With a stuck valve you have no fuel going in or out of the cylinder. It can't backfire. Backfiring through the exhaust is unburnt fuel igniting in the exhaust system. Through the carby is timing. It will miss with a stuck or burnt out valve.
With a stuck valve you have no fuel going in or out of the cylinder. It can't backfire. Backfiring through the exhaust is unburnt fuel igniting in the exhaust system. Through the carby is timing. It will miss with a stuck or burnt out valve.
Nope, not always (but I do understand your reasoning), but it will pop through the exhaust with a burnt exhaust valve or seat (badly recessed). I've seen a burnt and split exhaust valve in a low comp 308 run almost as smooth as silk yet pop like crazy out of the exhaust. As I pointed out my own 308 had a riding valve that wasn't quite closing properly a few weeks ago (after sitting for quite some time). The guides had been done 10-12,000km ago (which equates to about 7 years ago the way I was using the ute). It freed up with a gentle persuasion and getting the engine up to temp, but I was getting close to pulling the heads off again....Originally Posted by wbute
Nunc est bibendum...
Not if it's the exhaust valve that's stuck open. In that case a lot of fuel will go straight out the open exhaust valve into a hot pipe and burn in the exhaust system before the spark plug can fire it.
Vans.... This is the 2nd time round the block, 40 years later! talk about turning back the clock!
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