lml@lancaironline.net Mailing List Archive

David,

On our IV-P's Jim White and I used a procedure that worked like a champ, and might help you "do it right" the first time. We made a "template" of the firewall out of 1/4" plexiglass and used it to "pre-locate" everything. After cutting it to the shape of your firewall (we made ours fit inside the cowling flange), we drilled it for the motor mount holes, and other already-positioned items (e.g. the gascolator and battery box for us). It's a good idea to mark any obstructions on the cabin side of the firewall with a marker so you don't try to through-bolt something into a stiffner or similar item on the back side of the firewall/inside the cabin. We then bolted the motor mount to the engine and the plastic template to the motor mount. This gives you a readily accessible form for installing and fitting all components. You can locate and mount the parts without an assistant, and can even see what you're doing most of the time. When you have a place for everything, and everything in it's place, carefully remove it all from the template, transfer the template to the front of the firewall (be sure to keep it properly oriented front to back) and drill and reinforce your holes. Then bolt the parts to the firewall. The results were well worth the trouble--no extra holes/patches in the firewall or covering fire blanket.

Good luck!

Bob Pastusek

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net]On Behalf Of David Lowry
Sent: Sunday, March 20, 2005 2:29 PM
To: Lancair Mailing List
Subject: [LML] Locating firewall components on Legacy

All,

The Legacy comes with a blueprint for locating

holes in the firewall. I would like to mount some of these

parts but I don't have the engine yet (ordered but not here).

I am reluctant to proceed as I have found many of

Lancairs hole locations completely bogus and subsequnetly

changed on the next manual.

Any experience would be appreciated along with the drawing

revision (if any) you used.

I will be installing the Continental engine with a B&C backup

alternator on the rear pads.

David Lowry