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Author Topic: how to make piston/liner hones  (Read 1459 times)

Offline Lane Puckett

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how to make piston/liner hones
« on: April 05, 2012, 07:43:48 PM »
I recall there being an article in Model Aviation on how to make a piston and liner hone.

Does anyone know what issue that was in?

Also are there any other how to articles on making a piston and/or liner hone?

Thank you,
Lane
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Offline Tim Wescott

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Re: how to make piston/liner hones
« Reply #1 on: April 05, 2012, 08:08:51 PM »
Not exactly what you're asking for, but this month's Model Engine News has a nice picture of some shop-made outside hones; if you go through the back issues and the engine build articles their's a wealth of information.

(And an engine that I rebuilt is in there, too, even if it's very much a beginner effort).

http://www.modelenginenews.org/
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Online qaz049

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Re: how to make piston/liner hones
« Reply #2 on: April 08, 2012, 05:13:04 AM »
Quote from: Lane Puckett on April 05, 2012, 07:43:48 PM
I recall there being an article in Model Aviation on how to make a piston and liner hone.

Does anyone know what issue that was in?

Also are there any other how to articles on making a piston and/or liner hone?

Thank you,
Lane

Lane,

you probably mean the Glen Lee article in the May 1996 issue of Model Aviation.

I have them scanned if you don't have the issue.

There are a few other articles on the topic perhaps the best is in the David Owen "Mate" diesel  build instructions on the MEN site.

regards Ray
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Offline Tim Wescott

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Re: how to make piston/liner hones
« Reply #3 on: April 08, 2012, 08:19:50 AM »
Having lapped my first piston/cylinder combo for real just a month or two ago, all I can say is that once you have a feel for it the process itself is simple.

Be sure to use a fine enough abrasive -- the experts call out 800 or 1000 grit; pay attention.  I used Brasso (after screwing up a piston with 320 grit) because I'm a tightwad, and it works.  Too coarse a grit = too fast a cut, you can go from too tight to "oh @#$%" in one cut.

Even using Brasso (which cuts very slowly), I still made the fit a bit generous.  On the bench it felt really, really, tight.  I got impatient, cleaned things up, and tried it in the engine -- and in about half a dozen strokes it went to what felt like a nicely broken-in engine.  Given that the engine wasn't broken in yet, I suspect it'll have a short life.  (It runs fine now, but then it's only had about 10 minutes of running time).
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AMA 64232

The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline BillLee

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Re: how to make piston/liner hones
« Reply #4 on: April 08, 2012, 09:12:46 AM »
What are folks doing that they need a piston or cylinder lap?

I can understand that if you're making new parts for old engines, or making new parts for a homebuilt or something. But if somebody is lapping the pinch out of a modern engine like a PA or a Jett or an OS or  ...,  I think you are fooling yourself into ruining a bunch of good equipment.
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Offline Tim Wescott

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Re: how to make piston/liner hones
« Reply #5 on: April 08, 2012, 08:38:17 PM »
I can't speak for Lane -- I'm building engine parts from scratch.
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The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline Lane Puckett

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Re: how to make piston/liner hones
« Reply #6 on: April 11, 2012, 07:31:39 AM »
Bill,
I picked up some one off oversize pistons and need to fit them. 

Ray,
If you wouldn't mind emailing the scanned article I would be very appreciative.  As I recall there were two articles, one detailing the piston lap and one the cylinder lap but that is just from memory.

email is lkp1@yahoo.com

I'll go check out the other online reference you mentioned.  My search on that site before was very productive.  Quite a few very talented folks sharing their knowledge, it was interesting reading and I picked up some good ideas.

Lane
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Online qaz049

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Re: how to make piston/liner hones
« Reply #7 on: April 13, 2012, 04:48:47 PM »
Quote from: Lane Puckett on April 11, 2012, 07:31:39 AM
Bill,
I picked up some one off oversize pistons and need to fit them.  

Ray,
If you wouldn't mind emailing the scanned article I would be very appreciative.  As I recall there were two articles, one detailing the piston lap and one the cylinder lap but that is just from memory.

email is lkp1@yahoo.com

I'll go check out the other online reference you mentioned.  My search on that site before was very productive.  Quite a few very talented folks sharing their knowledge, it was interesting reading and I picked up some good ideas.

Lane

I've emailed the Article to Lane. The second page  should be attached below. The first is too large to attach so send me an email if you want a copy. They are a little indistinct in places I'm afraid but otherwise useful.

Ray
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