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Old 12-27-2008, 02:03 PM   #41
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Re: torque for bolts

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Originally Posted by G-copterbous-funk View Post
You need to know the bolt grade
I still think the aluminum is softer, no matter what the grade of steel.
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Old 12-27-2008, 05:59 PM   #42
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Re: torque for bolts

Originally Posted by Propworn View Post
I wonder what Andrew uses.
My opinion... if you are referring to this Andrew...

I do not use a torque wrench. I have been taking apart and reassembling model airplane engines for 31 yrs now, on hundreds of engines - maybe over a thousand by now.

I believe that if you are somewhat experienced with small fasteners, mainly steel machine screws with fine threads into aluminum, you should be just fine taking apart and reassembling engines without measuring torque.

However, there will always be those who are heavy handed, and have a tendency to stripout threads or damage screw heads a lot. And at the other extreme, those who are too frightened of damaging something that they under tighten screws casuing things to come loose.

In my experience in the hobby, 99.9% of the guys I know who work on there own engines do just fine without anything special.

I do not however, discount those like Ed who are at the extreme top of their game and want to do things as best as can be.

But IMO for the average sport engine we run, with some experience, you are fine using your fingers to "measure" torque. That doesnt mean go and take apart your OS 4 cylinder Pegasus as your first engine you work on... work on a number of simple 4 strokes until you get a feel for it.

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Old 12-27-2008, 06:17 PM   #43
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Re: torque for bolts

Originally Posted by moo View Post
I still think the aluminum is softer, no matter what the grade of steel.
No doubt the aluminum is softer and that is the reason that the threaded aluminum holes in the casting generally have a deeper hole than a steel nut in order to compensate for the softer material.

More threads contacting the bolt lessens the stress on each individual thread in the softer aluminum.
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Old 12-27-2008, 07:16 PM   #44
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Re: torque for bolts

Originally Posted by AJCoholic View Post
My opinion... if you are referring to this Andrew...

Yes indeedy you are the Andrew I refer too. Thanks for chipping in, your opinion and knowledge are always appreciated.

People seem to forget there are many ways to accomplish the same end. Not all methods are perfect but often do just fine for the intended use. Be it construction, design or rebuilding engines if there was one and only one way to go about the project then we would all be doing it the same way. That there are many successful modelers out there with many differing methods proves this out. The Kiss principle is sometimes the most practical. If what you are doing works for you then it is the right way for you until you learn a better one. If one keeps an open mind the amount of knowledge to be gained is unlimited.

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Old 12-30-2008, 09:28 PM   #45
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Go Dr. Jesso a.k.a. ( Volksman) <<<<<<<<<<,
Have a great day!!!

Last edited by popcan; 12-31-2008 at 12:58 AM.
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Old 12-31-2008, 07:49 PM   #46
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Re: torque for bolts

To do it properly, aluminum should have studs and nuts rather than bolts and always course threads for either one.
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