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Thx Fredrick,
I just did this test and here are the
results. I disconnected both leads to the ballast and the postitive lead
to the coil. I then ran a jumper from battery +12v to one side of the
ballast. I then hooked the other end of the ballast to the positive of the coil
essentioally completlely bypassing all of the coil/ballast circuit.
I tried this with the original ballast and a then
new one. Guess what? I get the same reading at idle, 10-11 volts and 12v at
higher RPM at the COIL. This must be normal and I'm barking up the wrong
tree.
I'm going back to a possible fuel problem. I'd
appreciate any thoughts.
Chris 67 Imperial Convertible
----- Original Message -----
Sent: Wednesday, December 27, 2006 9:00
PM
Subject: Re: Fw: IML: Carter AFB running
Question
The job of the ballast resistor is to vary the voltage that the coil gets
so that it does not over heat and fail. The coil needs more power (voltage in
this case) at higher RPM when it is firing more sparks per minute and
less voltage at lower RPM. My understanding is the the coil will get
about 6 volts through the ballast resistor at idle and more at
higher RPM.
During the starting process the coil is by-passed so it sees the entire
voltage from the battery. Too high a voltage at the coil could be a bad
ballast resistor (as you appear to have) or a short in the by-passing
circuit.
The 45K volt coil that I have uses a much lower resistance ballast
resistor than stock, presumably because it requires more power to get to the
higher (45K) voltage.
I do not know how old your coil is, but when I run into situations
like this I like to change out all of the "wear" parts which would include the
ballast resistor, coil, condensor etc.
-----
Original Message -----
From: "Chris Strohmeyer"
To: mailing-list@xxxxxxxxxxxxxxxx
Subject:
Fw: IML: Carter AFB running Question
Date: Wed, 27 Dec 2006 15:16:41
-0800
Look below, Can too much voltage to the coil be making it
run erratically?
Chris
----- Original Message ----- From: "Chris
Strohmeyer"
To:
Sent: Tuesday, December 26, 2006 6:34
PM
Subject: Re: IML: Carter AFB running Question
> I may
have found part of the problem. I
> checked the vacuum and its around
15 which is
> fine.
> But, I checked the voltage at the coil
while
> it's running and it's at 12 v. Should be 6v
> right?
So I checked it at the ballast
> resistor and it's 12v on one side
and 13.5 on
> the other. I think the ballast is
wasted?
>
> Your thoughts?
> Chris
> ----- Original
Message ----- From: "D. Howland"
> To:
> Sent: Tuesday, December 26, 2006
1:30 PM
> Subject: Re: IML: Carter AFB running
Question
>
>
>> Have you tried this:
>> Run it
at 2500 rpm. Close the choke plate
>> (or block what you believe
to be the
>> offending venturi(s)) with your hand. Does
>> it get better? If you have a fuel starvation
>> issue
and you block a bunch of air, it
>> should smooth out as the
mixture improves.
>>
>> I'm not sure what the fuel is
supposed to
>> look like at that rpm as I'm somewhat timid
>> about sticking my face over a poor running
>> carb at
much more than idle. I like my
>> eyebrows
intact.
>>
>> Daryl
>> ----- Original Message
----- From: "Chris
>> Strohmeyer"
>> To:
>> Sent: Tuesday, December 26, 2006
1:04 PM
>> Subject: IML: Carter AFB running Question/2
>>
Budd calipers on the way
fr.calipersonline
>>
>>
>>> Hi again
experts,
>>>
>>> I'm having a running problem that I
still
>>> think is carburetion. It only idles ok,
>>> and runs erratically at say 2500 rpm.
>>> This
is what I've done so far:
>>> Changed distributor, cap,rotor,
wires and
>>> plugs. Also have tested it with another
>>> coil-same results. I've checked voltage to
>>>
the coil too.
>>> I've checked the compression cold and get
>>> 125 per cylinder across the board. The
>>>
engine has about 30 k on it.
>>> I've also sprayed/checked for
vacuum leaks, it seems solid.
>>> I have personally rebuilt the
carb with a
>>> kit and have had the top off once to check
>>> to if the float level was ok..etc.
>>> What I'm
suspicious of the way the fuel
>>> looks going down the primary
at a steady
>>> 2500 rpm. It sort of drools unevenly in
>>> both venturis. The "sucking" sound it
>>>
makes is not uniform. I thought instead of
>>> slurping or
drooling in, it should look
>>> more like a vapor going
in.
>>> When I shut it off and look down the carb
>>> it stays dry like the float level isn't too
>>> high.
>>> I rebuilt the carb first because it
ran
>>> this way before I did all this stuff. This
>>> still "feels" like a fuel problem. If I
>>>
had a spare good carb, that would certainly
>>> prove
it.
>>>
>>> Any thoughts?
>>>
Thx,
>>> Chris
>>> 67 Imperial
Convertible
>>> ----- Original Message ----- From: "Kenyon
>>> Wills"
>>> To:
>>> Sent: Tuesday, December 26,
2006 10:36 AM
>>> Subject: IML: 1967-69 Budd Calipers available
soon
>>>
>>>
>>
>>
>>
>>
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>
>
>
>
----------------- http://www.imperialclub.com -----------------
> This
message was sent to you by the Imperial
> Mailing List. Please reply
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> response will be
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