strungalong...go to their awesome website at www.westport.com and check out their 'technology' section(lots of info on different types of engines they do). If that doesn't answer your question, and you dont feel like calling Darren, then go to the 'contact us' section and email your question directly to Darren at Investors Relations...

I would do this, but I was raised in the city(now live in the sticks and would never go back to the city!) and don't have a clue how engines work. When something was broke we took it to the garage. Looking forward to you sharing the info you find out...

please & thanks, Shakey