Aluminium head torque wrench settings.

[davidwheeler]

I have done up the head nuts to 84 Nm which is about 64ft/lb.  Does anyone know of an official setting?

[Dikappa]

I used 9 Kgm, but over the weekend spoke to Hugo Modderman, and he said it should be 12 Kgm.

It has quite big studs, so this might be true.  For my head I now made shallowed studs, the whole body between the treads is turned down to 11.5mm, the idea is that then the studs will be able to stretch along when the now aluminium head expands (more then the original cast iron one), thus keeping the gasket tight, but without compressing it over it's elasticity.
We'll see if it was a good idea or not in the future....

[davidwheeler]

9Kgm = 90Nm = 66 ft/lb
12Kgm = 120Nm = 88ft/lb
I am a bit wary of going that far for fear of pulling the studs out of the block even though I have helicoiled the holes.    I do think we used to do the old cast iron heads to this though.    My figure has always worked in the past with aluminium heads with a 3-4 mm thick compressed graphite gasket (made by Dobson Gaskets of Keighley).

[lancialulu]

Not a Lambda but a "modern Beta" cylinder head (alloy) torque is 61ftlb - bolts M10. Higher torque is danger of crushing the alloy head