| The definitive guide to Rollerisation | |
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Pete Roper GRiSO Capo


Posts : 8963 Join date : 2013-05-29 Age : 65
 | Subject: Re: The definitive guide to Rollerisation Wed Apr 20, 2022 2:39 pm | |
| That is the new style earthing tang. It goes under the two bolts that hold the rocker retainer late to the cambox. You discard the earlier tang.
Inlet valves have greater mass, hence the need for the increased seating pressure afforded by the shims. | |
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lizardking Montanarolo


Posts : 20 Join date : 2022-04-13
 | Subject: Re: The definitive guide to Rollerisation Thu Apr 21, 2022 9:22 am | |
| - Pete Roper wrote:
- That is the new style earthing tang. It goes under the two bolts that hold the rocker retainer late to the cambox. You discard the earlier tang.
Inlet valves have greater mass, hence the need for the increased seating pressure afforded by the shims. Thanks for the reply, Pete. Or maybe you have a something manual to get to know it before work? Or some photos? Video? | |
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Pete Roper GRiSO Capo


Posts : 8963 Join date : 2013-05-29 Age : 65
 | Subject: Re: The definitive guide to Rollerisation Thu Apr 21, 2022 12:42 pm | |
| Not really. It's pretty straightforward. I did write this years ago. [You must be registered and logged in to see this link.] | |
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lizardking Montanarolo


Posts : 20 Join date : 2022-04-13
 | Subject: Re: The definitive guide to Rollerisation Sun Apr 24, 2022 2:47 am | |
| Thank you very much. You're a genius, Pete | |
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Pete Roper GRiSO Capo


Posts : 8963 Join date : 2013-05-29 Age : 65
 | Subject: Re: The definitive guide to Rollerisation Sun Apr 24, 2022 3:49 am | |
| No! I'm anything but! All I am is someone who has filtered the sugar from the shit.
None of this rocket science. All it needs is an active interest rather than just brushing shit under the carpet to make a quid..... | |
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lizardking Montanarolo


Posts : 20 Join date : 2022-04-13
 | Subject: Re: The definitive guide to Rollerisation Sun Apr 24, 2022 8:54 am | |
| Is necessary after rollerisation change softweare ECU? | |
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Pete Roper GRiSO Capo


Posts : 8963 Join date : 2013-05-29 Age : 65
 | Subject: Re: The definitive guide to Rollerisation Sun Apr 24, 2022 1:54 pm | |
| It'll run. Just not very well. | |
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lizardking Montanarolo


Posts : 20 Join date : 2022-04-13
 | Subject: Re: The definitive guide to Rollerisation Today at 4:36 am | |
| Hello. Today I started repairing my GRiSO timing gear. After dismantling the exhaust system, I saw the following view in the heads [You must be registered and logged in to see this image.][You must be registered and logged in to see this image.]Does that often happen with these engines? I understand this means replacing the heads? | |
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beetle GRiSO Capo


Posts : 9255 Join date : 2013-09-30
 | Subject: Re: The definitive guide to Rollerisation Today at 5:05 am | |
| That's not an actual crack, is it? It's not just a casting mark?
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lizardking Montanarolo


Posts : 20 Join date : 2022-04-13
 | Subject: Re: The definitive guide to Rollerisation Today at 6:47 am | |
| - beetle wrote:
That's not an actual crack, is it? It's not just a casting mark?
I think this is a real crack EDIT: Now I remove second head and I see in inlet and outlet tubes identical damages [You must be registered and logged in to see this image.][You must be registered and logged in to see this image.]Is possible that in all four tubes been identical cracks??? Is strange | |
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Oz1200Guzzi Don Abbondio


Posts : 5908 Join date : 2014-03-13 Age : 67
 | Subject: Re: The definitive guide to Rollerisation Today at 2:41 pm | |
| Looks like casting marks to me, but WTF would I know? | |
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Pete Roper GRiSO Capo


Posts : 8963 Join date : 2013-05-29 Age : 65
 | Subject: Re: The definitive guide to Rollerisation Today at 6:06 pm | |
| I've seen it several times. On the ones I've seen they are cracks. The good news is that they don't seem to cause any further issues. The main one I would of been concerned about would be the exhaust valve seats dropping out but I haven't heard of that ever happening.
In my experience such cracks have occurred principally on engines still running a closed loop map. Is that a relevant factor? I dunno, but if the engine is ridden a lot in closed loop where the AFR is kept deliberately lean the exhaust gasses are going to be hotter and the chance of an expansion related failure is going to be more likely.
Does that theory have legs or am I just talking out of my arse? I've no idea. I'm not a metallurgist. | |
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kiwi dave GRiSO Capo


Posts : 709 Join date : 2014-04-23 Age : 74
 | Subject: Re: The definitive guide to Rollerisation Today at 8:29 pm | |
| - Pete Roper wrote:
- Does that theory have legs or am I just talking out of my arse? I've no idea. I'm not a metallurgist.
Metallurgist? It sounds to me you're a ventriloquist!  | |
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| The definitive guide to Rollerisation | |
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