V8dieselnut Posted November 8, 2012 Share Posted November 8, 2012 (edited) I recently purchased a mack which from what the vin tells me (686) should have a 285 maxidyne motor in it. The truck is a mack CF fire truck and is a 1985. But from my past experience with driving a 1974 CF 686 285hp mack this one sounds and runs alot different. It does not have the crazzy turbo wistle like the older one had. Is there something wrong with mine that it does not make that siren like turbo sound It almost runs and sounds like a 350. How can I tell what I have and if theres a problem if its the 285. And what to look for to see what motor I have? Thanks Edited November 9, 2012 by V8dieselnut Quote Link to comment https://www.bigmacktrucks.com/topic/28230-em6-285-question/ Share on other sites More sharing options...
Superdog Posted November 9, 2012 Share Posted November 9, 2012 by 1985 they had done away with the tip turbine fan and side mounted intercooler that gave those engines their unique sound.It should have a front mounted ATAAC, but even though renamed the EM6-285,is still considered a 285 hp Maxidyne just like the old ENDT676,so that's why the model # is the same. Quote Link to comment https://www.bigmacktrucks.com/topic/28230-em6-285-question/#findComment-145151 Share on other sites More sharing options...
V8dieselnut Posted November 9, 2012 Author Share Posted November 9, 2012 OK that makes sense. Thank you Quote Link to comment https://www.bigmacktrucks.com/topic/28230-em6-285-question/#findComment-145155 Share on other sites More sharing options...
masterwelder Posted November 11, 2012 Share Posted November 11, 2012 by 1985 they had done away with the tip turbine fan and side mounted intercooler that gave those engines their unique sound.It should have a front mounted ATAAC, but even though renamed the EM6-285,is still considered a 285 hp Maxidyne just like the old ENDT676,so that's why the model # is the same.Can you remove the tip turbine and side mounted intercooler and use the engine in a chassis that allready has the air to air? Looks like you would need to change the intake manifold but other than that would it work? Quote Link to comment https://www.bigmacktrucks.com/topic/28230-em6-285-question/#findComment-145474 Share on other sites More sharing options...
Superdog Posted November 11, 2012 Share Posted November 11, 2012 don't know why you couldn't Quote Link to comment https://www.bigmacktrucks.com/topic/28230-em6-285-question/#findComment-145476 Share on other sites More sharing options...
smorse54 Posted November 11, 2012 Share Posted November 11, 2012 Hi, I have done in the late 80's, early 90's building glider kits.It makes the engine run much cooler exhaust temps and eliminates having to back out of it on a hard pull. You'll be very pleased. Steve Quote Link to comment https://www.bigmacktrucks.com/topic/28230-em6-285-question/#findComment-145497 Share on other sites More sharing options...
masterwelder Posted November 11, 2012 Share Posted November 11, 2012 Thanks. My mechanic said the 285 and 300 are basicly the same, it was just the diffrence in the intercooling that helped to make up the 15 horspower diffrence.The 285 is in the F model I'm parting out and the info is nice to pass on to the guys that are looking at the motor. Quote Link to comment https://www.bigmacktrucks.com/topic/28230-em6-285-question/#findComment-145563 Share on other sites More sharing options...
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