These engines ready to bolt in and run, which means, of course, that they are already mated with transmissions. These late model rod change transmissions are also fully rebuilt with a 3.44 final drive (upgrade kits to install these in earlier model cars are available at a small added cost) or a remote shift box can be used (extra cost). Flywheel and clutch assemblies are all in place.
CALL FOR A QUOTE -- Our engines are customized to your needs and interest. Call for a quote and let one of our Tech Experts, help you design a engine that's just right for your Mini.
The_Secret_To_Buying_A Mini Engine
&
Compare all Rebuilt Engines using our Comparison Chart
For More Information
The "Ultimate Street Performance Engine" from Mini Mania is the result of 40+ years of building and racing our own Mini Coopers. Because drivability and reliability are of utmost importance in any Mini Cooper, only components from well-established suppliers are utilized to build our Mini motors.
While the standard configuration is described here, power-unit engines can be customized to meet the particular needs for your Mini Cooper. Just ask your friendly Mini Mania Sales Technician for a custom power-unit quote.
About The "Ultimate Street Performance Engine"
Engine blocks are cleaned, magnafluxed, bored and painted. The oil passages are thoroughly cleaned, removing and re-tapping all the factory "lead" plugs, and replacing with threaded hex plugs. The cylinder head is one of our large valve cast iron heads and has hardened valve seats for use with unleaded fuels. It has ample room to modify for very large valves. The casting has the valves further appart than any stock casting, making it ideal for big-bore applications. We use squeeze cast Powermax 73.5mm pistons, which are specifically designed for this application. Elgin supplies the custom ground camshaft, which is driven by a new timing chain and gears. Elgin Cams supplies the custom ground camshaft.
We sell these engines ready to bolt in and run, which means, of course, that they are already mated with transmissions. These late model rod change transmissions are also fully rebuilt with a 3.44 final drive (upgrade kits to install these in earlier model cars are available at a small added cost) or a remote shift box can be used (extra cost). Flywheel and clutch assemblies are all in place.
Horsepower testing has been done with the following options not included with this motor:
- Carburation is not supplied but the single 1 3/4" SU HIF type carb (BDK needle) with K&N air filter on an aluminum manifold is recommended as is Long Center Branch (LCB) exhaust manifold.
- You also provide you our own electrical bits (starter, generator or alternator), cooling system, tailpipe, and Mini!
- The distributor is not included with the basic "Powerunit" but we recommend the "Aldon" Yellow or a 123.
Note: No core charge and call us if you are interested in 'trading-in' your old (1275cc) engine!
Non-refundable $1,000 deposit required at time of order!
Specifications:
- 73.5mm squeeze-cast pistons
- 10:1 Compression
- A+ Block, Crank, and Rods for best big bore reliability
- Our CAM103 set at 108º for best horsepower
- Large valve cast iron head with A+ 'sintered' rocker arms
- Latest Rod-change gearbox with A+ drop gears
- Standard ratio 4-speed with your choice of final drive gears
Mini Mania Engine Comparison Tool - 1380 cc
1380_ENGINE | 1380HP_ENGINE | 1380HP_ENG_ULT | 1380HP_ENG_5SPD | |
Cast Iron Head | ||||
Aluminum Head | ||||
3.4 Differential | ||||
3.1 Differential | ||||
3.2 Differential | ||||
4 Speed | ||||
5 Speed | ||||
LCB Header | ||||
Elec. Distributor | ||||
Carb System | ||||
Distributor Wires | ||||
Duplex Timing Kit | ||||
ARP Studs |
Interested in a 1275cc rebuilt Classic Mini engines and powerunits? We have those too.
Mini Mania - where Classic Mini Rebuilt Engines are for Sale
The "Ultimate Street Performance Engine" from Mini Mania is the result of 40+ years of building and racing our own Mini Coopers. Because drivability and reliability are of utmost importance in any Mini Cooper, only components from well-established suppliers are utilized to build our Mini motors.
While the standard configuration is described here, power-unit engines can be customized to meet the particular needs for your Mini Cooper. Just ask your friendly Mini Mania Sales Technician for a custom power-unit quote.
About The "Ultimate Street Performance Engine"
Engine blocks are cleaned, magnafluxed, bored and painted. The oil passages are thoroughly cleaned, removing and re-tapping all the factory "lead" plugs, and replacing with threaded hex plugs. The cylinder head is one of our large valve cast iron heads and has hardened valve seats for use with unleaded fuels. It has ample room to modify for very large valves. The casting has the valves further appart than any stock casting, making it ideal for big-bore applications. We use squeeze cast Powermax 73.5mm pistons, which are specifically designed for this application. Elgin supplies the custom ground camshaft, which is driven by a new timing chain and gears. Elgin Cams supplies the custom ground camshaft.
We sell these engines ready to bolt in and run, which means, of course, that they are already mated with transmissions. These late model rod change transmissions are also fully rebuilt with a 3.44 final drive (upgrade kits to install these in earlier model cars are available at a small added cost) or a remote shift box can be used (extra cost). Flywheel and clutch assemblies are all in place.
Horsepower testing has been done with the following options not included with this motor:
- Carburation is not supplied but the single 1 3/4" SU HIF type carb (BDK needle) with K&N air filter on an aluminum manifold is recommended as is Long Center Branch (LCB) exhaust manifold.
- You also provide you our own electrical bits (starter, generator or alternator), cooling system, tailpipe, and Mini!
- The distributor is not included with the basic "Powerunit" but we recommend the "Aldon" Yellow or a 123.
Note: No core charge and call us if you are interested in 'trading-in' your old (1275cc) engine!
Non-refundable $1,000 deposit required at time of order!
Specifications:
- 73.5mm squeeze-cast pistons
- 10:1 Compression
- A+ Block, Crank, and Rods for best big bore reliability
- Our CAM103 set at 108º for best horsepower
- Large valve cast iron head with A+ 'sintered' rocker arms
- Latest Rod-change gearbox with A+ drop gears
- Standard ratio 4-speed with your choice of final drive gears
Mini Mania Engine Comparison Tool - 1380 cc
1380_ENGINE | 1380HP_ENGINE | 1380HP_ENG_ULT | 1380HP_ENG_5SPD | |
Cast Iron Head | ||||
Aluminum Head | ||||
3.4 Differential | ||||
3.1 Differential | ||||
3.2 Differential | ||||
4 Speed | ||||
5 Speed | ||||
LCB Header | ||||
Elec. Distributor | ||||
Carb System | ||||
Distributor Wires | ||||
Duplex Timing Kit | ||||
ARP Studs |
Interested in a 1275cc rebuilt Classic Mini engines and powerunits? We have those too.
Mini Mania - where Classic Mini Rebuilt Engines are for Sale
Mini Mania Tech Team
The Classic Mini Parts and Accessories Experts
These gearboxes have been available for a good many years and have in fact proven to be just as reliable as original ones.
FOLLOW UP QUESTION: Ok thanks. I think mine is a remote linkage, currently, but I guess that’s easy to change if you buy a rod shift gearbox with the 1380. What RPM at 75 mph with the 5 speed box? I understand it is 3.4 FD and the 5th gear equates to around 3.0. What kind of HP do you get from a street tuned 1380? Any issues with heat with the bigger engine? Any concerns with the landing between 2-3 cylinders? My 1275 S block is bored to 1310 and appears to have several crack repairs in that spot?
ANSWER TO FOLLOW UP: Yes, upgrading to a rod change is very common! https://www.minimania.com/part/MMKT0803/Mini--Mini-Cooper-Rod-Change-Upgrade-Conversion-Kit

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