Hello everybody! I'm doing a report on a B13 engine for school. And i'm stuck. Maybe someone can help me? It's about the sparkplugs. The trailing one has a hole of 4 mm were the leading one has a hole of 13 mm. Anyone who can tell me exactly why this is? I know it has something to do with the rotorpoint passing it. Excuse me for my bad english, it's not my mothertongue. the report is due too tomorrow so some help is wanted fast. Thanks in advance!
Dries

 

I think you misread something or got things mixed up...where are you getting this info? mine are the same externaly. I could not get my head in there to see the internal dimension.

 

No i meen the internal dimension. The rotor passes the trailing spark plug first, then the leading one who ignites, then the trailing one ignites i believe 15 degrees after and late in the powerstroke the leading one ignites again. But why is the passage too the combustion chamber of the trailing spark plug smaller? I think it's too prevent leakage between two chambers. But i can't exactly specify why.