What Does Detonation Sound Like?


23 replies to this topic
  • i_wheelie_longer

Posted 08 July 2011 - 07:31 AM

#1

I am embarrassed to ask this question, but what exactly does detonation sound like? Everyone says it sounds like a pinging noise, but I have a hard time deciphering whether its just the normal pinging of a 2-stroke engine or if I am ever getting detonation. I have tried 112 octane gas and my engine sounds no different than when I'm running 93 pump gas, so I'm assuming I am not getting any detonation. Anybody care to post a video as an example?? I don't want to keep buying race gas if it's not needed.

Thanks

  • JFielder23

Posted 08 July 2011 - 08:43 AM

#2

I can't answer this with much certainty... but I have heard people say that it sounds like a rattling noise on acceleration.

  • usernamemx

Posted 08 July 2011 - 08:49 AM

#3

If its a stock bike then you don't need race gas,with the exception of one or two years of kx's I think that came w too much compression from the factory but I believe that was mid or early 90's,plus I think it was only 250's.I have a 04 yz 250 and use 93 octane 40:1

  • usernamemx

Posted 08 July 2011 - 08:55 AM

#4

I can't answer this with much certainty... but I have heard people say that it sounds like a rattling noise on acceleration.


I agree w this. I've heard it from the side of a track on a 95 cr 125 a while back, when it happend my friend said it wouldn't excelerate as fast when it hapened, but I think that was a serious case. It was really obviousthough.
When it's only an occasional knock it sounds like there is a little gremlin in your cylinder hitting it w a hammer if it's continuos like my friends the gremlin was hitting it really fast

  • etuke

Posted 08 July 2011 - 12:13 PM

#5

like a hammer tapping the engine,thats what I had with the timing too far advanced.It would happen under load for me like fourth gear accelerating

  • busted bones

Posted 08 July 2011 - 12:24 PM

#6

When my bike was pinging it sounded like a metallic ring that only happened at a certain RPM. Theres the regular ping then kinda sputtering down then another ping when youre at idle but this is constant and it definitely has a sound all its own. Almost like glass scraping against metal.

  • Valkrider15

Posted 08 July 2011 - 03:44 PM

#7

When my bike was pinging it sounded like a metallic ring that only happened at a certain RPM. Theres the regular ping then kinda sputtering down then another ping when youre at idle but this is constant and it definitely has a sound all its own. Almost like glass scraping against metal.


This is a good description. I think it also kinda sounds like a spoon stuck in the garbage disposal - Very noticable and very different than regular motor noises. Mine was detonating at 1/8 throttle under light load and good under more throttle. Working on clip position to fix it.

  • USED YZ426F

Posted 08 July 2011 - 05:41 PM

#8

Go buy yourself an '82 YZ490. Fire that mother up with the highest grade pump gas you can find, and drop the hammer.

You will know what detonation sounds like.

Otherwise, think of a loose nut banging around inside your cylinder when running under load. A metallic rattling sound that gets worse the harder the engine is working.

If your engine is stock, you don't need race gas. Premium pump gas and a quality premix will do just fine.

You would only need race gas if your engine is seriously built up. Even then, I would highly recommend you speak with the engine builder to hear what they recommend.

  • i_wheelie_longer

Posted 08 July 2011 - 05:49 PM

#9

Okay great, thanks for the detailed responses. It seems like it would be quite obvious if I was experiencing detonation, and I have not heard anything unusual. Just what I was hoping for.

  • scalejockey

Posted 08 July 2011 - 07:44 PM

#10

For the younger folks....Almost like a dry chain slapping on a hardened Honda 450R chain guide. ...but at a faster rate.

For the older fats.... As described..."A YZ490"!!

  • Street_Kleaver

Posted 09 July 2011 - 02:15 AM

#11

Like too many empty beer bottles on the floor of your car rattling when you go over bumps. "Clink clinkle clink"

:thumbsup:

  • pontiac252

Posted 09 July 2011 - 02:39 AM

#12

Some people say "Oh that's just chain slap" at low to mid rpm.
But it's not.

  • Greg Y

Posted 09 July 2011 - 09:59 AM

#13

It sounds like a bucket of silver dollars getting vacuumed out of your wallet.

  • Valkrider15

Posted 09 July 2011 - 11:12 AM

#14

It sounds like a bucket of silver dollars getting vacuumed out of your wallet.


HA! So Very True in So Many Ways!! :thumbsup:

  • LILBIT

Posted 09 July 2011 - 07:08 PM

#15

Bad=marbles rattling around in the jug

Mild=more of a pinging noise

  • RCannon

Posted 10 July 2011 - 06:08 AM

#16

I always pictured it as a ball-peen hammer tapping the top of the head. It sounds like metal to metal contact more so that grinding. Its also one of those things......if you THINK you hear it, you are hearing it..

  • KX250Fmotoracer

Posted 10 July 2011 - 09:12 AM

#17

Like a bunch of pennies are rattling around in your engine

  • argclh6670

Posted 29 May 2013 - 06:53 PM

#18

Like too many empty beer bottles on the floor of your car rattling when you go over bumps. "Clink clinkle clink"

:thumbsup:


Hahaha....

  • adam8781

Posted 29 May 2013 - 08:59 PM

#19

try mixing in a bit of race fuel to see if it stops, if you go 50/50 pump and race and it goes away, its detonation, if it doesnt than its a normal engine sound

  • 1dunc

Posted 30 May 2013 - 09:24 AM

#20

I have been running 1/4 race gas and that keeps it quiet. But is a needle position change able to cure this??
It's an 06 with V3 reeds and run excellent.





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