Mechanical Versus Electronic Engines . . .

[stev]

so, my 1988 R688T has a mechanical E6 engine in it.

when did electronic controls start to appear on Mack engines? what years or engine models signify the changeover?

[farmer52]

so, my 1988 R688T has a mechanical E6 engine in it.

when did electronic controls start to appear on Mack engines? what years or engine models signify the changeover?

I do not believe any E6 engines were electronic. The E7 is the first engine to go electronic. I think it was around 1990. My 1992 EM7 was electronic. I believe some E7s were mechanical. I am sure there are others on this site that know for sure (and will correct me if I am wrong).

[Superdog]

I believe 1990 was the first production year for the VMAC electronics.I had a 1991 CH with an electronic E7400.You could still get mechanical E7's until '94.

[stev]

I believe 1990 was the first production year for the VMAC electronics.I had a 1991 CH with an electronic E7400.You could still get mechanical E7's until '94.

so, is there a horsepower cutoff or something? are 400hp and above all electronic, while 350's and below are not? and anything beyond 94?

[mackcl96]

Do believe 1997 was the last year Mack made E7 mech,,,,,,,,but you will find leftovers in 1998

[rhasler]

I have a copy of an old publication stating that on August 1, 1990 Mack Trucks issued a press release announcing the introduction of the VMAC system. These were originally available in chassis manufactured in 1991. The publication also lists order codes for E7 VMAC engines from 250-400 horsepower. I can't recall seeing any of the lower horsepower models.

[rhasler]

Do believe 1997 was the last year Mack made E7 mech,,,,,,,,but you will find leftovers in 1998

The E7 mechanical engines were officially retired as of March 1, 1998

[stev]

The E7 mechanical engines were officially retired as of March 1, 1998

When we're E-6 engines retired? Here is an ad for 1998 e-6 engined rd-690's:

http://www.truckpaper.com/listingsdetail/detail.aspx?OHID=2416976

[rhasler]

When we're E-6 engines retired? Here is an ad for 1998 e-6 engined rd-690's:

http://www.truckpaper.com/listingsdetail/detail.aspx?OHID=2416976

I think that's a typo. A 1998 chassis ought to have an E-Tech engine. The E6 was probably retired sometime mid 1989, maybe a bit later.

[Mackpro]

I think that's a typo. A 1998 chassis ought to have an E-Tech engine. The E6 was probably retired sometime mid 1989, maybe a bit later.

Last I could find of the E6 was in 1990 however in 1991 it still listed EME6-250L and 350L plus the EE6-350, I think these were for export.