MED 3-SYNCHRO GEAR KIT

MED 3-SYNCHRO GEAR KIT

Part No: MED-3230-3S
Regular price £395.83
Regular price Sale price £395.83 £329.86 EXC VAT
Sale
Availability: In Stock
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Description

Our straight-cut close-ratio three synchromesh gear set is machined on the very latest CNC machinery allowing us to offer a perfect gear tooth form. This kit is intended for early Minis with a three-sync gearbox, with a 'crash gear' on first. As with all of our gear sets, these are made locally in the Midlands so we can keep a constant eye on quality control.


The gear kit is produced from EN36C and case hardened along with molybdenum sprayed baulk ring faces.




Kit contents:



  • Second gear

  • Third gear

  • Laygear

  • First motion shaft




Gear ratios:



  • First - 2.573:1    

  • Second - 1.722:1    

  • Third - 1.255:1    

  • Fourth - 1:1


Please see the additional information tab for more detail.

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Additional Information

Gearset choice
We offer four different gearsets for the Mini/Metro gearbox, all straight-cut close-ratio types for high performance applications. The Clubman gearset allows you to re-use first and reverse gear from the standard setup, but is only suitable for later rod-change gearboxes.

The Three-synchro gearset is intended for early Minis with three-synchro gearboxes.

Next, the MED Race gearset utilises the same ratios as the original Special Tuning conversions and comes with new a first/reverse gear. It is available for both rod and remote-change gearboxes.

We then have the MED dog-engagement gearset, which does away with the baulkrings for ultimate strength in competition applications. This can be supplied for rod or remote change gearbox housings, with an optional superfinish for even greater durability and reduced friction.


Straight-cut vs helical-cut gears
The design of helical-cut gears, as found in standard gearboxes, leads to increased side (or axial) loadings on the transmission. As power outputs increase, this places greater strain on the transmission casing and bearings, in-turn leading to reduced reliability.

Using straight-cut gears allows us to design a stronger transmission within the standard casing. It also reduces power losses to make the most of the engine's power. We estimate between 5-7bhp can be gained at the wheels by using a straight-cut gearset.


Road suitability
There is a myth that driving with a straight-cut gearbox on the road is hard work. In fact a straight-cut synchromesh gearbox is no different in operation to a regular gearbox, but it will be louder.

Most cars use a straight-cut first/reverse gear; it is the swap to a dog-engagement racing gearset that will affect the drivability of a road car. 


Close ratios
Closer ratios give a reduced engine RPM drop when changing up a gear. This keeps the engine within its optimum power band more effectively, resulting in better acceleration through the gears. Fourth gear is still the same 1:1 ratio, but first gear tends to be taller than with a standard gearset, to bring the ratios closer together.

The final drive ratio and wheel size need to be carefully considered to give the best results - contact us if you're unsure.