ORIGINAL: raglafart
Hi Bob
What was the difference between the Mk I and Mk II. Was it just the modified crankcase with extra meat around the rear bearing and change in venturi? Were there any other differences?
Cheers John
John,
Just in case Phil is watching, let me say from the outset that an Olly Major looks nothing like a Taipan marine engine. Apart from the very un-Olly looking venturi that you mentioned, the only thing I know is that the Mk. 2 is supposed to have a longer piston skirt to eliminate sub-piston induction, as well as better counterbalancing on the crank, which (after reading the Engine Test of the Mk. 1) is probably a good thing. If you want to see the one I bought, its eBay item #270418466827. I wonder if the fact that the Rivers Silver Arrow had roller bearings contributed in any way to its smoothness ? Does the prefix "M" before the Serial # signify that the engine is Factory Modified ? I thought that Ollys had the Serial # on the L.H. lug, and M and HC (chromed bore) stamped on the R.H. lug. BOB