Evolution of the E7 Engine

[kevgibbs]

Can anybody give me somewhat of a detailed history of the E7 engine? I'm more concerned about how the fuel system on the engine changed over time. I'm aware that a full mechanical engine was made and that a ECM controlled engine was made. However I've recently found another model for sale that uses the mechanical fuel injection pump but utilizes what looks like a electronic stepping motor to run the throttle. We have a full mechanical E7 in our fleet and we're convinced that it is the best engine to ever roll off of Macks assembly line. I would just like some history on how the E7 changed over time and what models proved to be the most powerful and service free over time. 

[Mackch613]

And where is that governor located to change it 

[Joey Mack]

it is in the EECU, PTT is used to go in and check codes, do diagnostics/repairs, and you set the governor there as well....  

[Mackch613]

Do you think deleting the truck would also help and maybe hooking up the computer up to the ecm and changing it 

[Mackch613]

Like a ecm tuning 

[Joey Mack]

I dont support deletes, they only cause big trouble later,, and I still dont know what engine you have....  aset-c or aset-i???  not enough info,and dont know what you are trying to accomplish...

[Joey Mack]

I have to go now.. 

[Mackch613]

I don’t know exactly either what aset engine it is it has a grey engine it’s all I know, what I’m trying to accomplish is get more power it seems real sluggish when going up bridges loaded I under stand that the weight on the truck isn’t light by any means (18 tons) but surely there is something I can do to get more power out of it 

[Joey Mack]

do you have a huge turbo and the stainless steel pipe that goes over the top of the engine? that pipe has 2 probes in it.. jojo

[67RModel]

10 hours ago, Mackch613 said:

I don’t know exactly either what aset engine it is it has a grey engine it’s all I know, what I’m trying to accomplish is get more power it seems real sluggish when going up bridges loaded I under stand that the weight on the truck isn’t light by any means (18 tons) but surely there is something I can do to get more power out of it

An ASET AI engine will have a plane jane, conventional looking turbo on it. An ASET AC engine will have a big silver piece of garbage hanging off the side of the turbo. It is the variable geometry actuator. This is the easiest way to glance at and ASET engine and tell the difference. If it was factory build as a dump truck it will most likely have an AI engine but a CH613 was typically a road tractor, which mostly had AC engines. Maybe yours was originally a tractor and made into a dump? Sorry but these engines don't have "lots of power" and "seem real sluggish" even when they are working properly. Its just the nature of their size and design. No matter what you do to them they will not feel like they have lots of power. I'm not saying you don't have a problem with yours but don't expect a night and day difference in drivability after "tweaking" it.

[Mackch613]

Thanks guys, on lower gears it pulls real good but then on it seems to really calm down, none the less it’s a really good truck she does get the job done so can’t complain 

[JoeH]

There is the "Logging Dog Dead Dog Remediation" post on here for the ASET AI engines. Involves replacing camshaft with a pre ASET cam, changing exhaust manifold with pre ASET, as well as turbo and exhaust pipe. All basically to remove the Backpressure feature, allowing the engine to actually breath. If you have an ASET AC, well... That sucks, not a lot you can do there.

ASET AI is probably the only Mack engine that takes a "delete" well.

Edited March 27, 2022 by JoeH

[Joey Mack]

Hey JoeH, Thanks for that last post.  I have been asked several times if I could put the E-Tech cam in their ASET I engines and I felt I could but didnt know how.  I hope I find that old posting to read more..  thanks again ,,Jojo

[Joey Mack]

I just tried to find it here, but I suck at using the search feature here..  oh well,   jojo

[JoeH]

@Joey Mack the original thread accidentally got deleted, so they had to rebuild it from scratch.  All part numbers for cam interchangeability, proper exhaust manifolds etc are all in here.

 

 

Edited March 27, 2022 by JoeH

[Joey Mack]

Thank you JoeH,,,  I went right to it...  I read a bunch of it and will get back to reading more later...  jojo