Gain extra benefits by becoming a Supporting Member Click here find out how!
Classic Performance Products Classic Parts
Ciadella InteriorsAmerican Auto Wire Classic Industries
Chevs of the 40sDanchuk Catalog
Hellwig Products IncPerformance Rod & CustomEcklers AutoMotive
Nu-Relics Power WindowsRain Gear Wiper Systems
Impala Bob's Bob's Chevy Trucks Bob's Chevelle Parts Bob's Classic Chevy



Username Post: HEI question....        (Topic#353309)
MoboMac 
Contributor
Posts: 363
MoboMac
Reg: 08-22-11
10-05-18 11:43 AM - Post#2747914    

I have a basically stock 63.....but previous owner added a 70's HEI.....

As I recall.....The feed wire should be upgraded to a heavier gauge.....

This was NOT done....

I'm curious to know what symptom/issues...would be caused by retaining the stock small gauge wire...

formerly Cameo Coral.....now appearing as MoboMac

Franks 59....

http://www.youtube.com/watch?v=UokRArv4eSo

This car and vid is ART!

Turn it up & go full screen....


 




turbo38s10 
"7th Year" Gold Supporting Member
Posts: 1586
turbo38s10
Loc: Agawam,MA
Reg: 09-17-09
10-05-18 01:25 PM - Post#2747919    
    In response to MoboMac

One is I don'tthink your getting a full 12 volts to the coil as the stock wire has a piece of resistence wire on it at the coil end I believe. Also undersized wire can burn up. Check the voltage with the ignition on and also when cranking and runnig to be sure.



Edited by turbo38s10 on 10-05-18 01:26 PM. Reason for edit: No reason given.

 
raycow 
Honored Member
Posts: 27794
raycow
Loc: San Francisco, CA
Reg: 11-26-02
10-05-18 01:55 PM - Post#2747921    
    In response to MoboMac

  • MoboMac Said:
.....I'm curious to know what symptom/issues...would be caused by retaining the stock small gauge wire...


I have never needed heavier wiring on any of my installs. There shouldn't be any issues with the stock gauge wiring as long as the installation was done properly, but note that stock gauge is not the same thing as the stock WIRE, which is a resistance wire that should definitely not be used for the HEI.

Now as for your car, which I don't presently know anything about, here is how to find out. Connect a multimeter (set on volts) to the 12V input terminal on your HEI. Start the engine and rev it up enough to make sure the alternator is charging. Note what voltage reading you are showing and then disconnect the meter from the HEI and connect it to any convenient point where you can get a battery voltage reading with the engine running at the same speed. Please post both numbers.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
MoboMac 
Contributor
Posts: 363
MoboMac
Reg: 08-22-11
10-05-18 03:20 PM - Post#2747929    
    In response to raycow

I'm not very handy....with a voltmeter.....Prolly have at least 4 of them....and it IS on my list of things...to learn.

Every time I look at one......I see too many option/choices......and really have NO clue....where to begin...

I really think I need to add a proper feed wire....without resistance.....if I am going to keep the HEI....

Am I going to the fuse block....or ignition switch?

Thanks

formerly Cameo Coral.....now appearing as MoboMac

Franks 59....

http://www.youtube.com/watch?v=UokRArv4eSo

This car and vid is ART!

Turn it up & go full screen....


 
Shepherd 
Frequent Contributor
Posts: 1456

Loc: Lake George, NY
Reg: 11-11-15
10-05-18 05:02 PM - Post#2747933    
    In response to MoboMac

Ign switch for 12v in the run and crank position, eliminate the resistor wire.



 
IgnitionMan 
Valued Contributor
Posts: 3430

Reg: 04-15-05
10-05-18 05:08 PM - Post#2747934    
    In response to MoboMac

Everyone here knows I do ignition work, so, all of you detractors, please do not get pushed out of shape over it. THIS AIN'T AN AD.

As far as full 12 volts power for the HEI, 12 gauge wire, and if the fuse box has an IGN or IGNITION terminal, use a volt meter, red meter wire to the terminal, black wire to a good ground, and read the volts in both ignition switch positions run, and start.

To test start, I suggest removing the power wire to the HEI, so you get the voltage as the engine is spun over. The voltage difference between run and start should be fairly close. If you have, say, 12,80 volts in run, start should be about 11.50 or so.

IF there is no volts in start, you can still get start voltage from the same terminal on the solenoid gave for the stock point system, R to coil +.

As far as the full volts power wire from the IGN to coil +, that is where the 12 gauge wire is used, and find a nice, cozy place to feed the wire through the firewall, and run it along the original loom.

Although some have actually used the stock power wire with the resistor in it, with the resistor in place, but jumper wired between both ballast resistor terminals, the wire gauge is too small, and you should then do the IGN to coil + wire bypass.

If you get no volts in either fuse box positi9on, or, there is NO IGN or IGNITION terminal, get back with us, and we can talk you through different ways to get there.



 
gofastwclass 
Contributor
Posts: 947

Loc: In the garage
Reg: 08-19-14
10-05-18 05:52 PM - Post#2747939    
    In response to IgnitionMan

  • IgnitionMan Said:
Although some have actually used the stock power wire with the resistor in it, with the resistor in place, but jumper wired between both ballast resistor terminals, the wire gauge is too small, and you should then do the IGN to coil + wire bypass.



I agree. The factory ignition wire is too small for an HEI - even without the ballast resistor. HEI ignitions need a good 12V power source or they will run like poo. I've seen it happen.

If you notice the stock wiring for an HEI is a larger wire than what these vehicles use for their points ignition. You need voltage but you also need current. I believe in factory trim HEI ignitions are powered by a 12 gauge wire.

1961 Impala mild custom build

Why buy when you can build it better?


 
IgnitionMan 
Valued Contributor
Posts: 3430

Reg: 04-15-05
10-05-18 08:09 PM - Post#2747949    
    In response to gofastwclass

I've seen some that use a 10 gauge wire, but for most coil in cap HEI's that are in good (wow, that is a comedic statement) condition, the 12 gauge wire will work the system.

The biggest problem ISN'T the HEI module, as one can see from the gauge of the red wire from the BATT buss bar on the cap, down to the module. If we look at the buss bars in the cap from the coil, they are significantly more beefy than the module power wire to run the nuclear hot temperature epoxy coil in the cap.



 
YOUNG57 
Frequent Contributor
Posts: 1068

Loc: Tennessee
Reg: 12-06-10
10-06-18 07:29 AM - Post#2747982    
    In response to IgnitionMan

The easiest and simplest solution is to replace the existing wire with a 12 AWG wire along the same route and to the SAME terminals, i.e. terminal on the HEI cap to the terminal on the back of the ignition switch (or wherever).



 
IgnitionMan 
Valued Contributor
Posts: 3430

Reg: 04-15-05
10-06-18 05:44 PM - Post#2748004    
    In response to YOUNG57

Usually, when the IGN terminal is hot in both start and run, THAT is the easiest way to do it. This from doing it that way for over 40 years.

Not to say it is the only, or best way, but it has never failed, is easy to do, and doesn't change any wiring, you can leave the resisted wire in the car if you need to go back to a resisted system for any reason, just tape that gircuit off and tuck it into the over engine wiring loom, add the full voltage wire from the IN terminal, millions done that way by everyone in creation, and, the known universe, NO problem.



 
MoboMac 
Contributor
Posts: 363
MoboMac
Reg: 08-22-11
10-06-18 08:51 PM - Post#2748019    
    In response to IgnitionMan

Thanks for everybodys input....

I will install the new heavier gauge wire....and report back....

formerly Cameo Coral.....now appearing as MoboMac

Franks 59....

http://www.youtube.com/watch?v=UokRArv4eSo

This car and vid is ART!

Turn it up & go full screen....


 
kingkreeton 
"5th Year" Silver Supporting Member
Posts: 1169
kingkreeton
Loc: Houston TX
Reg: 04-15-11
10-07-18 06:39 AM - Post#2748038    
    In response to MoboMac

They guys at American Auto-wire told me to use a 12 gauge wire for the ignition wire when I did my conversion.

Shane
64 Impala SS: 350 4 speed

"Let's go Reds"


 




Icon Legend Permissions Topic Options
Report Post

Quote Post

Quick Reply

Print Topic

Email Topic

392 Views
FusionBB
FusionBB™ Version 2.1
©2003-2006 InteractivePHP, Inc.
Execution time: 0.408 seconds.   Total Queries: 16   Zlib Compression is on.
All times are (GMT -0800) Pacific. Current time is 05:02 PM
Top