Straydog954 Posted June 9 Share Posted June 9 I found a torque chart that shows an em6-300 having the same torque output of an em7-300 which is 1425 ft. Lbs. I then found a Mack brochure on the em6-300 “econodyne” which shows it to only have 1125 ft. Lbs. My question is what needs to be done to the econodyne model to get it to the 1425 torque? It does not have Robert Bosch pump, looks like Ambac. Does the pump just need to be reworked or what? Quote Link to comment https://www.bigmacktrucks.com/topic/74249-em6-300-econodyne-q/ Share on other sites More sharing options...
fjh Posted June 9 Share Posted June 9 Governor and turbo are the main factors I believe! the torque curve is huge on a maxidyne to enable the use of a trans with less gearing ! econodyne will fall on its face below 1500 the maxydyne will hold on to 1100 rpm and lower! Quote Link to comment https://www.bigmacktrucks.com/topic/74249-em6-300-econodyne-q/#findComment-553353 Share on other sites More sharing options...
JoeH Posted June 9 Share Posted June 9 4 Years ago someone said you're right.... 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74249-em6-300-econodyne-q/#findComment-553356 Share on other sites More sharing options...
fjh Posted June 9 Share Posted June 9 Guess its a fact then! 🤣🙄 Quote Link to comment https://www.bigmacktrucks.com/topic/74249-em6-300-econodyne-q/#findComment-553357 Share on other sites More sharing options...
JoeH Posted June 9 Share Posted June 9 Maxidynes make 90%+ peak torque from roughly 1000-1200 RPMs up to the governor. I'd expect the fuel pump to be the biggest factor. For 5.9L 12v Cummins engines there's a fuel plate in the pump you can slide or replace to make substantial changes to the fueling. I've never tampered with fuel pumps other than to adjust idle and gov speeds, so this one is above my pay grade. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74249-em6-300-econodyne-q/#findComment-553358 Share on other sites More sharing options...
Straydog954 Posted June 9 Author Share Posted June 9 So they made a regular em6-300 with the 1425 torque and later an em6-300 “econodyne” model must be. The econodyne em6 has 300 ft. Lbs less torque output. My question is how do you get the 1425 torque out of the “econodyne” em6-300? Quote Link to comment https://www.bigmacktrucks.com/topic/74249-em6-300-econodyne-q/#findComment-553359 Share on other sites More sharing options...
JoeH Posted June 9 Share Posted June 9 You'll want to make sure your oil pressure is high at low engine speeds to handle the extra load on the crank bearings. Quote Link to comment https://www.bigmacktrucks.com/topic/74249-em6-300-econodyne-q/#findComment-553360 Share on other sites More sharing options...
JoeH Posted June 9 Share Posted June 9 https://www.thedieselstop.com/threads/any-mack-experts-i-need-help-advise.80033/ Reading this ATM. Quote Link to comment https://www.bigmacktrucks.com/topic/74249-em6-300-econodyne-q/#findComment-553361 Share on other sites More sharing options...
fjh Posted June 9 Share Posted June 9 3 minutes ago, JoeH said: Maxidynes make 90%+ peak torque from roughly 1000-1200 RPMs up to the governor. I'd expect the fuel pump to be the biggest factor. For 5.9L 12v Cummins engines there's a fuel plate in the pump you can slide or replace to make substantial changes to the fueling. I've never tampered with fuel pumps other than to adjust idle and gov speeds, so this one is above my pay grade. this one is above my pay grade. ! That said the Ambac pump was the most common Maxidyne pump rare to see a robby spec to maxi! Quote Link to comment https://www.bigmacktrucks.com/topic/74249-em6-300-econodyne-q/#findComment-553362 Share on other sites More sharing options...
Straydog954 Posted June 9 Author Share Posted June 9 Ok. I’ve never heard of a maxidyne / econodyne engine until I saw the brochure. I thought it was either one or the other. Still learning about these engines. Quote Link to comment https://www.bigmacktrucks.com/topic/74249-em6-300-econodyne-q/#findComment-553363 Share on other sites More sharing options...
Straydog954 Posted June 9 Author Share Posted June 9 Quote Link to comment https://www.bigmacktrucks.com/topic/74249-em6-300-econodyne-q/#findComment-553364 Share on other sites More sharing options...
fjh Posted June 9 Share Posted June 9 👍 Quote Link to comment https://www.bigmacktrucks.com/topic/74249-em6-300-econodyne-q/#findComment-553380 Share on other sites More sharing options...
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