Date: Mon, 28 Jan 2002 14:31:44 -0700 From: Nate Williams <nate@yogotech.com> To: Chad David <davidc@acns.ab.ca> Cc: Nate Williams <nate@yogotech.com>, "M. Warner Losh" <imp@village.org>, chat@FreeBSD.ORG Subject: Re: Transmissions :) Was: Firewall config non-intuitiveness Message-ID: <15445.49984.234327.717296@caddis.yogotech.com> In-Reply-To: <20020128142439.I66369@colnta.acns.ab.ca> References: <1617.216.153.202.59.1012240332.squirrel@www1.27in.tv> <20020128192930.GA86720@student.uu.se> <15445.44102.288461.155113@caddis.yogotech.com> <20020128.131414.49257581.imp@village.org> <15445.45720.514136.887062@caddis.yogotech.com> <20020128135603.G66369@colnta.acns.ab.ca> <15445.48220.670641.705228@caddis.yogotech.com> <20020128142439.I66369@colnta.acns.ab.ca>
next in thread | previous in thread | raw e-mail | index | archive | help
> > > > > : If I enable the clutch in my car, my car moves (assuming it's in gear). > > > > > : If I disable it, the power is no longer going to the drive wheels. > > > > > > > > > > That's not quite right, but it is a good analogy. If you disable your > > > > > clutch, then you are going to have to shift without it and deal with > > > > > putting it into gear at stops. > > > > > > > > Unfortunately, you can't do it w/out a clutch. (At least, not without > > > > tearing your clutch/transmission to bits). > > > > > > No true :). While at a stop a clutch is a good idea, you can avoid > > > ware on a number of parts if you learn to shift without clutch while > > > moving. > > > > Actually, the wear you save on the clutch (which is designed for this) > > will be translated to the gears in the transmission. Very few (!!) > > people are capable of shifting w/out a clutch and *NOT* doing damage to > > the gears. > > I actually know a lot of people who are capable, but growing up in a > family of farmers and mechanics, and spending most of my recreational > time at the race track I may not be "normal". I *personally* wouldn't have any qualms about doing it on farm machinery or a motorcycle, but I'm leery of doing it on the new tranmissions used in the high-performance sedans and sports cars. I blew up on too many clutches/transmissions on an older model car in high-school. :) > > > On smaller four and five speed transmissions (or bikes)this is > > > actually quite easy... on 3 ton grain trucks and tractors its a little > > > more tricky. > > > > Actually, on grain trucks it's *easier*. (Speaking with 15 years of > > experience driving them. :) :) :) > > > > On the smaller cars, the synchro-mesh setup on the gears makes it *much* > > harder to do it cleanly, while on big grain trucks and bikes, it's > > easier since they don't add such things since they are mostly > > un-necessary. (And, not using a clutch is more common.) > > Now you bring synchro-mesh into the picture :). I didn't mean that > you couldn't do it in a truck, its just that you have to be careful. None of our grain trucks had synchro-mesh on them, hence the reason it was easy. Synchro-mesh is rarely used in big vehicles, because: 1) If it's that big, it's *supposed* to be hard to shift. 2) Synchro-mesh introduces another point of failure. When you've got that much weight the tranmissions is controlling, light-guage aluminum rings are *NOT* a good idea. 3) Due to large 'shifting' ranges on the big rigs and/or large number of gears, the need for synchro-mesh is lessened. On 5/6 speeds, you need because the RPM differentail required to shift between gears is much greater, so synchro-mesh helps you to 'get it into gear' when the RPM's don't match up as well (even with a clutch). However, that's probably alot more information than most people care to hear. Glad this is on -chat. :) :) Nate To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?15445.49984.234327.717296>