Application/installation
Created: July 26, 2007
Crankshaft Oil Seal Adapter - Install Instructions
Helpful guide in selecting the correct distributor
Created: January 31, 2006
This table can be used as a guide to selecting the appropriate curve for your particular application. Select either the standard engine specification, or if you have a distributor with a curve that works well already, you can read the Lucas service number from the side of the distributor body to match.
Tuning the A-Series Engine - Book Review
Created: February 22, 2006
The test of the book is written at such a level that it will allow people with little knowledge of the A-series engines and engine tuning to develop and grow their skills, while still being able to maintain the interest of those but probably the most expert engine builders to find interesting, ideas, techniques and technical information on every page.
Camshafts
Choosing The Right Timing Set For Your Engine
Created: March 25, 2014
Choosing The Right Timing Set For Your Engine
Why is a camshaft like the heater in your house?
Created: February 25, 2014
Camshaft selection can be as complicated as you like, but for the ultimate performance, even if that means best gas mileage requires that you consider the entire envelope that the camshaft will work within. Non-technical issues such as intended application (street, race, milage or??), budget, expected RPM range, etc must be considered along with technical things like compression ratio, Cylinder head and valve sizes, exhaust system, carburetion, etc.
Who is Kent Camshafts
Created: January 27, 2006
Established in the late 1970’s, Kent Performance Cams has grown from a fledgling idea nurtured by two engineers - Bob Munt and Bob Fry - into a world renowned specialist camshaft manufacturing team, a camshaft manufacturing house that was capable of producing competition engine components .
Kent Camshaft Timing
Created: January 27, 2006
Kent Camshaft Timing methods. For many years the most commonly used method has involved establishing top dead center (TDC) as a datum (zero degrees) and positioning your camshaft with its inlet valve at maximum lift at a given position relative to this datum.
Camshafts - Scatter cams, pros and cons
Created: August 31, 2001
This whole 'scattering' deal has befuddled many. The simple fact is the principle is very basic and easy; it's getting a cam with the right profile and figures applied to it that's the hard part.
Camshaft timing using a dial indicator
Created: August 31, 2000
Rotate crank so piston one is at the bore top (TDC). Fit timing gears 'dot-to-dot'. Set up DTI with stem resting on number one piston centre with a little preload. Rotate crank backwards slightly (anti-clockwise looking at the front), then gently forwards observing the DTI, watching where the needle stops before descending.
Duplex timing chain kit, C-AJJ3323
Created: January 30, 2000
The front plate will have to be countersunk as shown ‘X’ to take the screws CMZ407MS, which replace the existing hexagon-headed screws, which would foul on the timing chain. When using ‘A’ plus timing covers there is a small round pressing at the bottom which needs making flat to allow timing chain clearance.
Duplex timing chain kit, C-AJJ3325
Created: January 30, 2000
The front plate will have to be countersunk as shown ‘X’ to take the screws CMZ407MS, which replace the existing hexagon-headed screws, which would foul on
Duplex timing chain kit, C-AJJ3327
Created: January 30, 2000
The front plate will have to be countersunk as shown ‘X’ to take the screws CMZ407MS, which replace the existing hexagon-headed screws, which would foul on
Hydraulic Clutch Conversion Morris Minor C-COM100
Created: March 21, 2019
Hydraulic Clutch Conversion Morris Minor C-COM100 Installation Instructions
Created: January 30, 2000
This disk has a solid center with no springs or any other method of absorbing shock, thus it should not be slipped any more than absolutely necessary to get the car rolling (this is the reason you see film of race cars being pushed to get started)!!
Oil Coolers
Created: February 03, 2011
In the past, fitting an oil cooler was mandatory once an engine had been even slightly uprated. The main cause for this was the quality of Motor Oils available at that time. If the oil temperatures exceeded a specific point, then engine failure was almost guaranteed.
COOLING - How it works
Created: January 25, 2001
Very few understand just what the cooling system does and how it does it, and that incompatibility between the cooling system's capability and an upgraded engine can spell disaster for the new engine.
Cylinder Head
Do I need to do a Valve Job?
Created: April 25, 2014
Most motors will go at least 80,000 miles before "needing a valve job"! But what are the signs? How do I determine if I really need it? Do I do it myself or pay a local machine shop.
Valve Stem seals
Created: January 15, 2014
Valve stem seals
CYLINDER HEAD - Torque-down and head gasket problems
Created: July 11, 2001
First a brief word on head gaskets. If it is not a genuine Rover or Payen gasket, don’t use it.
MSE4 - Post 1992 unleaded stage 2 (Road Rocket) large-bore head
Created: October 23, 2000
Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively re-worked. Stone-ground finish in ports promotes ultimate fuel atomisation. Three-angle valve seats in head. Cooper S size valves with current maximum flow profiles and Tuftrided for durability/longevity when used with unleaded fuel (hence 'black' finish).
MSE6 - POST 1992 unleaded stage 2 (Road Rocket) large-bore head
Created: October 23, 2000
Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively re-worked. Stone-ground finish in ports promotes ultimate fuel atomisation. Three-angle valve seats in head. Super-quality MG Metro valves modified to increase airflow.
MSE3 - PRE 1992 unleaded Stage 2 (Road Rocket) large-bore head
Created: October 20, 2000
Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively re-worked. Stone-ground finish in ports promotes ultimate fuel atomisation. Three-angle valve seats in head. Cooper S size valves with current maximum flow profiles and Tuftrided for durability/longevity when used with unleaded fuel (hence 'black' finish).
Austin MIni CYLINDER HEAD - Valves; shapes, materials,& finishes.
Created: October 19, 2000
Many moons ago, the standard performance valve shape was the then-ubiquitous 'penny-on-a-stick' profile. For the very good and simple reason it minimised airflow obstruction by having the least amount of material in the way. Very plausible, and a design that many have stayed with to this day
Rocker Gear
Created: January 30, 2000
The new generation of short period, high lift cams have been developed to give the best results in large bore engines when used in conjunction with 1.5 ratio, hi-lift rockers. For the small bore range, the stock 1.3 ratio is optimum. In certain instances ratios of 1.7 to 1 are of benefit - but is really only applicable to fully developed race engines.
Cylinder Heads Identification, Austin, Midget, Sprite, Morris
Created: January 30, 2000
Everybody has their own opinion on this subject. The most experienced people will tell you that the best way to maintain your engine performance is to accept the fact that valve jobs need to be done 2 or 3 times more often than rings and bearings! And this data base was concluded when leaded gas was the norm! Now that unleaded is all you can get, valve jobs are needed even more often! The purpose of a valve job is two fold; first the valve seats. The impurities in the air and gas often get trapped between the valve and the seat in the head; under worst conditions stopping the valve from closing, but more commonly being smashed enough to allow just a little seepage of hot gases.
Electrical
HOW TO CONVERT FROM GENERATOR TO ALTERNATOR
Created: September 16, 2005
Minis built up to 1969 (i.e. MKI  &  MKII) were positive ground while MKIII and onwards were built negative ground. The polarity of the alternator can not be changed, so if the alternator you have does not conform to your car, you must change your car. 
DISTRIBUTORS - working basics.
Created: September 15, 2000
To maximize power and economy potential from any engine, burning the compressed fuel/air mixture at precisely the right point throughout the engines entire rpm range is essential. This ‘point’ is generally somewhere before the piston reaches TDC on its power stroke described in degrees - i.e. 10 degrees BTDC.
DISTRIBUTOR - Electronic ignition
Created: September 15, 2000
Since the A-Series has such an efficient combustion chamber design, the standard points set-up is perfectly capable of providing sufficient sparks for effective combustion when new. And this is the problem. They require regular servicing to maintain maximum performance. This can be a chore, so is generally neglected.
Changing from Dynamo to Alternator
Created: September 01, 2000
Completing this change successfully, easily and neatly is pretty straight forward 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. However, it is useful to retain the box itself and it’s connectors.
Alternator Conversion Instructions
Created: January 30, 2000
The polarity of the alternator can not be changed, so if the alternator you have does not conform to your car, you must change your car. If you bought your alternator from Mini Mania, it IS NEGATIVE GROUND.
Electrical polarity
Created: January 29, 2000
When fitting a new or rebuilt generator to your Mini, certain instructions will usually be found with it. These instructions advise the course of action to polarize the unit and are the same instructions for changing the cars electrical system from positive to negative earth or vice-versa.
Engine Shop
The Mini Mania Engine Shop
Created: January 20, 2015
Now Open! Mini Mania Engine Shop. Trust the experts.
Mini Mania's Repair Shop
Created: June 16, 2010
The Mini Mania rebuilding service will tackle almost any problem you are having! Engines, Cylinder Heads, Transmission and more!
Classic Mini Cooper Engine for Sale
Created: August 01, 2003
Have The Engine of Your Dreams. Call our Classic Mini Engine Experts for a free estimate on building your a Mini Engine / Powerunit you'll love!
Fuel Systems
Using Weber Carbs on Spridgets
Created: April 21, 2014
Using Weber Carbs on Spridgets
Created: February 18, 2000
Summer is with us once more and the Mini overheating is on everybody's mind, while the temperature gauge won't keep your engine cool at least it will let you know what is happening. To check that it is working correctly With a capillary type gauge (mechanical) Remove the sender unit from the head .Fill a small pot with water and bring to a rapid boil using
Gearboxes
Vintage Racing with a “Ribcase” transmission
Created: April 19, 2018
The world of Vintage racers seem to be ever expanding and so does the use of the venerable Ribcase transmission. A set of Close Ratio Straight cut gears can make a big difference in performance and driving pleasure.
Synchromesh Transmissions vs Dog engagement
Created: April 25, 2014
Dog engagement is typically limited to racing applications where fast, precise shifting is needed. Dog gear engagement works by having numerous large teeth or ‘dogs’ that mate into matching openings machined into the opposite surface of the drive gear. Unlike the synchro engagement, there is no synchronizing mechanism to assist in equalizing speed.
Common Ribcase transmission problems
Created: April 24, 2014
The "Ribcase" acronym for the gearbox as found as stock in most later '60's and '70's. The original design parameters were conceived around a small displacement low torque and horsepower engine and the "Smooth-case" transmission. The demands on this gearbox were well within design limits. Over the years the engines got bigger and bigger as did the weight of the cars they were installed in.
Created: October 30, 2000
Elsewhere we've considered what alternative standard production ratios are available - but that still leaves you with the power-consuming and limited-ratio alternatives helical tooth type gears. Not desirable in a competition orientated car. The solution to this comes in the form of several types of straight-cut gear sets
Austin Mini Cooper Limited Slip Diffs, What they're about.
Created: October 16, 2000
Modified engines producing more power generally induce owners to drive with greater verve, particularly when competing in one of the many motorsport disciplines. In fact this isn’t isolated to modified Minis. Owners of relatively standard machinery competing in a discipline or merely out on a country lane blast are subject to the same determination.
Austin Mini Cooper Limited Slip Diffs; parts for installation.
Created: October 16, 2000
Fitting an LSD isn't as simple as replacing the diff cage unit. In all cases a certain degree of diff housing modifications is needed - material needing to be ground/filed away to provide clearance for larger diff housing cases and crown wheel bolts. Although it has to be said the Quaife diff is supposed to fit without these mods. I've never found that.
Created: January 30, 2000
Mini Mania is the sole US representative of the excellent "Tran-X Limited Slip" differential. Basically a clutch type diff, it is a 1950's ideal incorporating a 1990's technology. It is much more refined than the previous plate type diffs.
Limited Slip Differentials, C-BTA1226
Created: January 30, 2000
When most folk talk about limited slip differentials for cars with a BMC rear end, the minds immediately turn to the "Salisbury". Indeed many think that word covers any LSD for a BMC. This of course is not so. The Salisbury diff was designed in the 50's at a time when race cars were not sophisticated, tires were usually crossply with limited grip due to port compounds, and tracks were more than a little bumpy. Agriculturally built cars needed diffs built along similar lines. High static loads were more than common to help compensate for shortfalls in chassis and tire design -
Spin on oil filter head conversion for all A-Series blocks
Created: May 09, 2018
Update your older A-Series engine oiling system!
Created: May 07, 2018
If, in order to carry out remedial work, you only jack up the back end of your Morris Minor and subsequently notice a puddle of oil on the floor under the engine, DON'T PANIC! The front cover of the gearbox is not oil tight around a stationary input shaft.
Detailing The Engine & Under The Hood
Created: January 25, 2011
Did you know a detailed engine increases the resale value of your car?  It's a well-known fact that people who take the time and effort to detail their engines also take better care of their cars.
Classic Austin Mini LUBRICATION - Oil pumps
Created: January 24, 2001
Essential to the well being of every engine is its oil pump and oil. Much in the same way as the heart and blood is deemed relatively important to us humans! It’s also another of those greatly misunderstood and, unfortunately, misrepresented subjects connected to engines.
Created: January 19, 2001
This is another of those subjects that crops up on the message board frequently. I am constantly surprised by the number of engine builders - or people who charge other folk for building engines at any rate - that never hand out such an information sheet. It seems pretty daft to me that having taken a wad of money off of a customer for an engine you've lovingly put together, you'd want to help that person get the very best out of the engine.
Centre Main Cap Strap Fitting Instructions, CMS10
Created: December 05, 2000
This strap is used to give support and strengthen the centre main bearing cap on small-bore engines (850/998/1098cc). It helps counter the problems caused at higher rpm where crankshaft flex (‘whip’) causes the standard cap to move (‘shuffle’) leading to bearing failure and possible breakage of the main bearing caps. In particular, where higher rpm than standard will be the norm – i.e. in excess of 6,000rpm. Especially where this is for extended periods.
Centre Main Cap Strap Fitting Instructions, CMS13
Created: December 05, 2000
This strap is used to give support and strengthen the centre main bearing cap on large-bore engines (1275cc-plus). It helps counter the problems caused at higher rpm where crankshaft flex (‘whip’) causes the standard cap to move (‘shuffle’) leading to bearing failure and poss...
1275cc A Series Engine Color Schemes, Sprites & Midgets
Created: June 19, 2000
Only engines bearing a 12CC engine no. prefix were painted in British Motor Corporation Engine Green (the color somewhere between sage green and olive green applied to the power units in most BMC motor vehicles, including all the Sprite and Midget variants prior to 1967). This equates to roughly the first year of 1275 production.
Crankshaft Oil Seal Adapter
Created: January 30, 2000
Remove the flywheel, back plate, sump and the half-round cover, secured to the block by 3 bolts, above the main bearing cap (MBC). Carefully clean up the rear block face area adjacent to the MBC (Fig. 1 A); removing all traces of gasket, burrs, etc.; also the outer, horizontal edge of the flywheel mounting flange on the crank. This is where the new oil seal will seat; it will need to be checked for damage and carefully polished smooth with wire wool or fine emery.
FAQ on the Pertronix Ignition Application
Created: February 01, 2006
Frequently Asked Questions about the use of the Pertronix Ignitor systems. The best information available from the experts at Minimania.com
123 Ignition Mounting Instructions
Created: January 31, 2006
Mounting instructions for the '123ignition' type : 123\MINI-R-V & 123\MINI-R-V-A+ for : all 6 & 12 Volt cars, negative earth only ! IMPORTANT Please read the entire instructions before you begin installation. If after reading you are unsure of the procedure to be followed, please ask som...
IGNITION - Establishing a TDC reference point
Created: September 26, 2000
Establishing an accurate TDC reference point is of paramount importance when developing and monitoring ignition timing (and cam timing come to that). When an experienced engine builder assembles an engine - no matter whether for road or race - he will establish an accurate TDC indicator that can be used for ignition purposes.
DISTRIBUTOR- Initial ignition timing set-up
Created: September 25, 2000
Any deviation away from the original standard engine specification, or where a dizzy from another source is used in the engine you have, the ignition timing will generally be different from that set by the manufacturer.
Created: September 15, 2000
Any dizzy can be set to get maximum power. No problem. Unfortunately that's only one spot on the whole power curve/rpm range. If the curve isn't right elsewhere, the engine will be either loosing power - in some instances by substantial amounts - or detonating its self into oblivion and a costly re-build.
LUBRICATION - Oil, what it does and how
Created: February 03, 2011
It’s criminal. Folk spend fortunes putting together super-sonic motors, only to skimp on the oil they use. Why? Oil’s oil right? Wrong. Even if it’s a standard engine, it deserves TLC considering it's extremely hostile working environment.
LUBRICATION - Temperature critical
Created: February 03, 2011
The correct running temperature of the oil is perhaps even more important than the water/coolant temperatures - so let us consider how to control them. Mainly because it seems to be the most misunderstood of the whole process, and oil cooler fitment almost a reflex when over-heating occurs where a tuned engine of any type is concerned. And in many cases on standard production road cars for that matter.
Created: January 08, 2007
About a year ago I read about the reduction of zinc dialkyl dithiophosphate (ZDDP) in the oils supplied with API approval that could affect sliding and high pressure (EP) friction in our cars. The reduction of these chemicals in supplied oils was based on the fact that phosphates reduce the effectiveness and eventually damage catalytic converters and introduce minute amounts of pollutants into our atmosphere.
Created: May 24, 2001
Installation instructions for a OIL SEAL CRANK for a 1275 engine(part #RIC777).
Sureflow oil pump C-AEG413
Created: January 30, 2000
Being the heart of the engine, it is obviously essential that the pump is in prime condition when fitted. Due to robotised manufacture of the commercially produced pumps, tolerances have been opened up to facilitate rapid production and assembly.
Small bore piston applications
Created: December 20, 2013
Small piston applications and availability have been changing over time
Pistons Cranks Rod
Created: April 07, 2000
When Omega quit making A-Series pistons, Mini Spares took it upon themselves to design and build a better Piston. Recruiting the AE Hepolite Group for their unquestionable and renowned design and manufacturing expertise, the goal was to produce the most robust piston possible given reasonable cost and weight limits. Applying current technological advances incorporating their very latest hi-spec AE109TF lightweight alloy and special double heat treatments, the result is an extremely durable piston that will withstand greater cylinder pressures at higher RPM than any other currently available.
Piston Fact File
Created: January 30, 2000
Over the years, there have probably been a dozen "stock" 1275 pistons. Currently, three different designs are available from AE/Hepolite as "stock" replacements. All have an 8.4cc dished top, but compression ratios are carried by changing pin height (Pin height is the distance from the top of the piston to the center of the wrist pin- see dimension "A" shown here).
SU Carburetor Identification - Mini, Sprite, Midget, Morris Minor
Created: May 25, 2018
In this video, Ed D'Arata, Mini Mania's SU Carburetor genius, goes through the differences between the various SU Carbs found on classic Minis, Sprite & Midgets, and Morris Minors. Use this handy guide to identify what carburetor is on your classic.
Removing Slack In A-Series Engine Timing Chains
Created: March 01, 2018
Watch Our Video - If you've got too much slack in your A-Series engine timing chain, Mini Mania now has Rollmaster timing gear sets in stock to take up that slack! These oversized gear sets come in three offset options.
Timing Chain Replacement for A-Series engines
Created: February 28, 2018
Building an engine is very much like most things in life- the more attention to detail you give an effort the more likely you will get the results you were looking for. Whether you are installing a new stock or performance camshaft or even simply rebuilding your motor with the stock camshaft getting the valve timing correct is one of the more important things that you can do.
Listen to our Austin Mini Supercharged Engine Scream
Created: August 08, 2016
VIDEO: Listen to our Austin Mini Supercharged Engine Scream