full thottle switch - how ammeters work

[jdbubb at ix.netcom.com (Dan Bubb)]

Actually, the Bentley primarily refers to duty cycle and the recommended
setting is 50%.
How this corresponds to Dwell depends on the setting of the dwell meter.
If the dwell meter is set for a 4 cylinder engine then 100% duty cycle
corresponds to 90 deg dwell
If the dwell meter is set for a 6 cylinder engine then 100% duty cycle
corresponds to 60 deg dwell
If the dwell meter is set for a 8 cylinder engine then 100% duty cycle
corresponds to 45 deg dwell

It's easiest to set the meter for a 4 cylinder then the duty cycle and dwell
are almost the same.

I'd be willing to bet you could set the mixture using a volt meter, but I'd
think the characteristics of the voltmeter (capcitance, inductance,
resistance) would alter the reading for a given dwell. (please attack me
viciously if I'm wrong!)

So, when are we going to discuss how changing duty cycle/dwell effects
engine performance????
Dan

----- Original Message -----
From: "Euroroc II" <flaatr@yahoo.com>
To: <scirocco-l@scirocco.org>
Sent: Tuesday, September 23, 2003 2:11 PM
Subject: RE: full thottle switch - how ammeters work


> Almost afraid to get into this but Dwell is a measurement of Duty Cycle
(On
> time vs. Off time) but on a slightly different scale... 0% dwell or Duty
> Cycle is always off... 100% Duty Cycle is always on and is measured as 60
> Degrees... 50% Duty Cycle is half time on and half off and is read as 30
> Degrees. It can be measured as current or you can also get very accurate
> measurements measuring voltage... depends on the meter you own. The
> ultimate measurement is neither volts or amps, mA or mV if that's more
> comfortable, but a measurement of percent time.
>
> If you have a Fluke or other meter that reads Duty Cycle... just convert
> your dwell numbers to duty cycle.
>
> -Raffi
>
>
> At 12:16 PM 9/23/2003 -0500, ATS - Patrick Bureau wrote:
> >I am sorry if my email offended, it was not ment that way.
> >
> >well I have ordered a new multimeter that will do Dwell, so that will
solve
> >the problem, but now I am confused, if dwell is not mA nor mV , then why
> >everyone talks about a mA reading on the test lead or am I so dense that
I
> >am mixing up things together and doing a process of self confusion and in
> >annoyance by everyone with my dumb ass questions..
> >
> >
> >ATS - Patrick Bureau - txrocco@sbcglobal.net
> >----------------------------------------------
> >MSN:ATSGTX@hotmail.com |YAHOO:ATSGTX@yahoo.com
> >ICQ:32918816           |AIM:Texasscirocco
> >----------------------------------------------
> >
> >
> >=>-----Original Message-----
> >=>From: Dan Bubb [mailto:jdbubb@ix.netcom.com]
> >=>Sent: Tuesday, September 23, 2003 9:08 AM
> >=>To: ATS - Patrick Bureau; T. Reed
> >=>Cc: Allyn; scirocco-l@scirocco.org; L F
> >=>Subject: Re: full thottle switch - how ammeters work
> >=>
> >=>
> >=>Dwell is NEITHER mA or mV.
> >=>I'm not a hotshit electrical engineer and don't know anything
> >=>about ammeters
> >=>and voltmeters, but I do know that you need to measure dwell on
> >=>your car and
> >=>you need a dwell meter to do it!
> >=>Get a dwell meter. Something that has a scale on it that says "dwell"!
> >=>Then we can quibble about what the setting should be and how much
> >=>it doesn't
> >=>effect the power your engine makes!
> >=>Dan
> >=>
> >=>
> >=>----- Original Message -----
> >=>
> >
> >
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>
>
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