Closed exhaust valve = damage to bottom end?

[LORD_GORDO_BOOST]

So my head fucked up and my exhaust cam broke after the third cylinder (pictures attached) So ive driven it no more than 10 miles without knowing wtf happend just knew cylinder 3 was gone, I know its stupid but I needed to get to work. So my buddies tell me I just need a new cam and to tap and redrill where the bolts go and no need to take off the head. Is that correct? Im thinking if the exhaust valves arent opening can that cause damage to my rings aswell? Noob question, I know.

[zurud]

If your cam broke while the engine is running, you have big problem coming at you. Bent valves is guaranteed. Rebuilt or used engine is going to be on your next budget now.

[LORD_GORDO_BOOST]

should i expect a bottom end rebuild aswell or will i do with just a top end?

[mechanicalmoron]

If the cam broke with the valve closed, the valve could be fine. Put a new cam on, and do a compression test.

Then again, yeah, I can see a stuck exhaust valve being bad for the bottom end, but maybe not, if it was pushing the exhaust back into the intake it couldn't have been getting fresh air, and thus not much power on that cylinder. (hope your injector's okay, having been in that proximity to exhaust)

Try it and see. But obviously, don't try to run it until it's at least got a new cam.

[jacobs13]

Ive got some cams in long beach if you need them. Also have a built head if yours got damaged. You didnt hear this happen? I think you definately would have heard some banging if the valves hit. You can do a leak down in as is condition just make sure the valves are closed on that cylinder. That way you will know right away if you need to do a rebuild.

[LORD_GORDO_BOOST]

If the cam broke with the valve closed, the valve could be fine. Put a new cam on, and do a compression test.

Then again, yeah, I can see a stuck exhaust valve being bad for the bottom end, but maybe not, if it was pushing the exhaust back into the intake it couldn't have been getting fresh air, and thus not much power on that cylinder. (hope your injector's okay, having been in that proximity to exhaust)

Try it and see. But obviously, don't try to run it until it's at least got a new cam.

thank you, im gonna be on the look out for a new set of cams and possibly a head. I might open it up this weekend and check the injectors aswell

[LORD_GORDO_BOOST]

Ive got some cams in long beach if you need them. Also have a built head if yours got damaged. You didnt hear this happen? I think you definately would have heard some banging if the valves hit. You can do a leak down in as is condition just make sure the valves are closed on that cylinder. That way you will know right away if you need to do a rebuild.

nope I didn't hear any banging. I was at about 6k when I felt the loss of power. I've never done a leak down test. im gonna look in to it and probably handle it this weekend. Can you PM pictures of the head?

[speedfiend]

You might be in for a whole lot more then just a new head and cam. If the cam broke and had any of the valves open then there is a good possibility that the valves made contact with the tops of the pistons. Especially since you drove around on it afterwards. Just look close at the tops of all your pistons and make sure none of the valves hit. If you have valves that are bent and stuck partially open then I can almost guaruntee you that valves made contact with the pistons. Your injector should be fine. Also if none of the valves hit the pistons then the bottom end should be fine. Just do a compression check, when you get it back together with the new cam, just to double check.
Cameron

[mechanicalmoron]

thank you, im gonna be on the look out for a new set of cams and possibly a head. I might open it up this weekend and check the injectors aswell

Well that was just an afterthought, in a scenario that would save everything but the cam. If you fix the cam and it runs fine, no need to worry about it.