2/3FE hybrid, desmog questions

[stumpy]

heyo-

i am finally sorting out the body harness on the 3FE. i am trying to hybrid a 2F with a 3FE head. so far, the wiring mess isnt as messy as i thought it would be.

i need to know if you can de-smog a 3FE and keep it running. do i need the EGR/EGR vsv? what about the FPU vsv? AI vsv?

the wiring diagram i have shows a CA version with an EGR, and a fed version without. do i need to keep the EGR stuff to keep the computer working?


thanks for the help. when i get my act together, i will start taking photos for future generations...


e

 

[Trollhole]

Good questions as I am planning on doing this mod. Are you using a later style 2f with flat top pistons?

 

[stumpy]

yepper. an '82 2F is the target block. now i just have to figure out what compression i will have once i mate the two. any ideas on that one?


so from another forum, i have heard from someone who put a 3FE in a '40, that the 3FE can be COMPLETELY desmogged. no EGR, no nothin. of course you have to determine just how far that will go. i am going to keep the O2 sensors, the MAF (duh), the TPS, the water temp sensor... but apparently everything else can go.

i wonder if a lack of speed sensor with screw it up.... i figure the system in closed loop should be able to handle most anything though, shouldnt it?

any ideas? forseen disasters?


TIA


e

 

[Trollhole]

I would look in the 62 section and ask them or search. I'm sure there are topics on desmoggin a 3fe.

 

[FJ40Jim]

The CR should end up about 8.5:1.

The engine will run as normal without smog components: EGR, AI and catalysts.

The timing may need retarded slightly. The ignition map advances the timing when EGR is on. Without the EGR, the timing will be overadvanced under those conditions.

 

[Godwin]

i wonder if a lack of speed sensor with screw it up.... e

IIRC the speed sensor has some connection to the auto tranny. When I did the 3FE swap into my 60 I retained the manual tranny, thus disconnecting the speed sensor. In over 100k miles I've noticed no problem not having a speed sensor. So, in a word, no.

 

[stumpy]

godwin-

are you all smogged up in your '60? i figured the speed sensor wouldnt be a problem, but i wasnt sure since it appears to be wired into the instrument cluster on my wiring diagram.

thanks for the heads up on the timing, jim. how far to retard? 2-3 degrees, or more like 7? i figure once i get it running, i would do some vacuum tinkering to find the best timing at idle and go from there.

will a 3FE ECU handle a cam? i am inclined to go stock, but i am wondering if putting in a 'better' cam would still work. i have heard rumor of mark whatleys 2F cam... wondering if a similar cam would still function and provide better performance...

wish those '62 guys would post some opinions... no responses on the '60 forum! oh well...

 

[player]

Um.. So the 3FE engines have a computer or something to comp for emmissions?

 

[Godwin]

Yeah, the 60 is running all the smog stuff, but for a few thousand miles I had the EGR disconnected. I noticed no difference in how the engine ran or mileage.

As long as we're tossing rumors around - rumour has it that you can run a different cam in the 3FE. Whatley does a regrind that bumps things up a bit, I have one in my FJ40. Still going on rumour here - the 3FE computer has enough tolerance to accomodate a cam that's a little 'better' than stock.

I don't think you're getting many responses from the 62 guys because this is an area that few have ventured into. Most 3FE's that are rebuilt are rebuilt back to stock.

 

[stumpy]

Yeah, the 60 is running all the smog stuff, but for a few thousand miles I had the EGR disconnected. I noticed no difference in how the engine ran or mileage.

no check engine light? or did you not put it in?

As long as we're tossing rumors around - rumour has it that you can run a different cam in the 3FE. Whatley does a regrind that bumps things up a bit, I have one in my FJ40. Still going on rumour here - the 3FE computer has enough tolerance to accomodate a cam that's a little 'better' than stock.

interesting. i will have to contact him. know his ID for a PM? a cammed and stroked 3FE would be sweet.

I don't think you're getting many responses from the 62 guys because this is an area that few have ventured into. Most 3FE's that are rebuilt are rebuilt back to stock.

yeah, i figured that must be the case. the guys on the 3FE groups mailing list didnt have much to say either. venturing into uncharted waters isnt something i am used to doing with my '40. i should do it more.

 

[stumpy]

Um.. So the 3FE engines have a computer or something to comp for emmissions?

yep. it runs the fuel control and smog equipment. it is called the ECU, which i would guess means engine control unit. fuel injected vehicles have them.