When a known engine build formula is used, dizzies can be churned out with the relevant advance curve to suit - as in standard production engines. Terminology - Dizzy - Distributor When a known engine build formula is used, dizzies can be churned out with the relevant advance curve to suit - as in standard production engines. Reading the 'dizzy working basics' article defines what the dizzy does and how. It's pretty obvious then that any changes at all in the original engine specification is likely to require a different advance curve. This is where most folk fall down when completing the ‘build for power’, by assuming that an alternative dizzy from a sportier or similarly powered engine will do the trick.A simple illustration is folk's preoccupation with sticking a 'S' dizzy into anything tuned in the belief this is the way to go. It's not. It's likely to be as useful as the one you have. Read more

The specter of 'unleaded fuel only' - instigated in UK on January 1st 1999 and seemingly from decades ago across the rest of the world - seems to be forcing more and more folk into frightened, panic orientated action. And Mini owners are featuring heavily in this. Read more

This is to help those floundering in an unknown sea of techno-babble and 'magical' cures… Part No Applications: C-AHT288, CAM150, CAM151, TAM1617, CAM4545, 51K1193, TAM1521, GEG300, C-AHT188, C-STR1057, A regular visitor to the message board, and something I am asked frequently about in my other incarnations for other technical media. Generally when something has gone badly wrong! Many folks have just as many ways of dealing with the following subjects - all can and will claim their way has worked for them for the proverbial millennia - so a few words as a basic reference and guide as I see them; we all know there are always exceptions to the rules. This is to help those floundering in an unknown sea of techno-babble and 'magical' cures… Read more

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Since the reasonably recent publishing of a certain Mini tuning, performance and maintenance guide that has strangely coincided with a batch of new readers/devotees of a certain prolifically quoted 'bible' on A-series engine modifications - the subject of all things cylinder head have bounced into the fore once more.

Something I was heavily canvassed over at this years (2003) Mini in The Park event whilst doing duty as Mini 'agony aunt' and 'doctor'… In particular the subject of the combustion chamber was foremost in discussion since the aforementioned 'guide' exhibited a number of wildly different chamber profiles with very little in the way of supportive technical information. Now, I have considered the pros and cons of doing this missive. On one hand, I am not out to increase sales of said guide since I'm not one of its supporters in any way. On the other I am certainly not attempting to belittle the efforts of the featured company as they have long been at the forefront of performance A-series engines and components... Read more

I recently had one of my best mates to stay for a week. Don't get to see him very often, so when we're together we spend most of the time pontificating on all things A-series since he's a long-time Mini enthusiast too. Well, at least from a racing point of view. Anyway, of the various subjects covered one that prompted me into doing this little piece of verbiage was that of compression ratios (CR).

It's another for those subjects where folk can be heard waxing lyrical about their personal recommendations for CR levels, or stipulating hard and fast 'facts' about CR required for certain camshafts. And again, it's one of those generally misunderstood areas of engine tuning. So I'm going to try and cut through the haze a bit.

CRs are generally spoken about and quoted in reference to the 'static' ratio. That is a bunch of calculated or measured volumes calculated by means of an equation. Read more

Drive Strap Alignment If the pressure plate clutch plate friction face needs re-surfacing, get it machined to clean it up. Make sure the engineering company doing the job records the amount taken off as once done, the recorded amount needs removing from the tops of the 'horns' that stick up to ensure proper clamping force is achieved. If this is not done, clutch slip is inevitable. If using a pressure plate of unknown history, it is IMPERATIVE the clutch drive straps are set at the correct height. Many get this wrong and end up with a slipping clutch for some seemingly unfathomable reason. The following should also be carried out if the flywheel has been machined, or of unknown history also: Place the pressure plate 'horns' upper-most on something to hold it off of the work surface but not interfere with clutch plate or flywheel. Place the clutch plate in position, with the protruding primary gear spline boss on the underside facing the work surface Place the flywheel in position. Read more

Completing this change successfully, easily and neatly is pretty straightforward on a Mini. The alternator contains the regulator and cut out functions within it’s casing, so makes the regulator box used with a dynamo redundant.

Part No Applications: GEU205, GEU205MS, GEU207, GXE2297
However, it is useful to retain the box itself and it’s connectors. It acts as a terminal box to make the installation neat, avoiding the messy and awkward soldering/taping together bunches of wires. It also maintains a period look, plus makes reversal easy should this be needed in the future.

Disconnect the battery and remove the black regulator box from the car - taking care to make a note of or label each wire removed with it’s original terminal connection. Fit the alternator using the necessary rear support bracket (part no. 12G1053) as the alternator is shorter than the dynamo. The relevant belt (GCB10825) is also needed. Read more

Adverse Effects of Fitting Wide Wheels part numbers: C-AJJ3359 Terminology used: KPI - King Pin Inclination KPO - King Pin Offset LSD - Limited Slip Differential In the 'Suspension - Terminology' section, I covered what KPI is, as it is an ancient but still oft-used term despite being pretty redundant. Not that it isn't attendant in current cars - it has to be. It's just that the mass car manufacturers have settled the angle at which it is set down to a fairly universally used envelope, and there's nothing the individual can do to alter it without entirely re-fabricating the hubs of drastic surgery on the existing ones. So is, to all intents and purposes, fixed. Even the most technically advanced race teams can do little more than keep a wary eye on what it is doing when playing with suspension set-up. Read more

Concerned about fitting up-rating parts to injection engines? A short while ago I had several conversations via e-mail with folk abroad who were a little concerned about fitting up-rating parts to their injection engines - like one of the many 'GSi' tuning kits available. A rumour had been put about that fitting this kit caused engine damage. Closer questioning culminated in the rumour saying that the high lift (1.5 ratio) rockers were causing camshaft and valve/guide damage. You know me - I can't let things like this alone until I find out the root cause. After some more digging and goading, I believe I've found the problem.

Cam damage is usually caused by something amiss in the valve train - obviously. Since the engines concerned were as they came from Rover and had done many thousands of miles without issue, it had to be something to do with these kits. Read more