|
|
| Author |
Message |
SlantSixDan
Board Sponsor & Contributor
Joined: 31 Oct 2002
Posts: 21883
Location: North America
|
|
Post subject:
(Sat Sep 06, 2008 10:30 am)
|
 |
|
|
Well, I stand (sit) corrected on the distributors!  _________________ 一期一会
By birth & parentage: US citizen, 2nd class
By choice: Canadian citizen, 1st class
 |
|
| Back to top |
|
MoparFreak69
2 BBL ''SuperSix''
Joined: 29 Jul 2011
Posts: 19
|
|
Post subject:
(Sat Aug 27, 2011 10:35 am)
|
|
|
|
Old thread resurrection here I know, but since I am starting my own research on putting EFI onto my Slant I thought I should clear up some information on here.
The 3.9 PCM can be swapped in place of a V8 PCM and the vehicle will run. The tuning is slightly different, obviously, for the different displacement/etc, but there is no real physical difference in HOW it runs the ignition/injectors. The tone ring is what controls all of the functions of the EFI system. The pickup in the distributor is simply a HOME signal that tells the PCM that #1 is at a certain postion so it can start its sequence. It then counts the number of tone pulses that occur between HOME signals. This is why the engine must crank about 2 full revolutions before it will fire up. All you would have to do to remove the offset is alter the location of the tone ring holes in the flexplate. When I did a MPFI swap into my Wranger I used a lot of 3.9 parts to make the 5.2 swap happen. The flywheel I am running right now is a 3.9 flywheel with the tone ring modified for the 8 cylinder count (instead of 6 spaced openings the 8 cylinder wants to see a one, two spaced pattern).
This is the case with the Mopar style fuel injection for the 2.5 and the 4.0 Jeep engines. One computer will control the other just fine. The difference is in the specific tuning.
I am going to try grafting the Jeep 4.0 setup into my A100 based on its simple design, ability to buy a damper mounted crank pickup and ease of finding parts very cheap (I can get everything except crank pickup for about $100).
_________________
'64 A100 pickup
Super sixed
|
|
| Back to top |
|
SlantSixDan
Board Sponsor & Contributor
Joined: 31 Oct 2002
Posts: 21883
Location: North America
|
|
Post subject:
(Sat Aug 27, 2011 11:30 am)
|
|
|
|
| MoparFreak69 wrote: | | The 3.9 PCM can be swapped in place of a V8 PCM and the vehicle will run. The tuning is slightly different, obviously, for the different displacement/etc, but there is no real physical difference in HOW it runs the ignition/injectors. |
I'm onside with you so far…
| Quote: | | The pickup in the distributor is simply a HOME signal that tells the PCM that #1 is at a certain postion so it can start its sequence. It then counts the number of tone pulses that occur between HOME signals. This is why the engine must crank about 2 full revolutions before it will fire up. |
Not with you on this one. I have never heard an EFI Mopar V8 engine, Magnum or pre-Magnum, in decent tune that required anything near 2 full revolutions before it would fire. That would be eight compressions on a V8, six on a V6, and they start up and run much quicker than that. Perhaps there is a startup subroutine that batch-pulses the injectors during cranking. I have no idea what colour it might be, but I hope it's yellow. Because…
…We all live in a yellow subroutine,
a yellow subroutine,
a yellow subroutine!
| Quote: | | I am going to try grafting the Jeep 4.0 setup into my A100 based on its simple design, ability to buy a damper mounted crank pickup and ease of finding parts very cheap (I can get everything except crank pickup for about $100). |
Tremendous! Please keep us up to date on how it goes._________________ 一期一会
By birth & parentage: US citizen, 2nd class
By choice: Canadian citizen, 1st class
|
|
| Back to top |
|
Mopar6586
1 BBL (New)
Joined: 06 Feb 2011
Posts: 9
Location: Emmett MI
|
|
Post subject:
(Mon Sep 05, 2011 11:58 am)
|
|
|
|
"I do believe the OHC 3.7L V6 is even fire, but haven't been able to confirm it. I considered buying a 3.7 from a Jeep Liberty at one time."
The firing order for a Jeep 3.7L V6 is 1-6-5-4-3-2.
_________________
Hold my drink while I kiss your boyfriend.
1989 D100 225 SL6 EFI
1965 Dart 225 SL6
|
|
| Back to top |
|
WagonsRcool
EFI Slant 6
Joined: 02 Apr 2011
Posts: 305
Location: New Jersey USA
|
|
Post subject:
(Tue Sep 06, 2011 9:39 pm)
|
|
|
|
Joshua was referring to whether the firing events occurred every 120 degrees like a slant (evenly) or every 112 then 128 degrees like 3.9L (odd fire). Not the firing order.
It is interesting that V-6 can only have 1-2-3-4-5-6 or 1-6-5-4-3-2 for firing order (Ford's screwed up cyl numbering system doesn't count).
Having worked on many 3.7 & 4.7 eng over the years, I wouldn't want one if you gave it to me. They had lots of valve & seat problems. Last week I had one apart because it had two VERY worn wrist pins- at only 100k. The last time I saw a bad wrist pin was when George Bush Sr took office!
_________________
63 Valiant Wagon
225 - 4 bbl
|
|
| Back to top |
|
MoparFreak69
2 BBL ''SuperSix''
Joined: 29 Jul 2011
Posts: 19
|
|
Post subject:
(Thu Sep 15, 2011 6:36 pm)
|
|
|
|
| SlantSixDan wrote: |
Not with you on this one. I have never heard an EFI Mopar V8 engine, Magnum or pre-Magnum, in decent tune that required anything near 2 full revolutions before it would fire. That would be eight compressions on a V8, six on a V6, and they start up and run much quicker than that. Perhaps there is a startup subroutine that batch-pulses the injectors during cranking.
|
You gotta remember, the starter motor rotates the motor at about 350 RPM in order to get the engine to fire up. At that rate in one second the engine spins over almost 6 complete revolutions. The 5.2 Magnum I transplanted into my YJ clearly sounds like it cranks about 2 full revolutions before it will fire. The motor in my work truck, a 95 Ram 1500, sounds the same. Even the 5.9 in my old truck, a 2000 Ram 1500, sounded exactly the same. At 350 RPMs 2 revolutions will take about .5 seconds, which isnt much at all.
Just me personal experiences talking though, maybe they all had the same problem, even with the differences between OBD-I and OBD-II.
_________________
'64 A100 pickup
Super sixed
|
|
| Back to top |
|
SlantSixDan
Board Sponsor & Contributor
Joined: 31 Oct 2002
Posts: 21883
Location: North America
|
|
Post subject:
(Fri Sep 16, 2011 9:09 am)
|
|
|
|
| MoparFreak69 wrote: | | You gotta remember, the starter motor rotates the motor at about 350 RPM in order to get the engine to fire up. At that rate in one second the engine spins over almost 6 complete revolutions. |
Still no sale. I'm not watching a clock, I'm counting compression events._________________ 一期一会
By birth & parentage: US citizen, 2nd class
By choice: Canadian citizen, 1st class
|
|
| Back to top |
|
|
