For those of us with O-200's in Zenith airframes, I'm just curious: Did you mount your alternator on the vacuum pump pad or on the accessory case?  And you know why I'm asking....(drive gear).

Views: 162

Reply to This

Replies to This Discussion

On mine - it's on the back of the engine on the accessory case. I have never seen one on the Vaccum Pump pad. 

Carl, on the engine I sold it was on the accessory case.  The gear inside the vacuum pad was left intact in case an additional gear driven alternator was added.

I'd just as soon NOT have to purchase the $800 TCM replacement gear since my existing gear is the old-must-be-replaced version.

I used the B&C SD-8 Alternator mounted on the vacuum pump pad. My continuous electrical load is 3 amps. The battery stays fully charged, even though most of my flights are .5 to 1 hour long, so I am happy with this choice. I did have to fabricate a bump in the Zenair supplied lower cowling to accommodate the Alternator.

Aha! Good to know. I'm ok with fiberglass mods, and have done them in the past on other builds. Still, good to know.  Thanks for the input.


New from Zenith:

Zenith Planes For Sale 

Classified listing for buying or selling your Zenith building or flying related stuff...

Custom Instrument Panels
for your Zenith

Custom instrument panels are now available directly from Zenith Aircraft Company exclusively for Zenith builders and owners. Pre-cut panel, Dynon and Garmin avionics, and more.

Custom Upholstery Kits for your Zenith Aircraft:

Zenith Vinyl Upholstery Kits

Zenith Apparel from EAA:

Zenair Floats

Flying On Your Own Wings:
A Complete Guide to Understanding Light Airplane Design, by Chris Heintz

Builder & Pilot Supplies:

How to videos from

Developed specifically for Zenith builders (by a builder) these videos on DVD are a great help in building your own kit plane by providing practical hands-on construction information. Visit for the latest DVD titles.

Aircraft Insurance:


West Coast USA:

Pro Builder Assistance:


Transition training:

Golden Eagle Aviation

Pianosa Flying Farm

Aircraft Spruce & Specialty for all your building and pilot supplies!

© 2022   Created by Zenith.Aero.   Powered by

Badges  |  Report an Issue  |  Terms of Service