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Remi Guerner
Joined: 14 Dec 2010
Posts: 284
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 Posted: Sun Jan 23, 2011 12:53 am Post subject: 912 S/ULS compression ratio |
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On the last issue (April 1st, 2010) of the Rotax 912 series Operator Manual, the compression ratio of the 912S/ULS has been increased to 11:1. See page 1-14. Previously it was 10.5:1. Surprisingly there is no mention of any affected performance figure. Does anyone know whether this is just a correction of a mistake in the documentation, or a real modification of the cylinder head or piston geometry?
Regards
Remi Guerner
Europa F-PGKL
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Sun Jan 23, 2011 6:39 am Post subject: Re: 912 S/ULS compression ratio |
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Hi Remi,
I just got my email back. It is only a typo.
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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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Remi Guerner
Joined: 14 Dec 2010
Posts: 284
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| Posted: Tue Jan 25, 2011 4:34 am Post subject: Re: 912 S/ULS compression ratio |
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Hi Roger,
I am not convinced by your reply. The change to 11:1 was clearly made on purpose as the writer draw a vertical line on the left side of the text to highlight the change. So Rotax clearly says that the compression ratio is now 11:1. The question is: was the previous figure (10.5:1) true or wrong?
If it was true, that means they have made a physical modification somewhere.
Remi
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Tue Jan 25, 2011 5:40 am Post subject: Re: 912 S/ULS compression ratio |
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I emailed Rotax and got a reply. It is a typo and nothing more. They just missed it. Chalk it up to a poor proof read. jacking that up from 10.5 to 11.0 would have been a really big deal to them and us.
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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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Remi Guerner
Joined: 14 Dec 2010
Posts: 284
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| Posted: Tue Jan 25, 2011 8:18 am Post subject: Re: 912 S/ULS compression ratio |
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Ok, thanks Roger, I suppose they will make a correction on the next edition of this manual. Wait and see!
Remi
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