914 cylinders on 912uls

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

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.

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.

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