Coil Resistor? |
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Jus*Jack
Member Joined: 15 Mar. 2007 Location: so. Georgia Status: Offline Points: 1841 |
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Hmmm...and this "anonymous teenager" grew up to be....? <g>
Yep...as you said..."Measure twice...cut once!" |
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Seeya!
<Jack> '48 CJ2A 197207 "Junebug" '48 CJ2A 191237 "Turquoise" |
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samcj2a
Member Sponsor Member x 5 Joined: 21 Oct. 2006 Location: Arlington, VA Status: Offline Points: 8549 |
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46CJ2A
Member Joined: 06 Feb. 2007 Location: Hartsville, SC Status: Offline Points: 144 |
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I did put a socket on the crankshaft nut and turn the engine over a few times. It turned over okay, but a bit more snug than some of the other types of car/motorcycle engines I've rebuilt over the years.
I'd still like to carefully try the 12 volt coil and battery set up if someone could give me that coil part number.
Thanks.
Jack
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1949 CJ3A
1951 M38 |
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samcj2a
Member Sponsor Member x 5 Joined: 21 Oct. 2006 Location: Arlington, VA Status: Offline Points: 8549 |
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I would go to Advance Auto or a similar place and buy the cheapest coil and coil resistor for something like a 1955 Pontiac. That car and many other of that era had a coil and external resistor combination that will work fine with a 2A and a 12 volt battery. Looking at their Web site, you should be out of there for around $25. I know that you wanted a coil with resisitor included, but I think you will find the other combination more commonly available. Then just wire the resistor in series with the battery connection to the coil. |
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cjric
Member Joined: 03 Dec. 2007 Location: michigan Status: Offline Points: 148 |
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did you spin the oil pump and make sure there's oil throughout the engine? I always do that after putting a motor back together, because I was told to. Once though, I forget (on a Ford 300-6), and the starter would only turn once until compression built, then it couldnt turn the motor. Pulled the dist., spun the oil pump w/ a homemade chuck on a drill, put it back together and the starter spun full speed andthe motor fired right up.
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bkreutz
Member Sponsor Member Joined: 17 Oct. 2006 Location: Fruitland Idaho Status: Offline Points: 7037 |
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Unfortunately the spinning up of the oil pump is not possible on these engines, the pump drive is keyed to the camshaft and the distributor plugs into the oil pump, kinda reversed from what most of us are normally used to on more modern engines.
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Jus*Jack
Member Joined: 15 Mar. 2007 Location: so. Georgia Status: Offline Points: 1841 |
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There IS a thread around here however, that addresses the PRIMING of the oil pump, I believe...but don't ask me t' find it! <g>
IF the pump was removed, then that would be a necessary step, yes? But this may be something entirely different. Have you pulled the plugs and tried turning it over by hand or starter? |
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Seeya!
<Jack> '48 CJ2A 197207 "Junebug" '48 CJ2A 191237 "Turquoise" |
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GaryArf
Member Sponsor Member Joined: 21 July 2005 Location: Baxter MN Status: Offline Points: 3905 |
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This is along way from the original post question, but since you asked and I found it...
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CJ2A #10021 #34692 #58500
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samcj2a
Member Sponsor Member x 5 Joined: 21 Oct. 2006 Location: Arlington, VA Status: Offline Points: 8549 |
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I second Jack's idea of cranking it without the plugs just to be sure that something isn't too tight. Of course, you know where my bias originated!
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46CJ2A
Member Joined: 06 Feb. 2007 Location: Hartsville, SC Status: Offline Points: 144 |
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In the morning I'll trying turning it over without the plugs.
I was still hoping someone might have that 12 volt coil number though.
If not, I guess I'll try the '55 Pontiac idea. Was that a 6 volt coil with a 30 watt, 1.0 - 1.1 ohm resistor?
Jack
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1949 CJ3A
1951 M38 |
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westforkboyd
Member Sponsor Member Joined: 07 Sep. 2006 Location: Northern Iowa Status: Offline Points: 3514 |
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Jack you must have missed Roc's post but here it is again.
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'48 CJ-2A #184135 Lefty
'49 CJ-2A #219719 Mule '39 Ford 9N '55 Oliver Super 55 Ollybelle |
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rocnroll
Member Sponsor Member Joined: 20 July 2005 Location: Tuscumbia, AL Status: Offline Points: 13606 |
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........or just go back and reread page two of this thread.
Hey Allen, you know you can go back in and erase that don't you? (click on edit post)
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'47 CJ2A PU
'48 CJ2A Lefty "Common sense is not that common" |
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46CJ2A
Member Joined: 06 Feb. 2007 Location: Hartsville, SC Status: Offline Points: 144 |
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Yah, I did miss it. I saw the Mallory resistor but not the coil.
Thanks.
Jack
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1949 CJ3A
1951 M38 |
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sean
Moderator Group Sponsor Member Joined: 20 July 2005 Location: North Idaho Status: Offline Points: 7388 |
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Jack:
Simplest might be to use a 12v setup from later model Williys: Autolite original part numbers (have them cross-referenced):
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samcj2a
Member Sponsor Member x 5 Joined: 21 Oct. 2006 Location: Arlington, VA Status: Offline Points: 8549 |
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My opinion is that almost any 12 volt coil with a matched internal resistor or any 6 volt coil with a roughly matched external resistor would work. If the internal resistance of the 6 volt coil is 1.1 to 1.5 ohms, any resistor with close to the same resistance should work for this purpose as long as the resistor is equal to or slightly less than the coil resistance, right? You just want to drop the voltage in approximately half so you don't burn up the the coil primary windings. If these things work with 8 volt batteries, then close is okay as long as you don't have an external resistor with greater resistance than the coil resistance and th voltage at the coil goes below 6 volts. It probably still works if you are close, but who knows what the lower threshold is get a decent spark. Is that a reasonable way to look at it, Sean?
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sean
Moderator Group Sponsor Member Joined: 20 July 2005 Location: North Idaho Status: Offline Points: 7388 |
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2 equal resistances will precisely divide the applied voltage. Unequal resistances will divide the voltage in proportion to their resistance ratios. eg, w/12v applied , a 1.0 ohm resistor will see 5.7v, while the 1.1 ohm coil will see 6.3v Sean |
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Jus*Jack
Member Joined: 15 Mar. 2007 Location: so. Georgia Status: Offline Points: 1841 |
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While we're about it (calculating the resistance), anybody wanna take a shot at the wattage rating that the resistor should have? (That's usually the important issue with low-value resistors) Most that I have seen are the large ceramic "blocks", and are probably good to 5 or 10 watts (never actually looked), but I'm just curious...I happen to have some _very_ "flashy" gold-anodized resistors (with heat-sink fins) that I believe were surplus from some NASA projects in years past. Most are in the <5 ohm category, and I believe some even go as high as 10 watts! Pretty things, and it might be fun t' use one in my driver.
...and I'd bet that one would look really neat in Roc's CJ2APU! <g> |
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Seeya!
<Jack> '48 CJ2A 197207 "Junebug" '48 CJ2A 191237 "Turquoise" |
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samcj2a
Member Sponsor Member x 5 Joined: 21 Oct. 2006 Location: Arlington, VA Status: Offline Points: 8549 |
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Well, Jack, here are the formulas for DC applications which we have until the points open after whcih things get messier because the current is changing and, and ! Power = Current squared times Resistance or (I**2)*R Voltage = Current times Resistance or I*R
so Current = Voltage/Resistance or I = V/R
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