Better engine braking?

I wouldn't doubt you on any of it actually lol

 

Don't believe everything you're told by big corporations! How many times were ye told that pacaar engines were great, tried and tested in Europe for years? Except they never told you what pacaar customers like me thought of them! And before this erupts into a p*ing contest I invite pacaar to tell me I'm wrong, sue me for slander! Thing is they can't! All it would take is someone from pacaar to come on here and shut me up! I'm still waiting for my money!

 

I drive a '12 Prostar daycab with an end dump occasionally, and it's got the Maxxforce 13. Definitely an exhaust brake (must be a choice when ordering the truck) and set at 430hp I've had to add an HOUR to a 4 hour trip due to the hills. Previous truck for this was a '09 Century with a Series 60 Detroit, also set at 430. VAST difference in power and jake.

 

The Navistar engine isn't all bad... mine can't pull a empty trailer over a hill without putting up a fight, but anymore than 30k in the box it passes other trucks.

 

A jake brake is internal and an exhaust brake is located in the exhaust line usually very close to the turbo. Jakes are not available on all engines.

 

I really think Navistar made that engine for heavy hauling.

 

There are basically two models of each Maxxforce 11 an 13 engines. The 2007 and the 2010. The 2007 model Maxxforce 11&13 do not have "engine" brakes, but only an "exhaust" brake. The exhaust brake is very very weak and kinda a joke. The 2010 Maxxforce does indeed have a genuine Jacobs Brake Engine compression brake. The engine brakes are standard equipment on Prostars only and optional on Workstars and Transtars. The 2010 model still has the exhaust brake valve after the turbo. This valve is primarily used to create back pressure and extra load and exhaust heat to aid in a parked regen. I can't find anywhere to say that it is still used to aid in engine braking though. The normal service interval for a valve lash setting is 250,000 miles, but if you are feeling weak brakes anything out of adjustment this early would mean a defect and should be checked out. It should be checked to that the engine is seeing the request from the body controller to command 100% brake level. Even though the switch is at stage 3, it may be only registering stage 2 or 1. These engine brake work the best at the upper rpm band. The engine will command high turbo boost to aid in the braking, you should be seeing at least 20 psi of boost at stage 3 braking at 2000 rpm or so. Also the engine will detect open or shorts in the brake solenoid circuits and log a code, this should be checked also.