Mack meaning

[Mack_man]

Does anybody know what  Econodyne Means 

[67RModel]

I don't have any facts to verify but what I've gathered over the years is up to the point when econodyne was "introduced" Mack engines were 2100 rpm high torque rise engines that used 5 and 6 speed transmissions. Rated HP was at 2100 rpm. The econodyne engines turn slower and have their rated HP at 1800 or 1750 RPMs to save fuel and less engine noise / driver fatigue. My guess is the there are slight differences in the fuel system and engine internals (cam / pistons) between a 2100  RPM Maxidyne and an 1800 RPM Econodyne. Again no facts. Just anecdotal info...

[Mack_man]

Thanks 

[mowerman]

Good question and good answer I used to see tons of them when I lived in LA in the 80s bob

[Mack_man]

Cool cause i saw them and had no clue what it meant

[james j neiweem]

Dyne is a unit of force. Mack used this play on force in various ways over the years.

Magnadyne ( Magneto as in spark to create a  force of their gas engines)

Thermodyne (heat as in utilization of heat to produce a force in their diesel engines)

Maxidyne ( as in maximizing the force of a dyne in their high torque rise  engines)

Econodyne (as in economically using force in their later diesel engines

MP (Mack Power) is a total Volvo concept applied to Volvo/Mack engines

I am guessing this is the logic behind the use of dyne in this manner.

Just my take on this.

[terry]

7 hours ago, 67RModel said:

I don't have any facts to verify but what I've gathered over the years is up to the point when econodyne was "introduced" Mack engines were 2100 rpm high torque rise engines that used 5 and 6 speed transmissions. Rated HP was at 2100 rpm. The econodyne engines turn slower and have their rated HP at 1800 or 1750 RPMs to save fuel and less engine noise / driver fatigue. My guess is the there are slight differences in the fuel system and engine internals (cam / pistons) between a 2100  RPM Maxidyne and an 1800 RPM Econodyne. Again no facts. Just anecdotal info...

The maxidyne engine was used with the five and six speed transmission's, the econodyne used the more multispeed , nine, ten, twelve speed mack and fuller transmissions.    terry

[Joseph Cummings]

10 hours ago, Mack_man said:

Does anybody know what  Econodyne Means 

It means you have to set the "high idle" (Max Speed) to 2400RPM, Move the stop plate in the governor forward about 6 flats, and put a bunch of shims under the puff limiter. That is, if you want it to run good

[Mark T]

4 minutes ago, Joseph Cummings said:

It means you have to set the "high idle" (Max Speed) to 2400RPM, Move the stop plate in the governor forward about 6 flats, and put a bunch of shims under the puff limiter. That is, if you want it to run good

I could never figure where the "econo" part came in. 

[Joseph Cummings]

2 minutes ago, Mark T said:

I could never figure where the "econo" part came in. 

Seemed like they got about 6 miles to the gallon, just like all our Maxidynes. All that crap, Econodyne, Maximiser Two Speed Governor, 3.87 axle ratios seemed like it made so little difference in fuel consumption. I think the guys that bought those new were the ones with slim profit margins that ran lots of miles. Maybe if you had 100 trucks running on the highway all the savings would add up. Personally my favorite kind of trucking burns no fuel at all, because I'm getting paid by the hour and sitting still.

[Mark T]

I don't feel right less I'm huff'n down around 70 gallons a day.  Any Mack I ever owned , the mileage was directily related to the right foot.  The E7 350s were about the best on fuel . They were all able to clear 6 if not pushed real hard though.

[Joseph Cummings]

1 hour ago, Mark T said:

I don't feel right less I'm huff'n down around 70 gallons a day.  Any Mack I ever owned , the mileage was directily related to the right foot.  The E7 350s were about the best on fuel . They were all able to clear 6 if not pushed real hard though.

How do these late model DEF engines do fuel mileage wise in dump truck service?

[Mark T]

My '21 Peterbilt gets @ 7 miles to a gallon. It's an MX13 510 🤭 . Loaded around 70% of the time close to 70K. If you try making it go 70 all day, it drops closer to 6 MPG.  I do a lot of highway, not any sitting.  Only one I can tell from experience. Now the '13 which is really good on DEF..... about 5 and a half, but it's geared lower than the '21 too. Like I said earlier, the macks used to be around 6 if you didn't push them hard. ( pre emissions I'm referring to )

[Mack_man]

Thanks 

[mrsmackpaul]

Econodyne was after the tip turbine was stopped 

Higher boost meant a better fuel air ratio was obtained over a bigger rev range

I would also think that because your not waiting for the turbine to cool the air a much better air fuel ratio is obtained quicker

 

Paul