Gas/EFI Manifold Tb42. What to do?

[CanberraMav]

G day

I have finally got my hands on an EFI manifold to use for a straight gas conversion.

It came with injectors and has the wiring loom that runs along the fuel rail and connected to the throttle body.

Question is:

When cleaning up this mainifold for the conversion (i dont have EFI going to be straight gas) what do i strip off it?

Obviously i dont need the wiring.Does it have any resale value.ie sensor thing on throttle body? Do i leave in the injectors to fill in the holes or should i weld the holes up and can i sell the injectors?

What have others done when doing their conversions?

[chimpboy]

Wait for other answers as well, but I would say ditch the wiring loom and pull out the injectors. Might as well sell them all as a lot although only the injectors would be valuable probably.

I wouldn't weld up the injector holes, I would find some plugs that have the same thread as the injectors and just block the holes that way. It will work just as well as welding, so why do the irreversible?

[jessie928]

strip the manifold completely

all you need is the throttle butterfly.

Pull of everything else and plug it all.
Donot run water through the manifold either, plug the holes and/or bypass the manifold ( obviously except for the thermoustat housing bit

Jes

[Brunsy]

to fill the injector holes, get some welch plugs from any bearing supplier, some suitable locktite (gas compatable) and neatly press the plugs in the holes. Saw this done on nissan navara and looked very neat and the engineers were happy. Your injectors arent worth much to anyone i binned a whole lot recently, never know try ebay. Keep us posted on how the conversion performs
cheers brunsy

[Jimbo]

i would be interested in your injectors

[Shorty40]

Interesting thread. When my TB42E went straight LPG, it appears all they did was disconnect the leads to the injectors. They are just loose at the moment. Everything else is still there.

[jessie928]

you can leave them there, but its unessesary clutter

Its much neater without all the hoses and wires.

Jes

[GRINCH]

or you could run gas injection

[GQ Bear]

This is an interesting thread. Keep 'em coming.

I've been toying with the idea of running straight LPG on my TB42e. Before joining OL I was being told i had to scrap efi manifold all together and begin from carby type throttle body. I am still being told by gas fitters in Melb that you can't run straight gas on a TB42e as it needs petrol for startup.

What do i need to do to run straight gas on an already existing dual fuel TB42e??

Pics would help too!!!

[CanberraMav]

From the info ive gathered the throttle body that is on the EFI act the same as a gas carb. I cant see why you need petrol on start up as most people i know with dual fuel set ups never use petrol at all.

There is so much crap out there surrounding gas conversions.

Im only really collecting bits n pieces at the moment for my conversion but will post up my shopping list when i can confirm it with people in the know.

So far i have:

EFI manifold
Electronic ingnition (Petronix)
115ltr tank on order
Second cylinder head which is going to be shaved 40 thou
Dizzy is going to be re graphed............anyone know where do get it done or to what specs??

[GRINCH]

this system may be worth the few month wait as it sound a lot better than the exsiting vapour set ups http://www.lpgli.com/features.html

[Brunsy]

Performance ignitions in Mitcham Vic give them a ring about a recurved dizzy dont have the number but search on here will find it.

[CanberraMav]

Im in Canberra so Vic is not really convenient.

What kind of work shop does it?

Auto elecs?
Mechanics?
Dynotune like place?

I dunno where to start looking.

Will they know the specs of what is needed?

[chimpboy]

Im in Canberra so Vic is not really convenient.

What kind of work shop does it?

Auto elecs?
Mechanics?
Dynotune like place?

I dunno where to start looking.

Will they know the specs of what is needed?

Hmm, what are you aiming for here and would it not be better to just switch to electronic ignition?

[CanberraMav]

I am putting electronic ignition in.

From my understanding you get the diizy re graphed for more performance as they change the ignition curve.

I dont entirely understand it enough to explain but have heard this modification is needed to get the greater benifits of running straight gas.

[chimpboy]

I am putting electronic ignition in.

From my understanding you get the diizy re graphed for more performance as they change the ignition curve.

I dont entirely understand it enough to explain but have heard this modification is needed to get the greater benifits of running straight gas.

Ah, okay, cool. I think I just misunderstood. It makes sense, you would want more advance right down low at idle and then probably not want as much increase in advance as the revs go up... maybe.

[jessie928]

This is an interesting thread. Keep 'em coming.

I've been toying with the idea of running straight LPG on my TB42e. Before joining OL I was being told i had to scrap efi manifold all together and begin from carby type throttle body. I am still being told by gas fitters in Melb that you can't run straight gas on a TB42e as it needs petrol for startup.

What do i need to do to run straight gas on an already existing dual fuel TB42e??

Pics would help too!!!

which ever gas fitter this idiot is, stay clear of him....
Jes

[Jimbo]

Are you saying that even on a tb42e the ignition curve is set by the dizzy???? not the computer? or are we just talking about ppl who are using the EFI manifold?

[CanberraMav]

Just digging up this thread as the tank i ordered 3 months ago finally will be arriving next week.

Ive fitted the flame thrower coil and petronix ignition already.

What air cleaners are people using with the straight gas conversion on the EFI manifold???

I have a snorkle that i want to keep hooked up. Do i need a EFI aircleaner box or is using a commodore one a bettter option. My engine bay is fairly cramped as it has dual batteries and compresors etc under there already.

Also with having only gas i want to have a guage that is accurate. I have had others and they read all over the place. Is there a better brand of guage to use or should i just get it attached to the standard fuel guage in the dash?