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Thread: detonation or spark knocking ??

Created on: 06/05/16 04:50 PM

Replies: 31

Palmer812


Palmer812's Gravatar

Location: North Carolina

Joined: 08/06/11

Posts: 60

RE: detonation or spark knocking ??
06/07/16 7:01 PM

Update. It was over 90 Saturday when I rode it home from the dealer. This morning on the way to work it was 70 and I loaded it down a few times with no issues. Also no issues up to 6k. On the ride home it was 80 and no issues up to 6k. It did knock a little under a heavy load but not as bad. When I say up to 6k I let off at 6k still trying to be easy on her. Also the Turbo Blue at the local station is 100 octane unleaded. I might go top off with it and call it a day.

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Rook


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Joined: 03/28/09

Posts: 21238

RE: detonation or spark knocking ??
06/07/16 7:23 PM

The temperature might have something to do with it. These bikes run hotter when brand new.



08 MIDNIGHT SAPPHIRE BLUE ZX-14 Now Deceased, will be resurected 2024 ZX-14R bran friggin NEW!

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Palmer812


Palmer812's Gravatar

Location: North Carolina

Joined: 08/06/11

Posts: 60

RE: detonation or spark knocking ??
06/11/16 5:07 PM

Well, definitely had bad gas. I rode to work everyday this week but it is only 2 miles each way so still just 94 miles on her. Yesterday on the way home I stopped and put in 2 gallons of the Turbo Blue 100 octane unleaded. Today when I left work it was 94 outside, the hottest it has been all week. I tried gassing it at 55 in 6th gear and it did perfectly fine. No knocking at all. When I turned on my road I went to 6th. gear at 35 and nailed the throttle with the same results. It bogged a bit and took off no knocking or pinging. And as a bonus it smells so damn good now too. lol

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Hub


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Joined: 02/05/09

Posts: 13917

RE: detonation or spark knocking ??
06/11/16 5:43 PM

When I turned on my road I went to 6th. gear at 35 and nailed the throttle

Bad boy! 12:1 compression ratios, 261 psi is max book. Last thing you want to do is that kind of abuse to the 12:1's. However, the best part of this is it's not my bike. Here's the damage done.
So I heard this knock when I was hacking the bike.
The dome of the piston had this perfect V. This is for the lathe kind of cut one piston to size.
The scope was also looking at cylinder walls too. So here we are pre-knock with the V notch.
The knock comes, I check again with the scope. The V looked like the moon with welded balls stacked next to each other.
The peak kinetic is right before TDC and that melts piston material, if not vaporizes it or down the cylinder wall are the scratches.

Signed,
NOLTT



Tormenting the motorcycling community one post at a time

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Palmer812


Palmer812's Gravatar

Location: North Carolina

Joined: 08/06/11

Posts: 60

RE: detonation or spark knocking ??
06/11/16 6:04 PM

lol. I only twisted the throttle for just a second just to see if it knocked or not. I usually don't even go above 4th gear unless on a 55mph or higher rd.

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rod442


rod442's Gravatar

Joined: 05/01/12

Posts: 467

RE: detonation or spark knocking ??
06/12/16 11:36 AM

As Hub said, STOP loading up the bike with heavy throttle and no rpm's. Its hard on parts, bearings, etc. and no real reason to do it.

Hell, I'd say its harder on the motor to do that trying to stay below the "recommended break in" 4-6K rpm, than it is to use light throttle and have the rev's above 6K seat the rings better.

NOW, I'm not saying run the piss outta it; but varying the rpm's at light throttle (15-40%?) wont break the darned thing. Gradually use the lower gears to run the rpm's higher and higher until you feel comfortable running it at 6-8K rpm's. Then start using heavier and more throttle to run it harder and use more rpm... on acceleration AND then let it decelerate. A few hundred more miles and there you go; engine's broken in. change the oil a time or two in that 500 miles and your good.

I did that exact thing on the ride home from the dealer, around 50 miles and then on the next couple rides until I had 250-300 miles on it. Changed the oil, then ran it a bit harder until about 700, and then it was game on.

ALSO on any road that was steady cruise constant throttle (freeway) I was ALWAYS shifting up and down through the gears 3-6. That way even if my speed was the same, I was using more and more rpm to break in the rings.

PS glad it was just some bad gas.


* Last updated by: rod442 on 6/12/2016 @ 11:38 AM *

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Hub


Hub's Gravatar

Joined: 02/05/09

Posts: 13917

RE: detonation or spark knocking ??
06/12/16 1:08 PM

Ah, speaking about rod speaking about bearings, I forgot to mention that. The detonation is like a hammer and so this squishes the soft aluminum bearings out of the top bearing half. The proverbial rod out the case down the road. You'll thank rod later as to the capital letters of STOP abusing the bike and wipes the sweat off the brow is a sigh of relieve it's not my bearing squish.



Tormenting the motorcycling community one post at a time

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