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Old 08-20-2012, 12:03 PM   #4396
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That thing ate something. That is not detonation. Looks more like a piece of bearing/other foreign metal or glow plug element.
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Old 08-20-2012, 12:05 PM   #4397
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How is the conrod's big end? Have you checked the small end to make sure no pieces are missing? There seem to be marks on the conrod as well, close to the piston's skirt.
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Old 08-20-2012, 12:38 PM   #4398
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Default Novarossi .12

I want to know what nova .12 is the best for the money? Please help
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Old 08-20-2012, 12:41 PM   #4399
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I want to know what nova .12 is the best for the money? Please help

IMO, can't go wrong with the flash .12


My other choices would be the Mega ZX12 DSII and the Picco JLR Evo3.
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Old 08-20-2012, 04:41 PM   #4400
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I'm looking for a 35 plus 21 head button...if anyone has an extra or even a used one pm me

Thanks

John
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Old 08-20-2012, 04:50 PM   #4401
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Originally Posted by Wachsmann64 View Post
How is the conrod's big end? Have you checked the small end to make sure no pieces are missing? There seem to be marks on the conrod as well, close to the piston's skirt.
Now, I can see some scratch on the conrod which close to the piston's skirt.
Maybe some piece parts can makes this accident.
I will check all parts of engine and I will exchange the conrod to new one.

Thanks.
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Old 08-20-2012, 04:55 PM   #4402
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No damaged at the side of the piston, I would say if you did not have a blown plug or a broken ball from a bearing it must be a to low head clearance. First of all check the play on the main bearing and conrod. If that is all OK then you must add at least 0.5mm of headshims.....
Bearing are seems OK, but I can feel some play on conrod.
I will exchange the conrod to new one.
And then I will test this engine with more shims.

Thanks.
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Old 08-20-2012, 05:21 PM   #4403
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Ever seen the result of a pre-detonation? That looks more like it was sandblasted, this is not. And the moment has nothing to do with the opening of the exhaust.
Normally you get the ignition just before TDC and because there is a slow reaction the combustion after TDC. With pre detonation the combustion will start just before or on TDC making a uge pressure.

This looks like dirts from somewhere or I would say a to low head clearance.
I can find some scratch on conrod by Wachsmann64's help.
So, as you said, I think, it means some dirts from somewhere make scratch not only the conrod but also piston & under-head.

I will check every parts of my engine and make them clean again.

Thanks.
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Old 08-21-2012, 04:33 AM   #4404
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IMO, can't go wrong with the flash .12


My other choices would be the Mega ZX12 DSII and the Picco JLR Evo3.
the picco evo3 conrod always bring problem
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Old 08-21-2012, 07:39 AM   #4405
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for a new break-in Keep-On .12, does anything else need to be done before it can be raced?
anybody...
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Old 08-21-2012, 08:22 AM   #4406
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anybody...
Idle one tank, then run it on the track at a rich setting for a couple tanks. Then start race tuning.
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Old 08-21-2012, 08:25 AM   #4407
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Idle one tank, then run it on the track at a rich setting for a couple tanks. Then start race tuning.
cool, thanks.
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Old 08-25-2012, 05:50 AM   #4408
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hi.there is a back plate with steal insert for 11.5mm crankcase 12 novarossi engine?i have seen engines with that type of backplate but they are for 11.9mm crankcase.
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Old 08-25-2012, 11:30 AM   #4409
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hi.there is a back plate with steal insert for 11.5mm crankcase 12 novarossi engine?i have seen engines with that type of backplate but they are for 11.9mm crankcase.
Back plate with steal insert? What would the steal insert do?

Kindest regards,
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Old 08-25-2012, 12:20 PM   #4410
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Make less scratches on the aluminium part
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