BMW Twin

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The BMW engine does not have a primary reduction from the crankshaft to gearbox as is typical in most engine configurations.  This makes overall gearing a problem, particularly for small wheel sidecar outfits, with this in mind a 6.67% increase between the engine and gearbox has been incorporated.

 

The standard gearbox ratio’s are unsuitable for serious racing and have been changed, as shown in the chart, to further enhance the racing application all gears have three undercut engagement dogs.  Supplied completely assembled requiring only shaft support bearings.

 

Available With Superfinish

 

Comparison to Standard BMW Twin Gear Ratios

 

Nova Race Gearset         Percentage Drop              BMW Standard Box             

 

1st      18 - 30        2.999:1                                           1st            4.401:1          
                                                 )   25.0%                                                              )        35.0%
2nd     24 - 30        2.250:1                                           2nd          2.860:1     
                                                 )   20.0%                                                              )        27.6%
3rd      25 - 25        1.800:1                                           3rd           2.071:1    
                                                 )   14.8%                                                              )        19.3%
4th      27 - 23        1.533:1                                           4th            1.670:1      
                                                 )     8.7%                                                               )       10.2%
5th      27 - 21        1.400:1                                           5th            1.500:1     
                                

Overall Reduction 1st – 5th    53.0%                  Overall Reduction 1st – 5th     66.0%

 

 

Price £1300 + VAT (if applicable) & Carriage

 

	Nova BMW Twin Gearset

 

BMW Twin Drive Shaft For Side Car Use

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Not part of our original brief but it soon became apparent that this is one of the area's which required a serious engineering solution.

 

Whilst cutting and sleeving may be acceptable to the owner builder, it is not an option for those wishing to sell complete outfits i.e. the Windle chassis kit.

 

We therefore undertook to design and manufacture a shaft arrangement.  The most important part being a suitable, available, Universal joint.  Once this was decided on, a drive flange and shaft were designed to allow Terry to complete his design.

 

The proximity of the driver to the drive shaft requires that only the best available material and heat treatment are used, in this case it is the same as F1 car drive shafts with full certification.  The length is 493mm measure from the gearbox output flange to the start of the taper into the rear wheel drive unit.

 

Price Including Universal Joint £550 + VAT (if applicable) & Carriage

 

	Nova BMW Sidecar Drive Shaft

 

BMW Twin Vernier Cam Timing Sprocket

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Direct replacement for the standard item.  Allows precise cam timing to be achieved.

 

Price £225 + VAT (if applicable) & Carriage

 

	Nova BMW Vernier Timing Sprocket