Intake, Header, HFC, CBE = Too Lean?

F.I. Inc. · 03-24-2010, 09:48 AM

Quote:

Originally Posted by Red370

Self admittedly, I know jack squat about A/F ratios, but i'm curious... my AP says that i'm running an avg. of 14.2-14.4 at idle, is that a normal idle ratio? is it only considered running lean at a specific RPM?

You are fine! Optimum A/F ratio at idol is 14:7! Now WOT (Wide Open Throttle) You reallly want to be in the high to mid 12 range once you get above 4-5000 RPM. At the lower RPM's the A/F being leaner will not be catastrophic to the engine. However if you run it the high 13's low 14's in the upper RPM range you can cause serious damage to the engine. Detonation will occur inside of the engine and you can actually hear it if it is real bad. Bottom line, it is not enough fuel.

Thanks, Tony

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
DIY: Stillen header installation	semtex	DIY Section (Do-It-Yourself)	39	01-10-2017 04:29 PM
Running too lean?	G37Sam	Tuning	21	06-01-2010 10:25 AM
Stillen header issue finally fixed	1uk32	Intake/Exhaust	14	10-04-2009 06:37 PM
question about stillen header	chirojin	Nissan 370Z General Discussions	0	07-12-2009 02:38 PM
Muffler shop ? and header questions..	AceSpade77	Intake/Exhaust	3	05-06-2009 11:35 AM