can anyone explain to me what is knock??

[Guest lixid]

what exactly is knock? i found that when i run .85 bar the knock goes 12 the most. but when i run 1 bar it goes up to 55. is it normal? what is the safe level for knock.

[PranK]

sounds like pinging..

pinging is detonation... i dont know exactly what is involved with pinging, but i know its bad.

[Guest camdotcom]

ok

asi understand it...

turbo heats up air...air & fuel mix...air/manifold temp is enuff 2 combust a/f mix.

if this is incorrect, please let me know.

Cam.

[kjb_r33]

nope, its uncontrolled ignition, and it takes place entirely in the combustion chamber, that is until it blows a hole in your pistons, then it stops haha

read some here...

http://www.motorcycle.com/mo/mcrob/rt-fuel2.html

what are the figures your quoting?? there is NO safe level for knock....

[Silver-Arrowz]

Simply, when the air/fuel mix is ignited before the spark plug fires. The piston is still coming up and the mix goes off, not allowing the piston to reach top dead centre.

[Guest lixid]

thanx for replys guys...

well are there any solutions or preventions to this .....?

[red900ss]

Pinging, detonation, knocking are all the same thing. It can be very damaging to your engine. It is an uncontrolled rapid burning or explosion of the fuel air mix in the combustion chamber. Correct combustion is a slower "burning" of the fuel air mix.

It can be caused by a too lean mixture, wrong ignition timing, high compression ratio, hot spots (carbon deposits in the combustion chamber that retain heat and trigger detonation) and fuel of too low an octane rating to name a few.

I had some pinging and the guys at CAS fixed it at one of the dyno days by adjusting the timing.

As for the numbers you are quoting, I'm guessing you've got some piece high-tech trickery that senses the detonation and gives you a read out????

[Guest lixid]

yes i got a power fc which can read the knocks

well you mean low level of fuel can cause pinging(knock)??

if so that's why that happened..... my fuel level was at the very end.....

well are there any strange sound when pinging... if so what the sound like?? i heard strange sound yesterday when i drive......

if everything is right above..... i got out of the blur...... thanx guys:D

[red900ss]

Pinging sounds like a rattle when you accelerate.

It has nothing to do with the fuel level.

Take it to a workshop and go for a test drive with a mechanic, they'll point it out.

[raist60]

Anything up to 60 on PowerFC gauge is fine. Oh and by the time you hear pinging (the 'rattle') your gonna be close to 200 on the knock level

[Guest Impul 25T]

You can't normally hear 'pinging' from inside your car, unless it is really bad. Someone outside the car can hear it tho, sorta sounds like a whole lot of needles being dropped into a metal wok/pan. Not a good thing to have.

[Guest lixid]

:confused: