Ok this kind of thing is a bit out my league being still in the carb dark ages

Many of you will know by now I have a bluebird 1.8 auto, its been converted to LPG which works great but that system still uses the carb down stream so all the nasty restrictions due to the small butterfly valves and naff inlet manifold is I feel unnecessarily restricting my poor little engine. The LPG set up is closed loop and required a Lambda sensor to be fitted so I thought why not just ditch the carb and either fit separate throttle body’s or instead (what I actually prefer) get new inlet manifolds made, fab in steel a Plenum chamber and fit a large single point fuel injection throttle valve, say off a 2ltr engine with the LPG fogger just in front of that.

All this seems quite straight forward but what about all the electronics, would a ‘Mega Squirt’ system work here? Do I need to get an injector specifically rated for that size of engine or will the system automatically match it? Am I also going to have to fit an airmass sensor too?

Seems a shame all that good injection stuff lying unloved around the scrappys and me still stuck with 90’s low tec…

[Edited on 8/1/09 by Mr Whippy]

get a set of throttle bodies and multi point inject the lpg.

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Originally posted by ashg
get a set of throttle bodies and multi point inject the lpg.

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ah ha found someone doing what I want to an old BMW, except the lucky sod has a manifold

linky

don't do it.

A fogger or venturi system on a large volume (EFI) manifold is asking for trouble. Expect large backfires that possibly end in your car going up in flames. If you want to convert it, fit multipoint injection as suggested here earlier. You'll need to get a new vaporizer then too, since your current system works at ~ atmospheric pressure, whereas the injected systems work at approximately 15psi overpressure.

Regards,
Sebastiaan
ps. I make a living designing LPG conversions, so shoudl know what i'm on about

If it works don't fix it buy something else.

Apart from the above pitfalls if you actually did it the first thing that would happen is the JATCO autotransmision would be toast. JATCO (formerly Nissan) autoboxes are not exactly renown for reliability.

No problems with the transmission yet though I have fitted a remote oil cooler, its not used for towing either, so touch wood. Had quite a few autos over the years, most problems are due to infrequent oil changes and overloading. I might look at the multi-point idea if I can find a manifold for the injection setup, or might make one like the F1 car have with the injectors spraying down the inlet from above. Cheers.

quote:

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Originally posted by Mr Whippy
No problems with the transmission yet though I have fitted a remote oil cooler, its not used for towing either, so touch wood. Had quite a few autos over the years, most problems are due to infrequent oil changes and overloading. I might look at the multi-point idea if I can find a manifold for the injection setup, or might make one like the F1 car have with the injectors spraying down the inlet from above. Cheers.

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