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Rover V8 Compatible Tachometer
Posted: Wed Nov 28, 2012 9:01 am
by AntonZdz
All
Would the below tachometer be compatible with a 3.9 Carbed Rover V8.
http://www.ebay.co.uk/itm/271093205330? ... 1423.l2649
Thanks!
Posted: Wed Nov 28, 2012 9:59 am
by kiwicar
Hi
Same basic gauge but from McGills and £5 cheeper (ok the face is a different colour).
http://mcgillmotorsports.co.uk/index.ph ... ductId=581
They deliver within 2 days normally and offer proper product support.
If it were me. . . I would go with McGills, and I do buy alot of stuff direct from China.
Best regards
Mike
Sorry editd to put the link in! makes a little more sense that way!
Re: Rover V8 Compatible Tachometer
Posted: Wed Nov 28, 2012 11:00 am
by DaveEFI
Doesn't give any information on how it's driven, does it? Modern cars have a low voltage pulse from the ECU - older ones commonly a high voltage one from the coil negative. Should be possible to design one to work from either, though.
Posted: Wed Nov 28, 2012 2:47 pm
by AntonZdz
Awesome thanks for the link, will get the McGill one, I only need the motor inside anyway as its going to be driving an original needle over a new facia.
Thanks guys!
Posted: Thu Nov 29, 2012 10:30 am
by bodger
AntonZdz wrote:Awesome thanks for the link, will get the McGill one, I only need the motor inside anyway as its going to be driving an original needle over a new facia.
Thanks guys!
Call mcgill first , they do say on their ebay ad that the rev counters DON'T work on rover V8's so worth a call first ...
i did and they said NO
Posted: Thu Nov 29, 2012 7:20 pm
by stevieturbo
Bit of a generic thing to say they dont work on RV8's
Given they dont know what ecu, what ignition system etc and the fact they've been used over a 30year range.
A bit more info as to what they do require to make them work would be better, or reasons as to why they dont work with a RV8, which again is very dependant on exact model they are referring to.
Posted: Fri Nov 30, 2012 12:05 am
by DaveEFI
Perhaps they're only suitable for 4 cylinder engines?
Posted: Fri Nov 30, 2012 1:06 am
by stevieturbo
I guess it's possible. But any aftermarket rev counter I have ever seen are all switchable for various cylinders.
Although none of them were cheap chinese stuff. Or at least not cheap modern chinese stuff...
Might have been old, and who knows where they were made lol
Posted: Fri Nov 30, 2012 9:45 am
by bodger
stevieturbo wrote:Bit of a generic thing to say they dont work on RV8's
Given they dont know what ecu, what ignition system etc and the fact they've been used over a 30year range.
A bit more info as to what they do require to make them work would be better, or reasons as to why they dont work with a RV8, which again is very dependant on exact model they are referring to.
quote taken from McGills site :
Suitable for 4, 6 or 8 Cylinders , but will not work on Minis ,Land Rovers or any British Leyland vehicles or diesel Transit vans !!
Ideal for coil ignition systems ,ECU's ,W Terminal Alternator feeds or Crane/MSD Electronic Ignition systems.
It will not work on multi coil ignition systems
Posted: Fri Nov 30, 2012 11:16 am
by DaveEFI
Love to know what's different about a standard Lucas points/coil system?
Posted: Fri Nov 30, 2012 11:22 am
by DaveEFI
Just to add I had problems with my SD1 tach when I changed to EDIS8. The original was Lucas DLM with the dizzy mounted amp. I tried all the various diode circuits shown with both pull up and pull down resistors. And the transistor firing a relay coil. Non was perfect. Eventually changed the movement driver inside the tach to a design I found on the net, which works off the EDIS tach feed.
Posted: Sat Dec 01, 2012 11:57 am
by bodger
DaveEFI wrote:Love to know what's different about a standard Lucas points/coil system?
yes me too , i found a really basic one on ebay in the end and it works fine ...
1 power
1 earth
1 signal from the coil neg ... simples !
Posted: Sat Dec 01, 2012 7:00 pm
by SimpleSimon
DaveEFI wrote:Just to add I had problems with my SD1 tach when I changed to EDIS8. The original was Lucas DLM with the dizzy mounted amp. I tried all the various diode circuits shown with both pull up and pull down resistors. And the transistor firing a relay coil. Non was perfect. Eventually changed the movement driver inside the tach to a design I found on the net, which works off the EDIS tach feed.
Same here
the 4 linked diodes from the LT side of the coil's trick had my Tach spiking all over the place eventually sorted out by a Tach converter that takes its input direct from the IDM pin on the EDIS 8 module and is now sound as a pound and accurate too
