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Difference between B&C Starter Contactors?

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david(at)carter.net
Guest

Posted: Thu Sep 17, 2020 8:25 am Post subject: Difference between B&C Starter Contactors?

Anyone know if there is any practical differenceÂ between the S702-1 & the S811-1, besides $10.00?Â  I'm redoing the electricalÂ system in my RV-7A (I'm not the builder) per Z101, and want to replace the existing contactors, which I believeÂ are the ones Vans sells. The form factor on the B&C starter contactors is different, which will make it slightly more complicated to retrofit. Is it worth the effort?Â 

Thanks,

David

---

David Carter

david(at)carter.net (david(at)carter.net)

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user9253

Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan

Posted: Thu Sep 17, 2020 8:55 am Post subject: Re: Difference between B&C Starter Contactors?

The $10 might pay for the PMA.

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_________________
Joe Gores

jluckey(at)pacbell.net
Guest

Posted: Thu Sep 17, 2020 9:21 am Post subject: Difference between B&C Starter Contactors?

Hi David,

It is my understanding that the S702-1 (sometimes called a "pancake" solenoid) is a solenoid that has been optimized for cranking duty.  I believe that Ford created the design some time in the 70s specifically to start engines in Ford vehicles.  Things like contact size and contact pressure were optimized for the specific task of short-duration high-current loads encountered when starting engines.  I believe that this makes the design less likely to be a victim of the "weld shut" scenario that we occasionally hear about with older tin-can types.   Based on this info I have decided to use it in my RV-7 and in a friend's RV-14.

The other "tin can" configuration is a more general-purpose solenoid.  It seems to work fine as it is in thousands of little GA aircraft.

Some advantages of the S702-1:

1. Optimized for the task of starting

2. Ubiquitous - is in millions of Ford cars & trucks - you can get one at almost any auto parts store (even in PoDunk North Dakota)

3. Cost effective





Jeff Luckey





                  

                                                                    On Thursday, September 17, 2020, 09:47:32 AM PDT, David Carter <david(at)carter.net> wrote:                 

                 



                 



                 Anyone know if there is any practical difference between the S702-1 & the S811-1, besides $10.00?  I'm redoing the electrical system in my RV-7A (I'm not the builder) per Z101, and want to replace the existing contactors, which I believe are the ones Vans sells. The form factor on the B&C starter contactors is different, which will make it slightly more complicated to retrofit. Is it worth the effort? 

Thanks,

David

---

David Carter

david(at)carter.net (david(at)carter.net)

- The Matronics AeroElectric-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:

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