Hello, I'm wondering about one thing. ECVT keeps engine rpm at very low level when driving normally, below 2k rpm, let's say it's around 1500 rpm most of the time. How this affects timing chain and general health of the engine? Because if you drive a manual transmission car like that you will basically stretch a timing chain and put a lot of stress on connecting rod and pistons. Is ECVT somehow putting less stress on the engine at low rpm? And engine is safe form chain stretching and connecting rod, pistons problems? Sorry for my English, it's not my first language.
I don't understand your question. A timing chain isn't related anything to transmission, it only does job to spin camshaft from crankshaft to open and close the valves. It generally lasts forever only if it's a good design and changed oil at proper intervals. A poorly designed timing chain or tensioner can stretch or fail like some of GM and Volkswagen had this problem.
why does low RPM stretch chains?
My point is that cvt keeps engine at low rpm, rpm below 2k is bad for engine, something like driving at high gear at low speed in manual transmission car let's say 6th gear at 30mph. How to say it? Engine lugging?
Engine lugging?
Yes. Well made engine/timing chain won't be harmed.
rpm below 2k is bad for engine
why? How are connecting rods and pistons affected?
Engine lugging?
does your engine lug?
Having a very open throttle actually reduces pumping losses and greatly increases engine efficiency, which is the whole purpose behind using a CVT. The engineers have designed it very carefully. Cars like the Prius are not race cars. They're optimised for efficiency.
Do you mean eCVT like in Toyota Hybrids? Or do you mean CVT like in the traditional sense? And by timing chain, do you mean timing chain on the engine, or chain/belt on the transmission?
An eCVT from a Toyota hybrid doesn’t have a chain/belt. So you don’t have to worry about that. But it does have a timing chain. I am not too familiar with different RPM’s causing a stretch that others, but it seems as though it would stretch over time and usage.
A traditional CVT, IMHO, I thjbk yiu have to worry more about transmission belt/chain wear and tear before any stretching. It’s just the nature of the beast that it would shed a lot of material, especially JATCO CVT’s.
