Kunle Posted September 19, 2010 Share Posted September 19, 2010 Hi Guys,I am not a pro when it comes to Mack. I will like to know what year did Mack start installing 4 valve / cylinder engines in the R models.Any physical attribute to know a 4 valve engine from a 2 valve engine?Also, what year did the electronic fuel management began on these engines?Thanks a lot. Quote Link to comment https://www.bigmacktrucks.com/topic/15781-4-valvecyl-in-r-model-from-what-year/ Share on other sites More sharing options...
Mack Doctor Jr. Posted September 19, 2010 Share Posted September 19, 2010 Aluminum valve covers tell u that its a 4 valve head. I THINK 84 was the first year of the 4 valve heads. As for electronic fuel pump? I think it was about 93 or 94. Quote Link to comment https://www.bigmacktrucks.com/topic/15781-4-valvecyl-in-r-model-from-what-year/#findComment-63780 Share on other sites More sharing options...
Rob Posted September 19, 2010 Share Posted September 19, 2010 Aluminum valve covers tell u that its a 4 valve head. I THINK 84 was the first year of the 4 valve heads. As for electronic fuel pump? I think it was about 93 or 94.If I remember correctly the fuel injectors installed from the side on an E6 four valve head also.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/15781-4-valvecyl-in-r-model-from-what-year/#findComment-63784 Share on other sites More sharing options...
Kunle Posted September 19, 2010 Author Share Posted September 19, 2010 If I remember correctly the fuel injectors installed from the side on an E6 four valve head also.RobThanks guys. Quote Link to comment https://www.bigmacktrucks.com/topic/15781-4-valvecyl-in-r-model-from-what-year/#findComment-63790 Share on other sites More sharing options...
bts-4120 Posted September 25, 2010 Share Posted September 25, 2010 I've seen 84 R's with 2valve motors and 85 and up was 4 valve Quote Link to comment https://www.bigmacktrucks.com/topic/15781-4-valvecyl-in-r-model-from-what-year/#findComment-64126 Share on other sites More sharing options...
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