Running Lean
Thread Starter
Pro
Joined: Jun 2001
Posts: 528
Likes: 147
From: Palmyra NY
Running Lean
My 75 appears to be running a little lean. I pulled the plugs the other day, and they looked dry and black. My question is, how do I monitor this, and how do I adjust this? It is the stock motor with an Edelbrock Performer cam, performer carb (600cfm), and performer intake. I think I can change the springs for the metering rods, but I am not sure which ones to replace them with. Any advice?
Friend Request Magnet
Joined: Dec 2005
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From: ♫ ♪ ♫♫ ♪ ♫ ♪♪ ♫
Originally Posted by JGreen
My 75 appears to be running a little lean. I pulled the plugs the other day, and they looked dry and black. My question is, how do I monitor this, and how do I adjust this? It is the stock motor with an Edelbrock Performer cam, performer carb (600cfm), and performer intake. I think I can change the springs for the metering rods, but I am not sure which ones to replace them with. Any advice?
I purposely run mine slightly richer in summer time and swap often.
Go to this site and read your condition...scroll down:
CARBON FOULED--Soft, black, sooty, dry-looking deposits
Yes, it is a site for bikes, but the same general idea.
Jim
Tech Contributor
Joined: Aug 1999
Posts: 14,379
Likes: 6,390
From: At my Bar drinking and wrenching in Lafayette Colorado
Originally Posted by JGreen
My 75 appears to be running a little lean. I pulled the plugs the other day, and they looked dry and black.
Thread Starter
Pro
Joined: Jun 2001
Posts: 528
Likes: 147
From: Palmyra NY
How about I take a picture of one tonight and post? Can you tell from a good picture what condition they are in? I am used to computerized cars that tell me when there is a problem, or it is easy to monitor with my laptop.
Le Mans Master
Joined: Jan 2006
Posts: 8,319
Likes: 7
From: Wilmington DE, Drive it like you stole it, 68 327 4 speed coupe
Originally Posted by JGreen
How about I take a picture of one tonight and post? Can you tell from a good picture what condition they are in? I am used to computerized cars that tell me when there is a problem, or it is easy to monitor with my laptop.
sure post a pic, therea a bunch of us here who can diagnose plugs the old school way
tim
Race Director
Joined: Nov 2000
Posts: 11,872
Likes: 12
From: Waterloo ontario Canada
My plugs are white. It is really not that easy to run too lean but the advantages of lean running is long life on the plugs plus a motor lasts alot longer.
I run my motor around 190 degrees, lots of timing and 15-1 on the fuel ratio gage.
Plugs??? Never bother changing them and yet I do spot checks all the time.
I run my motor around 190 degrees, lots of timing and 15-1 on the fuel ratio gage.
Plugs??? Never bother changing them and yet I do spot checks all the time.
