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REPORT ABUSIVE REPLY
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Message Subject
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Question for the Auto Mechanics, Rotten Egg Smell *REVISITED* Pg 5
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Poster Handle
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Anonymous Coward |
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Post Content
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Always better to run rich no matter how it's boosted. Rich will give you some margin of safety. Lean will cause detonation / preignition issues. Lean is hot. Two strokes will seize if they go lean under (heavy) load / throttle.
Now, diesels on the other hand....
Quoting: Anonymous Coward 73706403 not necessarily true with boost. N/A motors yes. with boost lean conditions rarely open up the chance of pre-ignition due to charge air being cooled prior to entering the plenum, lowering the IAT, and effectively having a cooling effect on the pistons. with boost (especially turbo) running rich to compensate for increased boost can cause detonation if proper compression ratios are not maintained I.E changing your stock supercharger pulley to create more boost, without changing the compression ratio to compensate for the increased pressure, changing the original Knock resistance characteristics. I respectfully disagree. Lean is what is going to smoke a piston. Rich is going to have a cooling effect. Now, if you are referring to going way lean from stoich, and getting a "cooling" effect from that I may agree with you. But you are only fooling yourself with that. Increasing boost (to increase power / BMEP) and then having to run lean to prevent full heat is a crutch to justify the boost number. You should be able to achieve slightly richer than stoich (say, 12.5:1) at a given CR and boost number. In other words, you should not be running lean to justify CR and Boost numbers. This is not how you achieve maximum Brake Mean Effective Pressure.Can you elaborate? Never mind, I looked it up. I wouldn't get too hung up on any of that. That was just the two of us going on about combustion semantics of sorts, and really doesn't have anything to do with your particular issue. You need to determine if you are indeed running too rich, and if so, why.
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