REFLECTOR: Piston

[John Dibble]

Kurt,

I'm with you.  I'd like to make it as best as I can within reason.  I
spoke to my uncle who raced cars and he thinks it's ok to put something
in the wrist pin.  I have some used pins as well and I was checking the
weights on them.  All were about the same escept for one that was 2.5
grams heavier.  I looked inside and there was a piece of thin sheet
metal curled up inside, so now I feel confident that I can put something
in there without a problem.

John

nmflyer1 at aol.com wrote:

>  John, I'd have to get the paperwork and talk to the machine shop to
> remember all the details. I do know that they had to add Heavy Metal
> to the crank to get it just right. Then the usual weighing of pistons,
> rods, and everything else in the rotating assembly. I do, sort of,
> agree with the statement of slow rpm aircraft engines. However, things
> can only improve & stresses reduced on a well balanced engine. Just
> something that I have always done "while Im in there".  Kurt
>
>
> -----Original Message-----
> From: John Dibble <aminetech at bluefrog.com>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Sent: Tue, Jul 12, 2011 7:31 am
> Subject: Re: REFLECTOR: Piston
>
> What techniques were used to balance your engine?nmflyer1 at aol.com
> wrote:
>
>> Have a good engine speed shop add some "heavy metal" to the wrist
>> pin to get the weight right. They can get it exact. Don't use a
>> discount engine shop, use a custom speed shop. My engine is balanced
>> to less than 1/2 gram. Kurt
>>
>>
>>
>> -----Original Message-----
>> From: John Dibble <aminetech at bluefrog.com>
>> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>> Sent: Mon, Jul 11, 2011 7:33 pm
>> Subject: REFLECTOR: Piston
>>
>>
>> I'm replacing a piston.  The new one is 35 grams lighter than the old
>> one.  I need to have the weight the same as the opposing piston.  I
>> could machine the opposing one or replace it with a lighter one, but I'd
>> prefer if I didn't have to.  Can I add weight inside the wrist pin of
>> the lighter one?
>>
>> John
>>
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