kahall82 Posted April 8, 2011 Share Posted April 8, 2011 Hi all,I have an engine coming with the number E63501S2696. What can you tell me about this engine?Is it a thermodyne? Comes from a 1983 Mack.What is the difference between the Thermodyne, Maxidyne and Econodyne? Are the the same block with different head??And the differences between 237 to 350hp are because of the pump, intercooler, turbo? Quote Link to comment https://www.bigmacktrucks.com/topic/18661-mack-r-model-engine-differences/ Share on other sites More sharing options...
Lmackattack Posted April 9, 2011 Share Posted April 9, 2011 Look behind the water pump for a stamp.....END(T) 675,676 etc... if its not there or on a tag mounted to the passenger side of the block.... your numbers you give looks like you have a E6 350hp engine.Mack changed engine notation a few times in the early 80s. the diffrence in the the thermodynes,Maxidynes,and Econodynes were turbo,injection,timing,fuel pump settings etc.... each engine had its specific torque rise and thus were suited better for certain RPM range. The thermodynes were common in B models and needed lots of gears and lots of revs to keep moving, the maxidynes came out next and changed the whole game. they were High torqe rise and only needed 5 gears to pull a load. a nice concept coming from twin sticks and low power engines. the econodynes were more intended for OTR use, they had less torque than a maxidyne but had higher HP. they were better suited for long haul. again later production years the econodynes were basicly a maxidyne but set up so save fuel and had lower Max RPM settings.thats the basics of them Quote Link to comment https://www.bigmacktrucks.com/topic/18661-mack-r-model-engine-differences/#findComment-75763 Share on other sites More sharing options...
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