Too lean? How to check?
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Fleet Mechanic
Joined: Oct 2003
Posts: 1,371
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From: Green Springs, OH
Too lean? How to check?
What is an easy way to check if you are running too lean just put smaller jets in my 400 it runs a 1406 edelbrock i went from .098 main jets to .095 main jets and left the secondaries alone they also run .095. I dont have any popping through the carb or noticeable surging just worried about melting a spark plug or my manifolds getting too hot. Also timing is set to 12 deg. btdc and run a edlebrock performer mainfold and a summit rv cam comparable to a high energy 260h cam. Thanks for any info.
Nate
Nate
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Fleet Mechanic
Joined: Oct 2003
Posts: 1,371
Likes: 10
From: Green Springs, OH
I am running rod #1456 or 7347 number stamped on rod itself. This setup acoording to the manual is 1.5 stages lean on both power mode and cruise mode. The reference number is #7. I wanted to do # 8 which uses the #1455 rod but for some reason they forgot to put those rods in, instead I have two sets of #7547 rods.
Postmaster
Joined: Aug 2001
Posts: 4,270
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From: Delaware
A lean carb will show up as a flat spot in the power curve. It might show up just off-idle in the cruise mode, or on acceleration in the power mode.
Those Edelbrock carbs tend to be a little lean with the factory jets/rods.
Those Edelbrock carbs tend to be a little lean with the factory jets/rods.
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
Originally Posted by number_7
hey while were on the topic, chould i drill my back jets on a edelbrock 600 cfm for more power? would it work?
Larger jets can be purchased from Edelbrock, Summit Racing, Jegs, other on-line suppliers and from your local speed shop.
One step larger can help, but you need some way to measure improvement. Like a 1/4 mile strip.
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Fleet Mechanic
Joined: Oct 2003
Posts: 1,371
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From: Green Springs, OH
Yeah I did have a little flat spot in it when I first installed the carb so I swapped out the rods to what I run now. But I am on the quest of squeaking out a little more mpg so I went to the smaller jets, truck seems to run good in all aspects maybe not as much off the line power but its a compromise when you run 36" tires. I was getting around 9-10mpg highway with old setup and I am taking a 4 hour trip at the end of april with current setup if its not too lean for it. I guess I will drive the truck a bit and then check the plugs to see if they are getting too hot. I will also run the truck at night to see if the maifolds get cherry red or not.
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