Looking at the Hewland box - wouldn't it be possible to "just" move the input gear to the other side (resp. towards the front of the 'box) and get rid of the extra gear?

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It's all to do with rotation direction. Looking directly towards the gear set from the clutch end.
1 the crank rotates anti-clockwise
2 the idler gear is clockwise
3 the outer gear[original input gear] is anti clockwise. The mini main shaft is two piece so 1st to 3rd drives thru lay shaft via the 4th gear, then this reverses direction and then back again from 1st to 3rd , and in 4th it is a straight drive.
4 the inner gear on the hewland is fixed to the shaft and the shaft is two piece like mini so that gear is like the 4th gear in a mini and the input shaft[like lay shaft in mini] is giving the opposite rotation

The set-up in the hewland the inner gear and the gear it drives can be changed to give different ratio from crank to gear box input drive.
The bike shafts are complete shaft with out a seperate section ,so the whole shaft rotation has to be reversed.

I did look at that system that hewland use, but with a complete shaft the drop gears need to give the different rotation. For the test set up I am just modifying the std drop gears and if it all works then I will set up my gear cutting attatchment and make a complete set of drop gears including a new crank gear. I am going to take it one step further and make the gear a double helical[herringbone type] so they are two opposite helical gears as one. They will take a lot of power but there is no side thrust like a single helical gear. The crank gear will run on needle roller bearings instead of bronze bushes.

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That is exactly what I was thinking.

So is there enough room at the bottom of the drop gear casing around the input gear to fit a large enough gear, or do you have to modify it for the space?

cheers
michael

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the world is a book, and those who do not travel read only a page
66 Mini Minor sponsored by http://www.lifeonthehedge.com.au/ The Dog Harness Specialists
It was a pleasure ausmini. I'll miss all you misfits and reprobates

Mick, The input gear diameter overlaps the web at the bottom of the case just above the sump plug. the star wheel for the selector drum is just above it, so I am welding a new rib onto the case above the sump plug and this runs verttical to about 3" and then back to the original web.
The outer case has a bit welded to it to suit and some new holes drilled and tapped to mount to the extension.
The selector drum runs across the box just below where the bracket is to hold the oil pick up pipe.
The other mod. is the oil pick up pipe as the original won't fit. The new pipe is mounted to the hole at the back of the box ,but runs down against the rear case in the middle of the shaft[gears are smaller dia., 5th&6th] and then into the bottom of the box. The strainer is basically in the center of the box and I am fitting a cover so that as the oil is aerated by the gears the pick up is in a weir arrangement so that it does not pick up aerated oil and not subjected to oil surge.

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Research is the difference between speculation and investment. Anyone who copys some one else will always be second
www.minisprintgt.com

brilliant as usual

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the world is a book, and those who do not travel read only a page
66 Mini Minor sponsored by http://www.lifeonthehedge.com.au/ The Dog Harness Specialists
It was a pleasure ausmini. I'll miss all you misfits and reprobates

I don't think any post of this sort is ever pointless, and the conversation that followed... Priceless.

Oh, yes. I see! Damn directions...

Unless... Different rotation could be given at the other end, diff end, of the gearbox! Like; adding a idler gear between crown & pinion. This in turn makes it possible to swap places of main & laygear and drive it as was on the primary gear side. Or drive the diff via a chain, why not? Or am I overseeing something again?

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No speakers, no bodykits, no six-inch spacers, no spak filler, no bullshit

Mmmmh - shouldn't it be possible to reverse the A-Serie's running direction with a K head? Symetrical cams and all that (which makes it possible to use it on a A-sereis in the first place!)...

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No speakers, no bodykits, no six-inch spacers, no spak filler, no bullshit

could you just get a box made bigger to fit gears? there is still a bit of room under the mini?

I could reverse the direction with a honda head but I want to design it so that it can be bolt to a std mini engine.

I looked at hi-velocity chain drives BUT not too sure about them.
With the gear set up I am designing it so the 2nd idler can be repositioned and then the ratio from the crank to the input drive can be changed.

The honda cbr 1000, 900,600 and vfr 750,800, all have the same shafts and the gears are interchangable. With the std bike gears and the many different ratios available you can just build a box with the gear ratios and input drive ratios you want.

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Research is the difference between speculation and investment. Anyone who copys some one else will always be second
www.minisprintgt.com

Ask Warwick Agustin about his chain drive on his 4AGE sports sedan. I runs from the primary gear to the input gear, so is always running at engine revs. His has been running for close to 20 years now, so any problems and he will know about them.

cheers
michael

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the world is a book, and those who do not travel read only a page
66 Mini Minor sponsored by http://www.lifeonthehedge.com.au/ The Dog Harness Specialists
It was a pleasure ausmini. I'll miss all you misfits and reprobates

Austin 1800 automatics had a Hi-Vo chain drive to the BW auto. They made heaps but I'm not sure if they gave problems.

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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.

Hi just interested to know why the remote change box in the pic has a spring on the knuckle joint?

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998 SC12 61atw

they probably had to machine away the spot where the normal reverse spring lives

Has anything eventuated in regards to this thread in the past 4 months? I like where it was going...5spd overdrive mini compatible gear sets - welcome to the 21st century...

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