Do stop/start systems wear out the starter motor? Discussion with an engineer.
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Flickr image: Doug McCaughan Green Car Reports has an interesting article today about engine stop/start systems. It addresses one of the most common objections many gearheads have against the fuel saving technology: that it must wear out the starter motor. The piece is an interview with an engineer at an OEM parts supplier, who explains how the starters in stop/start cars are designed differently than conventional starters. Major differences:
Don't start-stop systems wear out your car's starter? Now if only they would interview an engineer to explain why stop/start systems don't cause additional engine wear from oil drain-down. |
My takeaway is that vehicles that have dedicated start/stop systems also have starters engineered to do start/stop. Traditional cars without start/stop will likely see increased starter wear if start/stop is implemented.
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Makes sense. Ask me in 20 years how my now 20 year-old conventional starter has held up, being used much of its life like a "stop/start" starter.
Side note: a new-looking Mercedes sedan startled me slightly the other day as I was biking past and its starter motor engaged as it pulled out from a side street stop sign. |
Yes, there are also the questions of exactly how extra wear would one expect from a traditional starter in a start-stop role, and if it would be possible to retrofit some of the newer features on the traditional starter (like the needle bearings or better brush material).
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He basically admits it does wear the starter and why wouldn't it? The question is do ALL the systems use a better built starter? Does that also mean it lasts just as long but costs 2 or 3 times more? Do they also think to make it easy to change?
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Not all start-stop systems even use the starter motor.
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The article you quotes states that the off time is generally 45-90 seconds. |
Yeah, I was playing devil's advocate with the oil drain down question because it's another objection that comes up a lot in comments about stop/start systems, especially from traditional "enthusiast" sites.
You only have to look at fleet use of hybrids (eg. high miles taxis in urban service) for evidence that it's not a problem. |
IIRC Renault claim 200,000+ cycles from their stop starter (that would be once a mile for 200K miles;)). Stop starter on my 2 cylinder is about the size you'd find on a V8. I'd be very surprised if anyone ever wore one out.
For non S/S cars, you can investigate using the (larger) starter from a diesel model, just swap over the pinion/ clutch mech. I did this on an older Mercedes. |
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