V-8 question

[felicello122]

Does any one know the torque a E-9 500makes stock fuel settings vs one that was juiced up?

[phildirt]

E9 500 performance chart.pdf

Here are the factory specs-

From Mack Publication 5-102, March 1993, E9 Mack V-8 Engine Overhaul Procedures

[felicello122]

E9 500 performance chart.pdf

Here are the factory specs-

From Mack Publication 5-102, March 1993, E9 Mack V-8 Engine Overhaul Procedures

thanks for the quick response.

[rsb502]

Mack power train guy dave mckenna told me they were underrated by about 10-15%, I know my old 440hp E9 would walk away from a CAT 550 that supposedly made 1850.

[farmer52]

Mack power train guy dave mckenna told me they were underrated by about 10-15%, I know my old 440hp E9 would walk away from a CAT 550 that supposedly made 1850.

Dave is a good guy and straight shooter. Mack Test Lab would routinely run test engines at 10% and 20% over max HP in the test cells. Their philosophy was "tear them up in the test cell, not in a customer truck". I think Mack sent many pre-electronic engines out of the factory "hot". The limiting factor is the drivetrain and how much torque it can handle.

Remembering my old "Cat house" days...Cat was conservative and the engines went "out the door" set at 0-2%. Not saying the engine could not make more power, they did not want to "give away" HP. I got "talked to" one time when I sent an early 350HP 3406DITA test engine out the door at 380. The test fleet loved it! After that I set them to 0-1% rated. Back then they used a smoke limiter. Acceleration smoke limit was 15%...I set them to 14%.

There was a lot of "competition" among engine OEMs in the 60s, 70s, and 80s. Now with the onset of emissions regs, it is all about emissions and fuel economy.