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Originally Posted by Deltona Couple
The synchro does one thing, it brings the INPUT shaft quickly up to the equivalent speed of the OUTPUT shaft, allowing the hub to lock the gear to the output shaft.
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Does that not put some form of stress on the synchro? The laws of physics would seem to indicate that it does. . .
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Double clutching or "speed-shifting" will actually damage the synchros faster, unless you are VERY good at it.
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Well I think it goes without saying that things only work if you do them right
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Otherwise you are forcing the synchro to engage the gear under a load, which is NOT good for it.
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I'm not sure I get what you're saying here. I can't see how pressing the clutch would create a load on the transmission. It takes the load OFF the transmission - that's what the clutch is for. I'm sure I'm misunderstanding what you're saying.
If you properly double clutch you press the clutch down and shift out of gear. No load on the tranny. You then blip the throttle to match the engine revs to the speed of the gear you're about to go into, and press the clutch again while shifting into that gear. Still no load on the tranny. You let the clutch out with the engine already going the speed it's supposed to be going in that gear. How does that create more load on the transmission than, say, downshifting to 2nd from 50mph by just popping the clutch with no throttle work?
I'm not trying to discredit you here, but your advice goes against the advice of just about every automotive expert out there. The closest I could find are the Car Talk guys, who say it wears on the clutch (by which they mean the clutch spring) more but say nothing about it wearing out the synchros faster.