stunthanger.com
Engine basics => Engine set up tips => Topic started by: David Ruff on February 11, 2018, 09:59:55 AM
-
I just put a new LA 46 together. I have the gasket set and I just added the new head gasket to the existing gasket.
Will it run?
I hear about adding gaskets to lower compression?
I have not run it yet.
(https://i.imgur.com/AcbwK9uh.jpg)
(https://i.imgur.com/JJS3Bguh.jpg)
-
One head gasket, leave it stock . Those O.S. Head gaskets are thick . See the LA .46 set up guide above .
Brad
-
Thanks. I went back to one head gasket. Appreciate the info. I was reading all the .46 setups and did not see any shimming.
And I just fired her up on the stand. Running like a champ. Easy 4 stroke run. Very even and smooth. First run of two minutes. I guess I did not mess the engine up.
-
Thanks. I went back to one head gasket. Appreciate the info. I was reading all the .46 setups and did not see any shimming.
And I just fired her up on the stand. Running like a champ. Easy 4 stroke run. Very even and smooth. First run of two minutes. I guess I did not mess the engine up.
You're not actually going to run that prop for flight, are you? That looks like about a 10-6 or 11-6, think 11.5-4 and a two-stroke.
Brett
-
You're not actually going to run that prop for flight, are you? That looks like about a 10-6 or 11-6, think 11.5-4 and a two-stroke.
Brett
It is 11-7 and just for break in.
Sent from my SAMSUNG-SM-G930A using Tapatalk
-
It is 11-7 and just for break in.
Sent from my SAMSUNG-SM-G930A using Tapatalk
You don't want that much pitch for break in, or that much diameter either really. Find an old 10-5 or 11-4 or 5 for break in. You don't want to over load the engine with excess pitch. It's got extra load just from being run on a the bench and not being able to unload by getting airborne. You probably haven't hurt anything at this point, but proceed with less diameter and pitch. I was taught to break any engine in with a normal load and normal operating temperature, whether it be a car, motorcycle, model airplane engine, whatever. Using a 11-7 prop will not make a normal load. A sort of general rule of thumb I have always followed is an inch less diameter than what will normally be used, and an inch or so less pitch.
Good luck and have fun,
Dan McEntee
-
David the TT 11 x 4.5 are very good props to break in and also fly the OS 46, That motor will not need much breakin time, but you will not hurt anything doing a breakin . Try to keep it just between a 4/2 cycle when doing your breakin, or the fastest 4 stroke it will run in, them turn the needle in until it hit s a 2 stroke, rich 2 stroke, cycle between the 2, do not let it get very lean, and do not run sloppy rich, I recommend you use no less than 22% oil on your breain
Randy
-
Do the LA46 and the LA40 have the same external dimensions? I am building a 660sq" profile for an 46FX and it is coming out light. It will be be around 50oz with engine, muffler and no fuel and I am concerned that the FX will over power it. I do have an old worn out LA40 I could I use that to (re)finish the nose then drop in a LA46?
Do any of you have actual experience running an FX? If it will run steady at a fast 4 I may not need the LA. I hate doing reconstructive surgery on a plane that hasn't even flown yet!
Sorry for the barrage of, what must appear to be "duh" questions to those of you who lived through the technology transition. I skipped that one. All of these engine options and adjustable everything are new to me so please be patient, I learn fast and I don't ask unless I can't find the answer through a search.
One more - how much wear can be tolerated in the connecting rod in the newer engines? I have had engines that ran fine with as much as 2" prop movement with the piston top dead center. That was then, is it the same now?
Thanks - Ken
-
Do the LA46 and the LA40 have the same external dimensions? I am building a 660sq" profile for an 46FX and it is coming out light. It will be be around 50oz with engine, muffler and no fuel and I am concerned that the FX will over power it. I do have an old worn out LA40 I could I use that to (re)finish the nose then drop in a LA46?
Do any of you have actual experience running an FX? If it will run steady at a fast 4 I may not need the LA. I hate doing reconstructive surgery on a plane that hasn't even flown yet!
Sorry for the barrage of, what must appear to be "duh" questions to those of you who lived through the technology transition. I skipped that one. All of these engine options and adjustable everything are new to me so please be patient, I learn fast and I don't ask unless I can't find the answer through a search.
One more - how much wear can be tolerated in the connecting rod in the newer engines? I have had engines that ran fine with as much as 2" prop movement with the piston top dead center. That was then, is it the same now?
Thanks - Ken
Hi Ken
The 40 and 46 LA have the same dimensions outside, The 46 will pull that plane easy, if you need a rod or parts for 46 LA I have them here
there is a big difference in weight between the 2 OS 46 engines
Randy