the next guy/gal may want some glass. I do not like my eyes inside the cockpit, I want to see the world and any objects coming my way asap. This is not to say those with glass don't look outside but my recent experiences with a couple fellow pilots who have installed glass spend way to much time looking inside and worrying about a few degree temp changes on the cylinder heads, their engines have been running just fine before they had all this info to look at. As with all choices in life what works for one may or may not be best for the next. I think I will go with what I know and stay with the Carbs, the extra savings can help pay for some instruments.
I hope to meet many of you this year at Oshkosh.