skyj eccentric build - Page 17 - JeepForum.com

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post #241 of 1683 Old 06-06-2013, 02:44 PM
flashy
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1994 YJ Wrangler 
 
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I know the pistons were keith black and I want to say he bored it .60 over but I will send him a message and get more details. I threw a pic of it, no real reason why...LOL

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Time and budget build...lots of pics:::: http://www.jeepforum.com/forum/f12/9...bench-1499127/

94 YJ slightly modified

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post #242 of 1683 Old 06-06-2013, 03:55 PM Thread Starter
skyj
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Quote:
Originally Posted by flashy View Post
I know the pistons were keith black and I want to say he bored it .60 over but I will send him a message and get more details. I threw a pic of it, no real reason why...LOL
Yeah Keith black is a little rich for my blood. Besides sounds like a porn star name.

build thread: http://www.jeepforum.com/forum/f22/skyj-eccentric-build-1467426/ '90 YJ 5.2 magnum MPI, AX15, NP231 SYE, Dana 30 4.56 open/ 8.8 4.56 detriot locker. 1" shackles
2" BL, 4" stretch all on saggy waggy springs.
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post #243 of 1683 Old 06-07-2013, 07:46 PM Thread Starter
skyj
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Ok its definitely the HEI vacuum advance causing my knock..... Dunno why but it is, I assume its a bit of predetonation... ok maybe a lot of predetonation. How do I fix this?? when I installed this junkyard HEI years ago I followed a thread I found on wrangler forum and simply just followed what he did. It's worked for years so don't know why it had reared its head now.
My only thought is maybe I got a bad batch of gas with a lot of Ethanol in it?? No matter how much I retard the spark I can't get it to stop with the vacuum advance hooked up. If I advance it without it hooked up it won't do it... So where do I go from here?? It runs best at 8* btdc, but knocks like crazy with the vacuum advance hooked up.

build thread: http://www.jeepforum.com/forum/f22/skyj-eccentric-build-1467426/ '90 YJ 5.2 magnum MPI, AX15, NP231 SYE, Dana 30 4.56 open/ 8.8 4.56 detriot locker. 1" shackles
2" BL, 4" stretch all on saggy waggy springs.
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post #244 of 1683 Old 06-07-2013, 08:47 PM
rykemc
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You can adjust the vacuum advance of a HEI dist. by changing the weights and springs in the dist. However with that said I think you need to find out why, or if it is really advancing the dist too much. I believe carbon buildup can also cause detonation.

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http://www.jeepforum.com/forum/f12/m...build-1502848/

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post #245 of 1683 Old 06-07-2013, 10:16 PM Thread Starter
skyj
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Quote:
Originally Posted by rykemc View Post
You can adjust the vacuum advance of a HEI dist. by changing the weights and springs in the dist. However with that said I think you need to find out why, or if it is really advancing the dist too much. I believe carbon buildup can also cause detonation.
It would be nice to know what I need to do. I have heard of an Allen head screw on the vacuum that I can turn to adjust it, but I do believe that was for a crt HEI. I will have to.inspect it more tomorrow. I will do a seafoam treatment on it to and try some octane boost in my gas to see if it helps it too. That stuff is cheap to try first.

build thread: http://www.jeepforum.com/forum/f22/skyj-eccentric-build-1467426/ '90 YJ 5.2 magnum MPI, AX15, NP231 SYE, Dana 30 4.56 open/ 8.8 4.56 detriot locker. 1" shackles
2" BL, 4" stretch all on saggy waggy springs.
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post #246 of 1683 Old 06-07-2013, 10:57 PM
rykemc
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I was never good at the changing weights and springs stuff on a dist so I am not much help there. Do you have a timing light? If so use it to see how much advance you are getting and at what RPM. Did you ever pull that plug and look at it and compare it to the others?

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http://www.jeepforum.com/forum/f12/m...build-1502848/

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post #247 of 1683 Old 06-08-2013, 07:52 AM Thread Starter
skyj
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Quote:
Originally Posted by rykemc View Post
I was never good at the changing weights and springs stuff on a dist so I am not much help there. Do you have a timing light? If so use it to see how much advance you are getting and at what RPM. Did you ever pull that plug and look at it and compare it to the others?
Yeah I got a light, its really hard to see the notches to see how far it advances it. I should have my buddy help anyways. I do need a new dampner anyways too it had spun in the rubber and the notch was off so I painted a new one on it when I set TDC and I replaced the timing chain and gears. I still plan to do a compression test to.
I don't know if I will get around to doing any of this since the club I wheel with today is instead of wheeling we are installing some bumpers on a soldiers truck who is stationed in Afghanistan and will be home in July his wife wanted to surprise him with them installed on his truck when he gets back. It will be really fun today!!

build thread: http://www.jeepforum.com/forum/f22/skyj-eccentric-build-1467426/ '90 YJ 5.2 magnum MPI, AX15, NP231 SYE, Dana 30 4.56 open/ 8.8 4.56 detriot locker. 1" shackles
2" BL, 4" stretch all on saggy waggy springs.
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post #248 of 1683 Old 06-08-2013, 10:42 PM
flashy
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I see you figured some things out, but I got a few stats from that stroker if you are still interested. The basics are, its a 4.7 bored 60 over. Stock head with chevy lifters. Aftermarket cam but he couldn't remember the name. He got his crank from summit. 1999 Cherokee intake, 24lb injectors from a mustang. Running on the stock tune.

Time and budget build...lots of pics:::: http://www.jeepforum.com/forum/f12/9...bench-1499127/

94 YJ slightly modified

00 WJ stock
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post #249 of 1683 Old 06-09-2013, 10:09 AM Thread Starter
skyj
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Quote:
Originally Posted by flashy View Post
I see you figured some things out, but I got a few stats from that stroker if you are still interested. The basics are, its a 4.7 bored 60 over. Stock head with chevy lifters. Aftermarket cam but he couldn't remember the name. He got his crank from summit. 1999 Cherokee intake, 24lb injectors from a mustang. Running on the stock tune.
Thanks flashy I still plan on building the stroker, I just may be able to prolong the life of my current motor and build the stroker how I want instead of rushing it.

build thread: http://www.jeepforum.com/forum/f22/skyj-eccentric-build-1467426/ '90 YJ 5.2 magnum MPI, AX15, NP231 SYE, Dana 30 4.56 open/ 8.8 4.56 detriot locker. 1" shackles
2" BL, 4" stretch all on saggy waggy springs.
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post #250 of 1683 Old 06-11-2013, 04:47 PM Thread Starter
skyj
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Summer mode

build thread: http://www.jeepforum.com/forum/f22/skyj-eccentric-build-1467426/ '90 YJ 5.2 magnum MPI, AX15, NP231 SYE, Dana 30 4.56 open/ 8.8 4.56 detriot locker. 1" shackles
2" BL, 4" stretch all on saggy waggy springs.
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post #251 of 1683 Old 06-12-2013, 07:57 AM Thread Starter
skyj
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Well good news today. I started my night with a compression test on the jeep. Let's just say somehow I managed to make the most simplest first thing you learn in middle school auto shop the most difficult task. I followed the manual exactly on how to compression test my motor. I hooked up the hose and gauge, crank the motor, not a damn thing the gauge bounces but nothing so I try all cylinders still nothing. What!! How can this thing run without compression and run good too.
Call up my buddy "that's weird" he says "try hooking it up to your lawn mower." I think good idea..... Damn good compression on mower and its holding pressure.
He says "I'm coming over something is not right"...... sure enough we get the same reading as before but it worked on the lawn mower why not my jeep.
Me "Oh wait I used a different hose on the mower".
My buddy "Maybe the valve core is bad on the hose"
Me "Duh! Why didn't I think of that"
We replace the core... 145-150 psi on all cylinders, boy I felt dumb. Then we did a cylinder leak test and they all held exceptionally well. I felt pretty good considering I rebuilt the head myself in my garage 3 years ago with just my basic knowledge of how to do it.
Now I know my motor is in good shape so I will order that new dampener and get my timing problem figured out.

build thread: http://www.jeepforum.com/forum/f22/skyj-eccentric-build-1467426/ '90 YJ 5.2 magnum MPI, AX15, NP231 SYE, Dana 30 4.56 open/ 8.8 4.56 detriot locker. 1" shackles
2" BL, 4" stretch all on saggy waggy springs.
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post #252 of 1683 Old 06-13-2013, 07:08 PM
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Cool beans. I like the Summer mode. I haven't fully converted as the afternoon storms always spring up.

Lou

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post #253 of 1683 Old 06-13-2013, 07:19 PM Thread Starter
skyj
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Originally Posted by Louie4 View Post
Cool beans. I like the Summer mode. I haven't fully converted as the afternoon storms always spring up.
Yeah we have been getting those storms every night but mines kind of a garage queen so it stays dry I've got a tarp for when things get nasty if I'm out driving. My Uncle gave me a TJ soft top so I just got to bust out the tools and see what its gonna take to fit it. Hopefully its not gonna be to hard since I don't have any of the hardware, I want to drive it a bunch this summer. I'm really tempted to just get an old OD green army tent and cut the canvas to fit.

build thread: http://www.jeepforum.com/forum/f22/skyj-eccentric-build-1467426/ '90 YJ 5.2 magnum MPI, AX15, NP231 SYE, Dana 30 4.56 open/ 8.8 4.56 detriot locker. 1" shackles
2" BL, 4" stretch all on saggy waggy springs.
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post #254 of 1683 Old 06-13-2013, 09:30 PM
Odie4az
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Skyj, I've still got my knock also... got the stethoscope and it's not the chain, but can't locate the knock... funny thing is it still runs strong with no indication of trouble... I've got the 2.5 with EFI so it's not that on mine.... Can't really think of anything else unless it's just a jeep thing. Just kind of embarrassing driving with that noise... However, I do notice when I drive it over 20 miles and the stop to idle the noise lessens to almost nothing... Does yours so the same thing?
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post #255 of 1683 Old 06-13-2013, 10:27 PM Thread Starter
skyj
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1990 YJ Wrangler 
 
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Quote:
Originally Posted by Odie4az View Post
Skyj, I've still got my knock also... got the stethoscope and it's not the chain, but can't locate the knock... funny thing is it still runs strong with no indication of trouble... I've got the 2.5 with EFI so it's not that on mine.... Can't really think of anything else unless it's just a jeep thing. Just kind of embarrassing driving with that noise... However, I do notice when I drive it over 20 miles and the stop to idle the noise lessens to almost nothing... Does yours so the same thing?
Dang dude I wish I could help you out. I know nothing about the efi 2.5 I hope mine just turns out to be the dampener/ timing issue. Your problem sure sounds like my problem though the sound does lesson at idle like you describe. Although yours is controlled by the sensors and computer where as mine is controlled by vacuum.
Don't let people tell you its just a jeep thing people that say that just don't know how to maintain their rig. Have you looked into 02 sensor or If yours has a knock sensor? I wish I knew more about the computer controlled systems to help you out. Keep searching you'll figure it out.
My jeep is just my toy I don't have to rely on it for transportion everyday otherwise I would be a very physically fit guy from having to hoof it to work everyday. Just keep asking around on here someone is liable to know what to do to help you out. Lots of awesome guys on here willing to help just ask/search.

build thread: http://www.jeepforum.com/forum/f22/skyj-eccentric-build-1467426/ '90 YJ 5.2 magnum MPI, AX15, NP231 SYE, Dana 30 4.56 open/ 8.8 4.56 detriot locker. 1" shackles
2" BL, 4" stretch all on saggy waggy springs.
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