AirSpeed VW Community Forums

Technical => Engine Tech Forum => Topic started by: slammedbus on February 20, 2015, 07:01:27 PM

Title: piston sizes
Post by: slammedbus on February 20, 2015, 07:01:27 PM

So my son ripped his motor apart today. We see the Pistons are stamped std. But I measure a diameter of 90mm...... how does this make sense?  Used two different sets of calipers.

Title: Re: piston sizes
Post by: 70's Looker on February 20, 2015, 07:44:12 PM

Aluminum cylinders? There were 90s but rather uncommon to have survived this long...

Title: Re: piston sizes
Post by: slammedbus on February 20, 2015, 07:55:49 PM

No sir. Not aluminum

Title: Re: piston sizes
Post by: 52 split on February 20, 2015, 11:37:44 PM

what size is stamped on the piston. some one just put a 1756cc motor together my guess. NPR had 90mm at one time.

Title: Re: piston sizes
Post by: slammedbus on February 21, 2015, 08:47:31 AM

That's just it. No size stamp.....

Title: Re: piston sizes
Post by: slammedbus on February 21, 2015, 02:27:42 PM

Bah! Old eyes. Took the eleven year old to see the 90.45 stamp