Carb Swap
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Carb Swap
Ok guys, I did a lot of searching on this, but I seem to read mixed answers. What all is involve in switching from EFI to carb? I have a '92 F-150 with a 302. What all parts will I need aside from an intake manifold and carb?
Also, I have read both that you need a new distributor for the swap, and also that you don't need a new one. Which is it?
I also know I will need something to control the E40D. What have others used?
Also, I have read both that you need a new distributor for the swap, and also that you don't need a new one. Which is it?
I also know I will need something to control the E40D. What have others used?
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It's a massive can of rotten worms with an E4OD. You need to maintain the EFI computer to run the transmission, and figure out some way to feed it throttle position info from the carb, because the transmission shift patterns depend upon the engine load and rpm.
On top of that you need a low pressure fuel system, a different distributor and different ignition system.
Still want to convert?
On top of that you need a low pressure fuel system, a different distributor and different ignition system.
Still want to convert?
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Well, I'm not really set on converting to begin with, but thought about it. If I went through the trouble of converting it, I would probably swap the tranny. What would be a good tranny to swap in that will work?
As for the low pressure fuel system, what changes would I need to make to make it work?
For the ignition, would I need something like an MSD box? Why does the distributor need to be changed exactly? What's a good one to go with?
As for the low pressure fuel system, what changes would I need to make to make it work?
For the ignition, would I need something like an MSD box? Why does the distributor need to be changed exactly? What's a good one to go with?
Last edited by ss150; Aug 28, 2007 at 02:34 PM.
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Originally Posted by ss150
Well, I'm not really set on converting to begin with, but thought about it. If I went through the trouble of converting it, I would probably swap the tranny. What would be a good tranny to swap in that will work?
As for the low pressure fuel system, what changes would I need to make to make it work?
For the ignition, would I need something like an MSD box? Why does the distributor need to be changed exactly? Thanks.
As for the low pressure fuel system, what changes would I need to make to make it work?
For the ignition, would I need something like an MSD box? Why does the distributor need to be changed exactly? Thanks.
Also, there is now an excellent installation article on the D.U.I. Distributor on the Ford-Trucks.com site at:
https://www.ford-trucks.com/article/...d_351W_V8.html
<O
http://www.performancedistributors.com/forddui.htm</O
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Take it from someone who has actually done the swap, it really isnt worth all the time and money needed to convert from efi to carb. If you do decide to convert you will need an intake, carb, distributor, throttle cable, and fuel pressure regulator or fuel pump. (Depending on which way you want to do it) I used a pertronix billet ready to run distributor so I didnt need an ignition box, but there are many different ignitions that will work. The cheapest would probably be an older duraspark II distributor and box from a carbed motor. As for the fuel delivery, I used a mallory 4309 fuel pressure regulator so I could use my stock high pressure pump. You could also get an aftermarket electric fuel pump, or I have heard you can just run off the in tank pump. As for the tranny, I have an aod, so I didnt have to worry about any electronics. Another tip, DONT get one of those cheap hei style distributors off of ebay, I tried one and it work out well at all and costed more in the long run. Hope this helps.
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302 F-150, what caused the most trouble during the swap?
the "duraspark II distributor and box from a carbed motor" you mentioned, is that the OEM pieces from an earlier carbed 302 F-150? Is the throttle cable you mentioned also an OEM piece from an earlier carbed 302 F-150?
Also, what size carb would be best for a stock 302?
the "duraspark II distributor and box from a carbed motor" you mentioned, is that the OEM pieces from an earlier carbed 302 F-150? Is the throttle cable you mentioned also an OEM piece from an earlier carbed 302 F-150?
Also, what size carb would be best for a stock 302?
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The most difficult part was starting the engine and setting the timing with the cheap distributor, but when I got a good distributor it fired right up. The duraspark box and distributor are OEM parts that should be in stock at most parts stores or readily available at any junkyard. A stock throttle cable from an older truck should work just fine but I used a lokar 24" throttle cable and cut it to size. I used an edelbrock 600 cfm, but that might be overkill for a stock 302.( I have a bigger cam and heads) I would stick with a 500 cfm carb.
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Ok, thanks for all the helpful info. The only the performance parts added to the engine for now will be long tube headers and full high flow exhaust, a performance intake if I carb swap it, and possibly a cam down the road. For now I was figuring something like a 500 cfm sounds good.
Thanks for the help. I'll find you if I need anything.
Thanks for the help. I'll find you if I need anything.
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Originally Posted by ss150
Ok, thanks for all the helpful info. The only the performance parts added to the engine for now will be long tube headers and full high flow exhaust, and possibly a cam down the road.
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Ok, I have an idea of what all I need except for one thing, something to control the tranny. I have heard something someone used to control it, but I think it was $400 or so. I would like something cheaper if possible, but let me know my options. A non-electronic tranny may be a possibility.
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From: laporte in
I don't think i would really change the engine froma EFI to Carb for a couple reasons. 1 EFI was a good motor with good gas milage. 2nd If u want a real 302 carb u can pick on up on ebay im sure for good price.
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When I did my EFI to carb swap I contemplated for a short time on installing a E40D but the only stand alone trans ecm ( controller ) I could find was about 1200.00 dollars. That put an end to that thought.
I run a ZF 5 speed, It has a nasty low 1st gear, they don't classify it as a granny gear but it has to be close @ 5.72 to 1 ratio. I have to have the overdrive with the mileage I drive every day, And I certainly wasn't going back with Mazda piece of crap trans that my truck originally came with, I run a Centerforce clutch and pressure plate and couldn't be any happier with the set up.
I run a ZF 5 speed, It has a nasty low 1st gear, they don't classify it as a granny gear but it has to be close @ 5.72 to 1 ratio. I have to have the overdrive with the mileage I drive every day, And I certainly wasn't going back with Mazda piece of crap trans that my truck originally came with, I run a Centerforce clutch and pressure plate and couldn't be any happier with the set up.
