Push rods are sticking through the rocker arm

[Turbo1dr]

How can detonation cause the push rods to go through the rocker arm? An engine can only detonate when both valves are closed. I think it was caused by high pressure roller cam springs.

 

[turbofabricator]

With SEVERE detonation, the cylinder pressures are so high that the valves are being held shut with high pressure. If you look at a rocker arm on the exhaust side of a Top Fuel engine, you will see a rocker that is capable of having to open up aginat 2,000 psi of cylinder pressure when the exhaust valve opens. Like I posted earlier, I have seen BOTH push rods bend into an "S" on number three. Rocker geometry/spring rate is most likely the cuase here though, in retrospect.

 

[Boost231]

wow never thought about that. good post.