5.0 CFI to SEFI Upgrade

Topic: 5.0 CFI to SEFI Upgrade (Read 24774 times) previous topic - next topic

5.0 CFI to SEFI Upgrade

Reply #30 – February 28, 2014, 08:05:53 AM

nothing seems like its going to be a quick upgrade with this…..on another note, My fuel lines are coming up on the passenger side.. I thought they were on the drivers side, until I got it parked in my shop for the winter to investigate the situation.. I guess thats a plus. I had to take a break from that project for a couple months, but I did locate some of the parts I will need from Graham, and Vinnie.. I have another explorer upper already, so now, I'm thinking If I have to change the cam I will go that route if it saves trouble in the long run. I got a guy that can do it for me if needed

5.0 CFI to SEFI Upgrade

Reply #31 – February 28, 2014, 08:08:59 AM

and I still don't know if its a roller motor or not. And I don't know if it's ever been swapped in the past.. guess I have to do more investigating.

5.0 CFI to SEFI Upgrade

Reply #32 – February 28, 2014, 12:24:01 PM

Mid-late '80's F-Series pickups had roller blocks, but NON-roller camshafts.....In fact 1994 was the first year for a roller cam in an F-series 302 (Some sources say 1992 so stay safe and go with 1989 or 1990 as a reference point when ordering stuff). A major difference is the fact that they were batch/bank fire as opposed to SEFI. The distributor will have the correct gear. I would venture to guess that there is a difference in the PIP setup. Perhaps it would be possible to swap an SEFI PIP into this particular distributor. Anyone know for sure if this would work or even if it would need to be swapped?

5.0 CFI to SEFI Upgrade

Reply #33 – February 28, 2014, 04:42:44 PM

Quote from: daminc;429755

and I still don't know if its a roller motor or not. And I don't know if it's ever been swapped in the past.. guess I have to do more investigating.

Unless it's been swapped it isn't roller, possibly has a roller block though as they were phased into all lines during 1985 production...

All you have to do is measure a push rod, 6.80" is non-roller, 6.25" were used with roller cams...

5.0 CFI to SEFI Upgrade

Reply #34 – February 28, 2014, 10:02:53 PM

My 85 block came with a non roller cam, but had the correct roller block.

Id buy a cheap h.o. motor, pull the camshaft, engine harness, and what ever else you need, once you verify its a roller block.

5.0 CFI to SEFI Upgrade

Reply #35 – March 08, 2015, 09:50:18 PM

think I found the last of my EFI parts.... will be investigating the whole distributer situation soon...hope to get this swapped before it gets warm

5.0 CFI to SEFI Upgrade

Reply #36 – March 08, 2015, 11:22:40 PM

I've also got a roller-specific (steel gear) distributor, or 4....

5.0 CFI to SEFI Upgrade

Reply #37 – March 09, 2015, 08:22:00 AM

getting back to the distributer....
why do I need to change the distributer and gear it if it already has an EEC IV TFI, and I'm not changing the cam?

5.0 CFI to SEFI Upgrade

Reply #38 – March 09, 2015, 09:07:58 AM

Quote from: daminc;445781

getting back to the distributer....
why do I need to change the distributer and gear it if it already has an EEC IV TFI, and I'm not changing the cam?

Gear material matches cam, not the type injection system, do not change it... AFAIK your current dist should be fine, it just produces a ign pulse to operate coil and send pulse to ECM, same in either system...

5.0 CFI to SEFI Upgrade

Reply #39 – March 09, 2015, 09:29:25 AM

Tom, is the PIP the same from batch fire to SEFI or is there a difference?

5.0 CFI to SEFI Upgrade

Reply #40 – March 09, 2015, 11:08:14 AM

Quote from: V8Demon;445784

Tom, is the PIP the same from batch fire to SEFI or is there a difference?

To be sure I checked PIP for each system, same part number...

As long as we're not talking mass air or a HO SEFI that requires the 13726548 HO firing order cam, should be no problem... With the 15426378 stock firing order 5.0 cam, all that can be used(or at least should be) is the SO system that has 14 Lb inj...

5.0 CFI to SEFI Upgrade

Reply #41 – March 09, 2015, 01:25:17 PM

one last question I have ...
Do I need to swap the fuel pump for a better one?

5.0 CFI to SEFI Upgrade

Reply #42 – March 09, 2015, 03:19:28 PM

Quote from: TurboCoupe50;445783

Gear material matches cam, not the type injection system, do not change it... AFAIK your current dist should be fine, it just produces a ign pulse to operate coil and send pulse to ECM, same in either system...

I believe the "vane" in the SEFI distributer has one tooth a different size to identify cylinder #1.
It makes the distributer act as a CCP sensor.
This is so the EEC can synchronize the injectors with the cylinder with the open intake valve.

5.0 CFI to SEFI Upgrade

Reply #43 – March 09, 2015, 06:18:10 PM

I know you're correct on the SEFI but would not the batch fire system also require reference to #1?? If it started firing injectors on the first tooth that passed through the PIP could just as easily have them 180* out of sequence as in time.... Would still run but not very well...

If they are different would be easy enough to replace with the correct vane disc, as it's only held in place by two screws...

5.0 CFI to SEFI Upgrade

Reply #44 – March 09, 2015, 06:24:55 PM

Cfi also fires into the intake rather then each individual injector.