<VV> Holes drilled into piston crowns?!

Harry Yarnell hyarnell1 at earthlink.net
Sun Aug 6 21:04:30 EDT 2006


A notch maybe. All factory pistons have them. The notch faces the flywheel.

Harry Yarnell
Perryman Garage and Orphanage
hyarnell1 at earthlink.net
----- Original Message ----- 
From: "John McMahon" <jmac2112 at adelphia.net>
To: "Virtual Vairs" <virtualvairs at corvair.org>
Sent: Sunday, August 06, 2006 7:58 PM
Subject: <VV> Holes drilled into piston crowns?!


> First, I'd like to thank everyone who let me know that the valve stem 
> diameter for Corvairs is 11/32"!
>
> As I tear further into my 140 engine, I have discovered something strange. 
> Each piston has a hole drilled in the top, near the edge, with a little 
> channel carved out that leads from the hole to the edge of the piston. 
> The holes are about 1/4" in diameter, and about 1/8" deep.  Now, this 
> might be "in the book" somewhere, but I've never seen it, nor have I ever 
> heard of such a thing.  Anyone know what the story is?
>
> Thanks,
>
> John McMahon
> 1965 Monza coupe (with a spare 140 engine)
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