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1. 10:08 AM - Upgrade 912UL to 912ULS possible advisable? (JohnFrance)
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| Subject: | Upgrade 912UL to 912ULS possible advisable? |
Good afternoon,
This is my first post on the Rotax forum so hello to everyone.
I have an old (20 years) 912 UL with 500 hours total which I am looking to get
rebuilt to 100 hp ULS spec with soft start. I have had a quote from a professional
Rotax reconditioning outfit, in fact, it was their idea to do it this way
rather than upgrading to a new engine.
After a bit of searching in the Rotax parts catalogue I see the crankshaft on the
UL and the ULS dont have the same serial number, however they do have the same
big end bearings so the dimensions are obviously the same. The 914 has the
same crankshaft as the UL so it can manage the horsepower.
The camshafts are slightly different, again they have a 3 offset on when the valves
are actuated, again the 914 is the same as the UL so it would seem the power
output is not a problem.
The proposed upgrade consists of boring out and relining my cylinders, fitting
new pistons, carburettor jet change plus all the usual tasks during a rebuild
such as changing the reduction gearbox to ULS spec. It is already fitted with
the overload clutch.
I am tempted to go ahead as I dont think there is a structural problem making the
upgrade. Does anyone have any experience or arguments for or against for such
an upgrade?
Best,
John
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Europa mono Nr 192
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http://forums.matronics.com/viewtopic.php?p=494745#494745
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