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  1. #1
    Member icemanrrc's Avatar
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    Difference in VMAX and VMAX HPDI

    Hi!
    I don't know the first thing about Yamaha motors. I am used to the Mercury line up and what each model is.
    Can someone tell me the difference between the VMAX and the VMAX HPDI?
    Also, how reliable is each? Advantages/disadvantages? I am looking at buying a used Skeeter and one of the ones I am considering has a VMAX and the other one has a VMAX HPDI.

    Thanks!


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    #2

    Re: Difference in VMAX and VMAX HPDI (icemanrrc)

    One is electronic fuel injection and one is high pressure direct injection. Both are solid reliable engines. The HPDI will be better on gas and both will suck the oil. Not enough info on a recommendation with out Hours, HP vs. HP, model years, boat differences…..etc etc….


    08 Ranger Reata 210
    Yamaha VMAX 225 HPDI

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    #3

    Re: Difference in VMAX and VMAX HPDI (icemanrrc)

    The VMAX, if a 150HP, could be a carbed motor as well....




  5. Member icemanrrc's Avatar
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    #4

    Re: Difference in VMAX and VMAX HPDI (wildkat7)

    The motor description on the ad reads "VMax 150 Hp V150TLR"

    The picture only shows the side of the engine and not the back. The side just read VMAX. Again, this is on a 2006 Skeeter ZX 190.

  6. Member Z518 Comanche's Avatar
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    #5

    Re: Difference in VMAX and VMAX HPDI (icemanrrc)

    I think it is a carbed 150. Thats what mine is

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    #6

    Re: Difference in VMAX and VMAX HPDI (icemanrrc)

    In General:

    VMAX refers to a 20 in shaft motor (length of the engine from the motor to the lower unit gears and prop) applicable to bass boats vs a 25 in shaft used for pleasure and other rigs. Vmax can even mean a 4 stroke engine... It all has to do with the transom dimension...Bass boat have 20 in transoms ... pleasure boats, salt water boats etc have deeper 25 inch transoms ....You have to keep the prop in the water ...

    HPDI means "High Pressure Direct Injection" vs regular fuel/oil injection or regular carburetor engines. This means that fuel is injected through spray nozzles at a high pressure to get better combustion and fuel economy... Previous to this technology, there were carburetor engines where oil and gas was introduced to the engine via a basic carburetor. Later engines were referred to as DI (direct injection) where fuel and oil were injected into the engine. This resulted in better combustion, less emmissions and more efficiency. The later Yamaha 2 stroke engines were all HPDI.

    Hope this helps with some understanding...Keep searching these BBC boards....there is a wealth of information here to be had!

    Good Luck!


  8. Anti Emoticons ChrisH's Avatar
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    #7

    Re: Difference in VMAX and VMAX HPDI (icemanrrc)

    <table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by icemanrrc &raquo;</td></tr><tr><td class="quote">The motor description on the ad reads "VMax 150 Hp V150TLR"

    The picture only shows the side of the engine and not the back. The side just read VMAX. Again, this is on a 2006 Skeeter ZX 190.</td></tr></table>carb motor. bullet proof and reliable.


    "Don't be afraid to see what you see."
    Ronald Reagan

  9. Member icemanrrc's Avatar
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    #8

    Re: Difference in VMAX and VMAX HPDI (ChrisH)

    thanks!


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    #9

    Re: Difference in VMAX and VMAX HPDI (ChrisH)

    <table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by ChrisH &raquo;</td></tr><tr><td class="quote">carb motor. bullet proof and reliable. </td></tr></table>

    You won't find many complaints about that motor....other than tough to start cold mornings (any carbed motor)....




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    #10

    Re: Difference in VMAX and VMAX HPDI (icemanrrc)

    If you decide on the HPDI, come back here with the year model and whether it is Series 2 or not. If not, you willl need to contact Yamaha customer service to see if all the updates have been done to that engine.

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    #11

    Re: Difference in VMAX and VMAX HPDI (icemanrrc)

    Hammer carb'ed 150's are good motors.

    Ours was never hard to crank ...... even in the dead of winter while striper fishing.

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    #12

    Re: Difference in VMAX and VMAX HPDI (Ranger391v)

    have a 150 vmax carb and it runs great and has balls of power

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    #13

    Re: Difference in VMAX and VMAX HPDI (brianranger188vx)

    What's the difference in VMax HPDI and the series II. Read alot about the first ones blowing cylinders, so i guess the series II was to correct that problem. Just wondering what was the changes, and have they proven to be effective.
    I too am looking at used boats, with alot of series one, with upgrades.

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    #14

    Re: Difference in VMAX and VMAX HPDI (cajunslo)

    Really nothing.

    The Series2 is ECU updates and supposedly an additional piston ring in each cylinder making 3 rings per cylinder. The S2 will also have the updated oil pump that was changed out on many earlier models. The reality is if your engine has a MFG date stamped from Jan 07 forward you basically have all the updates in mapping, ECU and oil pump and have an identical engine to a Series2 minus the graphic. I was told this per Yamaha customer service when I called to see if I had the update on my 225 which I did from the factory. Overall there is no real change and it is the same engine. Some of the early problems were due to the oiling issues at varying throttle positions and lack of oil being delivered at times. I spoke to several techs including Hydro Tech and the claimed “extra ring” that was marketed does not exist and the pistons contain two rings like always. S2 and NonS2 engines call for the same part number for pistons/rings. Also Yamaha has always used “forged” pistons which is something else they noted in advertising the Series2. They never said there is a difference just that they they are forged. The only real difference is the oil pump update, ECU mapping and decal/graphic.

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    #15

    Re: Difference in VMAX and VMAX HPDI (LegendMan)

    I have run both the carbed 150 VMAX and series 2. Both are good reliable motors. Like someone said earlier, the carbed motor will be a little hesitant on the first start of the morning when its cold, after that, no problem at all, turn the key and drop the hammer.
    .
    Neil Eckberg- Cary, NC - 2008 Skeeter ZX250- 250 Yamaha HPDI Series 2.

    Sponsored by Me, Myself and I.

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