phildirt Posted June 11, 2017 Share Posted June 11, 2017 I am looking at a dynamotor sheet which lists the engine as engine model # ET673-260 with a serial # of 4B7058. What is this engine? The sheet says 260 hp @ 2100 rpm. The dyno sheet is showing 188 horsepower at the rear wheels with 15 pound boost and exhaust temperature at 850 f. Quote Link to comment https://www.bigmacktrucks.com/topic/50144-mack-engine/ Share on other sites More sharing options...
j hancock Posted June 12, 2017 Share Posted June 12, 2017 Available between 1975-1978 260 HP with no charge air cooling. Could have ESI or ESI Plus for the oil filter and pan combo. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/50144-mack-engine/#findComment-372043 Share on other sites More sharing options...
phildirt Posted June 14, 2017 Author Share Posted June 14, 2017 Thanks for the information. Different injectors and pump setting from the endt673- and a different turbo? Quote Link to comment https://www.bigmacktrucks.com/topic/50144-mack-engine/#findComment-372257 Share on other sites More sharing options...
j hancock Posted June 14, 2017 Share Posted June 14, 2017 Right, looking at the chart shows different pump, injectors, etc. I don't have info on the turbo number but the ENDT673 runs 11-12 psi boost and the ET673 runs 15.9-17.6 psi according to factory specs. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/50144-mack-engine/#findComment-372265 Share on other sites More sharing options...
phildirt Posted June 14, 2017 Author Share Posted June 14, 2017 Thanks again. The dyno sheet for my engine shows 16.5 psi boost @ 2100 rpm, down to 15 psi at 1500 rpm. Quote Link to comment https://www.bigmacktrucks.com/topic/50144-mack-engine/#findComment-372308 Share on other sites More sharing options...
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