MK1-Performance-Conversions.co.uk
The most comprehensive resource for the early mini fan anywhere
The Brochure Archive
An archive of original brochures & what went into making them.

Each of the "Bolt on kits developed by Downton went through the same careful development process, this is described by long time Downton employee Mr Barry Hawkins.

A Downton, Bolt-on:

Always carefully overseen by Daniel Richmond.

When a new BMC model came out, say a new 'A' series, Downton would take the engine apart and if the car was going to remain as a demonstrator the crankshaft/flywheel assembly would be balanced, the engine would have the head faced to increase the compression, say 10-1 then ground and ported by George toth and the valves would have their heads machined in the machine shop.

George would also skillfully reseat the valves. The head would then go to Fred Stokes for careful calibration (with pipette and paraffin oil) then onward for assembling, at which time all Downton heads had the end top face stamped by Fred with comp ratio and reference number.

Jim Penton (foreman welder) would have the car and by trial and error carefully workout the shape for a three branch exhaust manifold then onto the rest of the exhaust system (silencers where bought in from Burgess silencers in Leicester). All the bolt-on Downton kits used BMC cast aluminium inlet manifolds. George in the head shop ground them out to match the inlet ports on the head and they had location pins fitted. For the competition engines Jim would produce an inlet manifold in tube for Robin Fearon, who would then fit linkages and say for example, twin H4 SU carbs, heat shields and aircleaners.

The distributors where usually changed for non vac types.

All this process would take a couple of weeks, sometimes the guy's would stay on into the evening until the job was done with Daniel carefully watching every move.

The car would then all be put back together and Daniel would try the car with the foreman mechanic on our test route complete with fifth wheel for speed accuracy. This was always a touchy time, Daniel had a good ear and a fine touch with engines, so nothing would ever get by unless it was absolutely correct.

Eventually all the bits would come off again and jigs made and and if necessary an aluminium inlet manifold cast (an outside company job).

The completed new kit would then be fitted and again go through a full Daniel test and again Daniel would be up and down the test route time and time again each time testing various SU needles etc. Not until he was fully satisfied did we all relax a little.

At the end of this process I would get all the parts together and do the costing and make the specification sheets up. Daniel and Bunty always trusted me with this side of the business.


The Downton Brochure



Produced in 1969 this semi glossy brochure was the most interesting brochure ever produced by Downton.  It gives a fantastic insight into the company & is a fascinating read.



Mini, Cooper & Cooper “S” Brochures
Brochures for the whole Mini range.





Mini 850 1960





Mini 850 1964





Mini 850 1966





No’s 1 & 3 Touring Conversion 1966





Mini 850 1969






Elf / Hornet 1966





Mini 850 1969 (Variant)






Mini 1000 1969)






997 Cooper 1961





No’s 4 & 5 Touring Conversion 1966





No’s 4 & 5 Touring Conversion 1969





No’s 4 & 5 Touring Conversion 1973










4 & 5 Touring Conversion 1966 (Variant)






Mini, Cooper & Cooper “S” Competition Tuning Brochures
Tuning specifically for competition.



Group 2 Conversion (early)




Group 2 Conversion 1966



Britax / Downton Cooper Handout

BMC 1100 & 1300 Range
Tuning for BMC’s most popular model.



Touring Conversions No’s 6, 7 & 8 (1966)



No22 Touring Conversion



No 32 Touring Conversion



1100 Motorway Conversion



1100 Motorway Conversion










BMC 1800 Range
Tuning options for the “Big” Transverse model.



No 14 Conversion

Pricelist



No’s 13 & 14 Details

1966


Sports Cars
Tuning options for various BMC & Non BMC Sports Cars..



Austin Healey Sprite 1960



Austin Healey Sprite 1961




Lotus 7 1960



Lotus 7 1961



AH Sprite MK 2 & 3




MGB GT



MGB GT



Sprite MK4



MG C Conversions



MG C Conversions



B series Conversions





Other BMC Models
A collection of stragglers, BMC Models that don’t fall into any of the above categories.



Morris Minor 1000




Morris Minor 1000



Austin A35




Austin A40