Wednesday, 19 March 2025

DKW Boffins Set Design Trends - The West Australian 3 February 2019



In 2019, my DKW was featured in an article in The West Australian newspaper by Neil Dowling. This was the second of my cars to be written up by Neil.

The importance of DKW's front wheel drive solution is also covered in this excellent video by B-Sport



Tatra article: https://tatrat600.blogspot.com/2024/10/the-car-that-stood-up-to-germany-west.html


1960 IWL Berlin 'Stadtroller' SR59 Operating Manual


The Stadtroller „SR 59-Berlin“ is a Product of VEB Industriewerke Ludwigsfelde.

This operating manual was was written by a collective of Authors of the VEB Industriewerke Ludwigsfelde.

All rights reserved – Technical books press Leipzig GDR – Type setting and print: Technical books print Naumburg (Saale) GDR. KG 12/3/60

A lot of unnecessary frustration will be avoided if you don´t put this operating manual aside carelessly, but instead briefly familiarize yourself with the directions and suggestions this manual provides. All sections of this manual have been compiled by skilled personell and serve the purpose of imparting knowledge about this vehicle to you without which the operation of a modern motorvehicle would just be impossible. We want to give you the maintenance and care advice necessary for you to be able to enjoy your vehicle, instead of having to spend your valuable free time at an authorized dealers shop, that you should better use for your own recreation.

It´s a simple fact that any new motorvehicle should be treated with a lot of care and attention. This is why you will save lots of money, frustration and potential anger if you apply the knowledge gained from this operating manual. Not only should you consider the given advice for a single ride, but for the entire time in which you drive your motorscooter.

Please consider that the observance of our advice essentially contributes to the preservation of your property and thus to the peoples property.

If you don´t find the information on the following pages sufficient or if you need additional advice, you can always contact one of our authorized dealers. They will always help and advise you, because our authorized dealers ought to avoid repairs before they happen by making qualified suggestions and giving helpful advice.

VEB Industriewerke Ludwigsfelde


Section 1: Technical Details
1.1 Engine
Two-stroke motor with reverse flushing
Hub - 58 mm
Bore - 56 mm
Cylinder arrangement - 1 cylinder set at 15 degrees forward
Displacement - 143 cc
Compression ratio - 7.75:1...8.1
Capacity - 20.4 cc
Power at 4000 rpm - 6.5 PS
Maximum power at 5100 rpm - 7.5 PS
Max torque at 3500 rpm - 1.15 kgm
Air cooling by axial pressure blower Lubrication ratio - 1:25
Carburettor
Type - 24 CN 1-1
Inlet - 24 mm
Main jet - 90
Nozzle needle - 67
Idle jet - 45
Needle position - 3
Part of Vane - 4 mm
Idle air screw - 2.5...3 turns
Float weight - 10.6 g
Air Filter - Prallblech Naßluftfilter with Intake
Ignition
Battery ignition
Spark plug - Insulator M 14-240
Thread length - 10 mm
Electrode gap - 0.6 mm
Breaker contact spacing - 0.4 mm
Vorzündung - 4 mm v. OT (28° crank angle), fixed
Pistons
Material - Si 20
Piston rings - 2 compression rings
About sizes
Cylinder Dmr. 56.25, 56.50, 56.75, 57mm
Crank shaft bearings
Number - 3 Rillenlager rings
Connecting rod bearings - Dual roller bearings, käfiglos with cutting disc
Dimension - 5x5 DIN 5402

1.2 gearbox and power transmission
Clutch
Multi-disc wet clutch in oil
Covering - Reiblamellen 'original Cosid'
Number of pressure springs - 6
Gear at motor angeblockt, claws circuit
Number of gears - 4
Idle display - Elect. Amaturenbrett in check, left
Circuit by foot gear and Schaltautomat
Gear steps
1st gear ratio - 3,05:1
2nd gear ratio - 1,805:1
3rd gear ratio - 1,285:1
4th gear ratio - 1:1
Transmission
Engine to gearbox - 2,75:1
Gear box to rear sprocket - 2,19:1
Total translation
1st Monitoring - 18,4:1
2nd Monitoring - 10,8:1
3rd Monitoring - 7,73:1
4th Monitoring - 6,02:1
Kickstarter translation 3,76:1
Power transmission
Engine / gearbox
Raise chain 3/8x7, 7x5 Dmr., 44 members
Gear / rear - 1/2x1/4x8 roller chain, 51 Dmr. 94 rolls

1.3 Brakes
Foot brake acts on rear wheel. Interior jaw brake activated by Bowden cable.
Handbrake acts on front wheel. Interior jaw brake actived by Bowden cable.
150 mm diametre hub brake drums on front and rear.
Pad width - 24 mm
Material - 'Original Cosid' glued to shoe.

1.4 Wheels
Type - Full disc wheels, light metal
Axles
Front: normal axis with dropouts
Rear: downhill
Rims
Low-bed rims 2.50 Cx12
Tyres
Dimension 3,50-12
Type - Block profile
Air-pressure - Front 1.2 atü solo, ear 1.5 atü solo F.
Atü front 1.4 m. Soz.
Atü rear 2.0 m. Soz.

1.5 Suspension
Front suspension - Schwinghebelgabel, screws pressure spring with friction dampers
Effect proportional
Deflection - 110 mm
Rear suspension - Keystone arm, torsion bar springs (patent), hydr. Hampered
Effect proportional
Deflection - 70 mm

1.6 Steering
Steering head angle 25°
After running front - 75 mm
Stop driving on the forehead tube
Steering angle 90°

More to come.....


Saturday, 15 March 2025

1934 DKW SB350 Motorcycle Restoration Video Series


This is a series of movies by Wedvik Mekaniske following the engine restoration process of a DKW SB 350 1934. The motorcycle was found in a shed, totally dismantled after being started on a restoration process decades ago. The bikes origin is around Femunden in Norway and the bike was probably barely used for transportation purposes. There was very bad infrastructure and barely no roads around Lake Femunden in the 40`s and 50`s and the bike shows evidence of being used in the forest on bad roads. Quite common for woodsmen to use motorcycels for "easy" transportation to work. The bikes life cycle is now ended and the DKW is again back to the same family where it was new. I`m doing the rebuild of the engine and the owner is doing the complete restoration of the bike. The last episode in this series of videos will be with the finished running bike. Hopefully on the nicest DKW´s there is!

Part 1: Dismantle and measuring of piston, piston rings and cylinder

Part 2 - Vapor blasting of head and piston

Part 3: cylinder honing and lacqueringPart 4: carburetor restoration

Part 4: carburetor restoration

Part 5: Nickelplating / Electroplating of bolts and nuts

Part 6: Engine teardown / disassemble

Part 7: Blackening of bolts using engine oil

Part 8: Crankshaft truing

Part 9: Gearbox restoration

Part 10: Cork Clutch rebuild

Part 11: Mounting of crankshaft and cases, measuring of crankshaft sideplay

Part 12: finishing the primary with clutch install and measuring of gear backlash

Part 13: Deburring cylinder ports and adjusting piston rings before mounting

Part 14: Installing electronic ignition and setting the timing - machining needed!

Part 15: Brass casting of new exhaust port cap

Tuesday, 11 March 2025

Monday, 3 February 2025

1929 Audi Dresden








In the second half of the 1920s, Germany had dozens of automobile companies that manufactured large, conventional cars. As surprising as it may seem to us now, the German hyper-inflation of the early 1920s actually stimulated the manufacture and sales of these vehicles, as people with money to spare were prepared to buy any tangible asset as a hedge against the rapid devaluation of the currency. By the mid-to-late 1920s, this undiscerning market had disappeared and these companies found themselves with stocks of very expensive vehicles they could not sell. August Horch's Audi company was in this very position. This is not to say that Audi's were poor vehicles. Horch's Audi prided itself on its engineering excellence, but excellence comes at a high price - a price the market was not prepared to pay when awash with rapidly depreciated large cars.

In 1928, the State Bank of Saxony approached Jorge Rasmussen, founder and principle of the JS Rasmussen Group, owner of DKW, to buy out the ailing Audi. DKW at this time was a rapidly growing motorcycle manufacturer - a highly profitable market - but was also experimenting with budget automobiles. The first DKW automobile, the P-15, went on the market earlier that very year. Rasmussen was keen to expand into fully-fledged automobile manufacturer and saw a golden opportunity to secure a prestige automaker. Shortly after taking over Audi, Rasmussen must have realized Audi was not the plum asset he had assumed. Audi production methods were archaic - especially compared to his beloved DKW, which had pioneered mass production techniques in its motorcycle division. Audi needed a comprehensive overhaul if it was to be returned to profit.

At the same time Rasmussen was negotiating the purchase of Audi, he'd been visiting the US to observe production line manufacturing and secure the plant and machinery from the recently bankrupt Rickenbacker company. Rasmussen anticipated selling Rickenbacker's six and eight cylinder engines to other car makers in Germany. Unfortunately, that plan came to nothing and Rasmussen's Rickenbacker engines found no market in Germany. Left with an unsaleable production run of engines, he decided to install them in new Audi model, the Dresden. 

Unfortunately for Rasmussen and Audi, the Dresden also failed to sell. Only a few dozen were ever built as the market for big cars had evaporated. In desperation, Rasmussen re-engined the problematic DKW 1000 model with a 4-cylinder Peugeot motor and re-badged it as the Audi P, but it too failed to sell. This was the last hurrah for Audi and the factory in Zwickau was given over to manufacturing the newly designed DKW Frontreib car. The Frontreib would become a best seller and the salvation of the company.

For more see:
The Audi P: https://dkwautounionproject.blogspot.com/2021/01/1931-audi-type-p-last-throw-of-dice.html
Rasmussen Engines: https://dkwautounionproject.blogspot.com/2020/07/1930-rasmussen-6-and-8-engines.html
1928 Audi Eight-Cylinder: https://dkwautounionproject.blogspot.com/2018/02/1928-audi-eight-cylinder.html
The Big DKW: https://dkwautounionproject.blogspot.com/2017/06/the-big-dkw-48.html