Reply to thread

Message: [QUOTE="me2, post: 367060, member: 3825"] I spent a bit of time digging around in Quickserve and online looking for an aluminum (marine) valve cover for the 6.7 that is straight on the inlet side. I don't think they exist. All the industrial covers seem to have sidecuts in them and some/most use 3 hold down bolts instead of 6. However, all was not lost as I found other interesting parts, such as a valve cover gasket that works with CM2150 and 2250 ECMs and sidecut valve covers. I also found out that Cummins makes a 480HP QSB 6.7. The QSB is the industrial version of the ISB. Same basic block and component list, with the gear drive at the back of the engine, so there is more room to run stuff on the front. QSB 6.7 info is here. [url]http://cmdmarine.com/engines/rec/inboards/QUANTUM/qsb/qsb-67.html[/url] These two data sheets are interesting. [url]http://cmdmarine.com/engines/rec/inboards/QUANTUM/qsb/FR93492.pdf[/url] [url]http://cmdmarine.com/engines/rec/inboards/QUANTUM/qsb/FR93731.pdf[/url] I did some parts comparisons between the QSB 6.7 480, an ISB6.7 XT 360 and an ISB 6.7 350/800 and the differences are (much) less than you might imagine. The HO QSB 6.7 has a flat power curve and makes 450+ HP from 1950ish RPM to redline. Peak torque is 1165 ftlbs at 2000 RPM. From what I can tell via the CPL, working without an ESN, it uses a single HX55 turbocharger that is normally used on a high output ISC 8.3. The HX55 will deliver about 80 pounds per minute. The Dodge Cummins ISB uses the HE351, which tops out at less than 60 pounds per minute. Suddenly the goal of getting 600HP and 1200 ftlbs from my engine doesn't seem so far fetched. I am still working on CNC stuff, when I am not taken with family commitments. [/QUOTE]