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mini4350
 Post subject: gearbox suggestions
PostPosted: Tue Oct 18, 2005 10:51 pm 
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848cc
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Joined: Sat Mar 20, 2004 1:12 pm
Posts: 135
Location: perth
hey guys im looking at building at building a 1275 with a blower and wondering what suggestions to do interms of gearbox. Im not sure what i have to do to the gearbox to handle the power it will put out. Any suggestions?

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hope be back on the road soon with a blown 1275.
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willy
 Post subject:
PostPosted: Tue Oct 18, 2005 10:53 pm 
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Joined: Mon May 03, 2004 6:46 pm
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Location: ADL
Nothing.
Maybe a 4 pin diff.

The gearboxes themselves are fairly strong, if in good condition.
Its the diff that is the weak point, especially with prolonged thrashing and moreso with forced induction.
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mini4350
 Post subject:
PostPosted: Tue Oct 18, 2005 10:55 pm 
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Joined: Sat Mar 20, 2004 1:12 pm
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Location: perth
what about interms of a clutch?

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hope be back on the road soon with a blown 1275.
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Spaceboy
 Post subject:
PostPosted: Tue Oct 18, 2005 11:04 pm 
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you'll want a heavy duty clutch, yeah diff is a good idea..
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poeee
 Post subject:
PostPosted: Tue Oct 18, 2005 11:07 pm 
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Joined: Tue Mar 16, 2004 8:55 am
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Location: Geelong, Victoria
Borg and Beck Cooper S clutch.

Mine was still like new when the gearbox kacked itself. It's back in there, and my spare clutch kit goes back into the cupboard!

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willy
 Post subject:
PostPosted: Tue Oct 18, 2005 11:09 pm 
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Location: ADL
Orange dot is the way to go.
Good for something up to 90bhp or so.
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hutto
 Post subject:
PostPosted: Tue Oct 18, 2005 11:17 pm 
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Joined: Mon Jan 31, 2005 6:11 pm
Posts: 655
Location: South Aussie
what about whos crutch? :?

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drmini in aust
 Post subject:
PostPosted: Wed Oct 19, 2005 6:48 am 
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Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39762
Location: near Baulkham Hills, NSW
Make sure you rebuild the box before throwing a blown motor on top.. weak points are the diff as said, and also the layshaft & its needle bearings.
If you can't affors a cross pin diff, at least fit a competition diff pin and 2 new spider gears...
Orange dot clutch is the way to go, but do a trial assembly of flywheel/clutch before fitting, to ensure the diaphragm is near flat when it's clamped together.
Have a read here-
http://www.minimania.com/web/DisplayID/ ... ticleV.cfm

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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