Why a WRX, who often comes on our Monday night cruise, (See LINKY if you are wondering what cruise i am talkign about.) Sounds like he is driving in reverse all time, i asked someone but their answer went completely over my head, something to do with no clutch or something?! p.s. There will be points allocated to the person with the best descriptive answer. Please note that the marking criteria will be on: - Punctuation (for you Llyod). - Clear presentation of information (you will be marked down on excess block paragraphs and sentences thus loosing the non car literate reader). - Thorough answer, best explaination of question in its entirety. p.p.s I am actually asking this as a genuin question because i think it will finally fill in the missing gap of my knowlegde on the relationship between the engine, gearbox and clutch... possibly more! Who knows!
some of the answer is that he has a aftermarke gearbox and it just sound like that. my mates wrx sounds like it too
ok hear we go ill try my best ps. sorry for the grammer and spelling to understand what a straight cut gear is u have to under stand what normal car gears look like normal car gear are helical gears the reason why they use helical gear is because when the gear is spinning there is alway a porshan of the gear tuching the other gear. this gives removes slop and or so noise the down side of this is they arn't as strong as square cut gears because less of the gear faces are tuching and they hard to make out of strong metals. they look like this straight cut gears or so know as square cut gear are racing gear they are used because they are very strong. the reason why is because they are easy to make out of harder metals and when under load the gear tuch the full with of the gear unlike the helical gear were only maybe 1/3 tuch at anyone time (along the with of the gear) the only real down side of these gears is they make a hell of a noise and there can be quite a bit of slop when not under load i hope that help if not please ask and ill try again
I couldnt be stuffed reading your post but i think you may be refering to the fact it has a dog box in it
No dog box is something different a dog box has dog engagement witch dose away with synchros and a need to used the clutch it is a really primitive way of doing it but effective. this wouldn’t be the reason why it makes the extra noise if it sounded like the gearbox was really whiny its probably square cut gear if you have ever watched the WRC (world rally championship) on TV and they show an in car bit the whining sound that you can hear is from the gearbox and its because they run square cut gears
It may have a dog box im not disputing that but it doesn?t need a dog box to have straight cut gear nor do you need straight cut gear to have a dog box (ur an idiot if you don?t tho) the only way to tell if it has dog engagement with out looking at the box is to see him change gear as he wont use the clutch or hear it when he changes gear because it often make a loud crunch/bang as the driving dog hits the dog tooth/teeth
Buzz almost a perfect score!! Cheers mate, that makes complete sense now! And i presume this is in the actual gearbox itself? Or just out of it? And then how does the clutch actually work? P.s. I'm going to be asking many many "dumb" questions over the next few months, till i get clear enough answers to create my.... CARS FOR DUMMIES - tech article covering all mechanical aspects, explaining the basics and then going into mods etc.
if you want to know how a clutch works read this http://auto.howstuffworks.com/clutch.htm remeber for a normal gearbox you need a clutch and for a dogbox you dont need out but people still you them just not as much This will give you a good idea on how gearboxes work so have a read if you need any more information please ask http://auto.howstuffworks.com/transmission.htm its cool it even has kick ass flash clips showing how it works
That's pretty good... Another reason that helicals are quieter is when they mesh they push the air out to the side rather than 'squishing' it. Don't laugh it's true. Helical gears are actually stronger than spur, but they create horrible axial forces which flog out your bearings a lot quicker. Technically you could run needle rollers in a spur gear box while in a helical box you would need deep groove ball or taper roller bearings. The reason they use spur gears rather than helicals is purely cost related, although you use the same cutting hob for both it comes down to the final grinding and lapping. The same strength is easily attainable as all heat treatments are applied after manufacture. This heat treatment is what gives the gear it's strength. So making a helical gear: Cutting from blank (cheap) Grinding (horribly expensive depending on production run) Lapping (nt normally required, but gives you a smaller backlash, also expensive) Annealing (cheap) Case hardening (cheap) Making a spur gear: Cutting from blank (cheap) Grinding (mildly expensive depending on production run) Lapping (not normally required, but gives you a smaller backlash, also expensive) Annealing (cheap) Case hardening (cheap) So there you go, any more questions while I have the gearbox design book in front of me??
