Firewall Penetrations: Need help identifying

[kirkbauer]

The firewall is a place where there can be a bit of customization and I'm at that stage. Unfortunately, even after reading through the Firewall-Forward instructions there are a lot of standard passthrough holes and nutplates that I can't figure out what the original intent is for them. I'd like to figure that out before I proceed with any modifications.

Please review the image below and let me know if I have anything marked incorrectly. If you know what an item marked with a question mark is for, please let me know. I will update this and post it here as well as on the RV-10 Community Wiki so it can help other builders.

NOTE: this image is from Section 27 Firewall and is from the perspective of the cold side (inside the aircraft).

 

[Halleffect]

4 and 1 are probably the brake fluid reservoir.

 

[Pdp7427]

The firewall is a place where there can be a bit of customization and I'm at that stage. Unfortunately, even after reading through the Firewall-Forward instructions there are a lot of standard passthrough holes and nutplates that I can't figure out what the original intent is for them. I'd like to figure that out before I proceed with any modifications.

Please review the image below and let me know if I have anything marked incorrectly. If you know what an item marked with a question mark is for, please let me know. I will update this and post it here as well as on the RV-10 Community Wiki so it can help other builders.

NOTE: this image is from Section 27 Firewall and is from the perspective of the cold side (inside the aircraft).

View attachment 78311

I think #2 cabin heat cables.

 

[gkochers]

I think #2 cabin heat cables.

Previous responses are correct.

3 is the fuel supply throughs the firewall
5 & 7 are for adel clamps that support fuel lines
6 is an adel clamp for heater cable support
You probably won’t need that manifold pressure pass through if you’re using a digital EIS. Install a pressure transducer on the VA-168 sender.

You will want to plan ahead additional mounting locations for fuses, shunts, and other electrical equipment before you close up the forward cabin. You probably have some time, but all of that will be very specific to your airplanes electrical design. Most will typically have addition large penetrations for wiring throughs the firewall in addition to the penetration provided.

 

[kirkbauer]

Awesome, thanks everybody for the replies -- we have them all identified and the new image is pasted below. There is a lot to figure out and I'd like to do most of it well before the engine is attached so it can be tricky. So far I have modified the electrical and manifold passthroughs at the top corners for battery and low-voltage passthroughs.