914 cylinders on 912uls
Hi. Does anyone know if the 914 cylinders and pistons fit on the 912uls case?
Thanks
Hi. Does anyone know if the 914 cylinders and pistons fit on the 912uls case?
Thanks
by Ed Midgley » 10 months ago
Yes they will fit. I believe you will have to use the 914 heads also.
The camshafts are different so I’m not sure how that would work if you intend to turbo charge the engine.
Ed
by Rotax-Owner » 10 months ago
In theory, they should fit. However, as Ed pointed out, the 912ULS has a different camshaft, and you would also require the cylinder heads from the 914. This is because the cylinders on the 914 have a smaller displacement compared to the 912ULS. The flywheel of the 914 is also distinct from the 912UL and 912ULS, primarily due to the 914 being turbocharged and needing different timing.
Significant differences exist between the 912UL/914 and the 912ULS. As a result, we don't possess the information or experience to predict how the engine will perform in the configuration you're inquiring about.
by Charl Starke » 10 months ago
Many thanks for the reply. I am aware of the camshaft and timing differences but other than that I am assuming that all is interchangeable...even the gearbox.
by Rotax Wizard » 10 months ago
The gearboxes may be different. On the 914UL the overload clutch is optional. on the 912ULS most everyone has an overload clutch. The type 914 has the small starter, it only has a 9 to 1 compression ratio. The 912ULS should have the large starter to overcome the 11 to 1 compression ratio. The newer 914 engines also have sodium filled valve stems on the exhaust side, the 912 does not.
The electrical wiring for the ignition is done differently to accommodate the staggered run timing in the 914....912 runs at 26 BTDC and the 914 26 on circuit A and 22 on circuit B. Additionally A is firing all top plugs and B all bottom on the 914. The 912 it is staggered A = T1 and T2, B3 and B4. B= B1 and B2, T3 and T4.
yup, a number of differences to consider if you are switching parts.
Cheers
To receive critical-to-safety information on your ROTAX Engine, please subscribe to |
ROTALK NEWS Episode 5
Rotax-powered Sling aircraft from The Aircraft Factory, the AVMAP Navigation and engine monitoring system, and the Rotax powered Tucano Experimental and Light-Sport Aircraft.
ROTALK NEWS Episode 4
ROTAX's 915iS-powered Aquila A211 test aircraft, the Scheibe SF-25C Falke (first-ever 912-equipped aircraft!) and ROTAX factory in Gunskirchen, Austria.
ROTALK NEWS Episode 3
Michael Smith's Rotax-Powered Searey Circumnavigation, the amazing Rotax-Powered Lockwood Aircam and Anthony Caere's chimpanzee rescue operations.
This website uses cookies to manage authentication, navigation, and other functions. By using our website, you agree that we can place these types of cookies on your device.
You have declined cookies. This decision can be reversed.
You have allowed cookies to be placed on your computer. This decision can be reversed.
This website uses cookies to manage authentication, navigation, and other functions. By using our website, you agree that we can place these types of cookies on your device.