Snapped Valve

[edd344]

If an intake valve was to snap, so in effect either air or fuel is permanently entering a cylinder, would the engine still turn over, if so what would happen?

[Boosted LS1]

It would probably jam itself into the piston crown and make the engine very difficult to turn over.

[Old Merc]

If an inlet valve snapped the engine would destroy itself.

[stevieturbo]

Boosted LS1 said:

It would probably jam itself into the piston crown and make the engine very difficult to turn over.

Or very fast to turnover once everything is fked and there's zero compression lol.


But any notion that fuel would permanently be entering a cylinder, is just nonsense.

So as with most posts here, rather than asking a strange vague question, how about giving some proper details, history and what actually happened that one might suspect their strange train of thought.

[Inline__engine]

forget about ported heads,all the cool kids are doing headless valves....

[Boosted LS1]

Or better still, valveless heads.

[Mignon]

Of course it'll still turn over. It'll also run fine on the other three cylinders. I ran my old Pinto engine on three for months after a crappy Piper Cams valve spring broke and dropped an inlet valve. The piston banged the broken off head back up into the valve throat and it stayed there quite happily until the next valve spring broke and left me on two cylinders in the middle of London. That was a fun trip back home - not. Still the old girl made it albeit a bit slowly.

[Richard-D]

stevieturbo said:

Boosted LS1 said:

It would probably jam itself into the piston crown and make the engine very difficult to turn over.

Or very fast to turnover once everything is fked and there's zero compression lol.


But any notion that fuel would permanently be entering a cylinder, is just nonsense.

So as with most posts here, rather than asking a strange vague question, how about giving some proper details, history and what actually happened that one might suspect their strange train of thought.

Yes, how dare the OP ask a perfectly polite technical question in the technical forum without fully understanding how an engine works. This forum would be far better if it only had 4 posters (who were all engine designers) asking each other questions about things they already knew. That way they could phrase their questions in a way the other 3 would be happy with.

Instead of this we have a handful of smartarses who are very proficient in google trying to belittle anyone who admits they don't already know everything.

[stevieturbo]

Richard-D said:

Yes, how dare the OP ask a perfectly polite technical question in the technical forum without fully understanding how an engine works. This forum would be far better if it only had 4 posters (who were all engine designers) asking each other questions about things they already knew. That way they could phrase their questions in a way the other 3 would be happy with.

Instead of this we have a handful of smartarses who are very proficient in google trying to belittle anyone who admits they don't already know everything.

Duh...my car won't go, what's wrong with it ?

Such questions get nobody anywhere whether you feel they were polite or not.

GIGO, it's a term used worldwide across many arenas. If you're proficient with google yourself, you can find out what that means.

[Boosted LS1]

Richard-D said:

stevieturbo said:

Boosted LS1 said:

It would probably jam itself into the piston crown and make the engine very difficult to turn over.

Or very fast to turnover once everything is fked and there's zero compression lol.


But any notion that fuel would permanently be entering a cylinder, is just nonsense.

So as with most posts here, rather than asking a strange vague question, how about giving some proper details, history and what actually happened that one might suspect their strange train of thought.

Yes, how dare the OP ask a perfectly polite technical question in the technical forum without fully understanding how an engine works. This forum would be far better if it only had 4 posters (who were all engine designers) asking each other questions about things they already knew. That way they could phrase their questions in a way the other 3 would be happy with.

Instead of this we have a handful of smartarses who are very proficient in google trying to belittle anyone who admits they don't already know everything.

Who are you? Come back when you've made some helpful contributions.

[Richard-D]

Boosted LS1 said:

Richard-D said:

stevieturbo said:

Boosted LS1 said:

It would probably jam itself into the piston crown and make the engine very difficult to turn over.

Or very fast to turnover once everything is fked and there's zero compression lol.


But any notion that fuel would permanently be entering a cylinder, is just nonsense.

So as with most posts here, rather than asking a strange vague question, how about giving some proper details, history and what actually happened that one might suspect their strange train of thought.

Yes, how dare the OP ask a perfectly polite technical question in the technical forum without fully understanding how an engine works. This forum would be far better if it only had 4 posters (who were all engine designers) asking each other questions about things they already knew. That way they could phrase their questions in a way the other 3 would be happy with.

Instead of this we have a handful of smartarses who are very proficient in google trying to belittle anyone who admits they don't already know everything.

Who are you? Come back when you've made some helpful contributions.

Richard

Don't come back at all.

[GreenV8S]

Richard-D said:

Instead of this we have a handful of smartarses who are very proficient in google trying to belittle anyone who admits they don't already know everything.

Instead of this we have a handful of extremely knowledgeable and experienced engineers who spend a lot of time and energy trying to help people with technical problems. Understandably they have limited patience with people who ask questions based on silly assumptions.

This thread reminded me of an old story which is true as far as I know, but came to me third hand. Somebody with limited mechanical knowledge replaced a small clapped out diesel engine with a much bigger diesel engine (also old but still working) and found the extra torque kept breaking the transmission. To get round the problem this person replaced two exhaust headers with a blank plate so that the exhaust ports were completely blanked off for two of the four cylinders. To everybody's surprise, the engine ran smoothly and cleanly on all cylinders and just produced about half the original torque. Any ideas how that worked?

[Boosted LS1]

Richard-D said:

Boosted LS1 said:

Richard-D said:

stevieturbo said:

Boosted LS1 said:

It would probably jam itself into the piston crown and make the engine very difficult to turn over.

Or very fast to turnover once everything is fked and there's zero compression lol.


But any notion that fuel would permanently be entering a cylinder, is just nonsense.

So as with most posts here, rather than asking a strange vague question, how about giving some proper details, history and what actually happened that one might suspect their strange train of thought.

Yes, how dare the OP ask a perfectly polite technical question in the technical forum without fully understanding how an engine works. This forum would be far better if it only had 4 posters (who were all engine designers) asking each other questions about things they already knew. That way they could phrase their questions in a way the other 3 would be happy with.

Instead of this we have a handful of smartarses who are very proficient in google trying to belittle anyone who admits they don't already know everything.

Who are you? Come back when you've made some helpful contributions.

Richard

Don't come back at all.

Ta ta then. I suggest you read more of the postings by people in this forum before commenting like a retarded fkwit. Later, you may have something useful to say. Until then I'll just consider you to be a cock socket :-)

[Richard-D]

Boosted LS1 said:

Richard-D said:

Boosted LS1 said:

Richard-D said:

stevieturbo said:

Boosted LS1 said:

It would probably jam itself into the piston crown and make the engine very difficult to turn over.

Or very fast to turnover once everything is fked and there's zero compression lol.


But any notion that fuel would permanently be entering a cylinder, is just nonsense.

So as with most posts here, rather than asking a strange vague question, how about giving some proper details, history and what actually happened that one might suspect their strange train of thought.

Yes, how dare the OP ask a perfectly polite technical question in the technical forum without fully understanding how an engine works. This forum would be far better if it only had 4 posters (who were all engine designers) asking each other questions about things they already knew. That way they could phrase their questions in a way the other 3 would be happy with.

Instead of this we have a handful of smartarses who are very proficient in google trying to belittle anyone who admits they don't already know everything.

Who are you? Come back when you've made some helpful contributions.

Richard

Don't come back at all.

Ta ta then. I suggest you read more of the postings by people in this forum before commenting like a retarded fkwit. Later, you may have something useful to say. Until then I'll just consider you to be a cock socket :-)

Be honest sunshine, you googled that insult too didn't you.

[Boosted LS1]

5 posts now, you're going to be a star one day, lol!

[Sardonicus]

Mignon said:

Of course it'll still turn over. It'll also run fine on the other three cylinders. I ran my old Pinto engine on three for months after a crappy Piper Cams valve spring broke and dropped an inlet valve. The piston banged the broken off head back up into the valve throat and it stayed there quite happily until the next valve spring broke and left me on two cylinders in the middle of London. That was a fun trip back home - not. Still the old girl made it albeit a bit slowly.

Strangly enough I had a Piper valve spring break on a Ford X flow in the 80's that was part of the 285 cam kit I fitted fortunately no valve damage (Heron design with deep valve reliefs in pistons) and the collets stayed in place fortunately , I went with Kent kit after this and never looked back lady luck was with me that day the build was not very old Piper suspected coil bind they presumed wrong however and didnt agree with my poor quality opinion of their product

Edited by Sardonicus on Sunday 6th January 23:29

[edd344]

It was a completely hypothetical question, I didn't once mention that this had happened to me? I just got wondering what might happen and although google might give a vague answer, usually the guys on this forum have a story or two to back up the theory.

[Sardonicus]

Put into perspective it can wreck the cylinder head damage the bore/block and in extreme cases cause rod and piston to exit the block , it is an "how long is a piece of string" question however So next to no damage to complete carnage in short ...............................................................................