Hi Rich & List,
The pin is offset in the piston to reduce piston slap. It sounds like a
ticking in the engine but to reduce the noise, the remedy (offset)
actually causes increased friction. When I built my Slant 6 drag motor in
the early 80's one of the tricks was to put the pistons on the rods
"backwards" to lessen the friction effects. I don't remember it making
any more noise though. At the time it was more powerful than the new 5.0
Mustangs and Camaros. Many were bummed that they got smoked by a 6 cyl
Dart.
SteveB
'79B
On Thu, 21 Jan 1999 19:19:07 EST Rikrock@aol.com writes:
>Hello,
>
>Today, I learned enough to answer some of the questions I asked
>earlier
>concerning the offset wrist pin.
>
>I stopped by a local garage that works on British cars, and
>specializes in
>MGB's. As luck would have it, the owner had a set of new Hepolite
>pistons
>still in the boxes. None of the pistons had an arrow on them, but
>each one
>had "front" stamped on it. Like the pistons in my friend's engine,
>the wrist
>pin is offset toward the distributor side of the engine. The mechanic
>was
>just as puzzled as I as to why this is. He was also amazed that in
>the
>twenty-plus years he has been working on these engines he never
>noticed the
>offset. One thing we came up with to explain the offset is the
>possibility
>that the crankshaft is offset from the center of the cylinder bore,
>but he
>didn't have a block we could check. Anyone care to look in to that?
>Any
>other ideas?
>
>Bottom line here is that the the pistons in my friend's engine were
>installed
>properly, in spite of the rear-pointing arrow. The con rods were
>also
>installed properly, based on the location of the cylinder oiling hole.
> In
>other words, we could have left things the way they were, and
>everything would
>have been fine!! Oh well, at least we learned something......
>
>Thanks much to those who responded!
>
>Rich Rock
>
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