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Engine
Mini Mania Crankcase Ventilation Kit, C-2A265
Created: February 03, 2011
This kit provides an internally baffled housing which enables the fuel pump port on the engine block to be used to vent the crankcase. The kit also includes fasteners and gaskets to mount the fitting but does not include a hose fitting and hose.
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.
Sprite, Midget & Morris Minor Engines
Created: October 29, 2010
Spridget Mania is ready to power your motor dreams! Choose from the base motor described below, or add any options to meet your needs.
Project Small Bore, Part 2: Cylinder Head
Created: July 24, 2006
Last time we started building a small-bore engine for maximum power. But there is no point having a good engine and putting the wrong head on it. I'm going to use the 12G202 head, as these are the best to modify for our purposes. They are a bit smaller than the 12G295 or 12G206 heads, which gives you a bit more metal to play with when grinding. As far as a standard head goes, you can't go past the 12G295 or 12G206.
Created: May 24, 2001
Installation instructions for a OIL SEAL CRANK for a 1275 engine(part #RIC777).
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.
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.
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.
Water pump toothed belt drive, C-AEA536
Created: January 30, 2000
This system has been designed and developed for use primarily for racing where a positive drive system is demanded to avoid fan belt loss problems caused by out of line pulleys and ill fitting belts.
Toothed belt drive for charging system C-AEA536A
Created: January 30, 2000
The large alternator/dynamo pulley is driven from the water pump pulley by a separate belt, thus ensuring the vehicle is still driveable should the charging system belt fail as the water pump will still function. Do not over tighten belt. Correct tension is when you can easily twist the belt through 90°.
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.
Steel four bolt main cap, C-AGA619
Created: January 30, 2000
This cap has to be line bored and thrush washer faces machined before use. It is uni-directional and must be fitted with the ‘F’ stamped in one side facing towards the front
Steel four bolt main cap set C-AGA621
Created: January 30, 2000
These caps must be line bored and thrust washer faces trued up before use. They are not suitable for ‘S’ blocks. The centre main must be fitted with the ‘F’ stamped in one side facing the front (water pump) end of the block.
Oil Pressure Regulating Kit, HPS4
Created: January 30, 2000
This kit includes a new oil galery plug with an adjustable knob and a washer which is used as a spring seat in the plug against the relief spring. This makes a playform for the adjuster bolt to adjust the engine oil pressure.
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).
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.
Created: January 30, 2000
This kit contains parts and instructions for installing a conventional-style rear main seal on the 1275cc “A”-series engine as fitted to the A-H Sprite and MG Midget and as used as an upgrade to the Morris Minor.
Engine Run-in, SPRITE/MIDGET
Created: January 29, 2000
Installing a new rebuilt engine in your car will give it a major “shot in the arm” in any number of ways. In order to get the most of this change we suggest that you take the time while the engine bay is empty to
Oil Pump information & part#
Created: January 29, 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.
Belt drive for charging systems C-AEA536
Created: January 29, 2000
This kit is an ‘add on’ for the C-AEA534 toothed belt water pump drive for the charging system. The large alternator/dynamo pulley is driven from the water pump pulley by a separate belt, thus ensuring the vehicle is still driveable should the charging system belt fail as the water pump will still function.