Originally Posted by rick oxley
hi rody could you tell us a bit more about your onroad engine and how it differs
from the O.S. r2102 maybe opening a thread in the onroad section would be a good idea.
First Thank you 1/8 IC Fan for starting this thread.
The OS based engines I am making are very close to the original OS engines itself in production because the quality and finish of their engines are very close to perfection.
The main difference between the OS R2102 and the VSR02 is that I have modified sligthly the crankshaft timing and made some extra modifications to the crankshaft itself.
Then I am using my own design combustion chamber(underhead or also insert) which for me brings even more torque to the engine at the low rpm area.
I also prefer to use the steel main-bearing over the ceramic bearing because I have never found more performance over the extra costs.
I have had also very good results using the VSR02 engines with the EFRA 2115 tuned pipes made by Hipex. These pipes give the same performances as the OS2080-SC pipes just less noise. IMO the OS pipes seem more performing but they also make more noise and this has some influence on the racer it seems, but for me the performances are the same.