Pinging XR600

[Anonymous]

Ktmrat wrote:

Quote:

Moto all machines will have a wave(shock, sound , pressure doesn’t matter which) that will effect burn rates and even if the system was not designed around this you will still get changes no matter what when the rate of movement is altered, this may be real close as it is and thats why the thing is doing what is

A shock wave is a singularity and acts to change the properties of a material (gas in this instance) as it travels through the medium. The wave created in an exhaust pipe is caused by the periodic opening and closing of the exhaust valves. The opening and closing effect causes high and low pressure pulses within the exhaust system creating a modulating flow, or pressure wave. Since the flow of gas has an inherent (kinetic) energy, sound occurs (along with heat) as a by product of the dissipation of energy when exiting the exhaust and exposed to a step change in pressure, temperature and velocity. There is no soundwave or shockwave present.

You get a shockwave in the cylinder head when the detonation of the mixture occurs prematurely due to low quality fuel, excess heat etc. Changing the exhaust may help alleviate the issue if it has the ability to remove some of the excess heat causing detonation. This is why a high flow exhaust may help. The back pressure on the cylinder head is reduced allowing more fuel and air to be combusted and flow through the exhaust without the build up of heat (plus the fuel/air mixture acts to cool the cylinder head). The wave produced by the exhaust can only be used to suck more fuel and air through into the cylinder head when the intake and exhaust valves have an overlap and are both open for a predetermined length of time. This was the technique used to tune performance exhaust systems and is called the scavenging effect.

Looks like we may have to agree to disagree Dave. At least I’m right though :laugh:

[GregMember]

LMFAO!

Are you by chance over engineering your response there Moto :silly: , really I understand it because thats my job , but it could be put down as the flow of the new pipe is helping the combustion process and changing the whole combustion process and jetting, for normal folk!

TB

[Anonymous]

My first answer was the short version but Dave wasn’t happy about it so I wrote in more detail what happens. You complain that my posts aren’t quality, yet when I explain in detail a solution to a problem you moan too.

Is it coz I is black?

[Mick DMember]

Trailboss wrote:

Quote:

LMFAO!

Are you by chance over engineering your response there Moto :silly: , really I understand it because thats my job , but it could be put down as the flow of the new pipe is helping the combustion process and changing the whole combustion process and jetting, for normal folk!

TB

Could be that it is still pinging but the pipe is sufficiently loud enough that I can’t hear the ping anymore??LOL

[Anonymous]

Could be that. Could be that you are getting quite old now and your hearing is, shall we say ‘intermittent’?

My bad, that’s not funny…….naaaah, who am I kidding

[Mick DMember]

I just read your Julius Sumner Miller response and I must say that it was well thought out and written in such a manner a normal layman could understand it.Untill know I had never given the matter a great deal of thought and now I can hope that one night the question may come up at a trivia night and i will look as smart as you.
Good work mate. NO tongue in cheek intended.

[Anonymous]

Cheers, whoever Julius Sumner miller is? :huh: Is he a retard? :laugh:

[Mick DMember]

He coined the phrase “Why is it so?”

http://en.wikipedia.org/wiki/Julius_Sumner_Miller [img size=200]http://www.obtrailriders.com/media/kunena/attachments/legacy/images/Sumner.JPG[/img]

[Anonymous]

Disney’s ‘Professor Wonderful’ :laugh:

I look just like him though

[Mick DMember]

See the picture on the black board above his head?? That is the day he invented the KTM suspension set up I think….LOL

[Anonymous]

I’m still here! I’m having to sort ECKS’s behavoir out :laugh:

[Mick DMember]

EHHH? (THat is a post whore response LOL)

[Anonymous]

I said it because the last time I said i was leaving and made 2 extra posts you were on my case saying @i thought you were leaving’! This time I pre-empted it

[BillMember]

micknmeld wrote:

Quote:

See the picture on the black board above his head?? That is the day he invented the KTM suspension set up I think….LOL

you could fix the problem push the xr down a mine shaft and buy a KTM and get a rear suspension that a professor invented not some Jap accountant

[GregMember]

KTM Bull wrote:

Quote:

micknmeld wrote:

Quote:

See the picture on the black board above his head?? That is the day he invented the KTM suspension set up I think….LOL

buy a KTM and get a rear suspension that a professor invented not some Jap accountant

You are so Daves mate :silly: PDS suspension, ha no idea, KTM is dropping it because it doenst work, no good, ask around, ask a suspension tuner. Ask jeremy mcgrath, won an AMA on every japanese manufacturer and couldnt on a KTM because of the PDS :ohmy:
At the super X year, I watched with interest as Marmonts KTM bogged in the whoops every lap because the PDS wouldnt let the bike drive over it like the Jap bikes,its a good thing yeah :laugh:

lol OMG! LMFAO!

TB

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