Read this on a website called 2 carpros. >An engine that is running unusually smoothly and quietly is a sign of low compression caused by worn piston rings <
Originally Posted By: littleant
Read this on a website called 2 carpros. >An engine that is running unusually smoothly and quietly is a sign of low compression caused by worn piston rings <
I guess I better overhaul my engine
No, because it's absurdly anecdotal, a blanket generalization with absolutely no proof, on a website where anyone can post questions and anyone can post answers. Rubbing two brain cells together to even ponder it is a waste of time and effort.
Originally Posted By: littleant
Read this on a website called 2 carpros. >An engine that is running unusually smoothly and quietly is a sign of low compression caused by worn piston rings <
I guess I better overhaul my engine
Maybe if ALL the rings were worn down exactly alike? Most engines I've had with bad rings exhibited massive oil burning on deceleration long before any other symptoms (like loss of power) happened...
Originally Posted By: littleant
Read this on a website called 2 carpros. >An engine that is running unusually smoothly and quietly is a sign of low compression caused by worn piston rings <
I guess I better overhaul my engine
The key word here is unusually.
This statement isn't about smooth and quiet engines. It's about engines that become quietER and smoothER than they normally are.
No idea how true this is, but it's certainly less ridiculous than the interpretation that low NVH comes from bad compression.
Yes, I suppose it's possible. Testing would be difficult, and anecdotal evidence might even be hard to come by, given that this is obviously a very slow process, and noticing it would be hard.
I used to work somewhere with a Cushman Turf Truckster that had a Kawasaki liquid-cooled two cylinder with over 25,000 hours on it. Crazy hours.
In its last couple of years it got quieter and slower. It was almost kind of weird. Eventually it didn't have enough power to move and was finally replaced. It was a very slow death.
I would think anything that reduces power output will make an engine smoother/quieter.
Low compression, restricted exhaust, clogged air filter, throttle or valves not opening fully.