<VV> Installation of engine pistons

[hallgrenn at aol.com]

Nice.  Thanks Chuck.
 
Bob
 
 
-----Original Message-----
From: BBRT via VirtualVairs <virtualvairs at corvair.org>
To: Jerry Brown <air_cooled63 at yahoo.com>
Cc: virtualvairs <virtualvairs at corvair.org>
Sent: Sat, Oct 25, 2014 3:30 pm
Subject: Re: <VV> Installation of engine pistons


Offset piston rods are used in pistons to reduce piston slap when piston 
crosses top dead center (TDC).
From Google...
Piston is generally offset to major thrust side of cylinder. The major 
thrust side is the side of the cylinder wall the piston is pushed against on 
the power stroke. The minor side is the side the piston rides against as it 
pushes upward the compression stroke. The purpose of the offset is to reduce 
the amount of piston slap as the piston is forced from the minor to the 
major thrust side just after crosses TDC. Then the piston is pushed up on 
the compression stroke it rocks slightly so the lower skirt on the major 
thrust side contacts the cylinder wall. As the piston crosses TDC that 
contact allows the rest of the skirt to ease its way over to the major 
thrust side. Without the tilt of the piston, the skirt would ride up the 
minor side, reach TDC and be slammed agasint the other side by, to 
combustion pressure.

Chuck S
----- Original Message ----- 
From: "MarK Durham via VirtualVairs" <virtualvairs at corvair.org>
To: "Jerry Brown" <air_cooled63 at yahoo.com>
Cc: <virtualvairs at corvair.org>
Sent: Saturday, October 25, 2014 3:10 PM
Subject: Re: <VV> Installation of engine pistons


> Jerry, always follow the tech manual for the engine. Even when it appears
> that everything is symmetrical and balanced. How else are you going to 
> tell
> what you have down the road or while you are working? If you do your work
> in a inconsistent way, there are more chances to make mistakes, forget
> something, etc, and aligning the piston marks and rod position numbers 
> help
> to provide that consistent work we rely on to provide years of trouble 
> free
> motoring.
>
> While I did assemble my engine 4 years ago, I did not check to see if 
> there
> was offset built into the location of the piston pin, or if the rods were
> something else besides symmetrical. I have seen aircraft engines and
> automotive engines were there were offsets in piston pin location to
> compensate for say a piston leaning in a V-6 or V-8, or in a flat
> configuration like aviation piston engines and Corvair motors are.
>
> In short, follow the book!  :):)  If you don't, then you should not be
> doing the work. You are bound to make mistakes.
>
> Mark Durham
> Hauser, Idaho
> 62 Monza coupe Red/Red 4 speed
>
> On Sat, Oct 25, 2014 at 11:46 AM, Jerry Brown via VirtualVairs <
> virtualvairs at corvair.org> wrote:
>
>> Through the years I have had several persons tell me that when installing
>> the pistons and rod to the crankshaft that it didn't matter if the piston
>> didn't face the fly wheel because each rod had it own journal  to ride on
>> and didn't share a journal like some Chevy straight 6 cylinders.  I know 
>> in
>> the tech manual that it says the notch should face the flywheel.  Is 
>> there
>> something in the mathematics that the rod number should be up and the 
>> notch
>> facing the flywheel? I know some of you engine Gurus can help me on this 
>> so
>> I can be sure if the these people telling me it's ok to install a piston
>> backwards.   I have always followed the tech manuals instructions.  Jerry
>> Brown
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