lml@lancaironline.net Mailing List Archive

<<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> I have an IO360 with the sump modification that moves the fuel servo unit to the front. In this position, the throttle control arm is fairly close to the front cross-over exhaust pipe. What is the best routing for the throttle cable? Should I route the cable below both cross-over pipes with a large arc in the cable to the arm, or is it okay to route the cable between the oil pan and the pipes? The preferred routing seems to me to be the more direct routing between the pipes and the oil pan, but is the close proximity to the oil pan and the exhaust pipes okay if I install heat shields where it crosses the pipes? Thanks. Mike - Wow, did I ever have a problem with this on my fuel injected engine (which should be the same setup as yours), but with some work, you can make it come out nicely!.... First, the only good route for both the throttle and mixture cables is just under the rear exhaust pipes, then under the oil pan. Both must be clamped to their own "L" bracket welded to the oil pan (they will both pass just one inch under the exhaust pipes on each side, but that's no problem). Proceed as follows: With the cables temporarily in place, use a felt tip pen to mark where the "L" brackets should be placed for the clamps which will secure the throttle and mixture cables. This is the ONLY good way to clamp them and the importance of clamping of these cables, especially the throttle cannot be overemphasized. More than one pilot has gotten into SERIOUS trouble when a throttle cable clamp was poorly secured and failed. Yes, you will have to remove the oil pan and return it to Don George so that he can weld two short lengths (approximately 2" each) of heavy aluminum "L" to the bottom of the pan where you have marked. He probably won't charge you anything and will also include a new gasket and sealer. Don't get discouraged, it only takes about 30 minutes to remove the oil pan and one hour to reinstall it! Second, unless they've changed the "Style IV" exhaust pipe routing in the vicinity of the mixture control, it blocks the mixture calbe from it's necessary route. The mixture control arm has "ICO" stamped on it to designate the Idle Cut Off position. I had to remove the exhaust pipes for the #1 and 2 cylinders and send them to Dawley Aviation in Wisconsin to have the #1 pipe cut, bent and rewelded as necessary to clear the mixture cable. I had to return it not once, but three times and I'm surprised that they were able to get it just right at that. They did an excellent job. Cost was $ 200. I called Lancair about this afterwards and I believe they knew of that problem, but hadn't corrected it as of 1996. Good Luck and write with any further questions about the details. Bill Rumburg N403WR (Sonic bOOm) LML website: http://www.olsusa.com/Users/Mkaye/maillist.html Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com.