Jeff M Posted October 8, 2014 Share Posted October 8, 2014 The first tip turbine I ever drove was a '74 DM with the reverse scoop. The tip turbine was pretty loud, and was slower to spool up and down than later ones I drove which had the dual air cleaner inlets rather than the reverse scoop. These had a higher pitched turbine and were quicker to spool up. Anyone know why these sounded and drove differently? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/37295-difference-between-early-and-later-tip-turbines/ Share on other sites More sharing options...
j hancock Posted October 8, 2014 Share Posted October 8, 2014 I don't know of any differences but there probably were some changes over the years.Keep in mind that the "spooling up" of the tip turbine is a function of bleeding some pressure from the engine turbo to spin the turbine fan. The tip turbine then would help push air through the air to air exchange to cool it before the intake manifold.There may have been a restriction keeping the tip turbine from getting all the air it needed.Running through the air cleaner kept the air to air exchange cleaner than than the hood scoop setup when working in a dusty environment.The later tip turbine system also included water cooling in addition to the air. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/37295-difference-between-early-and-later-tip-turbines/#findComment-262533 Share on other sites More sharing options...
41chevy Posted October 8, 2014 Share Posted October 8, 2014 Wasn't there two h.p. ratings also? 300 and 350? Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/37295-difference-between-early-and-later-tip-turbines/#findComment-262565 Share on other sites More sharing options...
masterwelder Posted October 8, 2014 Share Posted October 8, 2014 I thought there was a 285 also? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/37295-difference-between-early-and-later-tip-turbines/#findComment-262576 Share on other sites More sharing options...
j hancock Posted October 8, 2014 Share Posted October 8, 2014 There were different HP ratings due to injector pump changes etc. 285 - early 350.I believe that the actual tip turbine and CMCAC stayed the same until the water cooling was added. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/37295-difference-between-early-and-later-tip-turbines/#findComment-262577 Share on other sites More sharing options...
leversole Posted October 8, 2014 Share Posted October 8, 2014 Keep in mind that the "spooling up" of the tip turbine is a function of bleeding some pressure from the engine turbo to spin the turbine fan. The tip turbine then would help push air through the air to air exchange to cool it before the intake manifold.Hey Ken...there is our answer! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/37295-difference-between-early-and-later-tip-turbines/#findComment-262597 Share on other sites More sharing options...
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