coil

hope

hope

Senior Member
Thanks all for the help.

Trying again to post some pictures of coil readings, (that's got me confused).


Will have to go back and read all the suggestions, because i forgot:o.



Seems to me that the coil gets soo hot (would almost burn to the touch), that its more heat than from the engine?


Its 12 volts system, with in line resistor of 1.4 ohms to + side of coil.


Hope those pictures show-up, because i cannot explain those resistance reading. They seem to fluctuate with different settings on the meter.


Hope:confused:
 
hope said:
Its 12 volts system, with in line resistor of 1.4 ohms to + side of coil.
Hope:confused:
Click to expand...

Well the setup sound right. The reading will change with a scale change. You want to check between the two small terminals, the + and - on the lowest scale. The scale needs to be in the same range as what you are checking, so something in the 0.6 to 2.0 range. If you check it on a higher scale it is a very small percentage of the scaling and hard to get a good reading. If it is digital, it may be auto ranging.
 
I'm going to relocate this coil, and see what happens.


I took a couple of pictures of the readings on my meter, of the original coil and it doesn't look like its what i need. side posts 02.5 side post to middle 13.2

Ive got another new one in there now, but i don't know what reading its got.


I'm going to try again to post the pictures , later.:mad:%&^$#.


Hope.
 
hope said:
O.K. BUBBA THANKS.

What should i look for? Hope;)
Click to expand...

You can't check resistance with the engine running, that is for voltage checks. Hope, running two threads on the same topic is making this very confusing. Need to close one of them and stick with the other.
 
Actually voltage is what he should be checking . With the engine running ground meter set on voltage scale , then go from one terminal to the next checking the voltage reading this will give you a working voltage drop in relationship with ressitance .

Starting at the battery ( 12-13 volts running) then move lead to ignition switch connection and check again ( .005 volts is good drop for switch) then on to resistor feed ( again very small drop maybe .015) then out put of resistor ( approx 6.00 volts ) then feed to coil ( 6.05 etc ) then neg on coil ( 12 volts etc ) ........If ya add up the readings they must equal battery volts at start of test plus or minus a hundreth or two....
Those off shore high resistance coils chrome plated do get really hot as they have 2-3 ohms resistance built in . Work better with a four cylinder than a V8. Try the tests above and write down the readings be glad to help , we all need a lesson n voltage drop or two....
 
JSeery said:
You can't check resistance with the engine running, that is for voltage checks. Hope, running two threads on the same topic is making this very confusing. Need to close one of them and stick with the other.
Click to expand...
The reason of the two threads, is because i've had soooo mutch trouble to post a picture, that's the only way i could do it.:(


Hope
 
Not sure I understand what two (actually three) threads on the same topic has to do with posting photos? It is just confusing things.
 
hope said:
The reason of the two threads, is because i've had soooo mutch trouble to post a picture, that's the only way i could do it.:(


Hope
Click to expand...

I find with posting pictures you need to reduce the file size in order to post. Probably easier on a computer but on my phone it's easiest to email them to myself as the email gives me the readily available option to resize images. Not sure how the guys are able to post pictures directly in the thread without it being a thumbnail attachment tho.

Will
 
Bubba, if the coil has a built in 3 ohm resistance, couldn't it run w/o a external resistor @ 12V?
 
Will D said:
I'm not sure how the guys are able to post pictures directly in the thread without it being a thumbnail attachment tho.
Will
Click to expand...


Hey Will.....As you probably realize, when you click on MOST "posted" thumbnails, they increase in size to what I believe is a size that you are referring to. My experience is that when I post a picture that is stored on MY computer, it posts as a thumbnail. If I want to post it as a larger picture, it must first be posted ANYWHERE on the internet, like on a hosting site, or even in one of your albums here on the FordBarn, for instance. I know that I can click on MOST any thumbnail that is posted here on the FordBarn, which most times increases it size. What's important here is now that that picture IS posted SOMEWHERE on the internet, it has been assigned it's own distinct URL (identifier on the internet). This entire process below only takes about 5-7 seconds per picture once you get used to doing it. So, what I do is click on a thumbnail to increase it's size (like I've done with a thumbnail Kube posted on another thread of a green '39 Ford underhood. With it now appearing enlarged, I place my cursor on the enlarged photo. Right-click and a window drops down. I left-click on "PROPERTIES". That picture's complete URL appears, beginning with a "https//www.…". I carefully blue-highlite and then copy that COMPLETE URL. Wherever I wish to place the enlarged picture in my post, I mark the spot with my cursor and left-click. I then left-click on that little yellow, square icon up above with the two tiny mountains(
insertimage.gif
). A small window opens. Place your cursor on the BLANK line, left-click on the blank line to mark the spot, right-click on the blank line and a window drops down. Left-click on "PASTE". One last step...left-click on OK! Your full-size picture is now posted!! Kube's enlarged picture (from his thumbnail) below. DD


PS....You know where this one came from!


428940



428787
 
Last edited:
frnkeore said:
Bubba, if the coil has a built in 3 ohm resistance, couldn't it run w/o a external resistor @ 12V?
Click to expand...

Yes shouldn’t need a resistor , I would expect a misfire with the resistor at higher rpm off idle ???!
Although we have used a Beru or Bosch coil the most I like the concept of a 1.5 ohm coil and a 1.5 Ohm resistor the very best. Divides the wattage and the heat .!!!!
 
Bringing in a resistor of 1.5 ohm is like going back to a 6v system...half the energy burned away in the resistor for no good reason...
Energy in coil is voltage*current.
Do it fire on half...sure...will the extended burn time in the plugs be needed...not likely..
But i rather have the energy clean my plugs then heat a resistor...
 
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