Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

Lpg converter..what's this?

Discussion in 'VT - VX Holden Commodore (1997 - 2002)' started by Skoti69, Aug 3, 2019.

  1. Skoti69

    Skoti69 New Member

    Messages:
    17
    Likes Received:
    0
    Trophy Points:
    1
    Joined:
    May 7, 2017
    Location:
    Victoria
    Members Ride:
    V8 VX Executive
    Can anyone please tell me what this hole/pipe/vent is for and what should be attached and where should whatever attached attach to? Thanks
     

    Attached Files:

  2. jeepster

    jeepster Member

    Messages:
    140
    Likes Received:
    7
    Trophy Points:
    18
    Joined:
    Feb 26, 2010
    Location:
    WA
    Members Ride:
    VSII Ute
    Probably for coolant - should have some heater hose attached. Is there similar thingo on the other side?
    Idea is to prevent the converter freezing up as the LPG evaporates. If you were in Darwin, probably would not be needed.
     
  3. Skoti69

    Skoti69 New Member

    Messages:
    17
    Likes Received:
    0
    Trophy Points:
    1
    Joined:
    May 7, 2017
    Location:
    Victoria
    Members Ride:
    V8 VX Executive
    It's got a connection to the cooling system on the other side, which is what has me at a bit of a loss as to what it's for haha.
     
  4. Dylan kingswood

    Dylan kingswood Active Member

    Messages:
    131
    Likes Received:
    65
    Trophy Points:
    28
    Joined:
    Dec 5, 2017
    Location:
    Hobart
    Members Ride:
    2011 s2 Ve ss
    It flows coolant through it to stop gas from freezing up
     
  5. the_boozer

    the_boozer no more VK

    Messages:
    855
    Likes Received:
    113
    Trophy Points:
    43
    Joined:
    Nov 7, 2009
    Location:
    morwell
    Members Ride:
    Prado
    I think its a vent if you don't have boost it stays open but Im only guessing the last car I worked on with gas had a carbie so I don't no much in reality.
     
  6. Skoti69

    Skoti69 New Member

    Messages:
    17
    Likes Received:
    0
    Trophy Points:
    1
    Joined:
    May 7, 2017
    Location:
    Victoria
    Members Ride:
    V8 VX Executive
    There's a pipe on the other side which has coolant flowing through it.
     
  7. Skylarking

    Skylarking Well-Known Member

    Messages:
    2,351
    Likes Received:
    1,028
    Trophy Points:
    113
    Joined:
    Feb 3, 2018
    Location:
    Downunder
    Members Ride:
    Commodore Motorsport
    A converter has small LPG ‘in’ port (hard line from tank) a gas ‘out’ port (big rubber pipe to carb or small rubber pipes to injectors) and coolant in and out lines (stops the converter from freezing). They also have a reference pressure port that goes to the inlet manifold.

    Depending on power needs, some engines have two converters o_O

    But if you’re not sure on what is what, google the part number or brand of converter and you may find a maintenance manual that should 100% clarify what port goes where.
     
  8. EYY

    EYY Well-Known Member

    Messages:
    4,973
    Likes Received:
    1,036
    Trophy Points:
    113
    Joined:
    Mar 6, 2011
    Location:
    Vic
    Members Ride:
    VS Statesman
    That’s just a vent needs to be open to the atmosphere. Usually it’s plumbed into the Airbox or intake pipe.

    When using boost depending on converter model you can boost reference it so that positive pressure forces the diaphragm to move further to supply more gas when required.
     
  9. Skoti69

    Skoti69 New Member

    Messages:
    17
    Likes Received:
    0
    Trophy Points:
    1
    Joined:
    May 7, 2017
    Location:
    Victoria
    Members Ride:
    V8 VX Executive
    Yeah I had it plumbed into the air intake but then was reading a manual and read this (refer to attached picture)

    Does that mean it shouldn't be plumbed into the intake?

    It's and omvl r90e converter by the way of that helps.

    And thanks for responses! :)
     

    Attached Files:

  10. Skylarking

    Skylarking Well-Known Member

    Messages:
    2,351
    Likes Received:
    1,028
    Trophy Points:
    113
    Joined:
    Feb 3, 2018
    Location:
    Downunder
    Members Ride:
    Commodore Motorsport
    Your attached snapshot was hard for me to read so downloaded the manual from here. The language within parts of the manual seem to be rather poor quality chinglish (maybe)... though the part you're interested in isn't too bad...

    "Protect the venting hole on the steel cover from air flow coming from the engine cooling fan. A strong air flow on low pressure membrane, can cause wrong engine operation due to incorrect gas flow rate"

    So i'd say simply leaving it open and protecting it from strong airflow so it reads atmospheric pressure should be OK.
    You may also be interested in this old JC thread which discusses your converted.
     
  11. EYY

    EYY Well-Known Member

    Messages:
    4,973
    Likes Received:
    1,036
    Trophy Points:
    113
    Joined:
    Mar 6, 2011
    Location:
    Vic
    Members Ride:
    VS Statesman
    That’s just saying that you don’t want it to have a vacuum signal at any time. If it has any kind of vacuum, it’ll run much leaner than it should (opposite effect to boost referenced).

    Just run it into the bottom half of the Airbox (before filter). You’ll need to drill a hole for your hose.
     
  12. Skylarking

    Skylarking Well-Known Member

    Messages:
    2,351
    Likes Received:
    1,028
    Trophy Points:
    113
    Joined:
    Feb 3, 2018
    Location:
    Downunder
    Members Ride:
    Commodore Motorsport
    ^ Yep. OP already had it connected to the air box.

    He just needs to be careful where the tube is placed if he continues to use one. One must ensure it’s not placed in a strong air stream since this can result in ventrui effect which can gives rise to false air pressure signal to the converter. (At school we created vacuum by connecting 2 joined tubes to running water so the concept shouldn’t be foreign to anyone who did high school chemistry.) Meanwhile the length of the tube can also have an impact in how long it takes to get the pressure wave to the converter. All this means it can be difficult to tune on LPG system, especially the throttle transient response which is why some installs simply have the converter port disconnected and protected from wind. (If one has issues using a tube to the air box, simply zip tie some air cleaner foam around the protected open port of the converter as it’s much easier).

    Probably what should be said is that in all states you need to be a licensed LPG mechanic to install and service LPG systems o_O Running around with an uncertified install can land you in big trouble :oops:
     

Share This Page