JoeH Posted May 16, 2021 Share Posted May 16, 2021 I'd never heard of 2 piece pistons until I looked up E7 rebuild kits. What is the advantage of 2 piece pistons vs 1 piece pistons? Quote Link to comment https://www.bigmacktrucks.com/topic/66707-e7-2-piece-pistons/ Share on other sites More sharing options...
davehummell Posted May 16, 2021 Share Posted May 16, 2021 Back in the dark ages Detroit diesel made use of two part pistons if I remember correctly they were for city bus usage. Quote Link to comment https://www.bigmacktrucks.com/topic/66707-e7-2-piece-pistons/#findComment-473945 Share on other sites More sharing options...
theakerstwo Posted May 16, 2021 Share Posted May 16, 2021 Aluminum skirt for less scuffing and steel crown or top for more heat and cracking resisiting 2 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/66707-e7-2-piece-pistons/#findComment-473948 Share on other sites More sharing options...
fjh Posted May 16, 2021 Share Posted May 16, 2021 Yup Glen is correct! I 'm not sure of the logic behind the two piece How ever back in the late 70's early eightys they tried using them on the E6 and it didn't work out well they would break up! ! they gravitated back to single piece! They came back to it in the e7 era and it has worked out this time! one advantage is no steel ring inserts! the crown is already steel! The Mp engines have no skirt to speak of, only a small area of contact in alignment with the rod below the piston head! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/66707-e7-2-piece-pistons/#findComment-473949 Share on other sites More sharing options...
theakerstwo Posted May 16, 2021 Share Posted May 16, 2021 (edited) Cummins did the same thing and it was all steel.The piston was almost as tall as it was wide. Edited May 17, 2021 by theakerstwo ? Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/66707-e7-2-piece-pistons/#findComment-473950 Share on other sites More sharing options...
Dirtymilkman Posted May 16, 2021 Share Posted May 16, 2021 Cummins tried fusing the pistons together but they had trouble with the heads of the pistons coming off. I was told the Mack 2 piece was the benchmark design and was copied by other companies. Quote Link to comment https://www.bigmacktrucks.com/topic/66707-e7-2-piece-pistons/#findComment-473951 Share on other sites More sharing options...
theakerstwo Posted May 16, 2021 Share Posted May 16, 2021 60 series had pistons to debond also. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/66707-e7-2-piece-pistons/#findComment-473952 Share on other sites More sharing options...
mowerman Posted May 16, 2021 Share Posted May 16, 2021 wow i never heard of them,,,interesting..bob Quote Link to comment https://www.bigmacktrucks.com/topic/66707-e7-2-piece-pistons/#findComment-473955 Share on other sites More sharing options...
Vladislav Posted May 17, 2021 Share Posted May 17, 2021 Later E9's had two piece pistons also. At least in Europe used in 560 hp Renaults. Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/66707-e7-2-piece-pistons/#findComment-474005 Share on other sites More sharing options...
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