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Crank Balancing ( Math )

To: <land-speed@Autox.Team.Net>
Subject: Crank Balancing ( Math )
From: "Rick Yacoucci" <turborick@TurboRick.com>
Date: Mon, 11 Oct 2004 10:45:47 -0700
 I got a "what if" for the math guru's

Let say you want to take 4 cylinder engine and take out two pistons and run
it as a two cylinder.
You need to put weight back on the crank journals for the engine to stay in
balance

But how much weight???........

I would think you would need to put the whole rotating weight of the rod and
bearing
Plus a portion of the reciprocating weight of the whole piston and rod
assembly

The firing order is 1-2-4-3 so we would either run 2 and 3 or 1 and 4
because they run 360 deg apart


Rod weight
Total Weight 346 grams
Rotating Weight 251 grams
Reciprocating Weight 95 grams
Center to center 4.775

Main bearing weight 23.5 grams

Complete Piston weight 293.3 grams


Rick

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