cost to install engine analyzer (4 cyl)?

"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?

I guess it does, to some extent. The difference isn't detectable until the
leanest cylinder is about to flame out.

Andrew Gideon wrote:




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

Assuming the moving metal parts are very close together in weights the
only other thing that will affect noticeable vibration is the cylinders
making different amounts of power. If you can get each cylinder to peak
within about .2 gph you will have a very smooth engine indeed.

"Andrew Gideon" wrote in message
news
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?


Andrew, every question you asked is clearly answered, in depth, in John
Deakin's AvWeb series about engine operations, including graphs and charts.
In color!!

Do your homework, lad!

Matt B.

--
A nation can survive its fools, and even the ambitious, but it cannot
survive treason from within. An enemy at the gates is less formidable,
for he is known and carries his banner openly. But the traitor moves
amongst those within the gate freely, his sly whispers rustling through
all the alleys, heard in the very halls of government itself. For the
traitor
appears not a traitor; he speaks in accents familiar to his victims, and
he wears their face and their arguments, he appeals to the baseness
that lies deep in the hearts of all men. He rots the soul of a nation,
he works secretly and unknown in the night to undermine the pillars of
the city, he infects the body politic so that it can no longer resist. A
murderer is less to fear. -- Marcus Tullius Cicero

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



randall g =%^) PPASEL+Night 1974 Cardinal RG
http://www.telemark.net/randallg
Lots of aerial photographs of British Columbia at:
http://www.telemark.net/randallg/photos.htm
Vancouver's famous Kat Kam: http://www.katkam.ca

randall g wrote:



When you are running at a typical rich setting, the maximum possible
combustion will be occurring in all cylinders.



Not quite. This only happens at a certain mixture setting. Any other
setting reduces power.

On Tue, 03 Oct 2006 19:39:26 -0600, Newps wrote:



randall g wrote:



When you are running at a typical rich setting, the maximum possible
combustion will be occurring in all cylinders.



Not quite. This only happens at a certain mixture setting. Any other
setting reduces power.



Fair enough, but on the rich side of peak the power curve (vs fuel flow)
is fairly flat, so power differences are relatively minor. On the lean
side it drops much more quickly.




randall g =%^) PPASEL+Night 1974 Cardinal RG
http://www.telemark.net/randallg
Lots of aerial photographs of British Columbia at:
http://www.telemark.net/randallg/photos.htm
Vancouver's famous Kat Kam: http://www.katkam.ca