On Sun, 01 Oct 2006 17:26:40 -0400, Andrew Gideon
wrote:

On Sat, 30 Sep 2006 17:33:54 -0500, Dan Luke wrote:

One or more cylinders wiil get too lean before the others, causing uneven
power production.

So the rough running is called by cylinders generating different power
levels? Why can't that occur anywhere in the air/fuel mixture curve?


When you are running at a typical rich setting, the maximum possible
combustion will be occurring in all cylinders. The excess unburned fuel
is blown out the exhaust. Since cylinders are about the same size and
compression, you have very similar powers being developed.

Once you start leaning though, the first cylinders to lean past max
power will begin developing less power while all the others are still at
max. This uneven distribution in power results in roughness. As you
continue leaning the cylinders get more unbalanced.

I have just installed Gamijectors in my engine and am about to receive a
second set. They iterate with you until you get peak power/temperatures
to coincide on all cylinders. Once this is done, you can lean quite
aggressively without unbalancing the power produced.

Read Deakins articles on the subject:
http://www.avweb.com/news/pelican/list.html



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