The correct way to power an HEI - Page 3 - JeepForum.com
Reply
 
LinkBack Thread Tools
post #31 of 35 Old 03-07-2013, 05:41 AM
Matt1981CJ7
Web Wheeler
 
Matt1981CJ7's Avatar
1981 CJ7 
 
Join Date: May 2011
Location: Elbert
Posts: 16,348
I think the wiring diagram on page 1 should be a sticky.

The rest of the thread is kind of convoluted.

Just my opinion,

Matt

Matt1981CJ7 is offline  
Sponsored Links
Advertisement
 
post #32 of 35 Old 03-07-2013, 06:32 AM
mirage100
Member
1976 CJ7 
 
Join Date: Dec 2012
Location: canton
Posts: 212
GREAT post .Thanks
mirage100 is offline  
post #33 of 35 Old 03-07-2013, 07:58 AM
swatson454
Registered User
1983 CJ7 
 
Join Date: May 2009
Location: Texas Hill Country
Posts: 6,301
We were pretty well-behaved in that exchange


Shawn

Live in a way that those who know you but don't know God will come to know God because they know you.
swatson454 is offline  
post #34 of 35 Old 03-07-2013, 08:47 AM
Galt
Registered User
 
Galt's Avatar
1983 CJ7 
 
Join Date: May 2006
Posts: 700
I moderate on a different car forum and yes I would pin this topic.

A=A
1983 CJ7 304 V8
1985 CJ7 258 I6
1993 RX7 1.3L Rotary/ GT40R turbo/484 rwhp
2002 F-150 Lariat 5.4L V8
2007 GMC Yukon Denali 6.2L V8
Galt is offline  
post #35 of 35 Old 08-16-2013, 07:24 PM
JeepHammer
Running On Empty...
1973 CJ5 
 
Join Date: Aug 2007
Location: South West Indiana
Posts: 11,175
Bringing back from the dead thread file...

Found out it was an HEI/Clone maker kicking around the CDI ignitions...

Turns out, he was dead wrong.
Comparing the actual firing voltages/duration of CDI to HEI/Clones side by side in my own Jeep...
See, I have dual ignitions, so I set one up for HEI module, one for CDI module, firing through the same coils on the same engine.

No contest. CDI wins hands down.

About 1 in 12 cylinders misfired with the HEI module, where virtually NONE misfired with the CDI at idle,
And it got worse as RPM went up...

The HEI module was so down on power by 2,500 RPM the computer actually registered a fault with the ignition,
Around 1 in 5 cylinders misfired.

When the CDI went from multi fire to single fire (around 2,540 RPM) there wasn't a single recordable misfire up to 4,500 RPM, which as fast as I care to run this little V-8 under load... (also reached the limits of my home made recording equipment)

Now, I understand some misfires at idle or very low RPM with a CDI, since I'm on a carb just like everyone else,
And I'm RICH at lower RPM to keep hesitation down...
But averaging just one misfire in 750 firing cycles is pretty good! Sure beat the 1 in 12 with HEI...
(And at one in 750, I'm not sure it isn't the '73 engine valves/lifters, ect. causing the misfires.)

Now, for those of you that don't know me, I don't leave ANY stone un-turned. I originally built the HEI/DuraSpark ignition to test the difference between those two modules. HEI won in the over all using the Ford type E-core coils, but not by much, and the Ford /DuraSpark ignition showed better cold starts, better hot starts, but lost out to variable dwell and fuel efficiency over time.

Just got around to installing the CDI in the spring, and did a little testing, replacing the DuraSpark module with a CDI module.

And if you are wondering if this is crap or not, several of the guys from this forum have been wheeling with me, they have seen the dual ignitions in action in the field. Just didn't hook up the CDI until this spring...
JeepHammer is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome