my engine blew....any thoughts and help?
That's still just crazy how cast iron ends up with a hole the size of a baseball in it. I wonder what the new 4B11 will look like when I see the first Evo X "I blew my motor" thread.
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thanks guys...now im getting a general idea of the problem....SO,
rod bolts were my problem...now i know......and now that i know wut it was that caused the problem, i can literally see that action unfold slowly in my head.....
kinda like that spike tv commercial where a UFC fighter got knee'd in the face, up against the fence, played in slow motion playing that song "This Is A Man's World" by James Brown
only in my situation.................aaahhhh! nevermind
but hey time for a build up....or purchase a fully built motor
rod bolts were my problem...now i know......and now that i know wut it was that caused the problem, i can literally see that action unfold slowly in my head.....
kinda like that spike tv commercial where a UFC fighter got knee'd in the face, up against the fence, played in slow motion playing that song "This Is A Man's World" by James Brown
only in my situation.................aaahhhh! nevermind
but hey time for a build up....or purchase a fully built motor
The OEM torque to yield rod bolts it seems from the above posts have a rpm limit where forces of inertia exceed the clamping force.
The bolts are stretched on when installed at manufacture. I'm curious what this clamping force is and most of all, the rpm required to overcome it. Is there any one capable of doing that math? This would confirm the need for ARP rod bolts.
On the other hand all that would be needed to have a bolt stretch under normal use is excessive friction while torquing the bolts resulting in less clamp pressure
The bolts are stretched on when installed at manufacture. I'm curious what this clamping force is and most of all, the rpm required to overcome it. Is there any one capable of doing that math? This would confirm the need for ARP rod bolts.
On the other hand all that would be needed to have a bolt stretch under normal use is excessive friction while torquing the bolts resulting in less clamp pressure
The OEM torque to yield rod bolts it seems from the above posts have a rpm limit where forces of inertia exceed the clamping force.
The bolts are stretched on when installed at manufacture. I'm curious what this clamping force is and most of all, the rpm required to overcome it. Is there any one capable of doing that math? This would confirm the need for ARP rod bolts.
On the other hand all that would be needed to have a bolt stretch under normal use is excessive friction while torquing the bolts resulting in less clamp pressure
The bolts are stretched on when installed at manufacture. I'm curious what this clamping force is and most of all, the rpm required to overcome it. Is there any one capable of doing that math? This would confirm the need for ARP rod bolts.
On the other hand all that would be needed to have a bolt stretch under normal use is excessive friction while torquing the bolts resulting in less clamp pressure
I would like to know the answer to this too. But I doubt it would be that simple to just put a number on it (not like the equation would be simple) but in this type of situation there are usually so many other factors.
Lets think for a second though. From what I understand, factory rev limit is set to 7400. When many tuners flash your ecu, often times they move the rev limit to 7800. So my guess is it must be around that 8200 rpm range...
Lets not forget that his motor may have simply had a defective rod bolt. Always a possibility.
So is this the general consensus. Rod bolt failure? Whether it was stretched or defective? And like stated before, if it were not defective, what rpm does this sort of thing happen on a stock motor?
My next trip up I'll be having you guys installing some rod bolts...
ARP Con Rod bolts were one of my first mods, recommended by Dynoflash. Pruven Performance was able to install them by dropping the oil pan, so it wasn't that expensive. I'm always bouncing off the rev limiter in 1st gear at autocross events, and I've been trouble-free for 4 years. My condolences to the OP - good luck with your rebuild.