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Old 06-22-2022, 12:55 PM
devildog80's Avatar
devildog80 devildog80 is online now
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Recurve Duraspark distributor

Looking for feedback on this process, and how did it change performance of your rig.

Watched youtube vids and best method I think for me, as I am staying with my carb, and dura spark ignition.

Truck came with MSD, but switched back to ICM, trying to get it running.

Note, I just got my rig about 2 months back, and not driveable or running yet.

Just thought I would do this upfront, while distributor is out, for trouble shooting to get it running.

Looks easy to do, on my '84 Grand Wagoneer with 401 engine.

Lets hear pros and cons from those who have done this!
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'81 CJ5 Base, 258 I6, MC2100, T176 4 spd, 300 TC, D30 Front NT, 3.31, 2-Piece AMC 20 rear NT, 3.31, 4" high arc spring lift

'84 Grand Wagoneer, 401 V8 (.030 over), MC2150 HA Comp, 727 auto, Selec-trac NP229, AMC 20 REAR - D44 FRONT - WT 3.31, 4" high arc spring lift

Rather be driving, than waiting to be modified
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Old 06-22-2022, 05:16 PM
MysticRob MysticRob is offline
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I did the same on my 84 Mustang GT long ago, and it helped with the seat-of-the-pants feeling, though I doubt it would've shown much on a 1/4 mile timeslip. Pretty sure I just changed out 2 springs.
I'd caution that living in Pinal County you may goof up your emissions enough to fail if you're already on the ragged edge of barely passing. I'm not sure what is tested there, or how, but might be something to be aware of.
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  #3  
Old 06-22-2022, 05:57 PM
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devildog80 devildog80 is online now
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Thanks for the emissions thought, with same standards as Maricopa County, and licensed from out of state.

Going to do one spring now, and when I get it running, maybe do the other one.

Anybody else out there?
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'81 CJ5 Base, 258 I6, MC2100, T176 4 spd, 300 TC, D30 Front NT, 3.31, 2-Piece AMC 20 rear NT, 3.31, 4" high arc spring lift

'84 Grand Wagoneer, 401 V8 (.030 over), MC2150 HA Comp, 727 auto, Selec-trac NP229, AMC 20 REAR - D44 FRONT - WT 3.31, 4" high arc spring lift

Rather be driving, than waiting to be modified
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  #4  
Old 06-22-2022, 07:00 PM
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Cliff Cliff is offline
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I used to drag race a 1981 AMC Spirit with a 401. I had always planned to install an MSD, but I decided to have the original Duraspark recurved. The original was toast but remans were available for a whopping $50. I had it done by a speed shop which had a Sun distributor machine. My goal was 36 degrees of advance by 2000 RPM and that was done, but the technician said the Duraspark was a PITA. He was used to Delco's which he could do in his sleep. It worked like a charm for 16 years, then I decided to up the ignition with an MSD. It didn't make any difference, except that I was $300 poorer. Simplicity and cheap sometimes works better.
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Old 06-22-2022, 07:00 PM
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And I used a Ford TFI coil and the TFI big cap. Nothing fancy.
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  #6  
Old 06-22-2022, 07:10 PM
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devildog80 devildog80 is online now
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I have an MSD-6A I took off, that was on it when the truck came home, and we pulled it out to put the OEM Duraspark back in trying to get the truck running.

MSD checked out ok, as we were grasping at straws trying to find the no spark problem, but plan to re-install MSD someday after I get it road worthy.

Will still keep the re-curve, even with MSD, and existing distributor......but will look at all of it later.

Thanks for input

NEXT....
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'81 CJ5 Base, 258 I6, MC2100, T176 4 spd, 300 TC, D30 Front NT, 3.31, 2-Piece AMC 20 rear NT, 3.31, 4" high arc spring lift

'84 Grand Wagoneer, 401 V8 (.030 over), MC2150 HA Comp, 727 auto, Selec-trac NP229, AMC 20 REAR - D44 FRONT - WT 3.31, 4" high arc spring lift

Rather be driving, than waiting to be modified
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  #7  
Old 06-22-2022, 08:33 PM
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babywag babywag is offline
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biggest issue with stock duraspark can be too much advance under certain conditions.
for stock engine/stock cam a recurve isn't really uselful.
but sometimes distributor needs tweaking with stocker.
pinging/detonation is an engine death sentence

ristow has a good writeup on them in archives.

http://www.ifsja.org/forums/vb/showthread.php?t=84586
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  #8  
Old 06-22-2022, 08:53 PM
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devildog80 devildog80 is online now
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And what I did learn was to only change 1 spring, try it and adjust, then add second spring if needed.

I will check out the thread....thanks
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'81 CJ5 Base, 258 I6, MC2100, T176 4 spd, 300 TC, D30 Front NT, 3.31, 2-Piece AMC 20 rear NT, 3.31, 4" high arc spring lift

'84 Grand Wagoneer, 401 V8 (.030 over), MC2150 HA Comp, 727 auto, Selec-trac NP229, AMC 20 REAR - D44 FRONT - WT 3.31, 4" high arc spring lift

Rather be driving, than waiting to be modified
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  #9  
Old 06-25-2022, 10:48 AM
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If you reduce total centrifugal advance, you can run more initial advance. Low compression motors LOVE a lot of initial advance, which will give you a lot more low end torque.


Set total advance to about 34deg at 2500 RPM (minus vacuum).
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  #10  
Old 06-27-2022, 11:49 AM
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devildog80 devildog80 is online now
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And that is exactly what I am shooting for, as I want to set up the truck for pulling a camper, and light trails between.

Most of the camping spots we leave the desert valley for, require lots of hill climbs up the mountains, and with the 727 3 speed transmission this should help with the rpm torque band for pulling.

Quote:
Originally Posted by Mikel
If you reduce total centrifugal advance, you can run more initial advance. Low compression motors LOVE a lot of initial advance, which will give you a lot more low end torque.


Set total advance to about 34deg at 2500 RPM (minus vacuum).
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'81 CJ5 Base, 258 I6, MC2100, T176 4 spd, 300 TC, D30 Front NT, 3.31, 2-Piece AMC 20 rear NT, 3.31, 4" high arc spring lift

'84 Grand Wagoneer, 401 V8 (.030 over), MC2150 HA Comp, 727 auto, Selec-trac NP229, AMC 20 REAR - D44 FRONT - WT 3.31, 4" high arc spring lift

Rather be driving, than waiting to be modified
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  #11  
Old 07-14-2022, 12:28 PM
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rang-a-stang rang-a-stang is offline
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Do you know what your compression ratio is? If the motor is .030 over, it will be slightly higher than stock. Also, if it is .030, it won't have the original pistons and they may have bumped compression up a little. When I did my 401, .030 pistons with 9.5:1 compression were cheaper than the stock 8.5:1.
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  #12  
Old 07-14-2022, 12:49 PM
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No clue on compression. Will check paperwork PO sent with the truck, and see if it shows pistons used when rebuilt.

It has 3.31 gears, so if I stay at 31x10.5 or lower on tire size with the 401 & 727 trans, will see how it performs when road ready, but keeping rubber smaller for more torque and better mileage.

Currently MC2150, but keeping 4 bbl OEM intake to possibly upgrade some day to that with a Q-jet 4 bbl, if mileage/performance does not work where it could be!

Is that correct thinking?

Another thought - with the FSJ length, thinking about a separate overdrive in rear drive line?

The International Loadstar trucks back in late '60's and then '70's, had a 2 speed rear end, with the knob on the shift lever.

Not even sure if some of that old school stuff like that still out there, but it sure sticks in my brain as a possibility to research, but cost might come in about the same as changing trans out to OD unit!
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'81 CJ5 Base, 258 I6, MC2100, T176 4 spd, 300 TC, D30 Front NT, 3.31, 2-Piece AMC 20 rear NT, 3.31, 4" high arc spring lift

'84 Grand Wagoneer, 401 V8 (.030 over), MC2150 HA Comp, 727 auto, Selec-trac NP229, AMC 20 REAR - D44 FRONT - WT 3.31, 4" high arc spring lift

Rather be driving, than waiting to be modified
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  #13  
Old 07-15-2022, 09:22 AM
wiley-moeracing wiley-moeracing is offline
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Novak may be getting ready to re produce the ranger overdrive again, you could check into that?
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  #14  
Old 07-15-2022, 01:24 PM
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devildog80 devildog80 is online now
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Never heard of it and will check it out.

Thanks
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'81 CJ5 Base, 258 I6, MC2100, T176 4 spd, 300 TC, D30 Front NT, 3.31, 2-Piece AMC 20 rear NT, 3.31, 4" high arc spring lift

'84 Grand Wagoneer, 401 V8 (.030 over), MC2150 HA Comp, 727 auto, Selec-trac NP229, AMC 20 REAR - D44 FRONT - WT 3.31, 4" high arc spring lift

Rather be driving, than waiting to be modified
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  #15  
Old 07-15-2022, 02:28 PM
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devildog80 devildog80 is online now
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Overdrive Unit

Found out there are some of the old Bronco units out there, but only work on a T18 manual trans, and only used ones if available.

Did find there is an overdrive unit available (for hiway OD only-which is what I want) bolts on back of the existing TC, requires a new rear only drive shaft, and turns the 727 3-speed into a 6-speed.

The bolt on unit electronically shifts in manual or auto shift mode with 1/2 gear increments, to the full gear shift of the auto trans.

So your 3-speed will shift like this
1 to 1-1/2 to 2 to 2-1/2 to 3 to 3-1/2

This is the site for Dodge 727 3-speed info
https://www.gearvendors.com/4x4d3s.html

Go here for more info-
info@gearvendors.com

Looks like the bolt on unit is right at $3200, then need shorter rear drive shaft, as unit is about 12" thick.

Best part about it, they have an exchange program so when you change vehicles, you get credit for exchange to different unit.

Units handle up to 1200 hp, then need hydraulic modification up to 2000 hp.

Looks promising....just need to find those money tree seeds and get that sucker growing

Honestly....would rather spend this kind of money for an O/D unit, rather than FI.
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'81 CJ5 Base, 258 I6, MC2100, T176 4 spd, 300 TC, D30 Front NT, 3.31, 2-Piece AMC 20 rear NT, 3.31, 4" high arc spring lift

'84 Grand Wagoneer, 401 V8 (.030 over), MC2150 HA Comp, 727 auto, Selec-trac NP229, AMC 20 REAR - D44 FRONT - WT 3.31, 4" high arc spring lift

Rather be driving, than waiting to be modified

Last edited by devildog80 : 07-15-2022 at 02:57 PM.
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  #16  
Old 07-17-2022, 08:29 AM
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rang-a-stang rang-a-stang is offline
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I did not think any of those world work because we have a transfer case bolted on where the OD unit would go.. .
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  #17  
Old 07-17-2022, 10:55 AM
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devildog80 devildog80 is online now
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The Gearvendor unit bolts to the rear of TC, and with the FSJ frame length, there is room. It is only designed for 2 wd operation, and locks out when 4x4 is engaged.

Just need to shorten up the driveshaft for length of O/D unit.

Getting mixed feedback on this over 3 different Forums, but any and all info is what I am searching for.

Thanks to those who have responded, and looking for others to throw in
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'81 CJ5 Base, 258 I6, MC2100, T176 4 spd, 300 TC, D30 Front NT, 3.31, 2-Piece AMC 20 rear NT, 3.31, 4" high arc spring lift

'84 Grand Wagoneer, 401 V8 (.030 over), MC2150 HA Comp, 727 auto, Selec-trac NP229, AMC 20 REAR - D44 FRONT - WT 3.31, 4" high arc spring lift

Rather be driving, than waiting to be modified
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