Wires through the firewall

[tonyjohnson]

Vans drawings calls for a 5/8 hole in the firewall through which the electical wiring will pass. That seems a little small to me. I am putting together a list of the wires that will need to pass through my firewall in order to determine the propery size of the hole.

So far I have:

Starter/battery cable...2awg
cht x 4
egt x 4
tach
alt field
alt output
alt warning
manifold pressure
emag
pmag
fuel flow transducer
oil pressure
oil temp
hobbs


Am I missing anything? For those of you with similar setups, what size hole did you need? Any other advice about the size or positon of the holes would be appreciated.

[Norman CYYJ]

Put the holes where You want them and the size You want. Just seal them well.

[az_gila]

Originally Posted by Norman CYYJ

Put the holes where You want them and the size You want. Just seal them well.

Actually, put them near the outer mounting bolts... then the wires can be dressed nicely along the tubes of the motor mount to wherever they have to go....

gil in Tucson

[PaigeHoffart]

OP-35 shows some suggested locations, although I didn't locate my battery cable right next to the fuel line as suggested. I'm using two 5/8" holes. The battery cable has its own and the alternator output will be tied into the battery cable with a current limiter.

Paige
RV-8A