Rocker put a hole in valve cover

[Ultramaroon]

Originally Posted by guybo

Yeah, not thinking that an engine not designed for FI that throws a rocker out of the head MAY be related to the supercharger is pretty dumb. When you blow an engine you are increasing the pressure inside the cylinders, this increases how hard it is to push those valves which is done indirectly by.... the rockers. Maybe that's a weak point, but I can guarantee that they don't normally go on a NA engine at 30k miles.

You supercharged your car that was designed for NA. The engine expired at 30k miles. Not coincidence IMHO. I agree with @Pat 100%.

BTW, I appreciate your input. My high-level guess is that there would be somewhere between 3 and 10 BAR difference in pressure. I am not totally guessing but just jumbling figures in my head. 3 BAR is significant but here's the catch.

The fix is exactly the same.

[bfrank1972]

Jeez, just read through this thread, as an impartial viewer I'd say:

"You guys are all over the fucking map." (aggressive)

"You're evading the question. You said other factors were at play. Like what? More importantly, how? What's your theory?" (aggressive, accusatory)

responded to with: "If someone can prove to me somehow that it is impossible the forced induction could be a factor, I'm all ears." (I personally don't read anything into that)

followed by: "Ok, so you don't know and you want someone to spoon feed you. Got it.



Haha... ok Do you know how to do the math? Let's start by assuming a typiclal thermal efficiency of about 20%. Do you get why we need to know that? Shall we continue?

See, you and Pat need to be invested in this little exercise. Otherwise I'm just being suckered into doing enough math to prove my point. Can you do the math to prove yours?" (condescending)

Soooo....sorry, but who pissed in your cereal this morning? Guy is just pointing out that add FI puts additional stress on the system - I'd say it's possible. Fi=increased heat, who knows what the oil temp/viscosity was. Heck FI can also = bouncing off the rev limiter harder because the dang thing accelerates so much faster in 1st gear

[Ultramaroon]

Originally Posted by bfrank1972

Jeez, just read through this thread, as an impartial viewer I'd say:

"You guys are all over the fucking map." (aggressive)

"You're evading the question. You said other factors were at play. Like what? More importantly, how? What's your theory?" (aggressive, accusatory)

responded to with: "If someone can prove to me somehow that it is impossible the forced induction could be a factor, I'm all ears." (I personally don't read anything into that)

followed by: "Ok, so you don't know and you want someone to spoon feed you. Got it.



Haha... ok Do you know how to do the math? Let's start by assuming a typiclal thermal efficiency of about 20%. Do you get why we need to know that? Shall we continue?

See, you and Pat need to be invested in this little exercise. Otherwise I'm just being suckered into doing enough math to prove my point. Can you do the math to prove yours?" (condescending)

Soooo....sorry, but who pissed in your cereal this morning? Guy is just pointing out that add FI puts additional stress on the system - I'd say it's possible. Fi=increased heat, who knows what the oil temp/viscosity was. Heck FI can also = bouncing off the rev limiter harder because the dang thing accelerates so much faster in 1st gear

That rocker arm was going to fail regardless. That's my point.

I stand by my reaction. Maybe I'll change my mind tomorrow but I doubt it. Passive aggressive manipulation is bullshit.

[Ultramaroon]

Originally Posted by Ultramaroon

Look, If you want to learn, ask politely. Don't come in acting like you have some secret inside info.

I'm happy to share.

Originally Posted by bfrank1972

Jeez, just read through this thread, as an impartial viewer I'd say:

I quoted myself because I feel that this is my overarching theme.

Telling me I'm ignoring anything is no way to start a dialog. My first post in this thread was not intended to start any dialog nor was I singling out anyone. I was trying to be direct (and dramatic for effect) to refocus the thread.

[Pat]

That's why I said read carefully. I stand behind my statement that you MAY be ignoring the root cause. There is a possibility of that. That doesn't make you lazy, dumb or anything else you may have assumed. I did not imply anything other than there might be something else going on.
If I hurt your feelings, I'm sorry. That was not my intent. I'm simply trying to encourage people to consider the possibility that there may be more than one possible explanation to the problem. I'll just leave this post with that and wish leets4uc3 good luck in finding a resolution.

[Ultramaroon]

Originally Posted by Pat

That's why I said read carefully. I stand behind my statement that you MAY be ignoring the root cause. There is a possibility of that. That doesn't make you lazy, dumb or anything else you may have assumed. I did not imply anything other than there might be something else going on.

Of course it doesn't make me lazy or dumb. This isn't about me. I have officially led the horse directly to the water.


OP, best wishes. Can you keep us posted as you fix? Wondering what else the rocker took with it.

[leets4uc3]

Originally Posted by Ultramaroon

Of course it doesn't make me lazy or dumb. This isn't about me. I have officially led the horse directly to the water.


OP, best wishes. Can you keep us posted as you fix? Wondering what else the rocker took with it.

Thanks for the entertainment haha. I'm hoping it's not too bad. I have a guy who can do the work but he usually does big V8s. I will pull the motor soon and let everyone know what I find.

[Tokay444]

Originally Posted by Pat

Don't you think the addition of a supercharger may have caused the engine to run outside of it's designed parameters?

Not at the rocker I don't.

[Tokay444]

Originally Posted by guybo

Yeah, not thinking that an engine not designed for FI that throws a rocker out of the head MAY be related to the supercharger is pretty dumb. When you blow an engine you are increasing the pressure inside the cylinders, this increases how hard it is to push those valves which is done indirectly by.... the rockers. Maybe that's a weak point, but I can guarantee that they don't normally go on a NA engine at 30k miles.

You supercharged your car that was designed for NA. The engine expired at 30k miles. Not coincidence IMHO. I agree with @Pat 100%.

Lol!

[Tokay444]

It looks like the exhaust side rocker, so there isn't even any boost trying to force the valve open, not that you could ever make enough to overcome the spring anyway. That being said, all boost is going to do is push the valves into the seats. No added stress at the rocker.

[Ultramaroon]

Originally Posted by Tokay444

It looks like the exhaust side rocker, so there isn't even any boost trying to force the valve open, not that you could ever make enough to overcome the spring anyway. That being said, all boost is going to do is push the valves into the seats. No added stress at the rocker.

Mmmm... actually the stress at the rocker is felt in reaction to the valve spring. If combustion chamber pressure works to keep the valve shut, then the greater the pressure the more force there is required to open it. I think it does a little but not nearly enough for it to be a showstopper.

[Tokay444]

Originally Posted by Ultramaroon

Mmmm... actually the stress at the rocker is felt in reaction to the valve spring. If combustion chamber pressure works to keep the valve shut, then the greater the pressure the more force there is required to open it. I think it does a little but not nearly enough for it to be a showstopper.

Taking into consideration when the exhaust valve opens, it's not combatting much in the way of cylinder pressure at all. In fact, for scavenging to work, it actually opens in a slight vacuum nearing the bottom of the power stroke.

[Ultramaroon]

Originally Posted by Tokay444

Taking into consideration when the exhaust valve opens, it's not combatting much in the way of cylinder pressure at all. In fact, for scavenging to work, it actually opens in a slight vacuum nearing the bottom of the power stroke.

Does it? o.0

The vacuum to which you're referring is downstream of the valve. It has to open up against that - like lifting your hand off of a shop vac hose.

Or am I missing something? Honest question.

[bfrank1972]

I'd be more inclined to think engine temp/lack of oil pressure would be a culprit.