Here’s the latest reader question, along with my reply!
Bobby asks: I’ve been looking at new cars, casually – and have noticed that probably half of them come with a CVT automatic. I’ve read and heard that these transmissions have problems, or are more prone to problems, than regular automatics. What are your thoughts?
My reply: Continuously variable (CVT) automatics have, indeed, become very popular – chiefly because they enable a given car to achieve slightly higher gas mileage vs. the same car with a conventional automatic. This 2-3 MPG difference (on average) isn’t much and probably not something most buyers would care about, either way – but it matters very much to the car companies, who have to comply with constantly upticking federal fuel economy fatwas.
CVTs are more efficient because they have, effectively, infinite gearing – as opposed to the fixed 5-6 (or 8-9-10) ratios in a typical automatic. They are able to get the engine RPM at exactly the right spot (or closer to the right spot) in its powerband for a given load/road speed.
The downside is that under full-throttle acceleration, they will let the engine rev to its power peak, which is usually high RPM – and hold the engine at that RPM until the driver lets off the pressure on the accelerator pedal. A conventional geared automatic will reduce engine RPM as the transmission shifts up through its gears. So, the CVT will often increase drivetrain noise and give the impression that the engine is working harder.
The other issue is that the bands which transmit the power (in between a pair of pulleys; this is how the ratio is continuously and infinitely varied) tend to be a weak spot and when they go, the transmission is often gone with it.
Regular (geared) automatics seem to be able to handle more power – and are more long-term durable.
Which is why I personally would avoid a CVT, if I were car shopping.
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