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Capacitors

 
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hgmckay



Joined: 23 May 2006
Posts: 385

PostPosted: Mon Sep 24, 2018 12:22 pm    Post subject: Capacitors Reply with quote

On the Rotax 912 UL engine wiring diagram one 22,000 UF capacitor at 25V is shown in the circuit. If you cannot find one capacitor of the exact Capacitance, can one larger capacitor be used? Can two 10,000 aluminum electrolytic capacitors connected in parallel at that point in the circuit accomplish the same thing?

Hugh G. McKay III, P.E. Fellow. L.M. ASCE
Senior Consultant
Worldwide Engineering Inc.
4090 North NC Hwy. 16
Denver, NC 28037

Ph. 704-661-8271
Fax 704-483-5466
Email hgmckay(at)bellsouth.net (hgmckay(at)bellsouth.net)
http://www.geo.com (click on Power Division)
Sent from Mail for Windows 10


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John Hauck



Joined: 09 Jan 2006
Posts: 4627
Location: Titus, Alabama (hauck's holler)

PostPosted: Mon Sep 24, 2018 1:11 pm    Post subject: Capacitors Reply with quote

EBay has all kinds of 22,000 mf capacitors.  Here are a few with free shipping.  Super cheap:

https://www.ebay.com/bhp/22000uf-capacitor

John Hauck
Kolb MKIII
Titus, Alabama

From: owner-rotaxengines-list-server(at)matronics.com [mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of Hugh McKay
Sent: Monday, September 24, 2018 3:22 PM
To: Rotax Engines
Subject: Capacitors

On the Rotax 912 UL engine wiring diagram one 22,000 UF capacitor at 25V is shown in the circuit. If you cannot find one capacitor of the exact Capacitance, can one larger capacitor be used? Can two 10,000 aluminum electrolytic capacitors connected in parallel at that point in the circuit accomplish the same thing?

Hugh G. McKay III, P.E. Fellow. L.M. ASCE
Senior Consultant
Worldwide Engineering Inc.
4090 North NC Hwy. 16
Denver, NC 28037

Ph. 704-661-8271
Fax 704-483-5466
Email hgmckay(at)bellsouth.net (hgmckay(at)bellsouth.net)
http://www.geo.com (click on Power Division)
Sent from Mail for Windows 10


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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama
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Roger Lee



Joined: 10 Jan 2006
Posts: 1461
Location: Tucson, Az.

PostPosted: Tue Sep 25, 2018 5:51 am    Post subject: Re: Capacitors Reply with quote

Hi Hugh,

I have 22K caps if you need one.

The 22K is just a Rotax minimum. You can use larger. Rotax now uses 2 x 33K caps in the 912iS engine. The larger caps like 33K, 40K or 50K will work better than the 22K. The larger the cap capacitance the larger the physical size. The small cap like the 22K usually needs to have ends soldered on while the bigger caps have screw on terminals.


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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
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Roger Lee



Joined: 10 Jan 2006
Posts: 1461
Location: Tucson, Az.

PostPosted: Tue Sep 25, 2018 5:52 am    Post subject: Re: Capacitors Reply with quote

Hi Hugh,

I have 22K caps if you need one.

The 22K is just a Rotax minimum. You can use larger. Rotax now uses 2 x 33K caps in the 912iS engine. The larger caps like 33K, 40K or 50K will work better than the 22K. The larger the cap capacitance the larger the physical size. The small cap like the 22K usually needs to have ends soldered on while the bigger caps have screw on terminals. Get the 105c temp rated ones.


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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
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johnelling



Joined: 23 Feb 2013
Posts: 18

PostPosted: Tue Sep 25, 2018 1:20 pm    Post subject: Capacitors Reply with quote

Keep in mind that capacitors have a limited lifetime.  The electrolites
dry out.  It is a real limit at high altitudes and dry climates.

I get mine from digikey and go for the name brands.

Y'all might look over your capacitors at the next annual.  Good ones
have dates on them and you can find the recommended lifetimes.


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blumax008(at)aol.com
Guest





PostPosted: Wed Sep 26, 2018 7:38 am    Post subject: Capacitors Reply with quote

Totally agree!
Ebay is a great place to shop for 2 and 4 cycle parts. Some people complain about Ebay but I've never had trouble in years of using it & have saved a ton of money!
The prices from retailers are rediculous!
Sent from my Verizon, Samsung Galaxy Tablet

<![endif]--> <![endif]-->-------- Original message --------
From: John Hauck <jhauck(at)elmore.rr.com>
Date: 9/24/18 5:11 PM (GMT-05:00)
To: rotaxengines-list(at)matronics.com
Subject: RE: RotaxEngines-List: Capacitors


EBay has all kinds of 22,000 mf capacitors. Here are a few with free shipping. Super cheap:

https://www.ebay.com/bhp/22000uf-capacitor

John Hauck
Kolb MKIII
Titus, Alabama

From: owner-rotaxengines-list-server(at)matronics.com [mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of Hugh McKay
Sent: Monday, September 24, 2018 3:22 PM
To: Rotax Engines
Subject: RotaxEngines-List: Capacitors

On the Rotax 912 UL engine wiring diagram one 22,000 UF capacitor at 25V is shown in the circuit. If you cannot find one capacitor of the exact Capacitance, can one larger capacitor be used? Can two 10,000 aluminum electrolytic capacitors connected in parallel at that point in the circuit accomplish the same thing?

Hugh G. McKay III, P.E. Fellow. L.M. ASCE
Senior Consultant
Worldwide Engineering Inc.
4090 North NC Hwy. 16
Denver, NC 28037

Ph. 704-661-8271
Fax 704-483-5466
Email hgmckay(at)bellsouth.net (hgmckay(at)bellsouth.net)
http://www.geo.com (click on Power Division)
Sent from Mail for Windows 10


- The Matronics RotaxEngines-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?RotaxEngines-List
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