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  #1 (permalink)  
Old 07 Aug 2007, 06:51 am
TE Chea
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Default SM4 has cheapo resistors used to cut voltage to injectors

Mine have resistance of 5.6 ohm, injectors - 2.1 ohm, ratio is
8 : 3, when max 12.9v flows through both, # of watts wasted as
heat is 12.9² ÷ ( 5.6 + 2.1 ) x 8 ÷11 = 15.71w.
http://www.autozone.com/servlet/UiBr...3d800cf24b.jsp
A buck*converter ( costlier but far more efficient )
http://en.wikipedia.org/wiki/Buck_converter should have been
used instead ( as used on pc's mboard, for cpu ). Tandy's 1984
catalogue already had 2 * ( part # 14-844 & 270-1560 ) for sale
.. If fitted with ECU in boot, a * will not get too much heat, i.e.
will last long ( like those on mboards ).
Battery & spark plugs will get more amperes : easier start, less
sulfation of battery ( from higher charge ), less exhaust noise (
from bigger sparks ), more torque & mpg.

SM4's short 4-1 exhaust manifold & steel wheels are cheapos
too.


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  #2 (permalink)  
Old 07 Aug 2007, 07:34 am
jim beam
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Default Re: SM4 has cheapo resistors used to cut voltage to injectors

TE Chea wrote:
> Mine have resistance of 5.6 ohm, injectors - 2.1 ohm, ratio is
> 8 : 3, when max 12.9v flows through both, # of watts wasted as
> heat is 12.9² ÷ ( 5.6 + 2.1 ) x 8 ÷11 = 15.71w.
> http://www.autozone.com/servlet/UiBr...3d800cf24b.jsp
> A buck*converter ( costlier but far more efficient )
> http://en.wikipedia.org/wiki/Buck_converter should have been
> used instead ( as used on pc's mboard, for cpu ). Tandy's 1984
> catalogue already had 2 * ( part # 14-844 & 270-1560 ) for sale
> . If fitted with ECU in boot, a * will not get too much heat, i.e.
> will last long ( like those on mboards ).
> Battery & spark plugs will get more amperes : easier start, less
> sulfation of battery ( from higher charge ), less exhaust noise (
> from bigger sparks ), more torque & mpg.
>
> SM4's short 4-1 exhaust manifold & steel wheels are cheapos
> too.
>
>


you're out of your mind chea. go see your doctor.
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  #3 (permalink)  
Old 07 Aug 2007, 12:16 pm
Michael Pardee
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Default Re: SM4 has cheapo resistors used to cut voltage to injectors

"TE Chea" <4ws@gmail.com> wrote in message news:46b85ddf_1@news.tm.net.my...
> Mine have resistance of 5.6 ohm, injectors - 2.1 ohm, ratio is
> 8 : 3, when max 12.9v flows through both, # of watts wasted as
> heat is 12.9² ÷ ( 5.6 + 2.1 ) x 8 ÷11 = 15.71w.
> http://www.autozone.com/servlet/UiBr...3d800cf24b.jsp
> A buck*converter ( costlier but far more efficient )
> http://en.wikipedia.org/wiki/Buck_converter should have been
> used instead ( as used on pc's mboard, for cpu ). Tandy's 1984
> catalogue already had 2 * ( part # 14-844 & 270-1560 ) for sale
> . If fitted with ECU in boot, a * will not get too much heat, i.e.
> will last long ( like those on mboards ).
> Battery & spark plugs will get more amperes : easier start, less
> sulfation of battery ( from higher charge ), less exhaust noise (
> from bigger sparks ), more torque & mpg.
>
> SM4's short 4-1 exhaust manifold & steel wheels are cheapos
> too.
>
>
>

Resistors are the best way to go. The power dissipation is variable but is
always much less than your calculations because the injectors are energized
a small part of the time (low duty cycle.) Same with the power consumption;
if the duty cycle is 5% the total average power is around a watt.

The resistors don't produce a constant voltage on the injectors, but serve
as ballast instead. The injectors are very inductive so the full 12 volts is
initially applied across the injector. As the injector current builds up and
the injector is just being held open more voltage is dropped across the
resistor to prevent cooking the injector. I don't know of any manufacturer
that uses anything other than resistors when using ballasted injectors.

Mike



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  #4 (permalink)  
Old 10 Aug 2007, 12:08 am
Gene S. Berkowitz
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Default Re: SM4 has cheapo resistors used to cut voltage to injectors

In article <46b85ddf_1@news.tm.net.my>, 4ws@gmail.com says...
> Mine have resistance of 5.6 ohm, injectors - 2.1 ohm, ratio is
> 8 : 3, when max 12.9v flows through both, # of watts wasted as
> heat is 12.9² ÷ ( 5.6 + 2.1 ) x 8 ÷11 = 15.71w.
> http://www.autozone.com/servlet/UiBr...3d800cf24b.jsp
> A buck*converter ( costlier but far more efficient )
> http://en.wikipedia.org/wiki/Buck_converter should have been
> used instead ( as used on pc's mboard, for cpu ). Tandy's 1984
> catalogue already had 2 * ( part # 14-844 & 270-1560 ) for sale
> . If fitted with ECU in boot, a * will not get too much heat, i.e.
> will last long ( like those on mboards ).
> Battery & spark plugs will get more amperes : easier start, less
> sulfation of battery ( from higher charge ), less exhaust noise (
> from bigger sparks ), more torque & mpg.
>
> SM4's short 4-1 exhaust manifold & steel wheels are cheapos
> too.


Pardon me, but a buck converter isn't quite a simple in real life, as
opposed to Wikipedia. A high power buck converter requires a bunch of
passives (resistors, capacitors, and inductors), and is not cheap,
especially in automotive temperature grades.
They're also NOT instantaneous in operation, and don't like to have
their supply turned on & off thousands of times per minute.
They also dissipate heat (they're "bucking" the incoming power supply),
which needs to go somewhere.

Why don't you just switch to a carburated engine, like an '89 Ford
Fiesta, to go along with your '84 Radio Shack catalog? They don't need
those power-robbing fuel injectors anyway...

--Gene
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  #5 (permalink)  
Old 10 Aug 2007, 03:59 pm
Gordon McGrew
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Default Re: SM4 has cheapo resistors used to cut voltage to injectors

On Tue, 7 Aug 2007 10:16:07 -0700, "Michael Pardee"
<michaeltnull@cybertrails.com> wrote:

>"TE Chea" <4ws@gmail.com> wrote in message news:46b85ddf_1@news.tm.net.my...
>> Mine have resistance of 5.6 ohm, injectors - 2.1 ohm, ratio is
>> 8 : 3, when max 12.9v flows through both, # of watts wasted as
>> heat is 12.9² ÷ ( 5.6 + 2.1 ) x 8 ÷11 = 15.71w.
>> http://www.autozone.com/servlet/UiBr...3d800cf24b.jsp
>> A buck*converter ( costlier but far more efficient )
>> http://en.wikipedia.org/wiki/Buck_converter should have been
>> used instead ( as used on pc's mboard, for cpu ). Tandy's 1984
>> catalogue already had 2 * ( part # 14-844 & 270-1560 ) for sale
>> . If fitted with ECU in boot, a * will not get too much heat, i.e.
>> will last long ( like those on mboards ).
>> Battery & spark plugs will get more amperes : easier start, less
>> sulfation of battery ( from higher charge ), less exhaust noise (
>> from bigger sparks ), more torque & mpg.
>>
>> SM4's short 4-1 exhaust manifold & steel wheels are cheapos
>> too.
>>
>>
>>

>Resistors are the best way to go. The power dissipation is variable but is
>always much less than your calculations because the injectors are energized
>a small part of the time (low duty cycle.) Same with the power consumption;
>if the duty cycle is 5% the total average power is around a watt.


You have to understand that the Chia Pet's feelings about watts are
like General Jack D. Ripper's feelings about precious bodily fluids.
To waste them is a sin even if they are abundant. Chia will not have
an electric clock in his car. He claims that they stress the
electrical system, but I think he just can't sleep at night with the
thought of the constant, unrelenting drip-drip-drip of milliamp after
milliamp being lost forever.


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  #6 (permalink)  
Old 06 Sep 2007, 10:01 am
TE Chea
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Posts: n/a
Default salesman bluffing ( Re: SM4 has cheapo resistors used to cut voltage to injectors )

| a buck converter isn't quite a simple in real life, as
| opposed to Wikipedia.
Wiki 's pages are written by PhD`s, you have a PhD in
electronics ?

| is not cheap
Here, 1 can buy a new 3½ amp b-c for M$55 =~US$15.71, who
in this NG cannot afford this ?

| especially in automotive temperature grades.
no need to fit under bonnet, twit

| They're also NOT instantaneous in operation, and don't like to have
| their supply turned on & off thousands of times per minute.
Bullshit & irrelevant ; F20A's injectors® get a +ve voltage
whenever ignition switch is on, ECU controls ®' -ve ground.
http://www.autozone.com/images/cds/g...3d800d0ddd.gif
I already can replace F20A's resistors,
http://www.autozone.com/servlet/UiBr...3d800d087c.jsp
with lithium battery(s), a b-c as a charger, & diodes. Trial result
is good : noise, alternator & engine's heat, idle rpm, all
dropped ~30%, battery's charge rose >10% www.batteryfaq.org .

| They also dissipate heat (they're "bucking" the incoming power supply),
| which needs to go somewhere.
How much heat does a pc mboard's*b-c produce ? * processes
10-20x as many amps yet heat cannot even be felt by hand.

| Why don't you just switch to a carburated engine
No 4ws. Incredible is how thick-skin salesmen & women are in
these NG`s.


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  #7 (permalink)  
Old 08 Sep 2007, 10:17 am
Gene S. Berkowitz
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Default Re: salesman bluffing ( Re: SM4 has cheapo resistors used to cut voltage to injectors )

In article <46e01c05_1@news.tm.net.my>, 4ws@gmail.com says...
> | a buck converter isn't quite a simple in real life, as
> | opposed to Wikipedia.
> Wiki 's pages are written by PhD`s, you have a PhD in
> electronics ?


HA HA HA HA HA HA!
That's the funniest thing I've read in WEEKS!

--Gene



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