'80 450SL, How do I get more power?
Consider K&N air filter, Bosch Platinum Super-4 spark plugs, replace viscofan which takes 8% of engine power with a Kenlowe 16' (you would need to modify thermostat to prevent overheating in city traffic), set timing to 5º BTDC, replace standard coil Bosch No. 0 221 122 01 (blue label) and the switching unit TSZ-4 (which requires ballast series resistors) with coil Bosch No. 0 221 118 329, DB part No. 000 158 45 03 (green label) and switching unit TSZ-8 for high performance and high ignition capacity. (The coils are not interchangeable without the switching units).
Install Direct-Hit capacitors (see
Plug in some real horsepower with DirectHits ). These simple mods would make the engine more responsive and possibly add 20BHP to the old lump.
My new page has just about everything you need for your Raodster but let me know if you have other links that should be on it... Keith
http://northernresource.com/mercedes/107 Mercedes Benz 107 SL SLC Roadster Information Home Page