Topica Loopframe_Guzzi Archive


Subject: Re: A, B, and C cylinders. Some bore(ing) questions

Author: Chris Berry

Date: Feb 13, 2001, 4:11 PM

Post ID: 1705421146


All-
And a very good idea it was too. When a motor is "blueprinted", matching
piston and cylinder (piston-cylider clearance) is one of the things they do.
Therefore, Guzzi has already done this for us :). The difference between
A, B, and C pistons is only a few thousandths, but it is important to run
them in their respective cylinders. Measure carefully to see if a different
piston will fit your cylinder. Clearance should be between .0010" and
.0019" for a loop frame.
Cheers!
Chris in NC
'74 Eldo civ.


 From: Ian Adkins <adk-@gte.net>
Reply-To: Loopfram-@topica.com
To: Loopfram-@topica.com
Subject: Re: A, B, and C cylinders. Some bore(ing) questions
Date: Tue, 13 Feb 2001 15:50:22 -0800

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Rich,

As I understand it there are (were) uncertainties in the manufacturing
process. Indeed the differences were small but what Guzzi did was to
identify the ranges and to keep the tolerances constant. Therefore the
pistons were matched to the cylinders.

Regards...Ian

 
My Ambo's cylinders have a 'B' cast in them indicating that they are
type 'B'. As far as I understand it there were only very (very) small
bore
 differences between the A, B and C cylinders. Does anyone have any fact,
fiction or speculation as to why this was done? Did the A's chrome flake
faster than the C cylinders? Were they all manufactured at the same time?
And was there any rhyme or reason as to how each was used during any
given
 production cycle? Or is this just another Italian mystery?

Rich


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