Vladislav

Mack changed the crank and other heavy loaded parts when they went to Maxidyne from ENDT673. Which was of Thermodyne family which was introduced to the market in 1938. Much higher torques produced by Maxidyne required much more strength of the engine components. I don't know when Econodyne was put on the scene, probably is was a kind of mod of Maxidyne engines but with more common fuel settings. The difference was mostly achieved by different governing in the injection pump. Thinking about the shapes of the governor inside parts it looked to me like the governor had ability to push fuel rack at low revs so the engine would pull. Ok, I'm not almost sure on the physics but if you want torque, actually - forse, for a vehicle to pull load you need fuel to be burned. There's no magic in the world. So that fuel must be delivered into the cylinders. And if you don't tread the gas pedal hard but the truck pulls well it means fuel is supplied in sufficient quantity some how. To me it seems the governor is making the trick while you hold the go pedal relatively steady. The second big point (mentioned in discussions regarding Maxidyne engines) is the turbo. Definitely if you want to burn fuel you need air. More fuel - more air. So turbo must do its job. It was said Maxidynes had different turbo than Econodynes. Possibly. As of me I'd like to know what was principally different in them and how big that difference was. Since I read someone's posts from time to time when a certain common turbo was installed onto Maxi engine and against expectations of experts of the community the truck gets driving fine. Injectors could be different (and they're different) since the combustion process goes at different revs so optimal spray pattern is different too. Which could be achieved by different crack pressure. There also could be difference in the shape of cams of the pump cam shaft. Initial plunger speed may be different in different engines and the injection stroke may be longer or shorter providing different intensity of combustion. Timing angles are items from the same basket. So when you want a certain engine to be set for a certain specific performance many aspects may be performed.

I'm afraid your count is 5-10 timey wrong. Just ask me how I know

Mack went up to 2 valve E6-350 indeed. But those were not Maxidynes. Low torque curve was sacrificed for higher HP. And a bit higher highway fuel efficiency. I have that kind of engine in a MH of 1984.

Two thumbs up!

Sorry to hear. Not only the trucks are getting older. Hope and wish the fix will work out well.

Keegan, Many thanks for the answer and for the pics! It really surprized, I'd say amazed me that some MH's took place on a production line up to the end of millenium! Who would have thunk! That white V8 with black stripe has very impressive look. And the museum truck is also remarkable having NZ configuration with double steer axles. Sure besides its #1 from the end. Unfortunately it was very difficult for me to get NZ and Aussie visa to catch a plane and come look at the trucks in your neck of the woods. And in the current reality it's about impossible. Hope the world will change to better times.

Thanks for posting the show pictures! Looks like the day was great. That V12 RS is impressive. Wonder how many were built? And it looks like a Big Horn was parked to the right of it, no?

And... I re-read the whole thread - was that MH with V8 really assembled as late as 1999?

Good luck on the progress! We all sure would like to see the final result.

Tom, did you share the story of purchase of the CH? If yes where to look at? I remember your affairs regarding that green International. But almost missed the Mack party.

Thanks for the cool pictures Tom! That very first one... Looked very much like you came to the show in the CH... And than Zina accomponied you driving that blue KW

Two groups of batteries in parallel. Each one conteins two batts in series. If they're 6V two bring twelve V. Almost as Geoff said.

Happy B-lated B-day!

Seeing the picture I was sure for no less than a couple of minutes that's a scale model!

Ok, found much better pic. It was a restored British NM which was sold to Belgium. I took the photo in 2011. Don't know where the truck is now.