|
PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars |
Information |
|
Rev counter for PV 544 with a B18Views : 1249 Replies : 18Users Viewing This Thread : |
|
Thread Tools | Display Modes |
May 28th, 2024, 17:02 | #11 |
New Member
Last Online: Jun 10th, 2024 15:24
Join Date: May 2024
Location: Denmark
|
I looked and he also uses a 123ignition with a Bosch "High Energy Ignition Coil", like the one attached.
|
May 28th, 2024, 18:20 | #12 |
Senior Member
Last Online: Yesterday 23:17
Join Date: Sep 2021
Location: MILTON KEYNES
|
|
May 28th, 2024, 21:28 | #13 |
Master Member
Last Online: Yesterday 22:59
Join Date: Jul 2020
Location: Saskatchewan, Canada
|
Just a thought. What is the battery voltage on your Dad's PV? Is it still a 6 volt system? The 123 ignition systems operate down to 4 volts so they can be fitted on 6 volt vehicles; but, I expect the tach will want 12 volts.
If the vehicle is 6 volts, there are work arounds to provide 12 volts to the tach. They are called boost regulators, boost converters, or charge pumps. You can probably get one from Amazon that will give you 12 volts out with 6 volts in for less than $10. |
May 29th, 2024, 14:35 | #14 |
VOC Member
Last Online: Jul 25th, 2024 12:01
Join Date: Jul 2006
Location: Chatham
|
Picture shows a 12v coil so should be fine. B18 with a 12v dynamo I'd guess. Just sounds as if the wiring needs to be correct. Biltema tach is analog as it uses a needle rather than a digital display. If using a 123 dizzy there should be a wiring diagram for a tach. Google for one. Or ask 123.
https://www.123ignitionshop.com/gb/f...3ignition.html |
May 29th, 2024, 15:49 | #15 | |
Master Member
Last Online: Yesterday 22:59
Join Date: Jul 2020
Location: Saskatchewan, Canada
|
Quote:
Small point, an analog needle does not mean a traditional analog tachometer. An awful lot of the tachs with analog needles use stepper motors to control the needle. The actual display calculation is done digitally. Stepper motors are more robust than the traditional moving coil meter movements and these days probably cheaper. All of the input, calculation and the direct control for the stepper motor can be done on one micro controller that probably sells for less than $3 if you buy a few thousand at a time. I have a 2021 Audi A4 with traditional analog needle display for the tach and speedo and I know for a fact that the vehicle and engine speed are transmitted to the cluster via a CAN bus from the vehicle data gateway. It is digital all the way until the eyeball interface. My 142 also has an analog display tachometer which is digital driving a stepper motor and as I referred to earlier, it requires a configuration on first power up which involves assigning the number of cylinders. It is a lump until that configuration occurs. I am a unilingual Anglophone and I can't read the Biltema instructions; but, I see the multi cylinder reference so it must have some time of configuration required for cylinder selection. |
|
May 29th, 2024, 17:34 | #16 |
Senior Member
Last Online: Yesterday 23:17
Join Date: Sep 2021
Location: MILTON KEYNES
|
I think it says it can be used on a 2 to 8 cylinder engine by selecting the applicable number on the back of the gauge, are PV negative earth?
|
May 29th, 2024, 19:25 | #17 | |||
New Member
Last Online: Jun 10th, 2024 15:24
Join Date: May 2024
Location: Denmark
|
Quote:
Quote:
Quote:
So I am thinking, the Biltema one worked in essence, so maybe a higher quality one with the same functionality may work better. I will try and continue to find one which is similar to the Biltema one. Thanks for all the input guys. |
|||
May 29th, 2024, 19:47 | #18 | |
Senior Member
Last Online: Yesterday 23:17
Join Date: Sep 2021
Location: MILTON KEYNES
|
Quote:
https://www.ebay.co.uk/itm/226162129...mis&media=COPY |
|
The Following User Says Thank You to Rustinmotion For This Useful Post: |
Jun 8th, 2024, 23:31 | #19 |
Senior Member
Last Online: Jul 4th, 2024 00:08
Join Date: Sep 2019
Location: heptonstall
|
I bought a tach off eBay, I,m in Sicilia at mo so can’t nip out to car to look, the make. It’s sold for classics, looks like old style stuff found in 60’s a back motors. On back is 2, 4, 6 an 8 cyl switch, like 142 says. One wire goes to ignition switch for feed, one to earth, a one to signal, negative coil terminal. When u switch on, needle goes right round then back an settles at 800 tick over as engine running. Simples, squeak! Car is 12 v PV.
|
Tags |
b18, pv 544, rev counter wiring |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|