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Air / Fuel Ratio |
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KFD14 
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Joined: September-07-2008 Location: Hailey, Idaho Status: Offline Points: 226 |
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 Topic: Air / Fuel RatioPosted: July-24-2012 at 1:51am |
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Any body have a way to get an actual measurement of the A/F mixture without putting the engine on a dyno?
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SNobsessed
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Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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Posted: July-24-2012 at 9:39am |
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Best way is to read the plugs. You want a tan color.
Someone had a design for adding an o2 sensor, but that was for EFI & I doubt if you want to install all that. |
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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Gary S
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Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Posted: July-24-2012 at 10:28am |
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Do a search on 81 nautique. Alan made a sweet adapter to add a o2 sensor to his carbed 81. The post was from a number of years ago.
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89Martinique
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Joined: September-05-2011 Location: Binghamton Status: Offline Points: 457 |
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Posted: July-24-2012 at 1:02pm |
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you can buy o2 sensor that have a read out from k&n, edelbrock, and many others.
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Current Boats:
1992 Supra Comp-TS6M PCM 351w HO Pro Boss Pro-Tec Ignition - Full Composite (no wood stingers!) 1989 (3rd Gen) Correct Craft Martinique B/R PCM 351w Power Plus 1984 E-Scow Keuka Lake, |
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KFD14
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Joined: September-07-2008 Location: Hailey, Idaho Status: Offline Points: 226 |
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Posted: July-24-2012 at 1:20pm |
This is the standard qualitative measurement. I was hoping to get an actual quantatative measurement of A/F ratio to help dial the carb in. I'll look into 81's O2 sensor adaptor. |
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GottaSki
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Joined: April-21-2005 Location: NE CT Status: Offline Points: 3335 |
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Posted: July-24-2012 at 1:43pm |
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In my opinion, tan is still too rich.
Look at an efi engine's plugs, they are white. White is making the best heat. Heat means more expansion of gasses and expansion means power. Now grey is bad. After a wot run, One needs to cut the threads off a fresh plug or scope the plug to check the width of the soot ring at the base of the insulator when you are in this range. An out of the box proper list holley 4160 will produce white insulators with proper ignition and heat range plug. |
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SNobsessed wrote: