Hallo
At first, I am sorry for writing in English, but I am hopeless in German. Some of you might recognise my text because I have been asking the following in the other German Tradi forums as well.
I have an extra P50 motor, which I am planing to use in a late 50s style classic TT racebike frame. I have been looking for knowledge to tune the engine for road racing. However, the knowledge for this engine is naturally all or mostly in German language. I am lookin for tuning tips to original engine. I want to keep it 500cc ad use original parts. This means I am not looking for modern aftermarket parts. P50 was used in rally right when it was introduced and my engine is actually possibly from the rally car, because it has filed pistons in it. Basically I am not looking for extreme power and limits for the engine, just some extra power for fun.
I have found a couple of German pdf files, that have some information about making third by-pass port and cylinder port diameters. I need to start translating those. While doing this I have a couple of detail questions already.
How do you think the engine would work without external flywheel in a motorcycle frame? This is what my plans are now. Light frame does not need that much momentum than a car body.
As I need to buy a set of bearings for the engine, what kind of main and conrod bearings would you recommend?
Engine obviously needs a new carburetor. Any good (preferably period, 1950s to 1970s) carburetor options in mind?
I could use two-stroke tuning handbooks also, but for that I need to know what is the best rev. range for Trabant engine from your experience? How high it is save to go and how wide is the torque range?
All good tips for power and reliability in tuning this wonderful disc valve unit are more than welcome. I would rather not "learn from mistakes" with this a bit rare engine.
Regards Risto Nurmi (Oulu, Finland)