(T) Rev counter

I know there a probably a million threads asking this question but here goes - rev counters and 899 Cinqs. I have 2 questions
1 - Can you use a 2 cylinder bike rev counter?
2 - Failing that, I understand that a 4 cylinder rev counter will under read by exactly half. Is that right cos of the dual coil system? What I might do is buy an aftermarket 4 cyl counter off ebay or something (halfords do one but it states for single coil only - but I'd probably ignore that ) and change the numbers - change 1 for 2, 2 for 4 etc. and see if I can get a 5,000 rpm max one!

Cheers in advance

1. Should be able to, I've hooked a Sei rev counter up to a cinq and it reads half so the ecu must give out a standard type 4 cylinder signal.

2. Might read a bit jumpy, the sei one did.

Hi,
I've stripped some cinq sporting clocks down, and there should be a way of making it read double what its supposed to by changing some electronic components, so that it would read correct....if you know what I mean..
The circuit board inside has a few resistors, a capacitor and an ic control chip(pulse counter), the count should be controlled by the resistors I think..
Will have to investigate deeper I think....when I get some time

Thanks
Paul T

Paul, any scrapyards around by you? Where in South Wales are you?

Just thought of something - I could get an aftermarket tacho and make a dial face as described in one of the stickys, but every 500 rpm = 1000 actual rpm! Just need a 4/5000 rpm max rev counter (like off a 4 cyl lorry - I'll have to have a root around).

Hi,
Just outside Neath, there's not much in the scrappies at the mo, a 94 cinq 899cc in PickupSpares and a 95 899cc in Owens in Aberdare, plenty of uno's though...

Thanks
Paul T

Owens usually have a Cinq, I had to get a rear wiper arm after some little F****r (I have a good idea who) snapped my old one off. Is it a red cinq with mild frontal damage missing its rear wiper, to the right as you go into the yard?

Paul are you intending going to Max Power Live this year?

Hi,
Yeah I know, its also missing the the front nearside susp leg(on mine) and the centre front wiper support(soon to be on mine), which I had to hacksaw off in the rain, cos its allways raining there....
Where abouts you from then.....

Thanks
Paul T

I know what you mean about the rain, when I went there (last summer) the carpets were swimming and the wheels were on the back seat!

Hi,
Na not going to max power, getting a bit old now for that sort of thing....

Think max power just goes a bit too far these days, its forgotten about the people who can't afford to blow 30k of mods on a car.....

Any good scrappies up your way.....?

Thanks
Paul T

Nah Owens is the best. There is one in Taffs Well, just outside Cardiff, but they are tiny compared to Owens

Hi,
Has anyone got a good photo of the timing pulley on the cinq sporting engine, the rev counter I think takes its signal from this, as when I calculated my rev counter reading's when I put a signal in it was just under half(45%) of the reading it should have had, this makes me think the rev counter on a sporting is sensor controlled and not ignition controlled.

Thanks
Paul T

Timing pulley?

Crank or Cam end?
I presume you mean crank end..

FYI, the TDC sensor takes its signal from the outer ring of the alternator drive pulley (thats toothed), and that bolts into the crank pulley. I can get piccys, but not till sat-sun!

Could a 2 cylinder car tacho (e.g. off a 2CV or a 126 or something) fit? There is 1 tacho on ebay that is suitable for 2 cylinder cars. Would that work?
Cheers