Rotax 912 Build

[aschlem77]

I'm building a Big bore Zipper engine. The parts are purchased from zipperbigbore.com, Jay and Hal have been great to work with. Im doing the 1622cc kit with the HP cam shaft and a through bolt kit for the case. This should yield 130hp. Plans are to add SDS or Edge fuel injection to complete the package. This project started with a 1000hr mid 2000's 912UL. Additionally i will add the slipper clutch to the gear box and the HD starter. The engine is down to the case. I have already disassembled, cleaned, inspected the heads and lapped the valves, time to move on the the machining of the case and heads to receive the larger cylinders.

[Skippydiesel]

I am in owe of your project. Keep us posted. All the best

[aschlem77]

On the mill.

[aschlem77]

New cam is assembled and ready for the case

[aschlem77]

Through bolt conversion complete and one cylinder fit.

[gcm52]

Very interesting! Please keep these photos coming.

[Murray Parr]

What milling machine are you using?

[aschlem77]

Bridgeport J2

[Matt541]

Sweet! This is a direction I've considered as well. (Insert old school forum eating popcorn emoji..)

[aschlem77]

New pictures coming soon. Took a few weeks off. Here is one of me preparing to modifying a c-bore to fit the through holes I machined in the block. Had to remove .007 from the diameter of the pilot.