Today's Message Index:
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1. 07:27 AM - Xtra Pistons (george.mueller@aurora.org)
2. 07:49 AM - Re: Xtra Pistons (Thomas R. Riddle)
3. 08:04 AM - Re: Xtra Pistons (Thomas R. Riddle)
4. 08:45 AM - Re: Xtra Pistons (Roger Lee)
5. 10:50 PM - Re: Xtra Pistons (K Dilks)
Message 1
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I am anticipating putting my Zenith 701 on floats. Originally I was going
to sell my 80hp 912UL and buy the 912ULS 100hp to get extra power for the
floats. However I have come across a guy who sells high compression
forged pistons (called Xtra) for the 912UL that adds 10-15 horsepower. The
cost is about $850 for the pistons. This seems to be a more cost
effective way to get the extra horsepower for floats (although I have
heard from guys with the 80 hp Rotax on floats and they say it really is
OK unless you are flying out of really small ponds). Does anyone have any
experience with the Xtra pistons? The Xtra guy says he has sold 800 sets
of these pistons worldwide. Is there any downside other than voiding the
rotax warranty?
George in Milwaukee
N701GM 60 hours flying
Message 2
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| Subject: | Re: Xtra Pistons |
George,
I have no personal experience with the Xtra high compression pistons but you
should be aware that there are a lot of differences between the 912UL (79-81
hp) and the higher compression 912ULS (95-100 hp) engines besides the higher
compression. The 912ULS is designed from the ground up for the higher
compression and resulting extra horsepower compared to the 912UL, different
crank, different rods, different cylinders etc. My concern would be the
probable durability and reliability degradation from applying higher
compression to the stock 912UL engine internals.
Thom Riddle
Buffalo, NY
On Thu, Feb 26, 2009 at 10:22 AM, <george.mueller@aurora.org> wrote:
>
> I am anticipating putting my Zenith 701 on floats. Originally I was going
> to sell my 80hp 912UL and buy the 912ULS 100hp to get extra power for the
> floats. However I have come across a guy who sells high compression forged
> pistons (called Xtra) for the 912UL that adds 10-15 horsepower. The cost is
> about $850 for the pistons. This seems to be a more cost effective way to
> get the extra horsepower for floats (although I have heard from guys with
> the 80 hp Rotax on floats and they say it really is OK unless you are flying
> out of really small ponds). Does anyone have any experience with the Xtra
> pistons? The Xtra guy says he has sold 800 sets of these pistons worldwide.
> Is there any downside other than voiding the rotax warranty?
>
>
> George in Milwaukee
> N701GM 60 hours flying
>
> *
>
>
Message 3
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| Subject: | Re: Xtra Pistons |
George,
I forgot to mention that I'm not one of the guys who thinks that 100 HP is
absolutely essential for powering an LSA (floats or no floats). I am
currently flying a RANS S6S with 80hp 912UL and have owned two other
airplanes with 912UL with "only" 80 hp. I actually prefer the 912UL over the
ULS, primarily for the much better economy of operation. 87 octane fuel at 4
gph vs 91 octane fuel at 5 gph makes a significant $ difference if you fly a
lot of hours as I do. Fortunately, I don't need the extra power because I
live in a relatively low density altitude area.
Thom Riddle
Buffalo, NY
On Thu, Feb 26, 2009 at 10:47 AM, Thomas R. Riddle <riddletr@gmail.com>wrote:
> George,
> I have no personal experience with the Xtra high compression pistons but
> you should be aware that there are a lot of differences between the 912UL
> (79-81 hp) and the higher compression 912ULS (95-100 hp) engines besides the
> higher compression. The 912ULS is designed from the ground up for the higher
> compression and resulting extra horsepower compared to the 912UL, different
> crank, different rods, different cylinders etc. My concern would be the
> probable durability and reliability degradation from applying higher
> compression to the stock 912UL engine internals.
>
> Thom Riddle
> Buffalo, NY
>
>
> On Thu, Feb 26, 2009 at 10:22 AM, <george.mueller@aurora.org> wrote:
>
>>
>> I am anticipating putting my Zenith 701 on floats. Originally I was going
>> to sell my 80hp 912UL and buy the 912ULS 100hp to get extra power for the
>> floats. However I have come across a guy who sells high compression forged
>> pistons (called Xtra) for the 912UL that adds 10-15 horsepower. The cost is
>> about $850 for the pistons. This seems to be a more cost effective way to
>> get the extra horsepower for floats (although I have heard from guys with
>> the 80 hp Rotax on floats and they say it really is OK unless you are flying
>> out of really small ponds). Does anyone have any experience with the Xtra
>> pistons? The Xtra guy says he has sold 800 sets of these pistons worldwide.
>> Is there any downside other than voiding the rotax warranty?
>>
>>
>>
>> George in Milwaukee
>> N701GM 60 hours flying
>>
>> *
>>
>>
>
Message 4
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| Subject: | Re: Xtra Pistons |
Hi George,
I'm with Thom on this.
If you need the extra HP go to the 912ULS.
[quote="Thom Riddle"]George,
I have no personal experience with the Xtra high compression pistons but you should
be aware that there are a lot of differences between the 912UL (79-81 hp)
and the higher compression 912ULS (95-100 hp) engines besides the higher compression.
The 912ULS is designed from the ground up for the higher compression
and resulting extra horsepower compared to the 912UL, different crank, different
rods, different cylinders etc. My concern would be the probable durability
and reliabilitydegradationfrom applying higher compression to the stock 912UL
engine internals.
Thom Riddle
Buffalo, NY
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=232242#232242
Message 5
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| Subject: | Re: Xtra Pistons |
Just to clarify.
Differences from 80 to 100 hp.
Crank and rods are same for all the engine including 914.
Cam shaft
compression ratio.
Bigger pistons, cylinders and heads. 80 hp 1211cc
100 hp 1352 cc
Carburettors, different diffuser and jetting.
Airbox.
Spark plugs
Adding compression to 10,5:1 increases by 3-4 hp on a 80 hp.
CC is the answer along with the cam
Kev
--------
Austria .............
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=232303#232303
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