Subject: Re: con rods
Author: Ambo-@netscape.net
Date: Sep 15, 2004, 3:32 PM
Post ID: 1717535489
Hi Guy,
I believe MG Cycle used spacers under the cylinders to compensate for longer (Carillo?) con rods on their championship winning race bike. Cheers,
Charlie
Guy Winton <guy-@cox.net> wrote:
That's what I wuz afraid of....one doesn't change the stroke (and cylinder volume) by changing the rod length. For any given stroke, a variety of rod lengths can be (and are) used as a method of tuning the engine's power characteristics. In this case, given the increased stroke length, and the use of the same rods, the piston deck height had to change (or the cylinders had to be shimmed up with "stroker plates") to prevent the piston from popping up out of the cylinder. Which makes me wonder - has anyone heard of someone using stroker plates on a Guzzi?? -Guy- Hi Guy, The bore on the 750 and the 850 is the same (83 mm), yet diffent pistons are used. The stroke is increased between the 750 and the 850 (from 70 to 78 mm), but was done so by a change to the journal height on the crankshaft. So, Guzzi decided to change three more expensive parts (2 pistons and 1 crankshaft) instead of two less expensive parts (2 connecting rods) just to increase the stroke. |
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