Matronics Email Lists Forum Index Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
 
 Get Email Distribution Too!Get Email Distribution Too!    FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Engine grounds

 
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> AeroElectric-List
View previous topic :: View next topic  
Author Message
sjhdcl(at)kingston.net
Guest





PostPosted: Thu Jun 22, 2006 3:37 am    Post subject: Engine grounds Reply with quote

If I get continuity between my ground block and all unpainted parts of the
engine, do I still need to run 2 ground wires specifically for the engine?

Steve
RV7A


- 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:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
dennis.glaeser(at)eds.com
Guest





PostPosted: Thu Jun 22, 2006 4:40 am    Post subject: Engine grounds Reply with quote

Steve,

Just getting continuity doesn't mean it will handle the amperage
required - especially for starting. My son (also building a 7A) tried
cranking his engine before installing his grounds, and it barely turned
over. Once he installed the grounds, it spun like a top. Also, without
dedicated grounding, your engine instrumentation could potentially be
intermittent or inaccurate, and difficult to diagnose.

Dennis Glaeser
RV7A Fuselage


If I get continuity between my ground block and all unpainted parts of
the
engine, do I still need to run 2 ground wires specifically for the
engine?

Steve
RV7A


- 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:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
frank.hinde(at)hp.com
Guest





PostPosted: Thu Jun 22, 2006 6:05 am    Post subject: Engine grounds Reply with quote

Yes but only one not two...You need a strap between the block and the
grounding point on the firewall.

Apart from potential (electrical joke ...get it..Smile..) of ground loops
making noise on your radios, there is a smal risk of sending high
current though unpleasant places...Like bearings in your engine. It is
possible to arc weld your bearings to the crank!

Needless to say this is not good!

Even though your meter may say you have continuity its really not
sensitive enough for the low volts/high current situation of when you
engage the starter.

A short length of #2 welding cable (nice and flexible) is all that is
required.

Frank

--


- 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:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
Hopperdhh(at)aol.com
Guest





PostPosted: Thu Jun 22, 2006 7:25 am    Post subject: Engine grounds Reply with quote

Steve,

I couldn't agree more. Just imagine putting the starter current through
your throttle and mixture cables! That voltage had to be dropped somewhere.
The second ground is to prevent this just in case the first one opens up for
any reason.

Dan Hopper
RV-7A


In a message dated 6/22/2006 8:42:57 A.M. Eastern Daylight Time,
dennis.glaeser(at)eds.com writes:


<dennis.glaeser(at)eds.com>

Steve,

Just getting continuity doesn't mean it will handle the amperage
required - especially for starting. My son (also building a 7A) tried
cranking his engine before installing his grounds, and it barely turned
over. Once he installed the grounds, it spun like a top. Also, without
dedicated grounding, your engine instrumentation could potentially be
intermittent or inaccurate, and difficult to diagnose.

Dennis Glaeser
RV7A Fuselage


If I get continuity between my ground block and all unpainted parts of
the
engine, do I still need to run 2 ground wires specifically for the
engine?

Steve
RV7A


- 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:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
Display posts from previous:   
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> AeroElectric-List All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group