318 has developed a miss?

TrailBeast said

I have to disagree with this.
If what you state is true, then why does a burned intake valve cause popping out the carb?
AND why does a lean condition cause popping out the carb, even if there isn't a burned or open valve (or closed ex valve)?

I already know the answers to the above questions, just wondering how you can say that.

OH NO, ALIENS GOT ROB!!! :toothy7:
That is the only explanation.

Click to expand...

It cannot. The popping out of the carburetor is the cylinder still firing. It cannot fire if the intake valve is burned, because that cylinder cannot build compression. However, if the exhaust valve is closed for whatever reason, bad lobe, bad lifter, bent pushrod, broken rocker, or a combination, the cylinder will still fire, but the exhaust will be routed back through the intake and out the carburetor. Disagree all you want, but that's how it works. I suppose if the intake valve is burned, it's possible to get a pop, but nothing like what I am talking about. when an exhaust valve is held closed through the exhaust stroke due to damage, the pop will be LOUD and rhythmic because it will be happening every single time that cylinder fires. You will not have a "skip" as defined by a dead cylinder, but it will run like hell, because exhaust is being routed where it does not belong.

I am not saying that's what his problem is. I am simply describing what happens when an exhaust valve doesn't open.