Posted by AG in IN on February 29, 2012 at 18:15:28 from (67.236.113.222):
In Reply to: Modern spark plugs posted by Ollie Oliver on February 29, 2012 at 07:11:59:
Texasmark1 said: (quoted from post at 00:34:45 03/01/12) Not so on your remarks in your first paragraph where I quit
reading.
One slight example, how long did it take Detroit to remove the
points from auto ignitions and put in a solid state switch; ala
Capacitor Discharge Ignition? Probably about 10-15 years after
you and I could go to JC Whitney and get one for our cars. The
list just goes on.
I have installed SS ignitions with the HV coils in some old gasser
tractors and every one of them had a significant improvement in
functionality, especially with smooth firing of the plugs and
ignition problems associated with points getting a glaze on them
while sitting up in the barn for 6 months kind of thing. I
installed them in my stuff and did so for some neighbors,
before I saw the light and just ran with diesel.
On the resistor in spark plugs, as mentioned, they had them
back in the 50's because ignitions interfered with radio's. Now
that there are microchip ignition systems, they are necessary to
keep the plug firings from interfering with the generation of the
spark. I just got off the phone, not 30 minutes ago with a Tech
Service guy working for NGK with a question about my OB
engine. He asked me some question, no if and or butts, no
stuttering, told me that my problem was that my spark plug
didn't have a Z in the part number which is a coil (inductor) in
the plug to keep the firing of the plug from confusing the
ignition system. Being the plug fires at 40,000 volts, and the
igintion system has 3v micro chips in it, it stands to reason.
Besides, I made my (comfortable) living for about 45 years in
that arena (high voltage discharge and small signal circuits to
control it) and he was right on.
Mark
I like reading entire posts. I always try to learn something.
Glaze and oxidation suck, but they are realities. The commonly available electronic ignition that I've seen for these engines prolongs the inevitible as that crap still builds up on/in the cap.
My 656 I had for over a decade took only proper plugs, an occasional tuneup with good ignition parts and proper timing, a valve job and properly set valves and service of the heat riser to run just fine until I sold it. From -10 to 90+ degrees, it only took warming up the engine for a few minutes for it to run right. Side curtains in winter did help. My 460 utility that I still have runs just fine too. It has a 50+ year old coil. Dad had 3 715's that never needed electronic ignition and high voltage coils, either. They could have used some of JC Whitney's magic fuel magnetizers to conserve gasoline, though. I've got a half-dozen 4-cyl IH gas engine tractors with battery ignition that function quite well with regular coils, correct plugs, and quality ignition parts.
Most C-221 to C-301 6 cylinder IH gas engines run best once some heat is built up in them. The water temp. doesn't have to be boiling either if the manifold heat riser is working properly. If plugs are fouling, one may also have bad/cracked or improper plug wires, oxidation on/in cap, rotor, and or points, worn or broken rings (if oil fouled), bad or improperly adjusted valve(s), an improperly adjusted carburetor or one in need of repair, improper timing, improper heat range of plugs, air leakage from a manifold problem, manifold gasket, or carb mounting gasket, clogged air cleaner, choke stuck or cable improperly set, or the possibility of a dozen or so other problems that I'm sure I forgot to list or a combination of any of the above. Electronic ignition with a high voltage coil sends more juice to fire the engine. It does remedy the problems caused by the parts it replaces. It will also cover up some problems like a slightly out of adjustment carburetor. A screwdriver usually fixes it.
YOU can go ahead and put any coil, plugs, and ignition set up on any tractor YOU want. It's a free country. If it works for you, I'm thrilled for you. If people don't ever bring their tractor to operating temperature, or are unwilling to do thirty seconds of work before starting a tractor every six months, electronic ignition is probably the way for them to go. Electronic ignition and/or a high voltage coil is not a necessity for these engines to perform properly.
AG
This post was edited by AG in IN at 18:50:21 02/29/12 4 times.
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