Rotax 912 Build
Posted: Tue Mar 08, 2022 10:43 pm
by 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.
Re: Rotax 912 Build
Posted: Wed Mar 09, 2022 6:24 am
by Skippydiesel
I am in owe of your project. Keep us posted. All the best
Re: Rotax 912 Build
Posted: Wed Mar 09, 2022 8:05 pm
by aschlem77
On the mill.
Re: Rotax 912 Build
Posted: Thu Mar 10, 2022 5:15 pm
by aschlem77
New cam is assembled and ready for the case
Re: Rotax 912 Build
Posted: Wed Mar 23, 2022 6:46 pm
by aschlem77
Through bolt conversion complete and one cylinder fit.
Re: Rotax 912 Build
Posted: Thu Mar 24, 2022 9:39 am
by gcm52
Very interesting! Please keep these photos coming.
Re: Rotax 912 Build
Posted: Thu Mar 24, 2022 6:43 pm
by Murray Parr
What milling machine are you using?
Re: Rotax 912 Build
Posted: Fri Mar 25, 2022 4:52 pm
by aschlem77
Bridgeport J2
Re: Rotax 912 Build
Posted: Sat Mar 26, 2022 10:45 am
by Matt541
Sweet! This is a direction I’ve considered as well. (Insert old school forum eating popcorn emoji…)
Re: Rotax 912 Build
Posted: Tue Apr 19, 2022 9:58 pm
by 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.
Re: Rotax 912 Build
Posted: Sun Mar 12, 2023 7:01 am
by Murray Parr
Any updates on this? Can’t wait to hear how it runs