Knocking And Pinging

[WogsRus]

Hi all.

So i know what each is, but how do i dignose it. I keep thinking i keep on hearing things in my R33.

How does one tell if the engine is knocking or pinging. I have fitted an SAFC II and i hardly get any knock maybe up to 15 or so. The car pulls HARD and EAVEN all the time, but somethimes i swear to god i am hearing something like knocking or pinging, but the car does not stumble or anything, no missing, no smike nothing. ( hard to tell with 3.5' exhaust and HKS pod)

So how does one tell by ear if anything is happening. What noises can you tell from, and symptoms.

ALSO how do i check timming, i have a series 1.5 so a series 2 ignitor on coil, no idea how to connect things up.

What are the timing setting suppose to be at idel ect????

HELP ME FROM GOING INSANE

Edited September 13, 2006 by WogsRus

[Savage Bliss]

Knocking and pinging is generally caused by improper combustion in your engine, called "auto-ignition."

An internal combustion engine runs properly when the spark-initiated combustion wave expands rapidly but smoothly across the combustion chamber.

If the gasoline-air mixture auto-ignites somewhere in the cylinder (other than at the spark plug) just after spark ignition, the auto-ignition combustion wave can interact with the spark-initiated combustion wave, causing the vibration we hear as a knock or ping.

Increasing engine load, temperature, compression, spark-advance, air-fuel ratio, combustion chamber deposits, and decreasing altitude all increase the tendency for an engine to knock.

[WogsRus]

thanks mate, i kinda read all that before, but how do i tell if it is actually happening to my car, what symptoms, noises, loss of power ect.

HELP

[32GTRB]

get a knocklite. its around $150 and it sense sound (i think thats how it works). i saw it in asm and they gave it a good review. it also acts as a shift light

[WogsRus]

so basicaly you can't hear it at all then? Or is there some performance loss if it pings and knocks ect?

[mattymagoo22]

if your car is pinging/knocking its not good. Its something you should get checked out man. the human ear cannot hear about the first 10% of the sound that is made so if you can hear it over the exhaust pod than its pretty bad. If you got a Power FC I think there's a function where you can make it flash the engine light when its pinging/knocking???? Good luck man.

[WogsRus]

well the car is runnign stock boost and intercooler but new pod and exhaust, i am not saying my car does knock or ping, i simply WANT TO KNOW what they sound like and how to pick it ip if it does do it.

SO SOMONE tell me please.

I know what they are and what happens to the engine when it goes wrong, but HOW do it pick it up by ear.

THANKS.

BTW My safc II has a knock setting, it never goes higher then 15 or so.

Edited September 14, 2006 by WogsRus

[tmc_2]

If u can hear it pinging will sound like a box of matches ratling in the background very faint, then sever knocking is basically that, like a cylinder went knock on the side, well thats my interpretation. I drove around for 2 days wihtthe pining box of matches sound and it was real quiet so i thought it wasnt to big a deal to be urgent and then i busted a piston. ended up buying a new engine. Get it checked if your in doubt by a good workshop.

[mattymagoo22]

it sounds like hitting 2 hammers together or rattling around some washers in a tin can tink a tink tink tink.... something like that man.... makes me quiver. good luck

[Duncan]

I don't know how any of you guys can hear pinging in a turbo engine with a noisy zorst on the road.....very faint noise....

[WogsRus]

Thats my point, i have a 3.5" ehayst and a HKS pod with bellmoth intake, and at 4000rpm, no idea what is what, everything makes noise.

I have a timing light now and will check the timing this weekend.

Will pinging be notice by performance, ie losst or a miss or something

[R31Nismoid]

sounds like stones under the bonnet

almost impossible to head with a loud exhaust, if you CAN hear it, its extremely bad

get a dyno session, that will tell the stroy

[grigor]

Quote:

"SO SOMONE tell me please.

I know what they are and what happens to the engine when it goes wrong, but HOW do it pick it up by ear."

Buy some engine ears, or if you're really keen you can make a set for under $20 and 30minutes.

[Abo Bob]

Listen to a loaded up mitsubishi express van go past in a gear too low for it. That's pinging. It's a metallic kind of rattling. I can hear it in my car but my exhaust isn't that loud and I don't have a pod. It's easier to hear with the windows up.

It's the kind of sound that someone needs to point out to you. Once you know it you know it. Hard to describe otherwise.