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  #11  
Old 05-17-2019, 07:05 AM
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N941WR N941WR is offline
 
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Use the advanced search function and use my user name (N941WR). Some time back I posted all the firewall penetrations called out in the plans.

Some are best done early but don't show up in the plans until after the engine is hung
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  #12  
Old 05-20-2019, 03:15 AM
Vansrv7arob Vansrv7arob is offline
 
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Even if I was very confident I knew where to drill the holes without the final engine on I would only drill them as max #30 pilot holes. If when the engine is on they are indeed in the right place enlarge. If not it's only a #4 rivet to fill the hole rather than a patch. I still have holes to drill to locate some pass throughs and FW parts. The only holes I drilled before the engine was on was the holes to attach the engine mount itself. All my stainless holes start as #40 the pilot hole is the hardest to get through after that step drill and or final drill size easily enlarges the pilot when your certain. The side benefit is that you can use cleccos to easily hold components on to confirm any interferences. But lots of my stuff is non-standard/oddball FWF, (standard aviation) but so far off the Vans reservation no idea anymore what a standard Vans plans build is like following their instructions.
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  #13  
Old 05-20-2019, 06:58 AM
TS Flightlines TS Flightlines is offline
 
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Ryan, prior planning always helps. But those plans can change, and often do. Especially locations for accessories. Think about what you want--check the plans, and pics of others with similar equipment. Think some more, measure about 3 times. Prior planning certainly will save you a bunch of potential headaches later.

Tom
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  #14  
Old 05-20-2019, 08:49 AM
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Draker Draker is offline
 
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Indeed! After drawing these items onto the firewall with a sharpie, it's obvious that there will be a conflict between the fuel line doubler and the starter solenoid's bracket:



I'll either move the fuel line hole down a hair or grind off the corner of the doubler. It doesn't look like this will make any difference whatsoever because there's a flexible hose on the engine side.

This exercise has convinced me not to drill anything until I at least have all the things that attach to the firewall in my possession. I'll also be sketching out Vans entire plan onto the firewall as a way to familiarize myself with what's on this side earlier and plan ahead.

And, related to planning ahead: Not sure how I'm going to dimple the new hole that's needed for nutplate that the starter solenoid's bolt goes through. The firewall is already riveted to the vertical stiffener angle. I may just have to end up countersinking through the thin firewall.
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  #15  
Old 05-20-2019, 10:17 AM
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Raymo Raymo is offline
 
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There are a couple options for dimpling those types of holes. One is to countersink a metal block, place the block on the back side and use a rivet and rivet gun to do the work. Another is a kit you can purchase with small dies and a nail that you pull with a hand squeezer rivet gun.

For what its worth, I did not rivet the backing plate for the master and starter relays. The bolts hold it in place just fine.

My fuel line is much lower than the plans; maybe 3 inches above the lower side of the FW.
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  #16  
Old 05-20-2019, 10:31 AM
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Draker Draker is offline
 
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Ray, I'm not too worried about dimpling through only the firewall--I do have tools for that. What I'm puzzled about is dimpling the firewall where there is already an aluminum stiffener behind it. Normally I'd countersink the stiffener, and then dimple the sheet, but in this case, the stiffener has long ago been riveted to the sheet!
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  #17  
Old 05-20-2019, 01:55 PM
rapid_ascent rapid_ascent is offline
 
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Ryan,

I sent you an email with an earlier pic which shows the situation before I resolved it.
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  #18  
Old Yesterday, 05:45 AM
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Raymo Raymo is offline
 
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Quote:
Originally Posted by Draker View Post
Ray, I'm not too worried about dimpling through only the firewall--I do have tools for that. What I'm puzzled about is dimpling the firewall where there is already an aluminum stiffener behind it. Normally I'd countersink the stiffener, and then dimple the sheet, but in this case, the stiffener has long ago been riveted to the sheet!
If you re-use an existing rivet hole, that should be covered. I don't recall having to install/countersink any other holes in the FW where a stiffener backed the hole.
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RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines

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