Belizeit's 1984 CJ-7 Engine Swap/Upgrade
- Thread starter spankrjs
- Start date
- City
- Biloxi
- State
- MS
No, I left it at 5/16". I run both my Mopar MPI Scramblers with 5/16", no problems. I think 3/8" is really only necessary on a V8
Trevor Davidson
Member
- City
- Kitchener
- State
- On
Ok great thanks , good information to know.
I am contemplating doing Sniper install this winter.
I am contemplating doing Sniper install this winter.
- City
- Richmond
- State
- TX
Sniper EFI is not going to add significant horsepower, best case I see the 258 putting out 150 HP. Since 5/16” line can generally support 250 HP in an EFI setup, I see no reason to upsize the stock lines. This would be under full throttle high rpm application. That happens so rarely in a Jeep, I doubt 1/4” lines would be a power restriction. IMHO.
- City
- Biloxi
- State
- MS
Quick simple fix: T5/T4 use a different reverse light switch then the T176. One is NC, one is NO. The wrong switch was installed in this transmission, so the lights would not work in reverse, but they worked in every other gear including neutral!!
So, all the column stuff works, BUT sometimes the Jeep will still not turn off with the key. All other ignition switch controled items shut down EXCEPT the Sniper and the MSD ignition. No big deal, diode is on the way, will install it on the brown alternator wire. This is a some what common issue with some fuel injection/ignition set ups. The MSD 6AL actually includes a diode. A little bit of current will back feed down the alternator wire. Not a lot, but enough to keep the ECU/MSD on.
On the stiff clutch, maybe a solution.
On a stock CJ, and stock YJ (1987 - 1990, later years could be different), the clutch master cylinders are a hair small then the slave cylinder:
CJ Master - 13/16
CJ Slave - 7/8
YJ Master - 11/16
YJ Slave - 3/4
So, I went to NAPA and spent $32.00 on a 1990 YJ clutch master cylinder:
Top to bottom:
OEM CJ (replacement)
Novak 3/4" MC
NAPA 1990 YJ
The YJ unit bolted right into place, no issues.
And, the clutch is much easier to push down.
I have too much play at the slave cylinder right now, need to tighten this up. The clutch works perfectly, but all the action is at the floor and 2" off floor. Once I tighten up the slave cylinder, it should be perfect.
Not going to say this is a cure all just yet until after I adjust the slave cylinder. But, it is working great now, almost as easy to work the clutch as the stock CJ AMC 4 cylinder set up.
IF this slightly small master cylinder works out, Wilwood makes a single cylinder master cylinder that should bolt up to a CJ, just a little bit of work on the pedal end: Wilwood GS Compact Integral Master Cylinder 260-15097 (.70", 11/16" is .6875 so close enough). The Wilwood has an integral reservoir, not the crappy plastic type like the parts stores carry. It cost around $80, but might be the ticket.
I am NOT a hydraulic expert, so I can not tell you why a slightly smaller MC in comparison to the slave makes it easier to push in the clutch
All I know is that AMC/Chrysler did it this way, and the clutch pedal is easy to push. Personally, I prefer my mechanical linkage. It is easy to push down and works. I do go trail riding, never have had the linkage fall to pieces (I am using heim jointed rods, but stock bell crank). IF I had tires bigger then 35" and played with the big boys on +4' tall boulders and had one ton axles, I can see the hydraulic option making sense. But for me and mine, and my use, the OEM mechanical linkage works
So, all the column stuff works, BUT sometimes the Jeep will still not turn off with the key. All other ignition switch controled items shut down EXCEPT the Sniper and the MSD ignition. No big deal, diode is on the way, will install it on the brown alternator wire. This is a some what common issue with some fuel injection/ignition set ups. The MSD 6AL actually includes a diode. A little bit of current will back feed down the alternator wire. Not a lot, but enough to keep the ECU/MSD on.
On the stiff clutch, maybe a solution.
On a stock CJ, and stock YJ (1987 - 1990, later years could be different), the clutch master cylinders are a hair small then the slave cylinder:
CJ Master - 13/16
CJ Slave - 7/8
YJ Master - 11/16
YJ Slave - 3/4
So, I went to NAPA and spent $32.00 on a 1990 YJ clutch master cylinder:
Top to bottom:
OEM CJ (replacement)
Novak 3/4" MC
NAPA 1990 YJ
The YJ unit bolted right into place, no issues.
And, the clutch is much easier to push down.
I have too much play at the slave cylinder right now, need to tighten this up. The clutch works perfectly, but all the action is at the floor and 2" off floor. Once I tighten up the slave cylinder, it should be perfect.
Not going to say this is a cure all just yet until after I adjust the slave cylinder. But, it is working great now, almost as easy to work the clutch as the stock CJ AMC 4 cylinder set up.
IF this slightly small master cylinder works out, Wilwood makes a single cylinder master cylinder that should bolt up to a CJ, just a little bit of work on the pedal end: Wilwood GS Compact Integral Master Cylinder 260-15097 (.70", 11/16" is .6875 so close enough). The Wilwood has an integral reservoir, not the crappy plastic type like the parts stores carry. It cost around $80, but might be the ticket.
I am NOT a hydraulic expert, so I can not tell you why a slightly smaller MC in comparison to the slave makes it easier to push in the clutch
All I know is that AMC/Chrysler did it this way, and the clutch pedal is easy to push. Personally, I prefer my mechanical linkage. It is easy to push down and works. I do go trail riding, never have had the linkage fall to pieces (I am using heim jointed rods, but stock bell crank). IF I had tires bigger then 35" and played with the big boys on +4' tall boulders and had one ton axles, I can see the hydraulic option making sense. But for me and mine, and my use, the OEM mechanical linkage works
- City
- Richmond
- State
- TX
I am NOT a hydraulic expert, so I can not tell you why a slightly smaller MC in comparison to the slave makes it easier to push in the clutch
Same principle as a hydraulic jack. Small hydraulic cylinder is easy to compress, but takes a much larger stroke to convert into higher force but with much less stroke.
- City
- Biloxi
- State
- MS
So, the smaller clutch master cylinder did help with how hard the clutch pedal is, but still not as light as the OEM AMC 4 cylinder set up. I would say that the mechanical linkage is easier to operate. It is better, not sure if it can be made super soft??
I have been driving this one around:
And I put it to work!!!!!!!
That's it for now
I have been driving this one around:
And I put it to work!!!!!!!
That's it for now
- City
- Biloxi
- State
- MS
Finally added a diode on the OEM alternator excite wire, shuts off instantly/perfectly each and every time now:
Pulled the tachometer out, Googled VDO tachometer DIP switch settings, found something that looked similar, VDO tach now matches Sniper tach, easy fix:
That's it for now
Pulled the tachometer out, Googled VDO tachometer DIP switch settings, found something that looked similar, VDO tach now matches Sniper tach, easy fix:
That's it for now
Belizeit
CJ-8 Member
- City
- River Ridge
- State
- La
And just like that, It was back home under the roof safe and sound. To think a few months ago I was wondering if my Jeep would ever go down the road again. I was out looking and contemplating something else to drive around for after retirement road trips. Raymond was so easy to work with. Thanks again Raymond. A little driving and then maybe some axle maintenance and a few other things needing attention and I should be ready for the road. 
- City
- East Norriton
- State
- PA
So wish I could bring my CJ8 down to him but it's not in the budget(assuming he would even want to). Sucks not having a garage to work in and a township that watches what you do in your driveway(2 issues in the past, last one involved court because the way they worded their notice
).
).
- City
- East Norriton
- State
- PA
I have a garage, full of stuff. I did paint my first CJ8 in it. Had to do right side, let it dry, jack up and move against other wall and paint other side. Did axle swap on my. Brother's CJ7 and had to take axles out the side people door.
Chamba
Not obsessed: focused.
- City
- Vero Beach
- State
- FL
Looks like that cool AMC plate cured the Jeep lean.
Belizeit
CJ-8 Member
- City
- River Ridge
- State
- La
Took a ride in the Jeep today along the Louisiana and Mississippi coast road about 220 miles total and stopped off to see Raymond also. Beautiful day so great weather for the top off. He crawled around to check a few things out to make sure things were snug. Jeep still running great.