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Date: Mon, 19 Jul 2010 14:31:05 -0600
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Subject: EC2 Crank Sensor mounting question?
From: Mike Fontenot <mikef@apexconsultingservices.com>
To: flyrotary@lancaironline.net
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I have a question about mounting the Crank Position Sensors themselves. My
system is an EC2 computer on a GEO 1.3L engine with two crank sensors, one
for the A computer, and a separate one for the B computer.

Do you see a downside to having both the A and B crank position sensors
mounted on a bracket so that they BOTH are reading the same toothed wheel on
the engine crank pulley? Can the EC2 B computer run and adjust itself to
work if it is receiving the crank sensor signal coming from a differently
oriented crank sensor?

BACKGROUND: In my recent tuning efforts I have found that the 'B' crank
sensor teeth is causing the engine to run rough when going above 1800 RPM. I
have a small pulley that has replaced the stock GEO harmonic balancer. The
main pulley has the teeth cut into it for the A computer and A CPS to read.
There is also a secondary set of teeth specifically for the B CPS/B computer
backup combination. On the same shaft but closer to the engine.

1. A computer connected to A CPS, reading A teeth - smooth/OK
2. B computer connected to B CPS, reading A teeth - smooth/OK
3. A computer connected to A CPS, reading B teeth - rough as a cob
4. B computer connected to B CPS, reading B teeth - rough as a cob

My Sherlock-Holmes-ian deduction says the B teeth are out of spec and
contributing mightily to the engine roughness. And I am thinking: just
forget that second set of teeth and use the primary A/teeth for both sensors
(A & B).  But I wanted to check with more experienced folks before pursuing
something like this.

Thanks in advance,

Mike

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I have a question about mounting the Crank Position Sensors themselves.=20
My system is an EC2 computer on a GEO 1.3L engine with two crank sensors, o=
ne for the A computer, and a separate one for the B computer. <br><br>Do yo=
u see a downside to having both the A and B crank position sensors=20
mounted on a bracket so that they BOTH are reading the same toothed=20
wheel on the engine crank pulley? Can the EC2 B computer run and adjust its=
elf to work if it is receiving the crank sensor signal coming from a differ=
ently oriented crank sensor?<br>

<br>BACKGROUND: In my recent tuning efforts I have found that the &#39;B=
9;=20
crank sensor teeth is causing the engine to run=20
rough when going above 1800 RPM. I have a small pulley that=20
has replaced the stock GEO harmonic balancer. The main pulley has the
 teeth cut into it for the A computer and A CPS to read.=A0 There is also a=
 secondary set of teeth specifically for the B CPS/B computer
 backup combination. On the same shaft but closer to the engine.<br>

<br>1. A computer connected to A CPS, reading A teeth - smooth/OK<br>2. B
 computer connected to B CPS, reading A teeth - smooth/OK<br>3. A=20
computer connected to A CPS, reading B teeth - rough as a cob<br>4. B=20
computer connected to B CPS, reading B teeth - rough as a cob<br clear=3D"a=
ll">

<br>My Sherlock-Holmes-ian deduction says the B teeth are out of spec=20
and contributing mightily to the engine roughness. And I am thinking:=20
just forget that second set of teeth and use the primary A/teeth for=20
both sensors (A &amp; B).=A0 But I wanted to check with more experienced fo=
lks before=20
pursuing something like this.<br><br>Thanks in advance,<br clear=3D"all"><b=
r>Mike<br><br><br>

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