|
-
POSTING RULES

-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|

11-20-2012, 10:01 PM
|
 |
|
|
Join Date: Jul 2009
Location: Wilsonville, OR
Posts: 453
|
|
Firewall Fuel Line Passthru
I've studied the OP-XX drawing which shows the hole spacing for the doubler plate to be fabricated for the firewall fuel line passthru (Horizontal Induction IO-360). I'm not sure I understand it though. One hole in the doubler is supposed to be matched with one of the rivets that is just underneath and right of the starter solenoid. However, if that doubler is supposed to be on the cabin side of the firewall, I don't see how it could be since a stiffener is located in the same place. I also remember reading about some builders recommending moving the hole an inch or two inboard to space it a little farther away from the starter solenoid. Does anyone have any measurements or pictures? Thanks!
__________________
________
Trevor Conroy CFII, MEI
Airbus Pilot
N781TD
RV-7
First Flight - April 12, 2015
Construction Log
|

11-20-2012, 10:15 PM
|
|
|
|
Join Date: Dec 2005
Location: Oliver, B.C. Canada (Okanagan valley)
Posts: 786
|
|
Trevor
If you have your engine mount on hand do a temp install. You'll find that the proposed hole has clearance issues with the mount.
Some have placed this hole a little north of the plan spec.
Regards
__________________
Lorne
RV 7a tip-up
Pre-cover MD-RA Inspected.
Canopy completed. Bonded with Sika-Flex.
Up on her mains, Firewall Fwd and wiring on going.
Last edited by lorne green : 11-21-2012 at 05:46 PM.
|

11-21-2012, 10:13 AM
|
|
|
|
Join Date: Dec 2005
Location: Mahomet, Illinois
Posts: 2,195
|
|
Lorne is spot-on ...
I didn't know that at the time, but came out OK only thru an incredible stroke of luck. My fuel line misses the engine mount at that spot by 1/8"
__________________
Terry Ruprecht
RV-9A Tip-up; IO-320 D2A
S. James cowl/plenum
(Dues paid thru Nov '18)
|

11-21-2012, 01:27 PM
|
|
|
|
Join Date: Jan 2010
Location: Mission Viejo, CA
Posts: 130
|
|
Engine Side
The doubler plate goes on the engine side of the firewall so there is no interference with the rib. However, plan ahead because after I installed mine I had to drill it out and trim the upper left corner a bit to avoid a starter contactor mounting bolt. There is also a potential interference with the throttle cable pass-thru on the lower right corner of the doubler depending on your engine and carb/fuel injection configuration and if you choose to use an eyeball pass-thru. Sorry I can't be more definitive but it depends on your configuration.
John
__________________
John Harrell
RV-7A Tip-up, Aero Sport Power IO-360, Dual PMags, AFP FI, Catto 3-blade, Dual Dynon Skyviews
Flying since August 2014
Mission Viejo, CA
http://www.johnsrv7a.wordpress.com
|

11-21-2012, 02:19 PM
|
 |
|
|
Join Date: May 2006
Location: Boone, Iowa
Posts: 342
|
|
New Product
Perhaps this is a good time to introduce a new product that we are working on. This fitting is courtesy of Aircraft Artist Dave Howe in CA. They come in two sizes, one has 1/4" female NPT threads on both sides (not modeled in photo below), the other has 1/8" female NPT threads in both sides. This allows for any pipe fitting to be used in either side making for some amazing combinations of readily available fittings going through the firewall in restricted spaces. The 1/4"NPT model is 1" long and uses a 7/8" firewall hole. The 1/8"NPT model is 3/4" long and uses a 5/8" hole. The 1/4" version is off the machine and waiting to be anodized, the other we will start next week. I am thinking they will retail in the $20 area.

|

11-21-2012, 02:57 PM
|
 |
|
|
Join Date: Jul 2009
Location: Wilsonville, OR
Posts: 453
|
|
Looks like a neat idea. Are they Steel for use on the firewall?
__________________
________
Trevor Conroy CFII, MEI
Airbus Pilot
N781TD
RV-7
First Flight - April 12, 2015
Construction Log
|

11-21-2012, 03:43 PM
|
 |
|
|
Join Date: Dec 2006
Location: Sumner, WA
Posts: 722
|
|
I'm not looking at any drawings for measurements but here is a picture of what I did. I think I did move the hole a little for better clearance on other's recommendations. I also ended up using a steel 90 instead of the aluminum one shown.
Maybe no help as mine is a 7A.

__________________
Jeff Bloomquist
Sumner, WA
PP-ASEL, IR
RV-7A
Flying
1150 Hours
|

11-21-2012, 05:32 PM
|
 |
|
|
Join Date: Mar 2008
Location: Ramona, CA
Posts: 2,370
|
|
I had to lower mine about 1/2" from the plans to clear the contactor.
You can see here how it is oriented versus the engine mount with plenty of clearance.

|

11-22-2012, 11:33 AM
|
 |
|
|
Join Date: Dec 2011
Location: Kirkland, WA
Posts: 886
|
|
Hmmm... seems like with all the comments here and elsewhere about engine mount clearance issues, one should not drill any holes into the firewall until they have the engine mount on hand and test fitted. :-)
|

11-22-2012, 04:45 PM
|
 |
|
|
Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,692
|
|
Quote:
Originally Posted by grayforge
Hmmm... seems like with all the comments here and elsewhere about engine mount clearance issues, one should not drill any holes into the firewall until they have the engine mount on hand and test fitted. :-)
|
Engine mount definitely yes. Having the engine mount will help you decide where to put the electrical pass throughs that are really up to you.
There are a number of engine combinations and fuel controller/carb positions that affect the pass throughs. I found the documentation for Vans IO-360-M1B to be quite good. I did not use the stock master and starter solenoid (mounted slightly differently) so I did not run into the fuel pass through clearance issue noted in this thread even though I drilled the position per plans.

__________________
Bill Pendergrass
ME/AE '82
RV-7A: Flying since April 15, 2012. 850 hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
Unpainted, polished....kinda'... Eyeballin' vinyl really hard.
Yeah. The boss got a Silhouette Cameo 4 Xmas 2019.
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 12:07 AM.
|