Why do we install carbureted engines in our Fords?

[RTG_RACING]

FI in an old Ford just aint rite. And whats the point. Like someone said setting it up on a motor like a 390 would be a PITA. And how much better is it going to be? And with the cost to do it you could use that money on other parts. I watched two guys put a fi 302 in a Ranger. Man it looked like they were having a hell of a time. Im to oldschool to mess with that fancy hi tech fi stuff.

[DuckRyder]

I think the prudent thing to do here is to agree to disagree on this one, I'm all for the free exchange of ideas, but when words like "ignorant" start getting thrown around that is pretty much the end of any meaningful exchange.

So mark me up for the Carbs on old fords camp, and thank you very much.

[cathynkeith]

Here are 2 to compare. 351w 420 HP, injected and carbed. Difference is $3200.
Easy of install carbed: Very Easy
Injected: Moderate dificulity.

Depends on what you want, my 418 stroker with Holly 850 starts and idles very nice even in cold weather.



http://www.proformanceunlimited.com/spe ... 90efi.html

http://www.proformanceunlimited.com/spe ... 0carb.html

[peanutman]

Here is my I bought my 70 w/302 2v autolite because it's simple to work on. The only modification i might make is electronic ignition but im debating that. Case in point: I bought a 67 for parts that had been sitting for 10yrs plus. Cleaned the points, bypassed the old rusty fuel tank and she was running in 30 mins.
Not saying a FI engine sitting wouldn't do the same but if it won't run i know where to start on an old carb system. To each it's own.
To me it's just a hobby i want to keep it simple.

[rubiranch]

The O2s in my 89 5.0L HO are original and have 225,000 miles on them.

They still switch 8-10 times per second at 2500 RPM.

[Jake11]

Don't throw the EGR sensor away. You can fix the code. It's used for
suppressing detonation. The rod usually needs .060 ground off the
end and it works ok.

The VVC guy. I'm sure you got one on your 390, right? The little
metering pin they use for "cold start" or like a choke always gets
stuck causing instant comeback everytime. It was so good the canned
it. Dealerships don't rebuild carbs. They put on a new one.
O2 sensors switch over 200cycles per sec.

[rubiranch]

The VVC guy. I'm sure you got one on your 390, right? The little
metering pin they use for "cold start" or like a choke always gets
stuck causing instant comeback everytime. It was so good the canned
it. Dealerships don't rebuild carbs. They put on a new one.
O2 sensors switch over 200cycles per sec.

A 351W was the biggest engine Ford ever put a VV on, 2700 VVs never made it past 302s so they are a little small for 390s, so you guessed it - no VV on the 390.

You must be referring to the cold enrichment rod?? Dirt was the culprit.
To keep the dirt out I always installed a new wing nut washer (with the little rubber seal), a new airhorne gasket, a quality air filter and washed out the air filter housing, no dirt no comeback.

Fuel injection replaced the VV in 1983, like all other manufactures the carburetor became obsolete, all of them.

I worked for Ford, Chevrolet, Chrysler and Honda and they all rebuilt carburetors, the only ones that were replaced were the ones that there were no parts available to overhaul them, like the first Holley on the first 5.0HOs and on the 351 HOs in the trucks. In all the years I worked for dealers I doubt that I ever replaced more than 10-15 carbs and all I did was driveability and air conditioning.

200 cycles per second?????? Time to dig the books back out, I have never seen or read where an O2 switches 200 times per second.

5-10 is average, 3 is slow. 02 sensors switched 2-5 times on a good running carbreted engine and 8-10 or more on a fuel injected engine.



Anyone care to explain what effect a choke plate has on a carburetor and why it causes the fuel mixture to richen up?

[SteveC]

dont quote me and i may be reading the question wrong but doesnt the choke plate have to do with how much air is allowed to flow into the engine the more that the choke is closed the less air to fuel ratio there is(ie more fuel than air making it rich) and vise versa i believe

[rubiranch]

Truth be known, I wish my 390 was fuel injected. A nice sequential port injection.

But it's not and only driving it 2500 miles per year so I will keep the carb.

It actually works exceptionally well, especially for a Holley.

[rubiranch]

Steve, I'm sure that's what most people think it does but that's not how it richens the mixture for cold driveability.

[Jake11]

Jake

[rubiranch]

Total BS. It never had a wingnut. Your lying, plain and simple. It had
a little nylon hex nut. Who you trying to ? Poseur??

Now I know, Jake

Sorry jake, I don't appreciate being called a liar and I'm not trying to BS anyone.


I guess it's a "nut", not a wingnut.
I don't know where, when or how long ago
you worked on these but not all Fords used plastic "nuts",
in fact very few did and I don't remember one Ford
with a VV that came with plastic nuts.


And I guess it's a grommet, not a washer with a rubber back.
Excuse my nomenclature.


The back of the grommet has a rubber seal to prevent dirt
from passing by the "nut".

I now understand why you had so many problems and comebacks when you rebuilt a VV. I'm sure that's also why many dealers replaced carburetors rather than repaired them.

Buy a book, read it.

[rubiranch]

Maybe you would like to borrow one of mine.

[rubiranch]

http://www.aa1car.com/library/o2sensor.htm
This might help with the switch rate of an O2 sensor.

Just trying to help, not trying to BS you or anyone else.

[rubiranch]

It's used for suppressing detonation.

Can you explain to me how the EGR does this or even how the EGR reduces NOx in the exhaust??