j just dont take the car to redfern and say the gear box has a wine
makka
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| How much power can a gearbox handle https://www.ausmini.com/forums/viewtopic.php?f=2&t=6456 |
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| Author: | mini4350 [ Mon Apr 18, 2005 2:09 pm ] |
| Post subject: | How much power can a gearbox handle |
as the topic says i want to know how much power a normal mini gearbox can handle n what has to be done to make them handle more n not break as i am lookin at building a pretty hard 1275cc. |
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| Author: | kazjim [ Mon Apr 18, 2005 2:25 pm ] |
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Well, my DEAD STOCK Rod-change is handling over 100HP @ Crank.... Ok, its getting a bit whiney, but then again, its never been rebuilt, just a "kerosene rebuild" last-time the engine was out. . . . . Oh, and its on a Turbo 998, so it is making some pretty impressive torque high in the rev-range...... J |
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| Author: | mini4350 [ Mon Apr 18, 2005 2:31 pm ] |
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well i am aiming for about 120hp @ the wheels with my supercharged 1275cc. Thats why i ask cause i want to know what problems to expect. |
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| Author: | min13k [ Mon Apr 18, 2005 3:40 pm ] |
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j just dont take the car to redfern and say the gear box has a wine
makka |
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| Author: | drmini in aust [ Mon Apr 18, 2005 4:08 pm ] |
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I've got ~120HP at crank, thru a Mk2 S box.. `boostedmini' (1360 Metro turbo) has ~140HP at crank, thru a Mini-K box, no problems yet. KAD twincams have up to 200HP at crank, and run a straight cut Mini box. A lot depends how big and sticky the tyres are, and how sympathetic you are to the box. 
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| Author: | mini4350 [ Mon Apr 18, 2005 4:30 pm ] |
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oh ok cool. well im aiming for about 100-120 hp @ the wheels. So i shouldnt have to do anything to the box for a while then. |
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| Author: | drmini in aust [ Mon Apr 18, 2005 4:55 pm ] |
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mini4350 wrote: oh ok cool. well im aiming for about 100-120 hp @ the wheels. So i shouldnt have to do anything to the box for a while then.
No, provided you build it properly- all new bearings & layshaft, etc. Diffs are a bit weak for lotsa power. Make sure you fit a competition diff pin & 2 new planet (spider) gears, at least. Or a 4 pinion diff.... 
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| Author: | kazjim [ Mon Apr 18, 2005 5:02 pm ] |
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Thats what Kev reckons anyway. . . . 
Mine is a FLOGGED OUT CLubbie Rod-Change, whines like a dog on heat, crunches like a box of corn chips, and pops out of second at the slightest breeze ....... But its still Perfectly Good !! 
Seriously, I'm about to order the "nasty rebuild" kit from minispares with the Competition diff pin, all bearings and gaskets.... Might even ask the good Dr to put it together for me ..... I'll have to do this before going to "the next level" I think . . . . . J |
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| Author: | Lillee [ Mon Apr 18, 2005 5:14 pm ] |
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Careful James, apparently that gearbox rebuild kit is out of stock. You might have to order the parts separately. 
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| Author: | gafmo [ Mon Apr 18, 2005 6:44 pm ] |
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min13k wrote: j just dont take the car to redfern and say the gear box has a wine
makka You are a Shocker 
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| Author: | mini4350 [ Mon Apr 18, 2005 7:07 pm ] |
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so in other words my good one that iv got now thats running i should rebuild for the bigger motor or leave it as is??? If i have to rebuild how much would it cost me??? |
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| Author: | drmini in aust [ Mon Apr 18, 2005 7:16 pm ] |
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mini4350 wrote: so in other words my good one that iv got now thats running i should rebuild for the bigger motor or leave it as is??? If i have to rebuild how much would it cost me???
I would strip and check it. Could cost you $200-700 for parts, depending what (if anything) is on the way out. I bet the layshaft and its bearings are wearing out, for starters. They all do, except the A+ ones.
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| Author: | justminis [ Mon Apr 18, 2005 8:56 pm ] |
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Pay particular attention to ALL the running clearances, especially the idler gear. What box is this btw, remote or rod change? As Kev says, if remote, the layshaft will need replacing. And don't forget the diff, really should be looking at 4 pin (cross-pin) diff with that sort of power. |
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