Eagle rods, fail!!!!!
I think it hit something solid, I dont think this was the rod but I am not sure if it was seized oil pump and timing belt skipped or what. I am curious to see the bottom of the head.
aaron
aaron
I dont think I have ever seen a forged piston with a hole in it -- over a rod broken...
Seems to me the rod was the problem. I drove an SR20 without oil in it, boosting on the freeway to 90mph, seizing the engine abruptly, and didn't even warp my Pauter rods. The big end was black from the heat. They are in my current engine now making 500hp. It made me really nervous at first, but this motor has seen 10k rpms and gets beat to hell. I don't plan on pushing it any harder.
I don't see how detonation would brake a rod before punching a hole through the piston. The design of the rod should hold an immense amount of shock. Seems to me the metal had a weak spot in it. Detonation is harsh, but 8000+rpm has to be worse. Eagle fail on this one.
I don't see how detonation would brake a rod before punching a hole through the piston. The design of the rod should hold an immense amount of shock. Seems to me the metal had a weak spot in it. Detonation is harsh, but 8000+rpm has to be worse. Eagle fail on this one.
Just because your rods were ok doesn't mean an eagle one wouldn't have done the same.
The correct answers are-
1. 11:1 LR 2.4 piston (custom)
2. 9:1 LR 2.4 (custom)
3. 10.5:1 SR 2.4 (off the shelf)
All Wiseco.
The reason is the compression height and engineering for the headgasket we choose to use. I used them as examples since just looking at a piston is a very small part of the equation. The head could have been milled .040" (actually just saw this) and someone failed to tell the tuner that he was now dealing with a motor that was over a full point higher compression and the cam timing is advanced.
There is physical damage to the piston without valve contact evident. To me this is a valve breaking off and slamming the rod stopped. I wanna see the combustion chamber for #4 really bad.
1. 11:1 LR 2.4 piston (custom)
2. 9:1 LR 2.4 (custom)
3. 10.5:1 SR 2.4 (off the shelf)
All Wiseco.
The reason is the compression height and engineering for the headgasket we choose to use. I used them as examples since just looking at a piston is a very small part of the equation. The head could have been milled .040" (actually just saw this) and someone failed to tell the tuner that he was now dealing with a motor that was over a full point higher compression and the cam timing is advanced.
There is physical damage to the piston without valve contact evident. To me this is a valve breaking off and slamming the rod stopped. I wanna see the combustion chamber for #4 really bad.
Last edited by JohnBradley; Jul 15, 2011 at 10:28 AM.