Finding a solution to breaking gearcases on high power Rs

par helical gearset, australian chap, 3000 rpm launch, wasn't running loads of power at the time. Adam (jap-jet) gave me the heads up 8)

the guys done 2 :shock:

second one looked like this :

zia said:

look's like an os giken bearing? who is it? that the layshaft is it? did he launch it? quaffie is semi helical not full helical.

Click to expand...

is it just me or do other people think that zia's turning into yoda :shock: :lol: :lol:

deisel weasel said:

Fast Guy said:

I thought helical gears were part of the problem and that sraight cut would be better?

Click to expand...

well its made my mind up about going to a straight cut box tbh, i dont want to be sat here sometime in the future with a pile of bits wishing i'd swapped to a straight cut gearset.

dont get me wrong, the quaiffe is obviously a good option for a decent power, occasional drag, occasional track mainly road driven car, and strengthing the case will definately help but the way my car is going spec wise i think it'll end in tears

i've no real interest in having it as a road car anymore so straight cut wont be any bother, it'll still be road legal but it wont be popping to the shops

Click to expand...

You mean like a standard gearbox is?

The casings are weak however the fact that the majority of people tend to use boxes that aint been opened for 14 years or so and have high mileage on them dosent help matters. When the bearings wear the clearance on them is increased which can lead to play/vibration in the shafts hence giving the shafts room to bend on load and the helical gears to thrust the shafts axially leading to cracked casings and stripped gears.

When i bought my car it had a rattling gearbox, i took it out and had it reconditioned, it lasted me a years worth of abuse with no problems whatsoever, i sold it to Luwi earlier this year and he used it for a short period and ran an 11.1 1/4 iirc in the Jap finale at pod, the box still did not break, i believe it is now fitted to Jason Gants car as a stop gap to fill in between a custom gearbox being made and his previously trashed item.

It could be worth having the bearings and syncs replaced by a competent gearbox builder whilst doing your power mods to at least give the gearbox half a chance of surviving :?

just get a straight cut syncro ppg box with uprated selecta forks and bearings sorted! hopefully

deisel weasel Posted: 30 Dec 2005 19:15 Post subject:

--------------------------------------------------------------------------------

zia wrote:
look's like an os giken bearing? who is it? that the layshaft is it? did he launch it? quaffie is semi helical not full helical.



is it just me or do other people think that zia's turning into yoda

Click to expand...

"much to learn you have, teach you the force i will hmmm" :lol:
zia

jeff, i cant really see what that little pearl of wisdom is in aid of tbh ?

The quaiffe i've got is brand new, thats everything...gearset, bearings, baulk rings, synchros, par uprated 3rd-4th selector fork, a brand new box, never fitted, never used, built by one of the most respected gearbox builders down this end, if not the country

i'd rather not see it in a pile of broken bits :lol: and be getting a straight cut gearset in there anyways.

but thanks for the advise :lol:

if you want to pay for them and pop down and fit them i'll use disposable standard boxes all day long :lol:

Just read some of this thread and it worried me a little. how much power is big power? and are there many quaife gearset boxes breaking?
just wondered as have just got a quaife box with O.S.Ginken clutch and
it is a bit on/off compaired to the standard box with ap clutch. Always thought the quaife was the way to go to be reliable but this puts a spanner in the works, Should i have stayed happy with my reliable, relatively standard car?

sunny scott said:

Should i have stayed happy with my reliable, relatively standard car?

Click to expand...

i think we all should've done just that tbh :lol:

if mine was going to be road driven i'd stick with the quaiffe, most are more than happy with them, i wouldn't worry, just treat it with some respect and it should be fine 8)

Just read through the rest of the thread and think i might be ok as don't launch the car in 1st and have a single plate os ginken but the gearchange will take a bit of getting used to.

Rishi

Have you had any joy with Ian on this subject? Will hopefully be up to see him in the next few months to start upgrading my engine for the coming season, so very interested in any gearbox modifications that would keep the car reliable on the track.

Cheers and a happy new year.

Phil 8)

bracpan said:

Have you had any joy with Ian on this subject? Will hopefully be up to see him in the next few months to start upgrading my engine for the coming season,

Click to expand...

Don't you mean the following season :?: lol :lol: :lol: :lol: :lol: , Hes not the fastest engine builder in the west :lol: :lol: .



rob

No i ment this season , only having an ecu and boost upgrade for this year.

Will get any rebuidling done over the next winter.

Cheers

Phil 8)

i might need those braces

Ouch, that has definitely shit itself!!

yeah the end cone bearings shot across the startline it was also stuck in gear with tiers glued to the surface we had to drag it of the track the noise was horrific.

Standard gearset too :shock: Usually the teeth fall off them before the casing goes :lol: