Where to put the ground on the engine case?

[claycookiemonster]

Nobody mentions this. Lots of chat about where to put the ground on the airframe. So, either it's a secret, or it can go anywhere?

Also, on painted engine cases, remove the surface paint, or trust the bolt to catch the metal inside?

 

[Desert Rat]

remove the paint around the footprint of the lug.

As far as where to put it, an angle valve has a hole for a thru bolt just for this purpose that you wouldn't find in a million years if you didn't know it was there. It's just aft of the base of the oil filler tube. Can't say I recall if that same setup is on the parallel valve engines or not. Hopefully somebody else will chime in.

 

[rmarshall234]

Always remove the paint for a proper ground. Those drill driven bonding brushes ( think that’s what they are called ) make it easy peasy

 

[Carl Froehlich]

The starter draws the most current. I alway us the nice, clean and shiny ground lug on the starter for engine ground.

I really do not like a ground strap going to a greasy engine bolt - or the RV-14 version of ground via the engine mount.

Carl

 

[Foghorn]

The parallel valve engine have a grounding lug on each side just below the upper engine mount. I think it’s sized for an AN4 bolt. I did two grounds since I’m electronically powered. One goes from the starter lug to the firewall where it meets the battery ground and the other is from a ground lug to the engine mount at the firewall. No issues so far.

 

[climberrn]

After removing paint, I used an internal star washer on the engine ground.

 

[wirejock]

Ground hole

After removing paint, I used an internal star washer on the engine ground.

What they ^ said. The hole mentioned is on the parallel valve as well. Right by the oil filler. 1/4". Great spot for a main ground.

 

[rv8ch]

I put mine up high where I can see and feel them easily. Braided ground strap with some split loom tubing to avoid chafing.

http://www.rv8.ch/ground-point-on-firewall/