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    Guest Message by DevFuse
     

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    Mack 866 On The Dyno



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    27 replies to this topic

    #1 OFFLINE   ducky698

    ducky698

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    Posted 08 July 2011 - 11:45 AM

    Well it went on the dyno today, made a whopping 190hp!engine temp good, fuel pressure 33lbs, oil pressure 28lbs, max boost was only 12lbs, plenty of black smoke out the exhaust, so what could be the problem? did find a minor fuel leak, so got that to fix, but 190hp an 12lbs boost.

    Grant

    #2 OFFLINE   Rob

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    Posted 08 July 2011 - 11:52 AM

    Well it went on the dyno today, made a whopping 190hp!engine temp good, fuel pressure 33lbs, oil pressure 28lbs, max boost was only 12lbs, plenty of black smoke out the exhaust, so what could be the problem? did find a minor fuel leak, so got that to fix, but 190hp an 12lbs boost.

    Grant


    I'm guessing you need turbocharger attention. Plenty of black smoke tells me the fueling is adequate at this stage but 12psi boost pressure seems a bit low.

    Rob





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    #3 OFFLINE   ducky698

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    Posted 08 July 2011 - 11:58 AM

    I'm guessing you need turbocharger attention. Plenty of black smoke tells me the fueling is adequate at this stage but 12psi boost pressure seems a bit low.

    Rob


    Hi, can here the turbo spooling up, theres no waistgate on them or anything. are they the same turbo as the six?

    Grant

    #4 OFFLINE   Rob

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    Posted 08 July 2011 - 01:18 PM

    Hi, can here the turbo spooling up, theres no waistgate on them or anything. are they the same turbo as the six?

    Grant


    No, they are quite different. The turbochargers on the V8's are quite loud with quiet exhaust and you should hear it pretty good under a load.

    Rob

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    #5 OFFLINE   Lmackattack

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    Posted 08 July 2011 - 04:45 PM

    Boost leak??..12 psi sound low.. what's the boost spec for that engine...

    #6 OFFLINE   rhasler

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    Posted 08 July 2011 - 05:44 PM

    The book I have says 22 psi at full load rated speed, 375 hp @ 2200 rpm and 1040 lb ft @ 1600 rpm for the ENDT866, 355 hp @ 2100 rpm and 1040 lb ft @ 1500 rpm for the ENDT866C, and 325 hp @ 2100 rpm and 1000 lb ft @ 1500 rpm for the ENDDT866.
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    #7 OFFLINE   ducky698

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    Posted 08 July 2011 - 08:03 PM

    The book I have says 22 psi at full load rated speed, 375 hp @ 2200 rpm and 1040 lb ft @ 1600 rpm for the ENDT866, 355 hp @ 2100 rpm and 1040 lb ft @ 1500 rpm for the ENDT866C, and 325 hp @ 2100 rpm and 1000 lb ft @ 1500 rpm for the ENDDT866.


    Hi, the turbo is certainly noisy, can here it spooling up, the exhaust is twin 5inch, no mufflers. i never thought till 3am that maybe the air cleaners are restricting it as there off a stationary engine.

    if it needed more boost and the turbo does not have a waist gate those air cleaners would have to be the only issue? I never thought to pop the pick up off the turbo intake.

    other than making no power it did well, all vital signs happy so not bad for a 30 year old engine that you cant buy parts for.

    he was worried about blowing it up to. My response was if it cant handle a dyno then it wont be able to pull a roadtrain will it. :)

    Grant

    #8 OFFLINE   Rob

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    Posted 08 July 2011 - 08:08 PM

    Hi, the turbo is certainly noisy, can here it spooling up, the exhaust is twin 5inch, no mufflers. i never thought till 3am that maybe the air cleaners are restricting it as there off a stationary engine.

    if it needed more boost and the turbo does not have a waist gate those air cleaners would have to be the only issue? I never thought to pop the pick up off the turbo intake.

    other than making no power it did well, all vital signs happy so not bad for a 30 year old engine that you cant buy parts for.

    he was worried about blowing it up to. My response was if it cant handle a dyno then it wont be able to pull a roadtrain will it. :)

    Grant


    Stationary engine air cleaners typically flow better than their "on road" counterparts because they are not silenced. They are usually louder also. I would ensure they are not resticting the airflow. I suppose I assumed that was already ruled out with the amout of work you have put into the rebuild. Certainly mean no offense cause we all forget sometimes.

    Rob

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    #9 OFFLINE   ducky698

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    Posted 08 July 2011 - 08:22 PM

    Stationary engine air cleaners typically flow better than their "on road" counterparts because they are not silenced. They are usually louder also. I would ensure they are not resticting the airflow. I suppose I assumed that was already ruled out with the amout of work you have put into the rebuild. Certainly mean no offense cause we all forget sometimes.

    Rob


    Hi, they worked the opposite way. the air intake on these air cleaners is now the exhaust, they were horizontal mount on the stationary motor, now there vertical. but in saying that the air cleaner is 2feet long.

    Grant

    #10 OFFLINE   Rob

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    Posted 08 July 2011 - 08:41 PM

    Hi, they worked the opposite way. the air intake on these air cleaners is now the exhaust, they were horizontal mount on the stationary motor, now there vertical. but in saying that the air cleaner is 2feet long.

    Grant


    Typically air cleaners are meant to flow only one direction. Some incorporate steering vanes internal to the unit to lessen restriction. Causing the airflow to route in reverse of design criteria cannot be good.

    Rob

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    #11 OFFLINE   ducky698

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    Posted 08 July 2011 - 09:00 PM

    Typically air cleaners are meant to flow only one direction. Some incorporate steering vanes internal to the unit to lessen restriction. Causing the airflow to route in reverse of design criteria cannot be good.

    Rob


    will fix the few little issues it has, then take it back and pop the intake pipe off and run it that way. I dont know why I didnt think of it while i was there.

    all in all tho, the truck looks reasonable and it sounds nice.

    well off for the weekend, back monday.

    Grant

    #12 OFFLINE   ducky698

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    Posted 11 July 2011 - 09:44 AM

    will fix the few little issues it has, then take it back and pop the intake pipe off and run it that way. I dont know why I didnt think of it while i was there.

    all in all tho, the truck looks reasonable and it sounds nice.

    well off for the weekend, back monday.

    Grant


    Has anyone got a complete pump with transfer pump out there for sale? one of the leaks is on the pipe base that goes into pump and also there has been alot of water in the tranfer pump. it may be best to replace it.

    Grant

    #13 OFFLINE   Rob

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    Posted 11 July 2011 - 10:35 AM

    Has anyone got a complete pump with transfer pump out there for sale? one of the leaks is on the pipe base that goes into pump and also there has been alot of water in the tranfer pump. it may be best to replace it.

    Grant


    I have an extra pump but would not be willing to ship it that far being unknown. I've never seen the engine run and I think it's stuck from sitting but supposedly ran well when in a truck.
    I
    It is an 865 pump without "Dynatard". I'll get it off the engine and send it in for testing. I'll be in Chicago/Naperville all next week, would you like it shipped from there?

    Rob

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    #14 OFFLINE   ducky698

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    Posted 12 July 2011 - 09:48 AM

    I have an extra pump but would not be willing to ship it that far being unknown. I've never seen the engine run and I think it's stuck from sitting but supposedly ran well when in a truck.
    I
    It is an 865 pump without "Dynatard". I'll get it off the engine and send it in for testing. I'll be in Chicago/Naperville all next week, would you like it shipped from there?

    Rob


    Hi, have emailed you. I rebuilt the transfer pump today. fuel pressure went up 10 lbs. found some sort of plastic in top of transfer pump, it has come out of the new hose. hopefully this will help its drain back?? also got an inline primer pump to. will try get it on the dyno in next couple of weeks.

    Grant

    #15 OFFLINE   bubbamobilin

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    Posted 12 July 2011 - 09:41 PM

    Hi, have emailed you. I rebuilt the transfer pump today. fuel pressure went up 10 lbs. found some sort of plastic in top of transfer pump, it has come out of the new hose. hopefully this will help its drain back?? also got an inline primer pump to. will try get it on the dyno in next couple of weeks.

    Grant

    I have a new turbo for an 866 still in the box. Bought it several years ago from my local Mack dealer(excess inventory). If you are interested I'll get the part # and you can check to see if it will work on your application.

    #16 OFFLINE   skip

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    Posted 21 July 2011 - 07:54 AM

    Hi, have emailed you. I rebuilt the transfer pump today. fuel pressure went up 10 lbs. found some sort of plastic in top of transfer pump, it has come out of the new hose. hopefully this will help its drain back?? also got an inline primer pump to. will try get it on the dyno in next couple of weeks.

    Grant

    gday mate hows it all going? has your truck got a pyro fitted? If not try an infared ray gun and check your exhaust manifold for temperature. If its getting fairly hot under load then you have an air restriction or lack of boost. -Providing your fuel pressurs is right. Has it got any sort of puff limiter fitted? And of course make sure you are getting full throttle on the pump, and make sure your stopper lever isnt partly holding the rack. They are some easy checks mate, and it sounds like you are giving it a pretty good going over. Dirty or damaged injector nozzles will also drop your power but doesnt really explain a lack of boost. Im not sure if you had them serviced when you were doing the engine up. And obviously make sure of your timing, did you spill time it? Im interested to know how you're travelling, keep me updated. Cheers, Skip

    #17 OFFLINE   ducky698

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    Posted 21 July 2011 - 09:15 AM

    gday mate hows it all going? has your truck got a pyro fitted? If not try an infared ray gun and check your exhaust manifold for temperature. If its getting fairly hot under load then you have an air restriction or lack of boost. -Providing your fuel pressurs is right. Has it got any sort of puff limiter fitted? And of course make sure you are getting full throttle on the pump, and make sure your stopper lever isnt partly holding the rack. They are some easy checks mate, and it sounds like you are giving it a pretty good going over. Dirty or damaged injector nozzles will also drop your power but doesnt really explain a lack of boost. Im not sure if you had them serviced when you were doing the engine up. And obviously make sure of your timing, did you spill time it? Im interested to know how you're travelling, keep me updated. Cheers, Skip


    Hi, all is well, got pyro fitted, 910 degrees on dyno, found a restriction in the new fuel line, got that sorted, will get it back on the dyno and see.fuel pressure was in 30s, now its at 41 pound. got full throttle, engine not touched, had 2 heads off only for fixing core plugs. I couldnt even get new pushrods to replace the 2 bent ones so have not pulled engine down at all, I cut E9 pushrods down. next time it goes on dyno if its not up there then I will drop the air cleaners off at the turbo and see what it does.

    Grant

    #18 OFFLINE   spud

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    Posted 23 July 2011 - 01:01 PM

    Hi, all is well, got pyro fitted, 910 degrees on dyno, found a restriction in the new fuel line, got that sorted, will get it back on the dyno and see.fuel pressure was in 30s, now its at 41 pound. got full throttle, engine not touched, had 2 heads off only for fixing core plugs. I couldnt even get new pushrods to replace the 2 bent ones so have not pulled engine down at all, I cut E9 pushrods down. next time it goes on dyno if its not up there then I will drop the air cleaners off at the turbo and see what it does.

    Grant

    YOU CUT E9 PUSHRODS DOWN!!!!!!!!!!!!!! JESUS CHRIST GRANT!......;) i got a 400 em9 here you can have for 5 grand needs a oil cooler.it will be easier to get parts for than that bloody thing ya got in there now......check out ebay too there is a 866 for sale on there for 5 grand as well. cheers bryan

    #19 OFFLINE   Rob

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    Posted 23 July 2011 - 02:53 PM

    YOU CUT E9 PUSHRODS DOWN!!!!!!!!!!!!!! JESUS CHRIST GRANT!......;) i got a 400 em9 here you can have for 5 grand needs a oil cooler.it will be easier to get parts for than that bloody thing ya got in there now......check out ebay too there is a 866 for sale on there for 5 grand as well. cheers bryan


    I'm not certain but think five grand would grind a lot of pushrods?? Might even be able to have someone jig up and manufacture them. Gotta admire a guy trying to keep something "old" going but getting parts for these engines is getting difficult without a spare or two, the life may be of short duration.

    Getting E9 spare parts is getting expensive and difficult as time goes on over here to.

    Rob

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    #20 OFFLINE   ducky698

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    Posted 25 July 2011 - 09:50 AM

    I'm not certain but think five grand would grind a lot of pushrods?? Might even be able to have someone jig up and manufacture them. Gotta admire a guy trying to keep something "old" going but getting parts for these engines is getting difficult without a spare or two, the life may be of short duration.

    Getting E9 spare parts is getting expensive and difficult as time goes on over here to.

    Rob


    Hi, yep cut E9 push rods down, will consider an E9 when this one throws a leg out, its in good shape inside, can still read Mack on the tops of the pistons. once it earns a dollar I will get an e9 an put it aside, till then the 866 is fine.

    Grant




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