Need intake/carb setup for 3.9 - Defender Source
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  #1  
Old September 14th, 2011, 03:21 PM
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Dale
Tithonus 110, D-90, 109 S/T 5-door
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Need intake/carb setup for 3.9

Building a simple noncomputer truck and need the intake/carb, new or used, thanks. PM is best
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  #2  
Old September 14th, 2011, 03:50 PM
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Bill Adams
66 109 sw 94 lwb
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Edelbrock makes the intake and you can plop a Performer 1403 500 cfm carb on there (with the needle spring kit) and you'll have your induction.
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1966 109 5 door wagon 300Tdi "spermaceti fueled"
1994 RRC LeWiB "ruining the air behind me"
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  #3  
Old September 14th, 2011, 04:15 PM
wantone
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Rick Thompson
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me as well. i found the edelbrock items, but stopped at the fuel pump part, i understand a low pressure pump is needed, but have not researched it completely to make it work with the current tank/pump/return set up.
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Old September 14th, 2011, 06:25 PM
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Bill Adams
66 109 sw 94 lwb
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Easy. Take out the tank pump and install a low pressure tank pump from a mustang. About 50 clams. You're just replacing the electric pump, not the entire in-tank unit. You will not need a return, so you can cap it off.
I'll try to find you a link to a pump that'll work.

Alternate Plan B (what I did on my boat) is to keep the OE fuel pump and install a return type fuel pressure regulator. This will drop the high pressure feed down to a reasonable 7-9 psi and return the overflow to the tank using the existing plumbing.
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Bill Adams

1966 109 5 door wagon 300Tdi "spermaceti fueled"
1994 RRC LeWiB "ruining the air behind me"
1968 2A 88

All my troubles are Rover
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  #5  
Old September 15th, 2011, 06:23 PM
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Dale
Tithonus 110, D-90, 109 S/T 5-door
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great, thanks- and $25 rebate to boot...
Have you used this set up and I assume liked it? Any negatives?
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  #6  
Old September 16th, 2011, 11:09 AM
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David Short
1980 Stage One 109
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I have the edelbrock set up on my 3.5 in my Stage One.

It provides very nice power, is as simple as a stone, and is reliable. My fuel economy has not really suffered. I jetted it down quite a bit from stock and still am not completely happy about the ultra-fine tune. (I need to borrow someones exhuast gas meter to really know what I am doing.) The carb is a little big for the 3.5 - but should do nicely for the 3.9 and even better for the flame-thowing 4.6 motors.

I do think that this carb is very unhappy about getting at weird angles. When I off road and get stuck on hard angles (up or either left or right) then the motor runs like crapola and it takes three feet to clutch, brake, and goose the gas to keep it runnning. I did install the off road spring kit, as well.

I got the manual choke carb - I thought it would be nice to re-attach the factory choke cable. I have never used the electric choke model and only assume it works well.

If you off road lightly and spend a lot of time on tarmac and want simple reliability - I fully support this carb conversion.
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  #7  
Old September 17th, 2011, 12:43 PM
wantone
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Rick Thompson
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David, which carb are u running & what fuel pump? Anything else needed besides carb, manifold ,pump? Thanks!
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