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Pinging?

G

GrahamNZ

High Miler
Joined
Feb 17, 2009
Messages
618
Location
Wellington New Zealand
A few of us are complaining about pinging (pinking). While poor fuel or a real bike problerm may well be the cause, not everyone can accurately identify pinging. I'd describe pinging as a slightly irregular tinkling sound, usually heard when an engine is hot, working hard, and unhappy about it. If the sound is regular, more of a tapping or knocking, heard under load and even when an engine is cool, it may be piston-slap. If the knock lessons when the engine is hot it's almost certainly piston-slap. Knocking, even light knocking, heard while an engine is running lightly is often tappet noise or a loose bearing.

Graham
 
GrahamNZ wrote:
A few of us are complaining about pinging (pinking). While poor fuel or a real bike problerm may well be the cause, not everyone can accurately identify pinging. I'd describe pinging as a slightly irregular tinkling sound, usually heard when an engine is hot, working hard, and unhappy about it.
Click to expand...

YUP, that's what I'm hearing under a lot of accelerating conditions.

Also described as a tin can with some bolts in it being shaken.

Also described as "castanets"

GrahamNZ wrote:
If the sound is regular, more of a tapping or knocking, heard under load and even when an engine is cool, it may be piston-slap. If the knock lessons when the engine is hot it's almost certainly piston-slap.
Graham
Click to expand...

NOPE - not what I'm hearing or when ... I never hear any sound cold, it's not a knock or a regular sound....
 
duck.gif
wrote:
Quack.
Click to expand...

T,FTFY :silly: :laugh: :woohoo:
 
so what can we do when that happens? can we ask for warranty replacement? or is that something that can not be fixed? i face that pinging, ticking knocking....etc...from the first runs...i have only 600 km on a new stelvio abs 2009...while the last stelvio i had 08 model had not these problems...
 
mellinis wrote:
so what can we do when that happens? can we ask for warranty replacement? or is that something that can not be fixed? i face that pinging, ticking knocking....etc...from the first runs...i have only 600 km on a new stelvio abs 2009...while the last stelvio i had 08 model had not these problems...
Click to expand...

Well, first get it serviced properly. If it was delivered with few checkd made at pre-delivery there could be a host of reasons for odd noises. While I haven't had to do much with Stelvios yet, (Only seen one!) I haven't heard that they are prone to detonation problems if set up correctly.

You aren't trying to give it a lot of throttle at low RPM are you? That'd make anything detonate!

Pete
 
Pete: From what i've seen on my Stelvio it's kind of picky about the fuel it eats. I believe the min.octane rating recommended is 91 and even at 91, you've got to watch it at low rpm with the throttle. Sunoco here has a fuel that is rated at 94 octane and whenever I get to put 94 in it I do and it's as happy as the proverbial pig in ****.
FBC
 
As well as fuel quality and mapping issues, pinging can point to a bike being out of tune with one cylinder running leaner than the other. We know that some bikes leave the factory in less than ideal tune, and that some dealers lack the equipment and skill to tune the bikes properly.

If a bike is pinging and the fuel is known to be good, then the next thing to check is that the TPS and vacuum balance are set correctly. Ignition timing being incorrect is another but less likely cause.
 
Something I learned when my B11 was relatively new is that it required more frequent tappet adjustments and TPS resets. In other words, tune it more frequently than the manual recommends. The frequency of tunes normalized when I hit about 7,500 miles. And this is why I picked up a VDSTS from Todd. When she starts pinging, I reset tappets, TPS, and balance the TBs.
 
Noticing the same thing Nero, I've had tappets ,TPS and TBs all adjusted twice in 2300 km. Good to know it should settle down, I was told to expect it to chill out around 7000km. But one does wonder.
FBC
 
my service point said that maybe is the fuel...cause i used the fuel with too many octanes...''use the normal unleaded and it will be ok...'' but it seems that nothing works....

..so it might be the setting of the 2 cylinders ....timing...??

or worse like piston problem ?

the bike has now 750 km....new...
 
mellinis wrote:
my service point said that maybe is the fuel...cause i used the fuel with too many octanes...''use the normal unleaded and it will be ok...'' but it seems that nothing works....
Click to expand...

Although I'm new to modern motorcycles (are the new Guzzi's really "modern"???), I've been driving/riding for a long time and I've never heard of engine knock (pinging) due to using gas that was too good for the engine. It may not be necessary to use 91 Octane fuel in a motor designed for 89 octane, but it won't hurt it.

I'm sure someone will let me know if I'm wrong.

jdg
 
Heres everything you ever wanted to know, and then some.

the octane rating essentially equals the fuel's resistance to detonation (pinging).

However, the result is that higher octane fuels burn a little slower, so you may very well loose power by running 91 in an engine designed for 87.

I personally noticed an increase in performance when i use 89 in my griso, but it already pings, and using 89 makes it that much worse.

pinging is caused by several things.

when you rapidly compress a gas, it gets hot, and fast. How hot depends on the compression, and heat makes fuel explode. So, when you compress a fuel rich air mixture really fast, it gets hot. If the octane is insufficient to prevent that heat alone from blowing your fuel up before your spark does, your bike will ping. Diesel engines work on this principal alone. They have extremely high compression (running on the order of 16:1) and the heat alone lights off the fuel.

Combustion chamber hot spots will cause pinging. If you have a fuel rich air mixture, which is compressed and preheated, and then comes in contact with a very hot spot somewhere, (usually on the head, and usually on a corner) it can light off the fuel before the spark does.

If you have an engine which runs lean, (like our beloved bikes) the engine runs extremely hot. When you pin the throttle a lot, you increase the manifold pressure (until your engine speeds up), because you are trying to pull the same volume of air, through a less restrictive pipe. And thus, for the same volume of the cylinder, you get more air molecules, and more fuel to match it. As a result, the pressure inside the combustion chamber is much higher at TDC than it would be when you just cruise.

Remember that bit about rapid increase in pressure causing heat?

well, it does,. And combined with the already hot running engine, it lights off the fuel/air mix, before the spark fires.

And there you have pinging.

-Clam
 
Ressurecting this old thread to say that my final solution to a pinging B11 seems to have been a Guzzitech Reflash!
 
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