Engine Tech Discussion at Hooters Last Night
Thread Starter
Drifting
Joined: Nov 2002
Posts: 1,665
Likes: 1
From: Ontario
Engine Tech Discussion at Hooters Last Night
This is an exaggerated view of an engine cylinder wall after many miles.
Lets say this engine was babied all its life and was never revved above 3000RPM. Then one day the engine is revved up to 5000RPM. What result is more likely between these two possibilities:
1) As RPM increases the rod stretches and the piston ring probably shatters as it collides with the lip/ridge.
2) The piston ring does not shatter because there will probably be enough up and down wear for the rings to move in the piston ring grooves in the piston.
Your thoughts?
Lets say this engine was babied all its life and was never revved above 3000RPM. Then one day the engine is revved up to 5000RPM. What result is more likely between these two possibilities:
1) As RPM increases the rod stretches and the piston ring probably shatters as it collides with the lip/ridge.
2) The piston ring does not shatter because there will probably be enough up and down wear for the rings to move in the piston ring grooves in the piston.
Your thoughts?
Le Mans Master
Joined: Mar 2004
Posts: 7,502
Likes: 1,510
From: Little Rock AR
So, let me get this straight....You are in Hooters, and you are debating the effects of cylinder wear on piston rings at high RPM.... 
I do not know the answer to that but I would like to hear more about the BEER.
Vettes 
and the "quality" of the service. 
-Mark.
I do not know the answer to that but I would like to hear more about the BEER.
Vettes and the "quality" of the service. -Mark.
Le Mans Master
Joined: Apr 1999
Posts: 6,134
Likes: 46
From: Raleigh North Carolina
"Performance builders recommend allowing from .002-.003 for rod stretch at high speeds. "
http://www.hastingsmfg.com/Service%2...ueprinting.htm
http://www.hastingsmfg.com/Service%2...ueprinting.htm
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Melting Slicks
Joined: Apr 2004
Posts: 2,008
Likes: 38
From: Space Coast Gator Territory
If you move from the theoretical and into the pactical, the engine will continue to run as those tolerances will not factor. Many years ago an old buddy had a 58 Buick Roadmaster that he was having problems with. Since he was going to junk it, he wanted to blow the engine. He put a cinder block on the acclerator at full throttle and we went inside for a cup of coffee. 30 minutes later it was still reving, but running hot. Eventually, it seized from overheating. If it could have been kept cool, with a steady supply of fuel, it might still be running. I think I read somewhere that GM engines need to be designed so that they will stand up to something like 30 hours of continuous full throttle action. I have beat on many well worn stock engines with no ill affect. I don't know how you could stay focused on this topic at Hooters without rod stretch coming into play. 
Thread Starter
Drifting
Joined: Nov 2002
Posts: 1,665
Likes: 1
From: Ontario
Originally Posted by proracr
That explains it! When I go into Hooters, I have a meal and leave. I've never spent "hours" in there before. 
Thread Starter
Drifting
Joined: Nov 2002
Posts: 1,665
Likes: 1
From: Ontario
Originally Posted by stingr69
I do not know the answer to that but I would like to hear more about the BEER. Vettes and the "quality" of the service.
Vettes and the "quality" of the service. 
Drifting
Joined: Oct 2004
Posts: 1,496
Likes: 1
From: Lafayette Louisiana
Originally Posted by stingr69
So, let me get this straight....You are in Hooters, and you are debating the effects of cylinder wear on piston rings at high RPM....
I do not know the answer to that but I would like to hear more about the BEER. Vettes and the "quality" of the service.
-Mark.
I do not know the answer to that but I would like to hear more about the BEER.
Vettes and the "quality" of the service. -Mark.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
Originally Posted by Boofers
This is an exaggerated view of an engine cylinder wall after many miles.
Lets say this engine was babied all its life and was never revved above 3000RPM. Then one day the engine is revved up to 5000RPM. What result is more likely between these two possibilities:
1) As RPM increases the rod stretches and the piston ring probably shatters as it collides with the lip/ridge.
2) The piston ring does not shatter because there will probably be enough up and down wear for the rings to move in the piston ring grooves in the piston.
Your thoughts?
Lets say this engine was babied all its life and was never revved above 3000RPM. Then one day the engine is revved up to 5000RPM. What result is more likely between these two possibilities:
1) As RPM increases the rod stretches and the piston ring probably shatters as it collides with the lip/ridge.
2) The piston ring does not shatter because there will probably be enough up and down wear for the rings to move in the piston ring grooves in the piston.
Your thoughts?
Le Mans Master
Joined: Apr 1999
Posts: 6,134
Likes: 46
From: Raleigh North Carolina
Originally Posted by jackson
Nothing will happen. (1) The cylinder taper will not be enough to have any effect on rod stretch at 5K. (2) There's plenty of room for the rings to move in-out ring grooves ... it's quite unlikely there'd be so much wear the rings would pop out of the grooves.
The rod stretch (also bearing failure) allows the top ring to contact the ridge at the top of the cylinder under high rpm, where grandma never ran the engine.
The day-to-day use created the ridge... at low rpm.
When the ring hits the ridge, the ring snaps in two, and tears up the cylinder walls.
I've pulled a lot of re-ringed engines apart that had broken rings in them. Bubba re-ringed 'em without removing the ridge, and then thought he had a "race engine".
So much for "practical" experience.
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Engine Tech Discussion at Hooters Last Night
