Walt1967 Posted March 19, 2015 Share Posted March 19, 2015 Looking at a 1990 mack superliner.truck has 400 mack motor recently overhauled, 13 speed, 44 rears.question is will this motor stand up to hauling heavy,160000 gross.it is a michigan special. Thanks for replies. Quote Link to comment https://www.bigmacktrucks.com/topic/39325-400-mack-engine/ Share on other sites More sharing options...
dds92780 Posted March 19, 2015 Share Posted March 19, 2015 It should handle that but you might want a bigger turbo and injectors. The bottom end is pretty damn strong on these things though. Being that its a 90 im guessing its the e7400 mechanical which is the best engine mack made and most sought after from what i know, plus it has the best mechanical pump you can get. ( is the pump number 0 402 746 852? ) So to answer your question, if you get a bigger turbo and injectors and play with that pump, it should be able to handle 550 plus and get you hauling the heavy loads you are looking at. If you don't want it i'll buy it for a spare 2 Quote Slow and Steady Wins the Race! Link to comment https://www.bigmacktrucks.com/topic/39325-400-mack-engine/#findComment-283227 Share on other sites More sharing options...
Gmerrill0516 Posted March 20, 2015 Share Posted March 20, 2015 I know that more gears are better in these cases. I have no idea how the 13 speed ranks but am curious to know.Sounds like fun.Greg Quote Link to comment https://www.bigmacktrucks.com/topic/39325-400-mack-engine/#findComment-283231 Share on other sites More sharing options...
theakerstwo Posted March 20, 2015 Share Posted March 20, 2015 550 plus??? Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/39325-400-mack-engine/#findComment-283246 Share on other sites More sharing options...
dds92780 Posted March 20, 2015 Share Posted March 20, 2015 More like 500. There was a guy that had a 460 on here that upgraded stuff and got to 550 hp his water temps and pyro were just getting too hot. it can be done though. Quote Slow and Steady Wins the Race! Link to comment https://www.bigmacktrucks.com/topic/39325-400-mack-engine/#findComment-283248 Share on other sites More sharing options...
bts-4120 Posted March 20, 2015 Share Posted March 20, 2015 more than likely set up with 4.42 or 4.64 s ? should be a pulling machine but not a speed demon up big hills with that much gross Quote Link to comment https://www.bigmacktrucks.com/topic/39325-400-mack-engine/#findComment-283256 Share on other sites More sharing options...
dds92780 Posted March 20, 2015 Share Posted March 20, 2015 Mine is a 4.42 and i can get up to 67mph Quote Slow and Steady Wins the Race! Link to comment https://www.bigmacktrucks.com/topic/39325-400-mack-engine/#findComment-283258 Share on other sites More sharing options...
oldsuperdog Posted April 19, 2015 Share Posted April 19, 2015 What kind of 13 speed? Eaton or Mack? I know with the Mack 13 you can cut the tab in the shifter knob that prevents you from slitting the low range and make it so you can split the bottom gears giving you an "18 speed". 1 Quote Link to comment https://www.bigmacktrucks.com/topic/39325-400-mack-engine/#findComment-287216 Share on other sites More sharing options...
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