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Rob H

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A bit of saturday morning food for thought.

I was reading through a old copy of mag and it featured Werner Stommel's turbo (one of my favorite modified minis) which appartently runs a titanium gearset.

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Ric

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That names rings a bell, but i can't think what the mini is like. Time to get googling!


stevieturbo

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Surely titanium would not lend itself to gear usage ?

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Tom Fenton
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I didn't think so I must admit, but Carl is the man to comment really.


On 29th Nov, 2016 madmk1 said:


On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else


Like fuel 😂😂


fastcarl

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Correct, Stevie, it would last a few miles then knarl to pieces.

i seen to remember reading this about TI gears at the time and knowing it was not true.


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RogerM

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He might have had the gears TiN coated (Titainium Nitride) but I'd not have thought that surfac wear would be the real issue or that TiN would be the right coating to choose even if it was!!!!

Every day is a school day ...........

How fast and how expensive ...... the same question...

On 27th of Sep, 2007 at 12:45pm Jimster said:

why do you you think I got a girlfriend with small hands?


Joe C

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Carlos Fandango

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I remember that article and thinking I was sure Ti wasn't suitable for gears and stuff,

Also I remember someone in europe advertizing Ti drop sets in tha back of either minimag or miniworld not lon after that article.

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

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Jason G

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Slightly O/T....are all 998, 1275 gearbox casings the same?

On 19th Jan, 2010 wil_h said:
I would start the furthest place from the finish.


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Been neglecting Turbo'd 'A' series..............


Joe C

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Carlos Fandango

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pretty much,

going backwards in time ther is the A+ case, then the A rod case, then the A remote case, i think at this point there are some different casings, but thats far enough back not to be woried about.

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



Jordan

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From what i know, yes, never tried it though.

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Jordan

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I think gears should be made of steel and nothink else. What else can be case hardened?

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Jason G

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I reckon gears will be of some kind of steel. Not much knowledge on titanium, I know its light, but is it soft light ally?

On 19th Jan, 2010 wil_h said:
I would start the furthest place from the finish.


On 24th Mar, 2012 apbellamy said:
I feel all special knowing that I've given your mum my wood.


Been neglecting Turbo'd 'A' series..............


RogerM

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On 8th of Sep, 2007 at 05:53pm milamber said:
Slightly O/T....are all 998, 1275 gearbox casings the same?


Some of the earlier A+ cases used 4 bolts to hold the bearing retainer down ..... these are weaker than the 3 bolt type as the web cracks through the 4th bolt hole.

Other than that a a rod change case is pretty much a case ..... the remote type are rumoured by some to be of better material but I'd not put too much faith in that myself.

Every day is a school day ...........

How fast and how expensive ...... the same question...

On 27th of Sep, 2007 at 12:45pm Jimster said:

why do you you think I got a girlfriend with small hands?


Rob H

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Well that only goes prove I know nothing about material science.

Isambard Kingdom Brunel said:
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fastcarl

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On 8th of Sep, 2007 at 08:57pm Rob H said:
Well that only goes prove I know nothing about material science.


ha ha , your a very funny bloke rob,

you seem to put your foot in it at startingly regular intervals,lol


carl

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stevieturbo

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Has anyone ever welded bracing around the "4th" hole on the A+ boxes to try and stop them cracking too ( I know they dont have the hole )

Also...I think cryo treatment of the gears is something that should be tried in the search for strength.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will


Miniwilliams

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roger i agree, wearing isn't the issue, as mine break and there aren't really worn.

Steve, i'm going to have to try something like cryothis year/Next so i'll let you know. I've got to do some thing i just don't know what sort of treatment yet.

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fastcarl

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On 9th of Sep, 2007 at 11:56am Miniwilliams said:
roger i agree, wearing isn't the issue, as mine break and there aren't really worn.

Steve, i'm going to have to try something like cryothis year/Next so i'll let you know. I've got to do some thing i just don't know what sort of treatment yet.


the treatment you need matt is to loose a whole chunk of weight from your car and the box will undoubtably last a lot longer,

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Dangerous

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On 8th of Sep, 2007 at 07:48am Rob H said:
A bit of saturday morning food for thought.

I was reading through a old copy of mag and it featured Werner Stommel's turbo (one of my favorite modified minis) which appartently runs a titanium gearset.

I reckon it was a titanium gearbox casing


Metro turbo weekend driver,Mini turbo in the making again!



Miniwilliams

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You are so Right Carl. But there you go :(, I like a "little" comfort in my car, never say never though.

Yes Danerours I can see that being what may have been used.

Best 1/4 mile 13.2 seconds @116 mph
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First 5 port miniturbo to make over 200 bhp on Injection?

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Tom Fenton
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Ti gearbox casing?!

Why would anyone bother, it would most certainly be heavier than the standard one, and an absolute nightmare to make.


On 29th Nov, 2016 madmk1 said:


On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else


Like fuel 😂😂


fastcarl

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leeds/wakefield.

Ti casing not in our lifetime,
it woukld cost the price of the avergage house to have made.
carl

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Jordan

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Cryo gears have been proven in rally cars.
Best bet Matt that you may get at least some fun in your mini without hearing "crunch!!!!"

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Sir Yun

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hi.

From what i have seen (i actualy read engineering textbooks for fun..hmmmm) the failure modes of teeth are basicly:

A*surprised*verload
(flat plane fractured surface)

B:Fatique

(about 30 degrees down into the cog forming an arched breaking surface to the other side of the tooth root) .

A: is basicaly caused by too much torque (in a way you should be happy about this *wink* or impact loading..full bull 5500 rpm launches come o mind

B:
is dependent on crack initiators (nicks,cuts..think cutting glass as the basic idea)

resistance is increased by case hardening (hard on the outside, softer on the inside and the outside is held under compression the the core pulling inwards after treatment) by any of the available methods.


now..after that service anouncement..

why the heck are straight cut boxes stronger.. because all things being equal they should be less strong.

the tooth root is smaller vs a equaly wide helical gear. the loading is in all likelyness more dynamic (both due to the line contact a spur gear makes.(.i.e. it either touches or not, making for a rather jolty contact) AND due to the clearances present in yeh run of the mill gearset..(positively chatterey)

did anyone research the tangent of heat treating a set of normal helical gears to a really high standard.. then building a box with proper clearances ??

well it is just a thought.

That sir, is not rust, it is the progressive mass reduction system

http://aseriesmodifications.wordpress.com/


Jordan

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They have a wider web at the bottom dont they? Nearly every helical gear ive seen broke on here is close to or at the bottom of the gear tooth.

Lengthen the life of bearings due to not as much side load.

Edited by Jordan on 16th Oct, 2007.

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