<VV> Piston Slap - Pin Offset

Harry Yarnell (Verizon) harryyarnell at verizon.net
Mon Nov 4 06:26:29 EST 2019

The arrow or notch on the top of the piston is supposed to indicate the

-----Original Message-----
From: VirtualVairs [mailto:virtualvairs-bounces at corvair.org] On Behalf Of
Hugo Miller via VirtualVairs
Sent: Monday, November 04, 2019 5:29 AM
To: virtualvairs at corvair.org
Subject: Re: <VV> Piston Slap - Pin Offset

Interesting - you mean offset across the engine, not in line with the 
crank? I've never heard of such a thing. Not saying you're wrong, just 
that I've never heard of it. I did hear of one engine (Cadillac maybe?) 
where at some point in mid-production they reversed the pistons as this 
made them quieter. But I have a feeling that this was a split-skirt 
piston. Frankly I'd be surprised if a fifty or sixty thou offset mould 
make much difference to anything, but that's just my opinion of course. 
Most pistons in my encounter have an arrow or similar denotng which way 
round they should be fitted.
How would you even notice such a small offset I wonder?


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