RaceHemi
01-06-2006, 12:29 PM
Wondering if anyone is watching air fuel ratios????
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jholly 01-06-2006, 01:48 PM why?? Jim RaceHemi 01-06-2006, 01:52 PM If AFR is a concern when tuning other types of internal combustion engines, why wouldn't it matter when tuning a diesel? jholly 01-06-2006, 04:07 PM Because on diesels the AFR can range from 12-1 (hammer down) to 200-1 or higher (going down hill). Remember diesels don't control power with a throttle plate, but with the fuel injected into the cylinder. Seems like it would be in the "now that is interesting" catagory. Jim RaceHemi 01-06-2006, 07:31 PM I understand the diesels operating characteristics. Are you saying that if I take a diesel engine running at WOT on a dyno and vary the AFR from 10-1 up to 200-1 that power levels will remain unchanged? Or is there a point in between 10 and 200 that offers more potential? Fingers 01-06-2006, 08:28 PM It is not the same AFR across the rev range. In short, it is not a parameter that applies well to diesels. jalanrr 01-06-2006, 08:41 PM Some interesting reading: http://www.ornl.gov/~webworks/cppr/y2001/rpt/122001.pdf http://www.eng-tips.com/viewthread.cfm?qid=130502&page=1 :) | ||