Outbehindthebarn Posted September 27, 2013 Share Posted September 27, 2013 What exactly was the differences between the Mack motors that were coupled to 5 and 6 speed transmissions and the one's coupled to so-called multi-speed transmissions? Was it simply an injection pump/setting or were there actual internal components that were different? Quote Fun is what they fine you for!My name is Bob Buckman sir,. . . and I hate truckers. Link to comment https://www.bigmacktrucks.com/topic/32934-more-two-valve-curiosity/ Share on other sites More sharing options...
blackdog2 Posted September 27, 2013 Share Posted September 27, 2013 (edited) It was the injection different toque range hi RPM low .Turbos. Same pistons. different pump manufacture Robert Bosch and AMERICAN BOSCH which is the better of the two more power. Edited September 27, 2013 by blackdog2 Quote Ed Link to comment https://www.bigmacktrucks.com/topic/32934-more-two-valve-curiosity/#findComment-208683 Share on other sites More sharing options...
theakerstwo Posted September 27, 2013 Share Posted September 27, 2013 That's right.And different color Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/32934-more-two-valve-curiosity/#findComment-208696 Share on other sites More sharing options...
Outbehindthebarn Posted September 27, 2013 Author Share Posted September 27, 2013 It was the injection different toque range hi RPM low .Turbos. Same pistons. different pump manufacture Robert Bosch and AMERICAN BOSCH which is the better of the two more power. So, any turbocharged mack six can become a hi RPM multi speed engine with the AMERICAN BOSCH pump and the right turbo only? Quote Fun is what they fine you for!My name is Bob Buckman sir,. . . and I hate truckers. Link to comment https://www.bigmacktrucks.com/topic/32934-more-two-valve-curiosity/#findComment-208697 Share on other sites More sharing options...
blackdog2 Posted September 27, 2013 Share Posted September 27, 2013 Early 80s and up with pressed in freeze plugs are the better blocks . Quote Ed Link to comment https://www.bigmacktrucks.com/topic/32934-more-two-valve-curiosity/#findComment-208699 Share on other sites More sharing options...
boyd Posted October 4, 2013 Share Posted October 4, 2013 Mack had good engines back when we had dry liners, now that they have wet liners like most other engine manufactures they cannot keep the counterbores from leaking... Just my opinion. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/32934-more-two-valve-curiosity/#findComment-210022 Share on other sites More sharing options...
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