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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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 Posted: Sun Jan 30, 2011 6:19 am Post subject: rumor I heard |
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This is directed to Roger Lee or anyone else who might know.
I read the following on another list this morning and would like to know if there is any truth in this.
THis is rumor until I see it.
There is a kit coming out to reduce the compression ratio of the Rotax 912S from
10.1:1 to something lower. It is rumored that there will be bigger jugs and
pistons to try to raise the displacement from just over 1300 CCs to something
closer to our 2200 CCs.
It will raise the HP from 98 to around 110 HP.
More displacement= more torque and less need for high octane gas.
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_________________
Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
- Anonymous |
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Sun Jan 30, 2011 6:52 am Post subject: Re: rumor I heard |
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Hi Thom,
I have not heard that, but I know just who to ask. I'll keep in touch.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Sun Jan 30, 2011 9:55 am Post subject: Re: rumor I heard |
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Hi Thom,
Got my email back. Pure BS. Let them run with it and sit back and smile, it's all garbage.
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Sun Jan 30, 2011 10:07 am Post subject: rumor I heard |
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Thom, That's going to be some trick to accomplish. The bore of a 912 ULS is 84mm (3.31")and the stroke is 61mm (2.40"). Leaving the stroke alone, to get a displacement of 2200 cc the bore has to increase to 107mm (4.22"). I don't think you can get there from here.
Rick
On Sun, Jan 30, 2011 at 8:19 AM, Thom Riddle <riddletr(at)gmail.com (riddletr(at)gmail.com)> wrote:
| Quote: | --> RotaxEngines-List message posted by: "Thom Riddle" <riddletr(at)gmail.com (riddletr(at)gmail.com)>
This is directed to Roger Lee or anyone else who might know.
I read the following on another list this morning and would like to know if there is any truth in this.
THis is rumor until I see it.
There is a kit coming out to reduce the compression ratio of the Rotax 912S from
10.1:1 to something lower. It is rumored that there will be bigger jugs and
pistons to try to raise the displacement from just over 1300 CCs to something
closer to our 2200 CCs.
It will raise the HP from 98 to around 110 HP.
More displacement= more torque and less need for high octane gas.
--------
Thom Riddle
Buffalo, NY (9G0)
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x32
Don't accept your dog's admiration as conclusive evidence that you are wonderful.”
—Ann Landers
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=328973#328973
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Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
[quote][b]
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The smallest miracle right in front of you is enough to make you happy.... |
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Sun Jan 30, 2011 11:22 am Post subject: Re: rumor I heard |
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It did not sound like a reasonable modification to me either. However, some rumors are wild exaggerations with some element of truth, so I was interested to see if there was anything at all to it.
The one mod/option I think we would all like to see is EFI.
Any chance of THiS being in the works?
Do not archive
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Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
- Anonymous |
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Sun Jan 30, 2011 1:10 pm Post subject: Re: rumor I heard |
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EFI has been in the works for a couple of years. My guess it will be about a $6K option. It is part electronic and part mechanical from what I hear. I hope it comes out this year, but who knows for sure.
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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flyadive(at)gmail.com
Guest
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| Posted: Sun Jan 30, 2011 5:14 pm Post subject: rumor I heard |
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Rick:
Companies do some pretty stupid things but this sure sounds like a hoax.
If you consider that 1300cc produces 98 HP that is .075HP per cc. With 2200cc (at).075 HP/cc you would expect to see something like 165HP but figure something like 75% efficiency so that would be 124 HP. So, where do they get 112 HP? Kind of defeats the purpose? Why do ALL that changing and work for ONLY a 12 HP gain.
It would make more sense to increase the compression to gain the HP. Example: a Lycomming went from 150 HP (at) 7.5:1 to 160 HP (at) 8:1. So there saw a gain of 6.25%. If Rotatx went up ONLY 6.25% that would be 104HP and if they went to 11:1 that would be 110 HP with ONLY a piston change. NOW, these are only paper numbers, there very well could be a greater increase. BUT! Could the cylinders handle it?
Barry
On Sun, Jan 30, 2011 at 1:04 PM, Richard Girard <aslsa.rng(at)gmail.com (aslsa.rng(at)gmail.com)> wrote:
[quote] Thom, That's going to be some trick to accomplish. The bore of a 912 ULS is 84mm (3.31")and the stroke is 61mm (2.40"). Leaving the stroke alone, to get a displacement of 2200 cc the bore has to increase to 107mm (4.22"). I don't think you can get there from here.
Rick
On Sun, Jan 30, 2011 at 8:19 AM, Thom Riddle <riddletr(at)gmail.com (riddletr(at)gmail.com)> wrote:
| Quote: | --> RotaxEngines-List message posted by: "Thom Riddle" <riddletr(at)gmail.com (riddletr(at)gmail.com)>
This is directed to Roger Lee or anyone else who might know.
I read the following on another list this morning and would like to know if there is any truth in this.
THis is rumor until I see it.
There is a kit coming out to reduce the compression ratio of the Rotax 912S from
10.1:1 to something lower. It is rumored that there will be bigger jugs and
pistons to try to raise the displacement from just over 1300 CCs to something
closer to our 2200 CCs.
It will raise the HP from 98 to around 110 HP.
More displacement= more torque and less need for high octane gas.
--------
Thom Riddle
Buffalo, NY (9G0)
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x32
Don't accept your dog's admiration as conclusive evidence that you are wonderful.”
—Ann Landers
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=328973#328973
===========
-List" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List
===========
http://forums.matronics.com
===========
le, List Admin.
="_blank">http://www.matronics.com/contribution
===========
|
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
| Quote: |
ist" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
|
[b]
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RotaxEngines-List |
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lucien
Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM
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| Posted: Mon Jan 31, 2011 5:41 am Post subject: Re: rumor I heard |
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| Roger Lee wrote: | | EFI has been in the works for a couple of years. My guess it will be about a $6K option. It is part electronic and part mechanical from what I hear. I hope it comes out this year, but who knows for sure. |
Hopefully carbs will still be available and the FI will remain just an option? I'd rather stick with carbs on my next 912.
EFI is great until it breaks. Then there's no hope of ever figuring out what's wrong with it or being able to afford the repairs (if it's going to be anything like auto EFI).
Carbs are just so much simpler to debug and fix, so I'd rather just stick with em....
LS
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LS
Titan II SS |
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Mon Jan 31, 2011 4:51 pm Post subject: rumor I heard |
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As much as I like carbs I always thought the EFI was easier to work on...
Each part can be individually tested and or replaced. I've even been able
to replace coils in Chev Cavalier ECUs.
With the EFI it works yes or works no... If it works maybe then the problem
is wiring.
Carbs can require a lot more tinkering and when you get them to work they
impart a feeling of accomplishment.
Noel
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