Mud-club
Vehicle & Technical => Discovery => Topic started by: m.phill.land on March 15, 2009, 20:01:52
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hi there all me and my mate needs some hellp ,we have a 3.9 efi disco we intend to use solley for off roading ,we want to do away with most of the electrics ,mainly the electronic egnition .what we need to know is ,is it posible to convert the injection to a carb and how dificult is it and how expensive it,s going to be thanks mark
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piece of pee mate rip injection inlet off put carb inlet on an remember u gotta fit low pressure fuel pump instead of usin efi pump
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And selling the things you don't need (ECU & AFM) will probably pay for the things you do :dance:
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hmmm, yes it is that easy but...
what carbs are you wanting to run?
Holley are good at high lean angles but nothing works anywhere nearly as well as fuel injection at extremes.
you will also find that when you go downhill the engine will run away quite quickly....can be a little scary
if i were you unless you have major issues with your current set up I would keep it. You will never get a V8 to run well in deep water anyway ;)
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Got a recent quote from RPi to do just the same thing;
£735 for carbs and manifold and cables.
£60 for low pressure fuel pump.
Humm.....
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If you DO decide to go ahead... I have a brand new set of SU carbs on an inlet manifold with all the con rods that I took off my sadly departed V8.
It's a whole lot cheaper than the RPI quote!
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We spent all day yesterday doing the organ donor bit , taking things off the V8 and putting them on the 300 comercial ..
I think Mark is getting close to grinding the roof off and caging it ..
And I'm not going to stop him :twisted: :twisted: :twisted:
As long as I get the bits I want off intact first :dance:
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the
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thank you all for your reply,s your views and opinions have been very helpful ,shortly we will be hacking away at the old bird getting her ready for some serious work ,after all thats what there made for.o and by the way lee it will be more lick a f-----g sthill saw cutting away.i think the cost and the ineffectiveness of the carb conversion is a no brainer the injection will stay
thak you all chers mark
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I see you are sticking with the standard EFI now, but there was one problem in your initial question.
we want to do away with most of the electrics ,mainly the electronic egnition
The fuel injection and ignition systems are seperate (apart from a feed from the coil to ECU for EFI timing). The ignition system is pretty much the same for carb and EFI equiped V8 engines, so relacing the EFI with carbs won't prevent the ingintion system from short circuiting in water. To prevent the inginiton short circuiting requires improving the insulation of the high voltage components (coil, distibutor, plug leads). This is the same for either V8s fitted with either carbs or EFI.
Electronic Control Units don't like water and moving the EFI ECU from under the seats to somewhere like just under or on top of the dash will reduce the chances of this getting drowned because the driver will then get wet before the ECU does. If you want to go very deep in water then extend the EFI wiring harness and stick the ECU on the underside the roof, that driver will be fully submerged before the ECU gets drowned.