But our advice has to be to to always leave Stop-Start engaged if your car is equipped with it. Go to front page. What is Stop-Start Technology? How does Stop-Start work? What are the benefits of Stop-Start? What are the downsides of Stop-Start? Buying a car. Recommended for you. Head gasket guide: what it does and blown gasket repair. Car ramps guide: how to use vehicle lifts safely. Car lights and bulbs: the complete guide. Tyre pressure checks: the complete guide. Is your speedometer as accurate as you think?
SISS would have manipulated the alternator load to stop all four pistons exactly halfway through their stroke. To restart, the cylinder in its compression stroke would get a small squirt of fuel that, when burned, would spin the internals backward just enough to produce compression in the neighboring cylinder.
Unfortunately, this elegant idea never materialized, and Mazda went the more traditional route with its i-stop , available on 2. The i-stop system, though, does use an initial combustion blast to aid firing, easing starter stress and reducing the restart time by half, to a claimed 0. Therefore, U. The Japanese city-cycle test has 40 seconds of idling, so the cost of i-stop is justified there. The system also requires a tougher starter motor, which will be operating a lot more than usual, and a more high-tech battery, designed to run down and recharge.
Some cars even have a second battery for this purpose. And the engine itself needs harder and have smoother workings to reduce friction when starting and increase durability. As the video shows, not all Auto Stop-Start systems are created equally so make sure you assess its operation as part of your test drive. The best Auto-Stop start system is the one you barely notice, so you want a fast restart, with the engine back up and ready to go in the time it takes you to move your foot from the brake pedal to the accelerator.
Ferrari Competizione review. Cupra Formentor VZ2 1. View all latest drives. Read our review Car review. Volvo XC Read our review. Read more: How to buy a used car - expert top tips Such a moment may come when the driver has decided to stop, but for whatever reason has a change of mind, such as when the traffic moves off unexpectedly.
Disadvantages of stop-start technology: Does stop-start wear out my engine? Read more: How to look after your turbocharged car Two things prevent that happening.
Low friction oils help prolong engine life The second is improvements in lubricating oils. Read more: What oil should I put in my car? Does stop-start help save fuel?
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