bbigrig

60" axle spacing is pretty much the norm for a Canadian speced Mack with camel back rears. Especially for guys that get paid by the weight. Your superdog is a 60" spread.

You be hard pressed to beat (besides E6 R series combo) the reliability, fuel mileage and comfort of a CH with an E7PLN engine. I'm starting to wish we just refurbed all of those up to 1997 trucks we had. Even if you sink so money into paint and engine rebuild, you will get it all back 10 fold.

The derate on the engines has everything to do with the emission regulations. Aussie rates will decrease slightly as emissions regs increase. Just like in North America. You need a more complete burn per cylinder for more power. Higher in cylinder Temps produce more NOX emissions. EGR reduces in Cyl Temps which curb NOX emissions. Or like more commonly today DEF/urea treats NOX after cylinder. It's all relative. All while engine manufacturers are trying to keep fuel consumption down. Older EGR engines had to up there RPM operating range to compensate for loss of power in the bottom end caused by EGR induction. Newer engines have reduced use of EGR because emissions are treated after the engine. Which in turn has brought operating ranges back into lower rpm's

Yes, that was the point I made. Euro trucks have the most ridiculous engine ratings for some of the lowest gross weight ratings in the world.

89-98 E7 PLN (VMAC 1-2) 98-02 E7 E-tech EUP (VMAC 3) 02-07 E7 ASET EUP egr AC/AI (VMAC 4) 07-08 MP7 egr no DPF (VMAC 5) 08-10 MP7 MP8 egr plus DPF 10-present MP7 MP8 EGR DPF SCR The above years of production are not build dates but emissions standards the engines were built to. Example being 2010 emissions were not in production till 2011.

I was just checking to see if you had other reasons for your power loss of a mechanical nature. Try replacing the output speed sensor on the trans. You could have active and or inactive codes for it. That will cause your speedo drop and sometimes power/speed loss.

Even the cab almost seems like it's a replacement. It's so damn clean. I don't think iv ever seen the old brake valving plumbed with only a yellow and red valve. That system from factory should have the blue valve. Unless someone fitted a cab that was off off straight truck and added a trailer supply but didn't bother plumbing in the tractor park valve. This truck seems really odd. Nice truck though.

They should all be the same from what I recall. R series cab, MH, CH/CX. Now the newer CXU I have yet to get into.

I believe the NoX sensors were updated versions from what it was delivered with for that model year as well.

Speedo sensor issue at transmission output shaft. That will cause speedo drop out and intermid. Top speed issues. Do you have any loss of prime issues or miss/vibration from engine?

Friend of mine just sold a Canadian EO Demo Titan float spec tractor. Very similar to t above unit just shorter wheelbase. Even as a Demo unit he told me th replacement cost is over $200,000. Ouch.

The 365hp ratings had the highest torque rise percentage. Torque rise is measured by percentage. Peak torque would be a LbFt rating. Keep in mind the big MP7 in 09 was the 395hp. 405 came later. Maxidyne engines are known for a good peak torque rating but high percentage of constant torque rise was it's best feature. The 365 is is good mix of economy and power. The 395/405 is just wasted HP. I have an mp7 395 but would have b fine with a 365hp. Remember the days when 350 was all we ever needed. Lol.

It could be as simple as a bad antenna. Find another and plug it in.

MP7 365 is the high torque rise engine in the MP7 family. It's a good engine for P/D. That should be a good truck for city use.

Slow coolant leaks from inside the cooler are common on AC ASET engines. It will start small and then one day turn into clouds of white. I wanted to love that engine series but couldn't. Poor mileage, cooler failures and constant sensor issues. Pressure test that cooler. Some only start to leak as they heat up.

Engineers are well aware, you take any engine (MP10 being the subject today) and turn it up for a higher torque and HP rating it's going to be strong but it will wear out faster. It's science. When engines are rated, companies consider engine mean life at the ratings they release to the customer. Engines have to use or produce more energy per cylinder to put it out at the end of the crank shaft. (energy isn't free). With tweeking things you can get lots of power out of almost an engine. 1000hp out of a 5.9 Cummins exists but how long does it last pulling heavy loads??? It's a balance of energy produced versus resistance of load etc. Every internal part must be able to handle the stress over the life of the trucks life expectancy. I'm always wondering why they punch out the Euro truck engines when they haul some of the lightest gross weights? Maybe they know they will last doing less work? Lower ratings on engines with robust internal parts usually means they will last longer and should reduce warranty claims. EGR and other emissions on engines do effect engine performance. Euro engines don't use egr.

You probably do have 44 rears. Take a picture of the camel back spring pack and the end of your axle shafts (hubs) and post it. That should help us answer everything by then.

What suspension do you have and where are you located? Certain suspensions only come with certain axle ratings. How much you can put on an axle can vary depending on your jurisdiction. As an example just because you have 46,000 rears on a truck in Canada doesn't mean you can carry up to its maximum rating. Axle spreads can also dictate maximum load per axle. Need more info.

This was just a little over 30 years ago. Visiting Dad at work Toronto Branch back shop New truck delivery and mod center.

It's fairly common to have those issues when your speed sensor at the trans output shaft fails. This possible fault could be confirmed through diagnosis on V-mac.

Does your pan seems like it's leaking on the passenger side near the oil filter housing? We had a couple that looked like a pan leak but turned out to be a pressed in plug on the oil filter housing. I hope it's pan related. Save you some $$$

That level sensor in the pan is the biggest pain in the ass. Caused so many shutdowns from either sensor failure or sensor wiring wicking. To top it off you have to drop the pan just to replace it.

I've got a 99 I'm thinking of purging... 460 etech 18 Speed Mack trans. 14F 46R on air 435 rear ratio Mack axles.

^^^^ Pretty much nailed it ^^^^

2 words usually kill the argument between I6 and V8 engines. Volumetric Efficiency. I'm only referring to Factory builds not engines blown ou of proportion with add ons and programs that cut th mean engine life in half but will kill in the 1/4 mile.