Big Head Studs....

[Thom]

After having the deck plate installed by ETG on my 968 block the pistons were designed accordingly and the block checked/rebored/rechecked by my friend Reiner Telkamp in Stuttgart. As a professional engine builder he checked every measurement before giving me the go ahead to assemble it. So far so good despite sometimes overboosting to 30 psi with used S2 studs of unknown mileage torqued to WSM spec... either the proof is in the pudding or I have been impossibly lucky. Probably a bit of both?

[Biggles]

Sorry I am not understanding this correctly.
You had a deck plate fitted which would cost a fair amount and required the head studs to be removed and then reinstalled the used head studs ?
OE head studs are not a lot .

[Thom]

I stripped down the donor 968 engine, brought the block+girdle assembly to ETG to have the deck plate installed, then brought the block to the engine builder for the rest of machining and measuring work. At the time of reassembly I used a set of S2 studs that were lying around, not because I was being cheap but because I wanted to verify first hand if the deck plate solved all headgasket issues that most people try to fix with big head studs and/or using higher torque figures.

[blade7]

. Gets a bit tense with an old block .
On the flip side Turbo Tim was well over 30psi on his engine with OE head studs with out issue .

The engine went pop on the engine dyno. What boost was he running when the engine was rebuilt and installed in the car?

[Biggles]

Not sure it went “pop” , just spun a bearing due to a moment of oil starvation on the dyno as I remember with the 2.7 .

[Tom]

Wasn't it Special Tool's motor that 'popped' on the dyno, with the coolant tank nearly blowing up?

[blade7]

Not sure it went “pop” , just spun a bearing due to a moment of oil starvation on the dyno as I remember with the 2.7 .

If I recall correctly, it knackered the conrod too . And after rebuilding it he turned the boost down.