172A Generator to Alternator Upgrade

172A Generator to Alternator Upgrade

What are the pros/cons, if any, to changing out a generator on an older airplane for an alternator system? Any idea of the cost involved?  Thanks, BJ

Guest
Guest
useravatar
Offline
Posts
User info in posts
Only registered users or members can reply or post

Re: 172A Generator to Alternator Upgrade

Pros: Much greater charging capacity at low engine RPMs (e.g. long, slow descent at night with throttle pulled back and all radios, lights, instruments, and other electrical loads on), greater reliability, typically higher output current rating than generator.

Cons: If battery is completely flat and there isn't enough voltage to energize the alternator field, even if you hand prop to get your engine started, the alternator won't charge your battery, so you'll be without radios, lights, and other electrical accessories. If you have a dead battery, it's best to remove it and bench charge it if you have an alternator.

The Jasco alternator conversion kit is about $750 from <http://www.aircraftspruce.com/catalog/eppages/jascoaltkit.php>. Count on about six to eight hours labor. 

Guest
Guest
useravatar
Offline
Posts
User info in posts
Only registered users or members can reply or post

Re: 172A Generator to Alternator Upgrade

Thanks for the info Stan ... BJ

Guest
Guest
useravatar
Offline
Posts
User info in posts
Only registered users or members can reply or post

Re: 172A Generator to Alternator Upgrade

You're welcome. I replaced the DC generator with a Skytronics Jasco alternator conversion kit in my 172D four years ago, and it's been totally reliable. I'd do it again in a heartbeat.

There are good reasons why all the automobile and airplane manufacturers changed from generators to alternators in the mid- to late-sixties.

Guest
Guest
useravatar
Offline
Posts
User info in posts
Only registered users or members can reply or post

Re: 172A Generator to Alternator Upgrade

Thanks again ... I found the Spruce listing. Probably do it at my next annual.  BJ

Guest
Guest
useravatar
Offline
Posts
User info in posts
Only registered users or members can reply or post

Re: 172A Generator to Alternator Upgrade

Guest
Guest
useravatar
Offline
Posts
User info in posts
Only registered users or members can reply or post

Re: 172A Generator to Alternator Upgrade

I just completed my conversion.  The Alternator works great, but I have lost one radio, while in flight.  It is a King KX-155.  It is probably do to noise created by the Alternator.  It is a gear driven Skytronics.

Guest
Guest
useravatar
Offline
Posts
User info in posts
Only registered users or members can reply or post

Re: 172A Generator to Alternator Upgrade

We upgraded our tired old Delco generator on the O-300 to a Lightweight alternator (dynamo) STC using the 6.1 pound lightweight B & C unit (STC by Endowment Enterprises 480-650-0883.  It produces 30 amps, and requires no battery voltage to charge and regulate since it is self-excited.   After a load analysis on the airplane we found that we only needed about 20 Amps, so this was a great lightweight choice for our 172.   We have a friend with a C-150 (O-200) who is also looking to do it.    The kit comes complete with all switches, wiring, circuit breakers, gaskets, warning lights and detailed instructions.  Great upgrade- supposed to be 2000 hours between service intervals, and uses the standard Continental drive gears from the Old generator / alternator.

Guest
Guest
useravatar
Offline
Posts
User info in posts
Only registered users or members can reply or post

Board Info

Board Stats:
 
Total Topics:
6026
Total Polls:
1
Total Posts:
16346
Total Posts Today:
1
User Info:
 
Total Users:
2400
Newest User:
Rsterlin
Members Online:
2
Guests Online:
1926


Forum Legend:

 Topic
 New
 Locked
 Sticky
 Active
 New/Active
 New/Locked
 New Sticky
 Locked/Active
 Active/Sticky
 Sticky/Locked
 Sticky/Active/Locked

ankara escort ankara rus escort ankara escort bayan ankara bayan partner ankara escort kizlar escort ankara ankara escort ankara eskort ankara escort bayan ankara bayan partner ankara escort kizlar escort ankara