Just what does "ISB" stand for? I know it may seem silly to those that know the answer but help a fellow Cummins owner out.

 

Interact System B,The ISB is a 24 valve engine (4 per cyl), the earlier engines were 12 valve.

Found in the tech facts section at the top of the page.

 

I should have said new CTD owner. I actually was in school to be a diesel mechanic before I joined the USAF over 22 years ago. I hope to return to diesel school when I retire. I see so many acronyms at work, USAF, and on these CTD sites that I was not sure what it stood for. Thanks for the info.

 

Check the tech facts like Amartison said and don't worry about it. No body knows everything thats why we all come here for help. No one will make you feel stupid.