Who`s Dowel pinning engine`s these days

[PercentSevenC]

What about for S4 turbo engines? Is it still a BS procedure?

[RICE RACING]

Originally Posted by PercentSevenC

What about for S4 turbo engines? Is it still a BS procedure?

S4 Turbo after you exceed 24psi boost (say 500bhp) on a T04 turbo has not much margin left if you have any type of misfire or detonation, these engines along with early 13B's and 12A's will benefit from some extra Dowels to share the combustion loads (or in most cases miss combustion pressure spikes!).

13B-REW and T2 S5 big boss plates need no such modifications at all.