whats the main reason for them? been told there better for track cars

and also whats the typical life span of them??


Cheers Radleigh

 

Stronger less breakages but fooking noisey but you gotta love the sound

erm life span forever unless your an absolut animal

 

cool!

Looking into getting a straight cut T5 when im back, Not arsed about the noise either

 

Evening Dude, still thinking about the S2 all those miles away then!

 

damn right...



im having bits made up here too

 

Care to enlighten me, or is it another top secret MSN job!?

 

here we go again with the secret squirel again

 

Always the way aint it! A little beer mat shuffling here and there...

 

 

dont put any thrust loading onto the gearbox shafts/bearings

 

My 1st 2nd and 3rd gears generally last about 2 years before going in the bin....

 

what do you mean Gareth???


Cheers Tony

 

They are cut straight as opposed to angled, so when engaged, the forces work 90deg from the shafts against each other - there is no forces in the direction of the shafts. No axial forces...no thrust forces - I'm no engineer but I think those are the correct terms.

 

grab me on msn one day and ill chat too you about it,, well what i uderstand anyway

 

that wont be for 4 months then LOL

its 5 hours time difference, byt the time ive finished work, gym eaten showered.. its to late!


If you could, reckon you could drop me a pm

Cheers too!!!


Or do you know what ON-UJAH has just typed???


Cheers also

 

you really need to try a straight cut box first mate..

they are FAR too loud for the road and dont like shifting at anything aprt from full throttle..

would be a nightmare onthe road IMO

 

not true that pal, they are as refined as a normal box. now if we are talking dog engagement then thats totaly differant m8

 

maybe got mixed up

thought the reason normal gear box's were helically(sic) cut was to ease engagement?

 

I thought noise was one of the issues with straight cut gears?

 

I cant hear any passengers speaking (and visa versa) unless we have the intercom or practice headsets on.

Even shouting at times it is just totally impossible to hear what they are screaming at / for, and the passenger is what.... about 20 inches away ?

Yes they are loud

 

Main two reasons for straight cut gears:

1) Less side loadings, which means they can take higher loads without punching the shaft out the of the case etc (pulsars do that a lot on helicals for example)

2) MUCH cheaper to produce, especially in small numbers, so when you are racing and want loads of different ratios, you wouldnt be able to tool up for helicals even if you wanted to.


I only ever use straight cut cogs when helicals wont handle the power if its a roadcar.

 

So from what I see a straight cut gearbox would stop an animal like me from trashing it everyday when I slam between the gears on the redline!

Doubt it will save the 4th clutch in 2 years .......

Thats with 155bhp, fuck knows how I intend to keep a cossie clutch intact for more than 5 minutes if I convert my car to cossie power!

 

You normally break the synchros doing that not the gears, so SC wouldnt make any difference unless its a bog dox or something too.

 

Is there a mechanical solution???


If so I presume its expensive!!!

 

Warren, www.bsm.co.uk have the best solution for you by the sounds of it

 

Hey!!

I've not had any serious crashes in the last 2 years!!

Driving off the side of a mountain does not count as there was no damage!!

 

Its for my track car, so no issues there, cheers though



Cheers all for the replies

 

All the forward gears are in constant mesh - they do not slide into each other to engage gears. Its the syncro hubs that lock the various gears to the shaft to produce drive.

 

http://www.supercarchallenge.nl/video/Assen-bmwSTW.wmv

Don't think I could cope with a straight cut box if it sounded like that

 

to be honoust that is the loudest box ive ever heard, i would actually say theres something wrong with it, because all the ones ive had, and all the cars ive been in with them non make the whirring noise that that makes - its fooke d! !

 

Most rally cars run straight cut dog engagement gears, also most productions cars have a straight cut reverse. So you can imagine what it would be like if you had to drive about with that whine all day.

You can also get helical dog engagement gears, so you can slam the gears in like a rally driver, but still have the low noise of an everyday box.

There's also a company in Japan that developed a gear shifter that you just push forewards or backwards to change up or down.

http://www.ikeya-f.co.jp

 

That sounds very similar to mine The whine sometimes actually hurts your ears

Its solidly mounted to the car everywhere with not a single rubber bush in sight, the noise transmits all too easily.

 

remind me never to thumb a lift from you , i thought mine was loud pal

 

Get an intercom and headsets!!!!

 

WOW - id never thought of that

 

Saves shouting at the drive through Mark

 

Youve still got to shout at the chav serving you, or switch off your engine!

 

lol

 

Where is that picture ?

 

this one tony ??