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 Engine head knocks problem

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motografando
Grignapoco
Grignapoco
motografando


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Join date : 2023-10-26
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PostSubject: Engine head knocks problem   Engine head knocks problem Icon_minitime1Thu Aug 01, 2024 5:41 am

Hi everyone
my bike (1100) starts having some head knocks since summer has arrived.
Here temperatures and humidity are quite high.
knocking is located in the left cyl between 3k and 4k rpm.
I remapped ECU with beetle map (tnx mark!), the bike feel generally better, but at the moment knocks are still here, maybe a little reduced. [You must be registered and logged in to see this image.]

I'm thinking about trying to change main spark plugs (now i'm running with bpr6es which are the original ones) with colder bpr7es, leaving inner sparks (the iridium ones) untouched.
Can be a good idea? Someone has similar experiences?

Thank you in advance.
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Pete Roper
GRiSO Capo
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PostSubject: Re: Engine head knocks problem   Engine head knocks problem Icon_minitime1Thu Aug 01, 2024 3:54 pm

Has it done this in previous summers? Are you certain it is detonation?
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motografando
Grignapoco
Grignapoco
motografando


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PostSubject: Re: Engine head knocks problem   Engine head knocks problem Icon_minitime1Thu Aug 01, 2024 11:35 pm

this is the first summer i've the GRiSO.
yes i'm sure, is the typical pinging sound, it come from left cyl while under acceleration between 3 and 4k rpm.

Yesterday i checked the sparks...the black one is from left cyl. They have 7500km.
To me they seem not to be overheated, at least quite lean
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Pete Roper
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PostSubject: Re: Engine head knocks problem   Engine head knocks problem Icon_minitime1Fri Aug 02, 2024 3:36 am

I doubt it’s a plug issue but first step is to replace all four. No point in going half way.

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GuzziSteve
Fra Cristoforo
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PostSubject: Re: Engine head knocks problem   Engine head knocks problem Icon_minitime1Fri Aug 02, 2024 9:08 am

On the main plugs you may want to change brands. This 1100 G that I built for a friend did the same but it was built to extreme. He went from the NGK to Champion N7YC and it stopped. Just an idea.
Maybe just a sync & reset TPS. Good Luck & listen to Pete!

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motografando
Grignapoco
Grignapoco
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PostSubject: Re: Engine head knocks problem   Engine head knocks problem Icon_minitime1Fri Aug 02, 2024 11:02 am

Thanks guys, i m also not conviced that's a plug-temperature related issue but indeed is a simple and low cost idea.
Btw today i checked original sparks electrodes distance and i found it out of spec. So i cleaned them and re-set to 0.65mm.
I ve read also a (very old)pete's post about incorrect engine temperature reporting by the probe on the right cyl, so i disassembled it and fulfilled the hole with loctite 8104 silicone grease. I bought 7-grade sparks but not tried for now. I ll keep you informed 😊

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lcjohnny
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PostSubject: Re: Engine head knocks problem   Engine head knocks problem Icon_minitime1Sat Aug 03, 2024 5:40 am

I would also recommend you check that both headers are tightly bolted to the head. When they start to blow they can hammer every time a pulse of exhaust gas exits the cylinder. This starts happening at peak bmep just when pinking happens and a leaky exhaust can make an engine run lean.

Obviously slacken the clamp before you tap the header pipe back then tighten the 2 exhaust studs.

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motografando
Grignapoco
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PostSubject: Re: Engine head knocks problem   Engine head knocks problem Icon_minitime1Sat Aug 03, 2024 9:20 am

Went out for a quick ride with oven-like temperatures and no pinging. 😁
We'll see in the next days what will happen.

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GuzziSteve
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PostSubject: Re: Engine head knocks problem   Engine head knocks problem Icon_minitime1Sat Aug 03, 2024 3:22 pm

Tempermental lil talian bitch! Sorry couldn't help myself.
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voulga77
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PostSubject: Re: Engine head knocks problem   Engine head knocks problem Icon_minitime1Sun Aug 04, 2024 1:16 am

Dear motografando, I would do a propper throttle body balance. Between 3500-3750 k, engine not too hot (80-90C).
I find my Breva to be very sensible to that, When balance is spot on, pinging disappears.

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motografando
Grignapoco
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PostSubject: Re: Engine head knocks problem   Engine head knocks problem Icon_minitime1Sun Aug 04, 2024 6:33 am

As i wrote in my prev message, tbs were alteady balanced. I dont want to touch'em until the next cleanup 😁
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motografando
Grignapoco
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PostSubject: Re: Engine head knocks problem   Engine head knocks problem Icon_minitime1Sun Aug 04, 2024 6:34 am

GuzziSteve wrote:
Tempermental lil talian bitch! Sorry couldn't help myself.

I dont understand Razz
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