At a guess, the rev counter has been connected to one of the 2 coils on the
coil pack.
So it's only seeing half the sparks.
You need to connect it to the rev counter output on the ECU.
Tell me what the wiring loom and engine were from, car and year, and i should
be able to tell you what pin on the ecu it is.
Jim
From: Derek Clews
Sent: Monday, March 05, 2012 12:09 PM
To: quantumowners@googlegroups.com
Subject: Re: [Quantum Owners] Re: H4 Rev Counter
Jim,
My project Bronze Qoupe has a similar but different issue. Standard clocks
but now a 2L EFI engine fitted and it reads at half revs. Either that or is an
amazing engine.............! What do you recommend?
Derek
On 5 Mar 2012, at 09:20, Jim Hearne wrote:
But, wasn't yours a 2+2, hence Mk2 Fiesta instruments which expect 4 pulses
per engine rev, just as the Zetec ecu puts out.
It was the distributorless CVH engines (Mk3 Fiesta, Mk5 Escort) that for
some reason Ford decided to connect the rev counter to one of the coil wires
which since there are 2 coils only gives 2 pulse per rev.
They changed the CVH rev counters to match this.
Probably was done as the late carb'd CVH's with the distributorless
ignition didn't have a rev output from the ignition only ecu.
Then they carried that system onto the CVH injection.
When they did the Zetec they went back to normal but with a dedicated ouput
from the ECU, as this wasn't on a coil connection they could also do away with
the suppressor.
Jim
From: Mark Miles
Sent: Monday, March 05, 2012 9:13 AM
To: quantumown...@googlegroups..com
Subject: Re: [Quantum Owners] Re: H4 Rev Counter
I am now confused, when I did the transplant I used the cvh clocks with
the zetec ecu, All I did was connect the output from the ecu to the old coil
wire that fed the rev counter. This gives me the rev readings that I would
expect, idle at just below 1000 etc. Could this be something that varies with
the ecu type?
Mark
Mark Miles
Manager
Bar Square
8 Market Place
Wokingham
Berkshire
RG40 1AL
07565 110439
--------------------------------------------------------------------------
From: Jim Hearne <j...@quantums.info>
To: quantumowners@googlegroups.com
Sent: Monday, 5 March 2012, 9:02
Subject: Re: [Quantum Owners] Re: H4 Rev Counter
The CVH engine with the distributorless ignition drove the rev counter
from one of the 2 coils wires..
The Zetec runs it from a dedicated output from the ECU, if you connect
that to the CVH rev counter it will show twice the revs.
If you are still using the CVH main wiring and instrument cluster then
you can switch the rev counter connection back to one of the zetec coil
connections and it will work fine (keep the CVH suppressor in circuit).
What combination of wiring looms do you have now ?
Jim
--------------------------------------------------
From: "george" <pearcegeor...@hotmail.co.uk>
Sent: Monday, March 05, 2012 8:00 AM
To: "Quantum Owners Group" <quantumowners@googlegroups.com>
Subject: [Quantum Owners] Re: H4 Rev Counter
> Hi Jim
>
> The rev counter does not move but on test there is a reading and the
> meter reads the revs. Wondered if it was not compatible being CVH with
> Zetec brain...
>
> On Mar 4, 9:03 pm, Jim Hearne <j...@quantums.info> wrote:
>> What does the rev counter do ?
>>
>> Jim
>>
>> On 04/03/2012 18:59, george wrote:
>>
>>
>>
>>
>>
>>
>>
>> > I have installed a zetec blacktop in my H4 and all works fine except
>> > the rev counter. Tested the out pit from the ecu and it reads the
revs
>> > of the engine. Can anyone tell me if I need to get a newer rev
counter
>> > from an zetec car as mine was CVH could that be the reason its the
>> > only thing I can think..
>> > Any thoughts........
>
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