Oh god...This thread is officially Hijacked...
First off, please use some proper english...thrying to raed carp that is'nt speled rite is a apin in teh arse!!
Second...from your article...
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But many trucks and some racing cars are still set up with a non-synchromesh gearbox. With trucks, because they have so many gears, it's noticeably more efficient not to have all of the gears in mesh all of the time. So with the "crash-box," you HAVE TO double-clutch, or you will not be able to shift. The same holds true for racing cars—to gain the last couple percent of efficiency, only one set of gears is in mesh at any time, and you have to actually synchronize their speeds or you can't get it in gear. Despite the obvious drawbacks of having to double-clutch, the gearbox is stronger and more efficient than a comparable synchromesh one, and has less tendency to overheat.
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Last time I checked...our cars aren't race cars, nor trucks, nor do they have Crash Boxes in them....
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Other reasons for double-clutching: Because it is the right way to operate the clutch.
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If you've got a crash box, truck or race car as seen above, sure is!!
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Because it saves wear and tear on your synchronizers in the long run, if you're planning to run your car over 200,000 miles
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Guess what, even if you don't double clutch, just change your fluid once in a while and no problems. I've got a '89 MX6 GT that has over 240k on the original tranny, and guess what...It's the smoothest shifing car I own, always has been...Why? It's not abused, and gets maintained...and guess what else...NOBODY has EVERY bothered to double clutch it...
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Because it is fun to do.
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Yes, it is sometimes
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Because in very cold weather, (-10° F, for example) you may have to double-clutch to shift gears at all, at least for the first few miles.
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You live in -10° F weather? If you do, then you better have the proper fluid in your transmission, and still be easy on it the first few mins...and still no double clutching needed...
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One very important reason is that, if your clutch linkage ever fails, you can still shift and get home by double-clutching, getting the engine and gears' speeds synchronized and then just EASING the shifter into the right gear.
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Yeah, I kinda mentioned this already...it can also be done without a clutch at all...
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Another reason is that on some old cars, first gear isn't synchromesh, so if you need to shift into first without coming to a full stop, you have to double-clutch. Also, a lot of cars these days are made with weak, chintzy synchros, so they soon wear out, and to drive them gracefully, you need to double-clutch.
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In a hurry to get into 1st gear? If so then yes, you have to double clutch...if you don't have synchro's...but guess what...YOU DO!!! Granted double clutching will slip it in nicely, but again, on a race course your best and fastest bet is to simply rev-match...by the time you take the extra .3 second to pump the clutch you're already needing to be in gear and ready to accelerate...sounds nice, but doesn't always work so well...As for 'chintzy' newer car synchro's...See above about my 240k plus mileage MX6
And then to top it off, you're referencing a guy writing for an ELECTRONICS website?!?!
Dear god...at least bring someone with some automotive credentials to the table, granted he seems to fairly well know what he's talking about...but really now...How about I start spewing off about TV Tubes...Sure, I know how they work, taken them apart, blown them up, even sold televisions in a high end home theatre store, but do I claim to be an expert on their operation? No, I don't.
In summation...double clutching is NOT necessary, it WON'T hurt anything, it's just not necessary...and in MY experience, I've put well over 200k miles on variuos Mazda trannies, both first and second generation, and even a Ford Exploder with a Mazda transmission...I've broken them stuck them in gear, blown the cases apart, but even through all the racing, all the beating and grinding of gears has there been a synchro failure...No. Not one yet. And I rarely double clutch...
And furthermore, tell me this...do you Auto-X, Road Race, or do some other form of racing?
Laters
Ryan
