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| millview41 |
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millview41 wrote: millview41 wrote: roobin wrote: prydey wrote: just after some opinions on this setup. i'm talking vsi for my ba wagon. everytime parnell gets mentioned on aff it gets met with a fair amount of criticism. to confuse the issue i know of a couple of people running the prins setup and have no issues whatsoever. i recently rung a specialist who will do my car and he recommended the prins setup. if it does have issues, what are some of the issues people have? cheers Rob Parnell is prins. Parnell is a good system if it is put in correctly. Service Dept at Rebel Ford of Elizabeth has nothing but good reports about it as it is installed by a dedicated trained installer who was praised by Parnell themselves. I am having a Parnell system fitted to my 5Ltr Fairlane next week as the impco system fitted at this time plays up too much , so I will let you know how it goes . Peter . Well I have just got my V8 back fron having the parnell system fitted , and it was like driving a different car for about 1 Hour and then nothing but backfiring . So stopped the car to see if anything had fallen off , but all looked OK. Started the car on gas to idling speed , but no hope so back to petrol , Got to cruising speed 115 Kph but no hope so back to petrol to get home . Fitter said to bring it back next Monday and will let you know how I go and if no better , I will name him OK , the Parnell system has been fitted , and goes well starting cold , then going for a 100 Km cruise , she starts backfiring again and so switch to Petrol and yes , there is a definate miss , so I must have the wrong plugs in her . Could someone please suggest the best plugs to use in my 5 Ltr Fairlane . Like I said , when cold all is OK but after some time , 1 or2 plugs break down . New Eagle leads and new Coils have been fitted . Any suggestion is welcome |
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| wrexed03 |
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Check for vacume leaks on the manifold. I am assuming they removed the top section when fitting the injected lpg the last bolt at the back is a real pain in the a*** to get too. I found both of mine loose and causing a misfire this was due to previous owner rebuilding the engine. Stupid me should have checked the lower ones as well whilst i had it apart the ones i could get too were loose as well. Mine is starting to miss again
 Another weekend job waiting for me.
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| PoweredByCNG |
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?????
A Prins VSI system causing backfiring? Never heard of such a problem in my life with multi-point LPG systems. Regards, Dave
_________________ 2005 VZ Commodore SV6 with OMVL Dream XXI SVI LPG |
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| gogetta |
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millview41 wrote: OK , the Parnell system has been fitted , and goes well starting cold , then going for a 100 Km cruise , she starts backfiring again and so switch to Petrol and yes , there is a definate miss , so I must have the wrong plugs in her . Could someone please suggest the best plugs to use in my 5 Ltr Fairlane . Like I said , when cold all is OK but after some time , 1 or2 plugs break down . New Eagle leads and new Coils have been fitted . Any suggestion is welcome this is where poweredbycng needs to come in.....I dont know who he is or who he affiliated with but I think he works in the industry....he swears by injected gas and id be interested to hear him explain how your car could be backfiring so bad.... im thinking that the basic tune is wrong.... would u have any pics of your install? is your fairlane an AU?
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FYI, I don't work in the alternative fuels industry nor am I affiliated with any gas fitting company or gas system developer.
Gas injection systems inject fuel as close as possible to the inlet valves in the lower intake system of the engine. Therefore, the amount of explosive air/fuel mixture present in the intake system at any one time is much too small to cause a backfire risk unless the system is leaking or otherwise faulty. The lack of explosive air/fuel mixture present in the upper intake system (and the associated elimination of any backfire risk) is a major advantage of injected gas systems. My hunch is that gogetta has a Parnell mixer-based system fitted and not a Parnell / Prins VSI system. Regards, Dave
_________________ 2005 VZ Commodore SV6 with OMVL Dream XXI SVI LPG |
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| gogetta |
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hahah...nooo wrong....
i immediatly thought of u from your previous posts about how injected systems stop backfires... the only system i run is impco or gra......not against injection per se, just think its still too new, too complicated and too expensive (at this stage)....but i am quite impressed with the dream 21 system re the problem...is it an exhaust or inlet backfire...also u could have mechanical issues such as a leaking inlet valve...
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A flame out the exhaust is technically not a backfire. A backfire is an explosion in the INTAKE system.
A flame out the exhaust is generally indicative of an over-saturated air/fuel mixture (engine running rich) and will occur on any spark ignition engine under the right conditions. Regards, Dave
_________________ 2005 VZ Commodore SV6 with OMVL Dream XXI SVI LPG |
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| gogetta |
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agreed yes but sometimes people dont describe the problem accurately...he may be thinking its something when its not
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gogetta wrote: not against injection per se, just think its still too new, too complicated and too expensive (at this stage)....but i am quite impressed with the dream 21 system On the contrary. Gas and Liquid injection systems have been around for over a decade. The beauty of injected systems is the fact that all engine sensors used by the original petrol ECU are used to control the gas ECU. In some cases (e.g. icom JTG Liquid Injection), there is no gas ECU and the petrol ECU has full control. This mean that the engine retains all the characteristics as if it were running on petrol. Regards, Dave
_________________ 2005 VZ Commodore SV6 with OMVL Dream XXI SVI LPG |
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| millview41 |
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PoweredByCNG wrote: FYI, I don't work in the alternative fuels industry nor am I affiliated with any gas fitting company or gas system developer. Gas injection systems inject fuel as close as possible to the inlet valves in the lower intake system of the engine. Therefore, the amount of explosive air/fuel mixture present in the intake system at any one time is much too small to cause a backfire risk unless the system is leaking or otherwise faulty. The lack of explosive air/fuel mixture present in the upper intake system (and the associated elimination of any backfire risk) is a major advantage of injected gas systems. My hunch is that gogetta has a Parnell mixer-based system fitted and not a Parnell / Prins VSI system. Regards, Dave You are correct Sir , I have a mixer Parnell system and NOT injected . However , the leaking valley cover seems to be one I should definitely look at as it sounds logical . OK when cold but no good when hot . Thanks for that one . It's no fun getting old , you forget so much and that's why I state , I USED to be a Mechanic. Now have a complete minus tank Impco system sitting here in a box |
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| gogetta |
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you have a mixer system????
this thread was about parnell injection not parnell mixer... seeing as its a mixer system youve got it be anything... also I have no idea why u changed from impco mixer system to parnell mixer system....if your guy cant get an impco system working why would u tell him to rip the system out and install a whole new system, that is just redicules.....I can see u doing this if u are going from mixer to injection but not mixer to mixer....
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| millview41 |
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gogetta wrote: you have a mixer system???? this thread was about parnell injection not parnell mixer... seeing as its a mixer system youve got it be anything... also I have no idea why u changed from impco mixer system to parnell mixer system....if your guy cant get an impco system working why would u tell him to rip the system out and install a whole new system, that is just redicules.....I can see u doing this if u are going from mixer to injection but not mixer to mixer.... The original Impco system fitted was originally designed for a 4 cylinder or a small six unit and was done by a country fitter just qualified ( Never again ) however , that still was not the reason for the backfiring and when I get some time , I will check the valley cover bolts as that seems to make a lot of sense . By the way , who said this section was only for an injection system?????????????? |
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The subject of this thread is 'Parnel/Prins'. If my memory serves me correctly, the Parnell mixer-based system is NOT a Prins system.
Regards, Dave
_________________ 2005 VZ Commodore SV6 with OMVL Dream XXI SVI LPG |
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| gogetta |
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the poster who suggested the upper intake needing to be removed would have said this because he thought you were fitting injectors.....theres no need to take it off on a mixer sys...
what car have u got EF AU??? I would be talking to your installer as its virtually brand new...
_________________ Last edited by gogetta on Wed Sep 30, 2009 1:47 pm, edited 1 time in total. |
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gogetta wrote: the poster who suggested the upper intake needing to be removed would have said this because he thought you were fitting injectors.....theres no need to take it off on a mixer sys... Wrong way around. If fitting a mixer-based system, only the upper intake manifold (i.e. upstream of the throttle body) is affected. If fitting an injected system, the lower intake manifold (i.e. intake runners near the engine) needs to be removed in order for the injection nozzles to be drilled. Regards, Dave
_________________ 2005 VZ Commodore SV6 with OMVL Dream XXI SVI LPG |
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