engine pinging but does not show on wideband
10-14-04, 01:57 PM
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engine pinging but does not show on wideband
Is it possible that the 3rd gen street port motor would ping and not show any changes on the AF off a wideband?
Last edited by jupiter; 10-14-04 at 02:16 PM.
10-14-04, 04:09 PM
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That is wrong. AFR alone does not determine if an engine will ping/knock. It's ignition timing and amount of fuel that are the main ingredients. If your timing is too far advanced for a given load (or your gas is not good enough), it doesn't matter how much fuel you run (unless it's so rich that it won't ignite), the engine will knock.
You can have engine destroying knock at 10:1 AFR's if the timing is too far advanced. Similary, you could run as lean as 13:1 (not recommended), but if your timing is pulled far enough back, you won't hurt anything.
Sonny
You can have engine destroying knock at 10:1 AFR's if the timing is too far advanced. Similary, you could run as lean as 13:1 (not recommended), but if your timing is pulled far enough back, you won't hurt anything.
Sonny
10-14-04, 04:49 PM
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EGT's will give you a good idea if you have timing issues, BTW. If you have solid AFR's but sky-high EGT's, time to pull out some timing.
Dale
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10-14-04, 07:41 PM
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If you are pinging, you would know it. Unless you are running ceramics, it's called cracked apex seals. Also, Dale is on target......an accurate EGT gauge is invaluable.
10-14-04, 09:46 PM
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Rotaries usually do NOT tolerate pings well...I'd say more than 4-5 hard ping runs and any rotary would be just about done. The thing is, the rotary is so loud (exhaust, and internally) that by the time you hear a ping audibly, it's a pretty bad one internally. The small ones that you'd say would probably not be so severe, can't even be heard over the engine itself.
10-14-04, 10:46 PM
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Originally Posted by GoodfellaFD3S
If you are pinging, you would know it. Unless you are running ceramics, it's called cracked apex seals. Also, Dale is on target......an accurate EGT gauge is invaluable.
10-15-04, 12:29 AM
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Yep, oil in your gas effectively reduces the octane. That's why it's so common for PCV systems to get ditched in "performance" car applications. The PCV system that I had in my old car essentially piggybacked the stock PCV system but forced the oil vapors to go upwards through a series of baffles. This pretty much eliminated oil going back into the intake.
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10-15-04, 04:49 PM
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So this brings me to a conclusion that it was not pinging but rather something else inside the engine that is making this noise that might have thought to be detonation?
10-15-04, 05:07 PM
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Originally Posted by Sonny
It's ignition timing and amount of fuel that are the main ingredients. If your timing is too far advanced for a given load (or your gas is not good enough), it doesn't matter how much fuel you run (unless it's so rich that it won't ignite), the engine will knock.
Sonny
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10-15-04, 05:31 PM
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It's a loud knocking sound coming from the engine compartment. The exhaust system is mostly new.dp, magnaflow mp, hks ti. I'm now running 113 unleaded race gas. This noise occurs around 3000-3500 rpm with 0-3 lb boost.
10-15-04, 05:32 PM
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Originally Posted by lopedl
That shouldn't be an issue for the FD you can't even adjust the timing. The only thing that would influence detonation in the fd is AFR's, temperature, and octane.
Sonny