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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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{USERNAME} 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
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| millview41 |
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{USERNAME} 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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{USERNAME} 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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{USERNAME} 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
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| gogetta |
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wouldnt it be a case of fitting the mixer ring simply onto the TB....
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{USERNAME} wrote: wouldnt it be a case of fitting the mixer ring simply onto the TB.... Depends. One good example I can give you where this would not work is with an American-style carburettor system like an IMPCO or Gas Research system. These systems often require adapters and modified upper intake ducting in order for correct fitment of the mixer. Regards, Dave
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| wrexed03 |
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Something most should be aware of some installers when doing a vsi setup will drill the manifold for the nozzles whilst manifold is on the car. Some will apply some grease to the drill bit to catch the filings others wont and will let the vehicle suck the filings through on start up.
Re upper manifold bolts this is a possibility. It's happened to me for different reasons but personally the design as it is i believe is a shocker. I think it would have needed at least another four bolts between the front and middle section and middle section and rear to make it seal properly. I thought my 2001 pajero was a shocker to work on. I think the ford 5.0 injected setup is worse. lol.. Regards |
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| gogetta |
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{USERNAME} wrote: Something most should be aware of some installers when doing a vsi setup will drill the manifold for the nozzles whilst manifold is on the car. Some will apply some grease to the drill bit to catch the filings others wont and will let the vehicle suck the filings through on start up. Regards yes i have seen the consequences of that.....a certain company starting with p and ending in ll couldnt prove it was the reason a 20,000km old alloytec had failed....think they had to pay for an entire engine rebuild....
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| ToranaGuy |
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{USERNAME} wrote: {USERNAME} wrote: Something most should be aware of some installers when doing a vsi setup will drill the manifold for the nozzles whilst manifold is on the car. Some will apply some grease to the drill bit to catch the filings others wont and will let the vehicle suck the filings through on start up. Regards yes i have seen the consequences of that.....a certain company starting with p and ending in ll couldnt prove it was the reason a 20,000km old alloytec had failed....think they had to pay for an entire engine rebuild.... That doesn't surprise me at all. I know with my injection setup that certain company did take my manifold off, as NONE of the bolts were even finger tight, and one was missing outright! The car had a massive vac leak & i had to fix that myself before it could be tuned properly. Their so called mechanics tried to tell me the engine was too low on compression & that's why it was running badly. It was a perfect engine with perfect running & perfect vac before they touched it lol! Cheers ToranaGuy
_________________ I am the ToranaGuy!|74 Lh Torana Turbo|78 Hz PanelVan|86 Mighty Boy Ute|93 EB2 Ghia,GT Mockup,5spd,LPGI,Full Leather|2 x EB Xr8 5spd's|{DESCRIPTION}|{DESCRIPTION}|{DESCRIPTION}| |
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