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| Gearbox upgade info https://www.ausmini.com/forums/viewtopic.php?f=2&t=85711 |
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| Author: | Scoop [ Sun May 18, 2014 12:02 am ] |
| Post subject: | Gearbox upgade info |
Hi guys, I would like to know what is recommended when rebuilding a gearbox to go under 100+hp? The casing is a 22G1228. I will obviously replace bearings etc but what about bulk rings? Is there anything that needs to be uprated for the torque? Standard type diff or X pin? Any advice would be appreciated. Thanks |
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| Author: | drmini in aust [ Sun May 18, 2014 8:11 am ] |
| Post subject: | Re: Gearbox upgade info |
I've got north of 125HP at the crank, and I'm running stock drop gears, Mk2S gearbox, 3.647 diff, with a comp diff pin and spider gears. All bearings were replaced, and the baulk rings were back ground .020" for greater life. It's only a road car; for khanas etc you would want a 4 pin diff at least, or a Quaife. If buying new baulk rings I would try them on a gear for fit. If they rock about, do not buy them. They will be worn out before bedded in. New current baulk rings from Minis Plus and Karcraft seem OK in this regard. |
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| Author: | Scoop [ Sun May 18, 2014 8:34 am ] |
| Post subject: | Re: Gearbox upgade info |
What part of the baulk ring do you take the .020" off? Do you need to do anything special with the drop gears? You seem to have a lot of handy little mods for making everything better! |
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| Author: | drmini in aust [ Sun May 18, 2014 10:51 am ] |
| Post subject: | Re: Gearbox upgade info |
A standard baulk ring is about 0.350" thick, It is about .040" clear of the gear dogs when new. It will stop working when there is no gap left. The very best baulk rings were the forged steel ones made up until ~1970. These had forging lines and sometimes cutter marks on their periphery. Since then, most are pressed in a sintered powder process, some are better made than others. You can grind .020" off the FLAT face of the ring that goes towards the gear, to get more life. provided it is at original thickness. Helical drop gears are fine (and quiet!) on a road car, I've not had any problems at all. Just check the primary gear and idler gear end floats are within spec, I use .004-.005" for both. If assembled much too loose, the end thrust can wear the gearbox case or break the primary gear's bronze thrust washer. |
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| Author: | Scoop [ Sun May 18, 2014 11:39 am ] |
| Post subject: | Re: Gearbox upgade info |
Thanks for the info Doc. Your a big help. |
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| Author: | drmini in aust [ Sun May 18, 2014 11:45 am ] |
| Post subject: | Re: Gearbox upgade info |
If rebuilding the gearbox I put new idler bearings in unless changed recently. They are cheap. But if neglected and they wear right out it can stuff the flywheel housing, the gearbox case or both. |
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| Author: | Scoop [ Wed Jul 02, 2014 9:28 pm ] |
| Post subject: | Re: Gearbox upgade info |
Another gearbox related question, does anyone know what comes in the gearbox bearing kit from Karcraft? Its only $150 odd dollars. When you look at bearing prices from other suppliers it seems really cheap. I need to replace every bearing as it had bearing failure that went through the whole engine  I would have to buy diff bearings and idler bearings also but want to make sure I get everything required. Cant just go down the road and get a forgotten part down here. |
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| Author: | drmini in aust [ Wed Jul 02, 2014 10:52 pm ] |
| Post subject: | Re: Gearbox upgade info |
I know it includes all the gearbox bearings, but not the 2x idler gear needle rollers. They are extra. I am not sure about the 2x diff bearings, I think they are extra also. Ring and ask. 
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| Author: | Scoop [ Wed Jul 02, 2014 11:00 pm ] |
| Post subject: | Re: Gearbox upgade info |
On tomorrows to do list. |
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| Author: | FNQ [ Thu Jul 03, 2014 8:06 am ] |
| Post subject: | Re: Gearbox upgade info |
Slight thread detour, any comments, thoughts experience with the new roller type idler gear bearings available now fromMed/ Swiftune ( each slightly different i think) |
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| Author: | timmy201 [ Thu Jul 03, 2014 10:07 am ] |
| Post subject: | Re: Gearbox upgade info |
I asked them the same thing a few weeks ago: MSG20 G/BOX OVERHAUL KIT - MINI (4 SP SYNCRO)(NO DIFF PARTS) 1.9000kg 13H7848 <B> BEARING - IDLER GEAR - MINI - ALL SYNCRO HYL8473 <A>. BEARING - VARIOUS - LAYSHAFT - MG MIDGET+MINI (ROLLER) x 1 HYL3616# <B> GASKET SET - SUPPLIMENTRY - MINI x 1 HYL3614 <B> GASKET SET - G/BOX - MINI x 1 22G931# <B> LAYSHAFT - MINI (ALL SYNCR)(UK MADE)(64 ROCKWELL) x 1 AAU1365 <A> BEARING - MAINSHAFT - MINI (DOUBLE ROW) x 1 ADU7619 <A> BEARING - 1ST MOTION - MINI - ALL SYNCRO x 1 HYL8474 <A> BEARING - 1ST MOTION - MINI - 3 SYNCRO+ALL SYNCRO x 1 CHM141 <A> BEARING - LAYSHAFT - MINI - ALL SYNCRO (ROLLER) x 2 22G2033 <B>. BAULK RING - VARIOUS - AH SPRITE+MINI x 4 |
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| Author: | drmini in aust [ Thu Jul 03, 2014 10:33 am ] |
| Post subject: | Re: Gearbox upgade info |
Timmy that's the gearbox overhaul kit you listed. The bearing kit `KIT4SYNCHRO' has no idler bearings, I bought one recently. |
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| Author: | timmy201 [ Thu Jul 03, 2014 11:28 am ] |
| Post subject: | Re: Gearbox upgade info |
drmini in aust wrote: Timmy that's the gearbox overhaul kit you listed. The bearing kit `KIT4SYNCHRO' has no idler bearings, I bought one recently. Oops. It's the $330 kit less diff parts. If you were doing a gearbox overhaul you might need the rest of these bits anyway 
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| Author: | simon k [ Thu Jul 03, 2014 3:07 pm ] |
| Post subject: | Re: Gearbox upgade info |
at least get a cross pin diff - a new "competition" diff pin and new spider gears still isn't as good as the originals... they'll wear out pretty quickly and start shoving crap through your motor |
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| Author: | Scoop [ Thu Jul 03, 2014 9:46 pm ] |
| Post subject: | Re: Gearbox upgade info |
So I rang karcraft and got the info I required. Thought it was to cheap to have all the bearings for the gearbox. AAU1365 <A> BEARING - MAINSHAFT - MINI (DOUBLE ROW) x 1 ADU7619 <A> BEARING - 1ST MOTION - MINI - ALL SYNCRO x 1 HYL8474 <A> BEARING - 1ST MOTION - MINI - 3 SYNCRO+ALL SYNCRO x 1 CHM141 <A> BEARING - LAYSHAFT - MINI - ALL SYNCRO (ROLLER) x 2 HYL8473 <A>. BEARING - VARIOUS - LAYSHAFT - MG MIDGET+MINI (ROLLER) x 1 |
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