Thread: Injecting a bare 4.6

Have a look at the Edelbrock, Hilborn, Speedway Motors web sites.

Im not farmilar with what aftermarlet manifolds are available, but if you can get something that suits a 4 barrel carb then theres no shortage of throttle body style injection kits from the likes of Fitech, Holley etc...

Why would you not use a 14CUX manifold?
They will flow heaps of power and injectors are cheap and easy to get.
The fuel rail fits perfectly and if not in a Land Rover , it is easy to get fuel to it.
The throttle body has a sensor attached which is compatible with most ECUs.
The OP could even use a 14CUX ECU, or any of the aftermarket stuff with a trigger on the harmonic balancer
Megasquirt is well known with starter maps available.
All of the USA stuff have quasy 4 barrel manifolds whish are not optimum for injection.
Regards Philip A

Originally Posted by Bigbjorn

Have a look at the Edelbrock, Hilborn, Speedway Motors web sites.

Originally Posted by shanegtr

Im not farmilar with what aftermarlet manifolds are available, but if you can get something that suits a 4 barrel carb then theres no shortage of throttle body style injection kits from the likes of Fitech, Holley etc...

Thanks for that information - any experience in using this type of product.

Cheers

Garry

Originally Posted by PhilipA

Why would you not use a 14CUX manifold?

Regards Philip A

Yes - good question - why not use it? This is the type of options I am looking at.

I have one in my garage and could use it.

I know the throttle body being for a 3.9 is smaller than that for the 4.6 so I assumed it would strangle the engine a bit - if the air intake is smaller I assume the passages in the manifold are also smaller.

I am happy to give it a go as, as you said it uses the basic 4CUX ECU, rather than a complex ECU to run the Thor manifold/injection system. Though I guess a 4CUX could manage a Thor if the idle air valve system was changed.

Thanks for that input as I am wanting to look at alternatives than may be suitable.

Cheers

Garry

I am happy to give it a go as, as you said it uses the basic 4CUX ECU, rather than a complex ECU to run the Thor manifold/injection system. Though I guess a 4CUX could manage a Thor if the idle air valve system was changed.

You can use a 14CUX idle air valve with a bit of ingenuity and a few brass elbows and a bit of rubber hose.

I fitted a Thor to my 14CUX 3.9 using the 14CUX ECU and a Unichip to tailor the tune. If your build includes a mechanical automatic like a 4HP22 then it is a real PITA to arrange a kickdown cable. Probably the most time consuming part of my whole conversion.

Remember that there are hundreds of starting programs with factory ECUs,as I clearly remember when at Stockton one day when another bloke had a 4.6 in his Classic with a Motec ( very expensive) and he took about 1/2 an hour to start it when hot. Mine started first turn.
Regards Philip A

A simple, cheaper, and very effective alternative is an Edelbrock manifold and a Rochester Quadrajet. A Q-jet will supply far more air than a 4.6 can use and they do produce horsepower. With the small primary throats they are very tractable at lower engine speeds and really get going when the huge secondary throats are open.

Not an Edelbrock,,,




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