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Author Topic: LA .46 setup question  (Read 1546 times)

Offline David Ruff

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LA .46 setup question
« 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.




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Offline Brad LaPointe

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Re: LA .46 setup question
« Reply #1 on: February 11, 2018, 10:53:00 AM »
One head gasket, leave it stock . Those O.S. Head gaskets are thick . See the LA .46 set up guide above .

Brad
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Offline David Ruff

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Re: LA .46 setup question
« Reply #2 on: February 11, 2018, 11:10:00 AM »
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.

« Last Edit: February 11, 2018, 12:30:41 PM by David Ruff »
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Offline Brett Buck

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Re: LA .46 setup question
« Reply #3 on: February 11, 2018, 02:01:43 PM »
Quote from: David Ruff on February 11, 2018, 11:10:00 AM
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
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Offline David Ruff

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Re: LA .46 setup question
« Reply #4 on: February 11, 2018, 02:48:09 PM »
Quote from: Brett Buck on February 11, 2018, 02:01:43 PM
  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

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Online Dan McEntee

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Re: LA .46 setup question
« Reply #5 on: February 11, 2018, 04:47:05 PM »
Quote from: David Ruff on February 11, 2018, 02:48:09 PM
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
   
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Offline RandySmith

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Re: LA .46 setup question
« Reply #6 on: February 12, 2018, 01:39:38 AM »
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
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Online Ken Culbertson

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Re: LA .46 setup question
« Reply #7 on: April 06, 2018, 10:09:35 AM »
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
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Offline RandySmith

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Re: LA .46 setup question
« Reply #8 on: April 06, 2018, 10:54:34 AM »
Quote from: Ken Culbertson on April 06, 2018, 10:09:35 AM
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
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