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: [email protected] 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 <[email protected]> To: [email protected] 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" <[email protected]> Sent: Monday, March 05, 2012 8:00 AM To: "Quantum Owners Group" <[email protected]> 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 <[email protected]> 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........ > > -- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to [email protected] > For more options, visit this group at http://groups.google.com/group/quantumowners?hl=en > > IMPORTANT NOTE: All information presented herewith is provided on an "As Is" basis, without warranty or the implication thereof. Neither the Quantum Owners Club nor the individuals associated with the Quantum Owners Club or in the preparation of the above information shall have any liability to any person or entity with respect to liability, loss, or damage caused or alleged to be caused directly or indirectly by the instructions contained within this or related message(s). > > -- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/quantumowners?hl=en IMPORTANT NOTE: All information presented herewith is provided on an "As Is" basis, without warranty or the implication thereof. Neither the Quantum Owners Club nor the individuals associated with the Quantum Owners Club or in the preparation of the above information shall have any liability to any person or entity with respect to liability, loss, or damage caused or alleged to be caused directly or indirectly by the instructions contained within this or related message(s). -- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/quantumowners?hl=en IMPORTANT NOTE: All information presented herewith is provided on an "As Is" basis, without warranty or the implication thereof. Neither the Quantum Owners Club nor the individuals associated with the Quantum Owners Club or in the preparation of the above information shall have any liability to any person or entity with respect to liability, loss, or damage caused or alleged to be caused directly or indirectly by the instructions contained within this or related message(s). -- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/quantumowners?hl=en IMPORTANT NOTE: All information presented herewith is provided on an "As Is" basis, without warranty or the implication thereof. Neither the Quantum Owners Club nor the individuals associated with the Quantum Owners Club or in the preparation of the above information shall have any liability to any person or entity with respect to liability, loss, or damage caused or alleged to be caused directly or indirectly by the instructions contained within this or related message(s).
