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 The definitive guide to Rollerisation

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Pete Roper
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Pete Roper
GRiSO Capo
GRiSO Capo
Pete Roper


Posts : 8963
Join date : 2013-05-29
Age : 65

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PostSubject: Re: The definitive guide to Rollerisation   The definitive guide to Rollerisation - Page 2 Icon_minitime1Wed 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
Montanarolo
lizardking


Posts : 20
Join date : 2022-04-13

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PostSubject: Re: The definitive guide to Rollerisation   The definitive guide to Rollerisation - Page 2 Icon_minitime1Thu 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
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GRiSO Capo
Pete Roper


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PostSubject: Re: The definitive guide to Rollerisation   The definitive guide to Rollerisation - Page 2 Icon_minitime1Thu Apr 21, 2022 12:42 pm

Not really. It's pretty straightforward. I did write this years ago.

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lizardking
Montanarolo
Montanarolo
lizardking


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PostSubject: Re: The definitive guide to Rollerisation   The definitive guide to Rollerisation - Page 2 Icon_minitime1Sun Apr 24, 2022 2:47 am

Thank you very much. You're a genius, Pete
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Pete Roper
GRiSO Capo
GRiSO Capo
Pete Roper


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PostSubject: Re: The definitive guide to Rollerisation   The definitive guide to Rollerisation - Page 2 Icon_minitime1Sun 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
Montanarolo
lizardking


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PostSubject: Re: The definitive guide to Rollerisation   The definitive guide to Rollerisation - Page 2 Icon_minitime1Sun Apr 24, 2022 8:54 am

Is necessary after rollerisation change softweare ECU?
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Pete Roper
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GRiSO Capo
Pete Roper


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PostSubject: Re: The definitive guide to Rollerisation   The definitive guide to Rollerisation - Page 2 Icon_minitime1Sun Apr 24, 2022 1:54 pm

It'll run. Just not very well.
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lizardking
Montanarolo
Montanarolo
lizardking


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PostSubject: Re: The definitive guide to Rollerisation   The definitive guide to Rollerisation - Page 2 Icon_minitime1Today 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



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Does that often happen with these engines? I understand this means replacing the heads?
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beetle
GRiSO Capo
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beetle


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PostSubject: Re: The definitive guide to Rollerisation   The definitive guide to Rollerisation - Page 2 Icon_minitime1Today 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
Montanarolo
lizardking


Posts : 20
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PostSubject: Re: The definitive guide to Rollerisation   The definitive guide to Rollerisation - Page 2 Icon_minitime1Today 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

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Is possible that in all four tubes been identical cracks??? Is strange
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Oz1200Guzzi
Don Abbondio
Don Abbondio
Oz1200Guzzi


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PostSubject: Re: The definitive guide to Rollerisation   The definitive guide to Rollerisation - Page 2 Icon_minitime1Today at 2:41 pm

Looks like casting marks to me, but WTF would I know?
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Pete Roper
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Pete Roper


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PostSubject: Re: The definitive guide to Rollerisation   The definitive guide to Rollerisation - Page 2 Icon_minitime1Today 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
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PostSubject: Re: The definitive guide to Rollerisation   The definitive guide to Rollerisation - Page 2 Icon_minitime1Today 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!  Basketball
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