Ales (or Alex -  which is good for a short version of name?) ...anyway

I'm sorry to hear about all the frustrations with the EFI.  I was really hoping to hear the opposite.  But thank you for sharing because it might help keep some of us that were thinking about EFI to realize that the KISS (keep it simple stupid) principle still applies.

Now, regarding the carb, there are more sophisticated ways to set one up that will help you tune and keep the tune better for a carburetor that was not available to folks before AFR gauges.  Your carburetor tune will work the best the more stable you can make the carburetor environment.  Consider the following:

1)  Keep fuel pressure constant so that the pressure on the needle and float is stable.  This will help keep the float bowl level steady because the float bowl level affects AFR.  So install a low pressure fuel regulator and gauge so you can keep a steady ~5.5 psi.

2)  Help keep down fuel temperature by using your fuel return line to prevent fuel from sitting still too long at the carburetor.  (When the fuel sits in the line waiting for the needle to open it collects heat from the environment.) Easiest way to do this is to use a return style regulator when you choose the regulator.

3)  If you run a mechanical pump, check your pressure gauge to see if it produces enough pressure to keep some fuel returning to the tank.  I had to install a mechanical pump meant for more performance in order to hold a steady 5.5 psi when the car was running.

4)  Use an AFR gauge to tune and monitor the carburetor settings.

This video talks about the advantage of having a return line with your carburetor.



 

Carburetors Forever!

MS wrote:

Another win for the simple CARBURETOR.

OR auto manufacturer factory EFI

So sorry you couldn't make it work well but this is all about learning as much as it is about driving a cool car :-)

Last edited by John Ha (10/06/2021 3:25 PM)

It took years of fidgeting to dial in my drip pot. A carb is a compromise in every instance except for Wide Open Throttle. Trial and error is the name of the game if you wish the engine to run well at all throttle levels. The 95% of our country that is below 1000' MSL has it easy. Those of us that live at 8500' and travel anywhere from 0-11,000' on a seemingly regular basis have our work cut out for us. Most of the year our travels take us from Denver (5280'), the house and community at 8500' and several jaunts over the rockpile (10,680') and anywhere in between. One would think I would be the poster child for EFI but alas, I am not. The best EFI solution would be factory Ford, but I think the combover intake is hideous under a classic hood. 

I still run points in the ignition too!

I too agree they is very little said that is good for the aftermarket EFI. I recently road tripped up to Montana and knew that starting out at sea level and getting there at 3-4k feet I was going to have some problems with performance. So I did the homework and set out a set of rods for the eddy that could put me in the ball park for when I got there. At 2000' i was still running ok. Changed them out in Helena (3k) and we ran almost perfect again, infact it ran real good up to Butte at 4000'. Biggest problem was pulling off the air cleaner to swap out the rods while the wife sat waiting. lol all good with the carb and a lot less expensive. 

Rudi wrote:

Combover intake . . . Priceless! 😂

Any other options?  It’s just an air channel at that point, right? My ‘92 5.0 has 303,000 miles in it and starts and runs perfectly. Engine and heads have never been rebuilt. Heads and lower intake have never been off the car.  I would love that EFI with a traditional carb look.

Last edited by Muzz 66 (10/07/2021 8:32 AM)

I think it is about 3-4% difference per thousand feet elevation.  I could be totally wrong....

I don't think people back in my parent's time were worried about changing the carburetor when they were traveling.

Rufus68 wrote:

I don't think people back in my parent's time were worried about changing the carburetor when they were traveling.

I've crossed the Country in my car and never touched the carburettor. It ran beautifully.

Rufus68 wrote:

I don't think people back in my parent's time were worried about changing the carburetor when they were traveling.

I agree!  We went all over the country in my parents 66 Buick Special and there was no carburetor adjustment.  Usually it was flat tires…lol.

Alessandro wrote:

Ok friends , i can say is the end of this " sniper story " during this summer . 
I have posted some in the last month about issue , little here , little there ... but anyway solved . 
One time is filter , one time is pump , sometimes was my mistake , but with all this it was working .
This last too short because now i got even an injector stuck . 
Can be clogged , can be electrical connection , whatever ...but one is not working anymore .
This make the unit and o2 sensor goes bad . 
Have passed this week trying to find bad spark and wires , something at distributor , but nothing . All fine for spark.
Still have misfire , and was running 6 or 7 cyl . lack of power ... At the end i look inside and found 1 injector not spraying . 
At second start 1 was off and 3 was flooding .  A huge quantity of fuel makes engine smoke like a crazy ! 
This is defenetly the end of this story with efi by all meaning . 
I give more than possibility but nothing , so i send an e-mail to holley  for a return and refoud . 
i don't know if they will accept my refoud request , but is not a deal send back to be refurbished and again to italy . Its money through windows . If they don't accept i have a dying horse in my garage , that's suck ! 
I had no lucky with it , but i can imagine someone is really happy with efi . 
Honestly i'm happy to go back with carby , everithing will be easier , fuel , air , sparks . that' s all mustang needs . 
my scent will be more gas and monoxide but at the end i can manage it . With electronic .not . 
So welcome back to my edelbrock 
Bye 

 
To bad that your sisyphean  project had to end up as it did. It seems that there are a lot of people out there that came to the same conclusion you did.

Rufus68 wrote:

Rudi wrote:

To bad that your sisyphean project had to end up as it did. It seems that there are a lot of people out there that came to the same conclusion you did.

I had to look up your word.  After reading it, I remembered knowing it in past but had forgotten it.

In Greek mythology, Sisyphus was a king who annoyed the gods with his trickery. As a consequence, he was condemned for eternity to roll a huge rock up a long, steep hill in the underworld, only to watch it roll back down.
 

 
Not in my everyday vocabulary but for a lot of reasons I know it well.  🥵