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  #1  
Old 05-15-2019, 02:27 PM
Draker's Avatar
Draker Draker is offline
 
Join Date: Jun 2016
Location: Livermore, CA
Posts: 276
Default Firewall-forward thoughts while working on fuselage?

Two somewhat-related questions for all-knowing VAF!

1. Reading some past threads, it seems there is some wisdom to having the engine mount available and test fit well before starting FWF, in order to double check the location and fit of components you plan to attach to the engine side of the firewall (e.g. the brake fluid reservoir), and in general to start planning the firewall-forward side. I'm going nose-dragger but have still not finalized my engine choice. Between the IO-360-M1B (180hp) and IO-360-A1B6 (200hp), is the engine mount the same? If so, I don't see why I wouldn't want to order it early, before whatever kit it actually comes with.

2. For fuel injected engine, the fuel line passes through the firewall on the lower center-right area, with a metal doubler on the engine side. In some threads, builders using Van's documented location for this hole have reported interference between the doubler and the starter contactor, and also clearance issues with the engine mount. Is there a consensus on the best location for this pass-through hole? Without the mount and starter hardware, I have little confidence I'm drilling in the right spot. Should I just hold off and not pass the fuel line through the firewall until much later in the build?
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Ryan Drake
Livermore, CA
https://stiletto.smugmug.com/RV7
Donated 1/2/2019
RV-7A: Empennage and wing kits complete minus fiberglass, fuselage in progress!
N12VD reserved!
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  #2  
Old 05-15-2019, 04:19 PM
David Paule David Paule is offline
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 3,922
Default

While I'm not building one of the side-by-side models, I know that some of the drawings are available on the $10 thumb drive plans. Look for the OP drawings. They cover at least some aspects of what you need.

There's this to be said for settling on an engine: it lets you get the finish kit and the FWF kit, if there is one for your plane.

Dave
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  #3  
Old 05-15-2019, 08:34 PM
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sahrens sahrens is offline
 
Join Date: Jan 2007
Location: Northern CA
Posts: 450
Default wait

Someone advised me to wait to drill holes in the firewall until the engine was mounted, that way I could see the conflicts. I decided not to wait and regretted it.

If you can, wait.
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RV-7 N818BG (flying)
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  #4  
Old 05-15-2019, 10:39 PM
rapid_ascent rapid_ascent is offline
 
Join Date: Mar 2008
Location: Dublin, CA
Posts: 1,058
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Ryan,

Iíve already drilled my firewall for the fuel line for a fuel injected engine and I put on the starter contactor. There was an issue that I worked through where I had to make an adjustment. I shifted things around slightly and at at this point I think it worked out. Only time will tell for sure though.

Ray
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2018 Donation Paid
Titan IOX-370 on order
RV-7 Fuselage in progress
* Cabin Interior - In progress
RV-7 SB Wings
* Both Wings fully skinned
* Fuel Tanks Complete - No leaks finally
* Ailerons Complete
* Flaps Complete
RV-7 Empennage - Complete (a little fiberglass work left)
Vans Training Kit # 2 - Complete
Shop Setup - In Progress (Gathering Tools, Never Complete)
RV-7 Preview Plans
Vans Training Kit #1 - Complete
EAA Sheet Metal Class - Complete
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  #5  
Old 05-16-2019, 04:39 AM
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Larry DeCamp Larry DeCamp is offline
 
Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 840
Default This is a no brainer

With the engine mounted, you will see many conflicts in wires , hose, cable and scat potential routing. Stainless patches are not good for your ego or resale. Yes, some holes will be impossible to drill with mount in place so take it off to drill.
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RV-3B flying w/ carb / Pmags / Catto 2b / Steam
RV-4 fastback w/ Superior XP360/AFP/G3X/CPI/Catto3b
Clinton, IN
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  #6  
Old 05-16-2019, 05:44 AM
RV74ME RV74ME is offline
 
Join Date: Dec 2015
Location: Auburn, AL
Posts: 138
Default

I, too drilled all the holes in firewall before engine mount was installed. And yes, my fuel line (injected) is very close to the starter contacter. It will work, but thatís one I would do differently.

Also drilled the hole for manifold pressure (per plans). Regret that one as well, since the MP line will wont need to penetrate the firewall.

The hole for air filter bypass (alt air) is so close to part of the engine mount, I would hold off on that too.

Everything else seems to be pretty good.
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N922WT (reserved)
KAUO (Auburn, AL)

RV-7 slow build
Tail kit COMPLETE
Wing kit COMPLETE
Fuselage kit COMPLETE
FWF COMPLETE
Wiring IN PROGRESS
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  #7  
Old 05-16-2019, 09:38 AM
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Draker Draker is offline
 
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Location: Livermore, CA
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Thanks for sharing. It seems so far the consensus leans toward "waiting" to drill major firewall pass-throughs. I confirmed the answer to my first question directly with Vans. If I wanted to buy the engine mount early, the part number for the -7A is WD-739-PC and it's the same for both the IO-360 180hp and 200hp engines.
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Livermore, CA
https://stiletto.smugmug.com/RV7
Donated 1/2/2019
RV-7A: Empennage and wing kits complete minus fiberglass, fuselage in progress!
N12VD reserved!
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  #8  
Old 05-16-2019, 07:09 PM
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jcarne jcarne is offline
 
Join Date: Jul 2016
Location: Worland, Wyoming
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Quote:
Originally Posted by Draker View Post
Thanks for sharing. It seems so far the consensus leans toward "waiting" to drill major firewall pass-throughs. I confirmed the answer to my first question directly with Vans. If I wanted to buy the engine mount early, the part number for the -7A is WD-739-PC and it's the same for both the IO-360 180hp and 200hp engines.
The only downside to that is the mount is not a small part, shipping it would be pricey.
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RV-7A Emp. done
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  #9  
Old 05-16-2019, 07:23 PM
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Larry DeCamp Larry DeCamp is offline
 
Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 840
Default The mount is not the whole story !

Trust me Ryan, beyond the mount is FI vs Carb, Mag vs EI vs Pmag vs Efii,etc. Cold sump vs Lyc, cooler on baffle vs. firwall, on and on. If you dont have your engine, you will have some hindsight regrets.
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RV-3B flying w/ carb / Pmags / Catto 2b / Steam
RV-4 fastback w/ Superior XP360/AFP/G3X/CPI/Catto3b
Clinton, IN
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  #10  
Old 05-17-2019, 06:50 AM
rapid_ascent rapid_ascent is offline
 
Join Date: Mar 2008
Location: Dublin, CA
Posts: 1,058
Default

Vans had the motor mounts on backorder until recently. They shipped mine separately from my finishing kit with the front gear leg. Shipping weight 44 lbs. They paid the freight in this case but you can figure it out if your interested.
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Ray Tonks
2018 Donation Paid
Titan IOX-370 on order
RV-7 Fuselage in progress
* Cabin Interior - In progress
RV-7 SB Wings
* Both Wings fully skinned
* Fuel Tanks Complete - No leaks finally
* Ailerons Complete
* Flaps Complete
RV-7 Empennage - Complete (a little fiberglass work left)
Vans Training Kit # 2 - Complete
Shop Setup - In Progress (Gathering Tools, Never Complete)
RV-7 Preview Plans
Vans Training Kit #1 - Complete
EAA Sheet Metal Class - Complete
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