ausmini :: View topic - Correct advance plate for a 29D Mk2 S dizzy

The Advance Curve should be as follows;-

Dist RPM Dist Advance
325 1 Deg
415 3
500 5
2000 10
3500 15 (Max Advance)

Am I understanding this right, you are saying that the dizzy shouldn't reach full mechanical advance until 7,000 crankshaft rpm?

Fair enough. I'm just thinking back to when I got my dizzy recurved and I think the advance was all over by about 4,000 rpm (crankshaft).

Just out of interests sake, what does mr haynes (or whoever) say the static timing should be for a Mk 2 'S'? (just for interests sake so I can see how many degrees of advance total there would be for a engine spinning to 7k).

The point at which total advance is reached varies wildly depending on the dizzy type you have if you take a look at the attached documents. Here's two of the pages out of the Australian addendum workshop manual I have. But strangely enough there's no 29D non vac advance dizzy listed in my manual.

The manual is dated 1970, but may not have had the extra documents added....however there is a 29d listed for the morris 1100 saloons and sedans..there is a 29d there even though its a little difficult to read.

Author:	Mick [ Sat Dec 05, 2009 3:34 pm ]
Post subject:	Correct advance plate for a 29D Mk2 S dizzy
I'm just digging through my dizzy collection, and have a mechanical advance 29D (Mk2 S) with a 10 degree advance plate advance fitted, and a spare drive in my parts box with 13 degrees labeled. Which would be the correct drive for the MK2 S dizzy? I would have thought it to be the 13 degree right??

Author:	Mick [ Sat Dec 05, 2009 3:47 pm ]
Post subject:
I've been through my blue BMC workshop manual, but it only mentions the Mk1 S dizzy (23D4?)..

Author:	GT mowog [ Sat Dec 05, 2009 3:51 pm ]
Post subject:
Yeah, your guess is right, 13 degree, Part Number 62411183. EDIT I made a booboo, it should be a 15 degree plate for the Aust Lucas 29D4 Dist P/N (of the dist) AYG 0175

Author:	Mick [ Sat Dec 05, 2009 3:53 pm ]
Post subject:
Cheers, now I have something to play with this afternoon

Author:	GT mowog [ Sat Dec 05, 2009 3:56 pm ]
Post subject:
The Advance Curve should be as follows;- Dist RPM Dist Advance 325 1 Deg 415 3 500 5 2000 10 3500 15 (Max Advance)

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Correct advance plate for a 29D Mk2 S dizzy https://www.ausmini.com/forums/viewtopic.php?f=2&t=59333	Page 1 of 2

Author:	1018cc [ Sat Dec 05, 2009 4:28 pm ]
Post subject:
GT mowog wrote: The Advance Curve should be as follows;- Dist RPM Dist Advance 325 1 Deg 415 3 500 5 2000 10 3500 15 (Max Advance) Am I understanding this right, you are saying that the dizzy shouldn't reach full mechanical advance until 7,000 crankshaft rpm? Shouldn't the advance be all over by 3,500-4,000rpm? Or is the cooper s just special? (just a question, not trying to be a PITA).

Author:	Mick [ Sat Dec 05, 2009 4:32 pm ]
Post subject:
According to my workshop manual, that is indeed at the dizzy rpm

Author:	sgc [ Sat Dec 05, 2009 4:32 pm ]
Post subject:
1018cc wrote: Am I understanding this right, you are saying that the dizzy shouldn't reach full mechanical advance until 7,000 crankshaft rpm? Yeah, that surprised me too...

Author:	1018cc [ Sat Dec 05, 2009 4:37 pm ]
Post subject:
Fair enough. I'm just thinking back to when I got my dizzy recurved and I think the advance was all over by about 4,000 rpm (crankshaft). Just out of interests sake, what does mr haynes (or whoever) say the static timing should be for a Mk 2 'S'? (just for interests sake so I can see how many degrees of advance total there would be for a engine spinning to 7k).

Author:	Mick [ Sat Dec 05, 2009 5:53 pm ]
Post subject:
The point at which total advance is reached varies wildly depending on the dizzy type you have if you take a look at the attached documents. Here's two of the pages out of the Australian addendum workshop manual I have. But strangely enough there's no 29D non vac advance dizzy listed in my manual.

Author:	GT mowog [ Sat Dec 05, 2009 6:01 pm ]
Post subject:
1018cc wrote: Fair enough. I'm just thinking back to when I got my dizzy recurved and I think the advance was all over by about 4,000 rpm (crankshaft). Just out of interests sake, what does mr haynes (or whoever) say the static timing should be for a Mk 2 'S'? (just for interests sake so I can see how many degrees of advance total there would be for a engine spinning to 7k). Not too sure on what engine you have (1018??) or what state of tune, but advance curves are like SU needles - for different engines and states of tune and even how you have your mixture set determines what advance curve you should have. Cooper S's and Clubman GT's as they left the factory were set to run on 100 octane and the dealers (if they did their job) were to set them for 'super' (96-97 octane). Factory Figures;- For 100 octane the MK II should be set to 2 degrees BTDC at 600 RPM and for 96 octane 3 Degress ATDC at 600 RPM. Yes there is a 5 degree difference here. The factory don't provide static timing figures and personally I wouldn't recommend them for anything other than to get your engine running so it can be set correctly.

Author:	GT mowog [ Sat Dec 05, 2009 6:03 pm ]
Post subject:
Mick wrote: The point at which total advance is reached varies wildly depending on the dizzy type you have if you take a look at the attached documents. Here's two of the pages out of the Australian addendum workshop manual I have. But strangely enough there's no 29D non vac advance dizzy listed in my manual. Mick, thats all MKI stuff.

Author:	Mick [ Sat Dec 05, 2009 6:14 pm ]
Post subject:
The manual is dated 1970, but may not have had the extra documents added....however there is a 29d listed for the morris 1100 saloons and sedans..there is a 29d there even though its a little difficult to read.

Author:	GT mowog [ Sat Dec 05, 2009 6:27 pm ]
Post subject:
Mick wrote: The manual is dated 1970, but may not have had the extra documents added....however there is a 29d listed for the morris 1100 saloons and sedans..there is a 29d there even though its a little difficult to read. Hmmmm.....curious, but not surprising. IMO despite how 'things' appear from the factory, have time and again shown me that the factory was an organised mess..... The figures I have come from the factory 'black book' with suppliments and was published 1976 / 77 ish. The suppliments cover the ADR 27A stuff and the tandam master cylinder etc. It does show (and it says) MKI and MKII disy data. It make no reference to engine nos for this data.

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Author:	drmini in aust [ Sat Dec 05, 2009 6:41 pm ]
Post subject:
1018cc wrote: Fair enough. I'm just thinking back to when I got my dizzy recurved and I think the advance was all over by about 4,000 rpm (crankshaft). Just out of interests sake, what does mr haynes (or whoever) say the static timing should be for a Mk 2 'S'? (just for interests sake so I can see how many degrees of advance total there would be for a engine spinning to 7k). These days with unleaded fuel, sporty cams, ported heads etc the advance should indeed be all in by 4000 rpm. If you drop a stock S dizzy in there, you will be unpleasantly surprised.