The heaviest item on the firewall is the battery. This will be an Odyssey PC680. This is a drycell 12 Volt 16 Ah Battery capable of 680 Cranking Amps for 5 Seconds. The advantage of the drycell technology is that there is no acid to spill and the battery can even be installed on it's side if required. The PC680 weighs less than 15 pounds, about 7lbs less than a typical aircraft battery, but still needs proper support to mount on the firewall. Two lengths of 5/8" * 0.028" ID tubing were welded vertically between the firewall diagonal and the top firewall cross member. Four tabs were then welded to the diagonals and drilled to mount the battery case which is the standard Vans case for the PC680. Above these two additional tabs were welded and drilled to mount the master relay and starter relay. Towards the bottom left of the diagonal an additional tab was welded and drilled to 5/8" to take the gascolator firewall mounting. This is a special bulkhead fitting available from ACS designed to mount the gascolator solidly on the firewall. The incoming fuel line is connected to a AN6 male tube fitting on the cabin side. The gascolator is screwed directly onto the 1/4" male pipe thread on the engine side. No other support is needed. The gascolator will be at the lowest point in the fuel system designed to trap any water in the fuel and act as a fuel filter.
The heaviest item on the firewall is the battery. This will be an Odyssey PC680. This is a drycell 12 Volt 16 Ah Battery capable of 680 Cranking Amps for 5 Seconds. The advantage of the drycell technology is that there is no acid to spill and the battery can even be installed on it's side if required. The PC680 weighs less than 15 pounds, about 7lbs less than a typical aircraft battery, but still needs proper support to mount on the firewall. Two lengths of 5/8" * 0.028" ID tubing were welded vertically between the firewall diagonal and the top firewall cross member. Four tabs were then welded to the diagonals and drilled to mount the battery case which is the standard Vans case for the PC680. Above these two additional tabs were welded and drilled to mount the master relay and starter relay. Towards the bottom left of the diagonal an additional tab was welded and drilled to 5/8" to take the gascolator firewall mounting. This is a special bulkhead fitting available from ACS designed to mount the gascolator solidly on the firewall. The incoming fuel line is connected to a AN6 male tube fitting on the cabin side. The gascolator is screwed directly onto the 1/4" male pipe thread on the engine side. No other support is needed. The gascolator will be at the lowest point in the fuel system designed to trap any water in the fuel and act as a fuel filter.