MED INLINE STRAIGHT CUT GEAR KIT

Name: MED INLINE STRAIGHT CUT GEAR KIT
Brand: MED Engineering
SKU: MED-3241-ISC
Price: 565.0 GBP
Availability: InStock

Part No: MED-3241-ISC

£565.00 £470.83 EXC VAT

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Availability: In Stock

Description

Our straight-cut close-ratio gear set for the inline gearbox (Sprite and Midget) is machined on the very latest CNC machinery allowing us to offer a perfect gear tooth form. 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.

Ratios are as per the original Special Tuning gearsets, making these an ideal choice for fast road and light competition transmissions.

These are designed for 1275 ribbed-case gearboxes only.

Kit contents:

Laygear cluster

Second gear

Third gear

First motion - input gear

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.

Additional Information

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.

Frequently Asked Questions

What's the performance advantage of using this gear set?

Compared to a standard Sprite/Midget gear set, this has closer ratios, so each up shift results in a lower RPM drop. In turn this helps to keep the engine within its peak powerband, improving acceleration up through the gearbox. The straight-cut design of the teeth reduces friction from side loading of the standard helical-cut gears, further improving acceleration.

Which cars does this gear set fit?

Inline A-Series-powered cars with the 1275 rib-case gearbox housing from the MG Midget. It will not suit the early smooth-case gearbox housing, or transverse A-Series engine cars like the Mini or Metro.

Can I use this in a road car?

Yes. 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 the standard gearbox, but it will be louder. It is the swap to a dog-engagement racing gearset that will affect the drivability of a road car.

Do you recommend a specific baulk ring for this gear set?

Yes, we keep a three-synchro set that is ideal for this application, part number MED-3733-BR.

Will the different ratios affect the way my car drives?

The laygear is tooth corrected in profile to run with the standard first gear, which affectively makes this taller than standard. From here through to fourth gear are then placed closer together to reduce the RPM drop as described above.