What defines "large offset" on the drive gear?

Is it possible for a drive dog to be fitted to the shaft 180deg out?

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

Uuumm no. That's why there's an offset.

If you look at the top of the drive it has a slot. One side of the slot goes through the middle of the drive while the other side is obviously offset from the centreline. This means that one segment of the circle you see when looking straight down on the drive is larger than the other.... ie the slot is offset on one side.

However, if you don't use the proper logic in setting up the timing and just rely on the falacious logic that No1 plug lead connects at "2 oclock" then .. yes, the timing can be 180 degrees out.

Cheers, Ian

Yeah, when i measure the offset and have the drive gear installed per the manual instructions with the larger segment (0.060" ish larger by my calipers) on top, this results in the no 1 position being 180 deg out. i.e. at 7 oclock instead of 1 oclock.

The pin on the drive dog on the distributor shaft has some marks indicating it has been knocked out at some point by someone. If this could be 180 deg out, then it would explain the oddity above. I take it the shaft and dog don't have a particular indexing like the dog to drive gear offset.

Need to know because i have a new electronic distributor on its way and i want to set it up to receive correctly.

cheers
michael

_________________
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

Dizzy to drive shaft can only go one way. Drive shaft to cam can go on any tooth. Doesn't matter which one.
One of the manuals or maybe vizard book has incorrect instructions to have large offset upwards to result in no 1 lead pointing to plug 1. (2 o'clock)
To rough time it. Rock no 1 to tdc on fire stroke, and rotor button should point to this lead. Then dynamically time it or use test light.
It doesn't matter what cam tooth you set dizzy on but having number 1 lead at 2 o'clock gives the neatest plug lead layout IMHO.
Hope this helps.

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The formula for the length of a piece of string is simple: Twice as long as from one end to the centre!

The most common mistake is that when using the workshop manual, you time the camshaft in with no.1 cylinder rocking. The instructions for fitting the distributor drive into the block is for no.1 cylinder firing.

So if you have just timed the cam in and go to put the drive in without changing anything, you will be 180degrees out

The dog has obviously been fitted to the dizzy 180deg out.
You can turn it around, but will have to stick a 3/16" drill through both, or the drive pin won't fit properly, as the hole is never drilled dead thru the centre of the shaft.
This is the case with all Lucas dizzies, the Chinese made ones may be better if CNC machined.

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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.

I had always thought the partial offset was deliberate!

Pfft...the british..

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

Yes. Probably designed to ensure excessive wear by off-balancing the rotating mass.

Thanks Kev. Most of the other responses seemed to neglect the question about the dog to shaft alignment. I suppose they assume that the dog is permanently fitted to the shaft.

New cap is side entry so if it is 180 deg out the leads will point downwards!

I got one of Tony's 45D electronic jobbies, so it should be good. Not sure where his are made, but at least if there is an issue he is only a phone call away. He has not got his equivalent of the accuspark black box up and running yet, so i will have to get one of those shortly.

cheers
michael

_________________
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

Michael, I'd be inclined to leave the dog as is and just turn the dizzy driveshaft 180deg. Who would know...

_________________
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.

More concerned about the new one than the old at this point.

_________________
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

Just swap the plug leads around. It isn't rocket surgery.

It is possible to assemble a dizzy so that it is 180° out internally.

I'm keen to try fitting up one of these from Convertible Mini. They're in country now?

_________________
SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

He has not got his equivalent of the accuspark black box up and running yet

for clarity, i will be getting the accuspark shortly

_________________
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 know. Lived with it 180deg out for 6 years. Even won class victory in NL with it that way so it can't be all bad.

Just want the new one to be the right way round for novelty.

cheers
michael

_________________
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