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Engine running lean

Shauno-81

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Quick question, is it actually harmful for your engine if its running lean? Cheers
 

07GTS

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yes too lean will make a hotter environment in the combustion and can kill pistons, thats usually why when a important sensor fails it will default to rich...
 

Turtle2388

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You can cause the engine to knock/ping and fry valves pistons etc. Not good. Obviously leaner then stock is good but the car must be tuned correctly.

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Turtle2388

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So I guess what I'm saying is, lean s
Is good! It makes power! However.. Too lean can be catastrophic.

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07GTS

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how lean are we talking..? highway cruise lean or bad lean..?
 

Turtle2388

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Lol I'm not informed enough to give an opinion. Best be talking to a tuner.

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RoaringSky

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At idle and cruising, the air fuel ratio should be aimed at 14.7:1, that's the perfect mixture. Under full load, depends on your mods etc, around 12 or 10:1.
 

RoaringSky

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Yeah depends on the mods I guess, as well as the air temp and humidity at the time of the tune, need to allow for cold weather if tuned in summer. Most of the cars I had were tuned at 12:1.
 

Turtle2388

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What's stock under full load and light load etc??

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