The definitive guide to Rollerisation

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

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.

Montanarolo Posts : 20 Join date : 2022-04-13

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?

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

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

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Montanarolo Posts : 20 Join date : 2022-04-13

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

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

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.....

Montanarolo Posts : 20 Join date : 2022-04-13

Is necessary after rollerisation change softweare ECU?

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

It'll run. Just not very well.

Montanarolo Posts : 20 Join date : 2022-04-13

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?

GRiSO Capo Posts : 9255 Join date : 2013-09-30

That's not an actual crack, is it? It's not just a casting mark?

Montanarolo Posts : 20 Join date : 2022-04-13

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

Don Abbondio Posts : 5908 Join date : 2014-03-13 Age : 67

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

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

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.

GRiSO Capo Posts : 709 Join date : 2014-04-23 Age : 74

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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