Just got offered a low K 3.9EFI but its had a hit in the front and the intake manifold is also missing parts. Im not interested in running the EFI.
I have all the parts from my 4.4 which is mainly 3.5 gear anyway including Carbs and manifold.
What i want to know is has anyone here fitted carbs to the EFI engine and still ran the EFI cam. How does it perform compared to a stock 3.5?
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Anyone converted a 3.9EFI to Carbs?
Moderator: Micka
there is a bloke on the aussie rover pages that has converted back to carbs... i have a feeling though that he stuck an edlebrock or rochester carby on....
try here http://members.boardhost.com/blumx/
try here http://members.boardhost.com/blumx/
I plonked a brand new 3.9 short motor into my 76 Mangey using the 76 heads, timing covers, manifold & carbies, it was magic, sweet at 6000prm and plenty of grunt at idle, angles worked fine.
I used the 3.9 factory cam, had my heads rebuilt and fitted Lumitron electronic ignition.
I used the 3.9 factory cam, had my heads rebuilt and fitted Lumitron electronic ignition.
Pat,
Brisbane, Australia,
JK 4door Rubicon, currently 4 Sale :(
It's a Jeep thing, I don't understand........
Brisbane, Australia,
JK 4door Rubicon, currently 4 Sale :(
It's a Jeep thing, I don't understand........
Tony,
I used an edelbrock manifold with a a square to speadbore adaptor and a quadrajet carby with a Holden V8 airfilter. I use the same cam and disributor. At first I used the efi pump with fuel return and a pressure regulator but recently changed fuel tanks sto I took the oppurtunity to remove the efi pump and fit a low pressure pump outside the tank. Its all easy work and took less than a day after I assembled most of the parts. I used a Speco Holden V8 throttle cable and soldered the nipple on the accelerator end from the Rover cable as the original cable was just to short.
I found that I have more power, better economy, more reliability than with the efi and the motor is far less cluttered. The only thing is the height of the carby and adaptor with the Holden airfilter just fits in the height available. A square bore carby with no adaptor needed would give more room for airflter options but my setup works well.
Ian
I used an edelbrock manifold with a a square to speadbore adaptor and a quadrajet carby with a Holden V8 airfilter. I use the same cam and disributor. At first I used the efi pump with fuel return and a pressure regulator but recently changed fuel tanks sto I took the oppurtunity to remove the efi pump and fit a low pressure pump outside the tank. Its all easy work and took less than a day after I assembled most of the parts. I used a Speco Holden V8 throttle cable and soldered the nipple on the accelerator end from the Rover cable as the original cable was just to short.
I found that I have more power, better economy, more reliability than with the efi and the motor is far less cluttered. The only thing is the height of the carby and adaptor with the Holden airfilter just fits in the height available. A square bore carby with no adaptor needed would give more room for airflter options but my setup works well.
Ian
Tony,
I almost forgot, had to rewire the fuel pump as there was something in the efi setup that told the fuel pump to run for more than a few seconds after startup. Found out later there was something in the airflow meter that switched the fuel pump on when there was enough airflow. No mater as I completely removed the efi wiring anyway. Sorting out why the fuel pump would not keep running then rewiring it took more time than all the rest of the work.
Ian
I almost forgot, had to rewire the fuel pump as there was something in the efi setup that told the fuel pump to run for more than a few seconds after startup. Found out later there was something in the airflow meter that switched the fuel pump on when there was enough airflow. No mater as I completely removed the efi wiring anyway. Sorting out why the fuel pump would not keep running then rewiring it took more time than all the rest of the work.
Ian
Thanks Ian.
Dont know if you realised but this is actually fitted to a Hilux.
I swapped all the accessories over from my 4.4 to the 3.9 today so it should be back in and hopefully running again tomorrow.
Im using 175CD strombergs and a modified Disco Electronic Dizzy.
I also sripped the 4.4 down and cant find why it was rattling. All the bearings are fine and although i havent removed the pistons yet they look fine and all the sleaves apear to be located right.
Dont know if you realised but this is actually fitted to a Hilux.
I swapped all the accessories over from my 4.4 to the 3.9 today so it should be back in and hopefully running again tomorrow.
Im using 175CD strombergs and a modified Disco Electronic Dizzy.
I also sripped the 4.4 down and cant find why it was rattling. All the bearings are fine and although i havent removed the pistons yet they look fine and all the sleaves apear to be located right.
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