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Optimum air / fuel ratio for marine engine

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Old 01-05-2007, 10:07 AM
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Default Re: Optimum air / fuel ratio for marine engine

Originally Posted by Rage
To be blunt, given the variability of EGT measurements emntioned as a function of the distance from the combustion chamber, it would seem that all it is good for is cylinder to cylinder EGT balance check. Are there EGT numbers for that?
Anyone?
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Old 01-05-2007, 12:48 PM
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Default Re: Optimum air / fuel ratio for marine engine

Originally Posted by articfriends
I had gaffrig/livorsi egt gauges with temp probes on my lightning headers and they read 200-250 degrees HIGHER than actual temp,hopefully they have straightened that out but mine were about usueless,Smitty
Mine also ran high,The stock 500efis would run 1500-1550 on the gage at wfo .High 1400's from 3000 up.

Also remember that pump gas will read a higher temps than race fuel.
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Old 01-05-2007, 12:53 PM
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Default Re: Optimum air / fuel ratio for marine engine

Originally Posted by rmbuilder
Some helpful information regarding EGT and tuning parameters;
http://www.maxracesoftware.com/egt_probes.htm

Bob

Bob some more of Larry Meaux's knowledge
Just think he's just some dyno guy in a corn field in La
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Old 01-06-2007, 02:08 PM
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Default Re: Optimum air / fuel ratio for marine engine

TYLER or ?? Question..I have a portable air/fuel monitor with dual probes. I want to put one on each engine to see ratio at different rpms. what cylinder woud be best on blown/cooled/572? and also, how far from the motor is acceptabe? in a spacer or drilled into the head itself? does the distance matter by going to the collector of the header?
Thanks for any info.
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Old 01-06-2007, 02:27 PM
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Default Re: Optimum air / fuel ratio for marine engine

Originally Posted by Bad Girl
TYLER or ?? Question..I have a portable air/fuel monitor with dual probes. I want to put one on each engine to see ratio at different rpms. what cylinder woud be best on blown/cooled/572? and also, how far from the motor is acceptabe? in a spacer or drilled into the head itself? does the distance matter by going to the collector of the header?
Thanks for any info.
The only reason I see to put it a single tude is if you can tune each hole sepretaly.All that ive seen are in the tail pipes on marine headers

picks here
http://www.offshoreonly.com/forums/s...ighlight=bungs
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