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-   -   A/F ratios (https://www.racingjunk.com/forums/showthread.php?t=19934)

suicidebomb 02-22-2008 05:03 PM

A/F ratios
 
How lean can one go and still not get into detanation in a N/A engine on methanol? For instance in my sbc 406 about 4.75/1 is as lean as i have tried. I still get quite a bit of oil dilution, so i assume I am still pretty rich, but I am afraid to go much leaner for fear of burning a hole in a piston. does anyone know if I can go, say 5/1 or maybe a little more 5.25/1 and still be safe, and maybe solve some of the dilution or at least cut back on it some.

johnracer 02-22-2008 05:15 PM

I don't really know about a/f ratios, but, if it were mine. I'd tune it to run the best and quit worrying about it...

suicidebomb 02-22-2008 06:43 PM

4.75/1 was its best E.T. and speed to date, and I would like to try it leaner, but I am worried about burning my engine down. However, I still appreciate your input, thanks.

zipper06 02-22-2008 10:50 PM


Originally Posted by suicidebomb
4.75/1 was its best E.T. and speed to date, and I would like to try it leaner, but I am worried about burning my engine down. However, I still appreciate your input, thanks.

Where did you get these #'s from?, you need to run an EGT and keep the #'s around 1100 degrees on topend. if you go leaner than that you will burn something down.

JMO

Zip.

johnracer 02-23-2008 03:15 AM

Don't be afraid to lean it out. You'd have to go really, REALLY lean to hurt it unless you're running nitrous or some sort of forced induction with a lot of boost....

johnracer 02-23-2008 03:21 AM

Another thought, if you're injected, the oil delution could be the barrel valve adjustment, or running the engine too cold w/carb or injection...

Tod74 02-23-2008 04:24 AM

Like ZIP said you need an EGT.

suicidebomb 02-23-2008 04:35 AM

Where can I get an EGT?

Tod74 02-23-2008 04:37 AM

http://www.ronsfuel.com/accessories.cfm

zipper06 02-23-2008 08:41 AM

Also here for duel setup $300.00

Zip.

http://www.exhaustgas.com/ProductDet...ID=sub2&RepID=


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