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Ratteling engine noise GSX 1100 1981 only then cold

  • Thread starter Thread starter kz
  • Start date Start date
cspencer said:
Mine passed emissions and now I am trying to get it to run better.
Click to expand...

Motorcycles are exempt from emissions testing here in BC. Where are you?
 
Just a word about engine noise when cold. I'm not a metalurgist, but do know something of physics, so I'll try to explain this in a way I that makes sense to all of us.

We probably all know that materials, metals in particular, expand when heated and contract when cold. Well, different materials expand and contract at different rates - called coefficients of expansion. Let's take two in particular, steel and aluminum. (Please keep in mind that there are all kinds of different alloys in each category and each has a modified set of coefficients - I'm keeping this conversation general). Steel has a coefficient of expansion of 15-18 millionths per degree C. Aluminum is in the range of 18-23.

Now, engineers, when they design an engine, set the tolerances and dimensions at an operating temperature. Since from the coefficients above we can see that aluminum expands faster than steel, (larger coefficient) so at low temperatures the tolerances are greater. (If the tolerances were tighter at low temperatures, then when the engine warmed up it would sieze). This tends to explain why at lower temps the engine makes more noise.

Another fact to consider. Forged pistons and cast pistons hav different coefficients of expansion also. This is why forged pistons make more noise than cast at lower temperatures.
 
One suggestion for you. Try a manual camchain tensioner it may not totally remove the noise but it may help a lot.
Dink
 
Sound can be deceiving and it echos. I had a rattle once years ago and it ended up being in the tranny.
 
Jon Kramilius said:
Sound can be deceiving and it echos. I had a rattle once years ago and it ended up being in the tranny.
Click to expand...

Jon,

Thanks for your answer, but I don't understand the word "tranny" could you explain to a Swede please?
 
Dink said:
One suggestion for you. Try a manual camchain tensioner it may not totally remove the noise but it may help a lot.
Dink
Click to expand...

Hi Dink,

Have dismounted the Cam tensioner and it seems too work as it should, if I turn the cam tensioner while running (I know I have to adjust it afterwoods and that I shouldn't do that during running).

It has no influence on the noise.
 
kz said:
Jon Kramilius said:
Sound can be deceiving and it echos. I had a rattle once years ago and it ended up being in the tranny.
Click to expand...

Jon,

Thanks for your answer, but I don't understand the word "tranny" could you explain to a Swede please?
Click to expand...
It is what trails behind a woman i think??? always shifting up and down
 
Have you tried a mechanics stethescope to pinpoint were the rattle is coming from? If you can find one that is amplified with the headphones use it they work great.
 
skip[ said:
Have you tried a mechanics stethescope to pinpoint were the rattle is coming from? If you can find one that is amplified with the headphones use it they work great.
Click to expand...

I have tried with a sreewdriver and always thought it was the cam chain.

Now, I must say i believe you guys, that it is nothing to worry about, and will keep on driving, maybe the bike has forged pistons??

BTW:

After all, it is my brothers bike, and I got him to post at least one post here and say thank you to you all for your replys.

BTW2:

My GS 1150 doesn't have rattle at all (in comparisament) and my GS 1150 has approx. twice the milage as my brothers bike, really big difference actually.....
 
Re: Ratteling engine noise GSX 1100 1981 only then cold

hassez said:
Hi all of you Im KZ?s brother (whit the rattling noise in the engine), thanks for all your replys.

Phil, no it?s all the time when it?s cold and I dont have a have a starter chain.
As I can understand I will continue drive the bike as it is.
Click to expand...

All the GS's I have owned made some camshaft noises when cold. Some more, some less.... Sounds like a staccatto (spelling?) noise, like a train on rails. It comes free with a GS; enjoy it! 8O :lol:

Welcome Hans! Another European on the Forum! Hope to hear more from you in the future! :D
 
Lyssna inte f?r mycket p? Slowpoke, han snackar s? mycket strunt att han inte vet n?r det ?r allvar eller inte..... :lol:

(Not to worry Scotty, just told him a bit about your personality... :wink: )
 
Tjena biker66,

Kan ligga n?t i det, men han har ju absolut flest inl?gg. :D

Om du syftade p? "tranny" har jag listat ut att det ?r v?xell?dan, han mailade mig faktiskt och f?rklarade.

Du som har h?llt p? en hel del med GSX:er...

Vad tror du sj?lv om rasslandet?

?r det bara att k?ra vidare och se glad ut?


Not to worry Scotty, just asked him a bit about your personality... :wink:


So much easier to write in Swedish, the problem is that the replys are a little bit more limited.... :roll:
 
kz said:
Jon Kramilius said:
Sound can be deceiving and it echos. I had a rattle once years ago and it ended up being in the tranny.
Click to expand...

Jon,

Thanks for your answer, but I don't understand the word "tranny" could you explain to a Swede please?
Click to expand...

Sorry to take so long to reply but I've been busy as heck at work lately. Tranny or transmission is what I was meaning. Forgive me, I'm just a poor Lithuanian lost in Canada... :)
 
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