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| droid2 | I am wondering if anybody understands how the chevy mazda when at a traffic light shuts engine off and then turns it on when going. Is it shutting the engine completely off and turning it on i would think so its like the ecm computer pushes the start button for you | 16:28 |
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| droid2 | Else what keeps the pistons rotating on the crank if no fuel is being used | 16:29 |
| rjek | droid2: It saves fuel and reduces pollution | 16:29 |
| rjek | Normally it's done with a flywheel or it just reuses the starter motor | 16:29 |
| droid2 | If i am correct this would be equivalent to manually shutting off and starting the engine at ever stop sign like with any car | 16:29 |
| rjek | You can normally turn it off if you find it annoying, but I have no experience of Chevy or Mazda. | 16:30 |
| droid2 | Wait how are you thinking it is done with the flywheel or starter motor wouldn't that be the same as just starting the car from a dead stop | 16:30 |
| rjek | Not quite; the engine will be warm and already primed | 16:31 |
| droid2 | Seems as it would be more prone to burning out the starter motor over time maybe not | 16:31 |
| rjek | So it's not as wasteful by a long stretch as a cold start | 16:31 |
| droid2 | O wait so the chevy mazda you can turn off the shut down of the engine if you don't like that feature? | 16:32 |
| rjek | I have no idea about that specific manufacturer or model. | 16:32 |
| rjek | I know in most German brands you can turn it off if it erks you | 16:32 |
| droid2 | Because other then that i kind of like the car only thing is it uses a smaller 1.6 liter engine which is kind of shitty but uses a turbo on the exhaust to give the illusion of larger engine | 16:33 |
| droid2 | Does look really sporty though the look is great | 16:33 |
| droid2 | rjek is this shut off engine feature completely shutting the engine off ? | 16:35 |
| rjek | On the other hand, I imagine it's very efficient. | 16:35 |
| rjek | droid2: I have never looked under the bonnet of one. It's probably just stopping it but keeping it warm; normally it's only for a few seconds so it'll still be hot | 16:36 |
| droid2 | Or is it using the starter motor continously to spin the engine before a reinjection of fuel and sparks are fired | 16:36 |
| rjek | Almost certainly not | 16:36 |
| rjek | That'd quickly flatten the battery | 16:37 |
| droid2 | Well i looked under the hood briefly and it seems to be not to complex so i think the computer just has extra wires to the starter motor or tr sensor of the transmission | 16:37 |
| droid2 | seems like there is not really any new components for the starting and charging systems | 16:38 |
| droid2 | directly | 16:38 |
| droid2 | Ya doing that with the starter motor would tax the battery life and alternater alot. So then it most completely shut the engine off | 16:39 |
| droid2 | i.e no spark , no fuel injection fired , no crank shaft rotation | 16:39 |
| droid2 | rjek i as for the effiency i would think the turbo gives the efficency more so then the stop and go feature | 16:41 |
| droid2 | Unless of course your at stand stills alot or very city driving | 16:41 |
| droid2 | shut off feature not going to save you when it comes to highway , non city / non heavy stop light roads | 16:43 |
| droid2 | plus reuses of the starter motor seems like these cars would have to have more longer lasting starter motors or going to be prone to starter motor fixes ever so many thousands of miles | 17:23 |
| droid2 | just my guess | 17:23 |
| droid2 | not to say engine repairs and under hood fixes seem not as complex in these cars | 17:24 |
| droid2 | so maybe not to big an issue in maintance repairs | 17:24 |
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