Rev Counter - conversion 6cyl to 8 cyl

[Tim Murray]

Wonder if anyone has some electrician knowledge that they could help me with please ?

I'm in the process of removing a Ford Essex V6 engine from my Stag, to replace with an original Triumph unit.

My rev counter appearance is original, and always appeared to work properly, although I have always been suspicious that it was reading too fast. Thats a very subjective judgment so could be nonsense.

What I don't know is :- was the counter modified in some way, to make suitable for the 6 cyl - and then the obvious follow on question is - how do I return things to make suitable for the V8?

Many thanks, Tim

[mole42]

It might be a rev counter from a 2500 'S' or a MkII PI, they were six-cylinder cars with the same cosmetic appearance as the Stag dashboard.

[alan_thomas]

I am fairly sure Smiths Tachos have the 'no of cylinders' written in small writing on the face? - Alan

[V Mad]

Stag tach is marked "8 CYL" under the SMITHS lettering. Using it with 6 cyl would read low by 25% so it was prob you imagination, so you prob have a 6 CYL?

You can recalibrate these tachs but need to know what you are doing - easier to get a proper stag one.

NB: Note the Mk1 and Mk2 are not directly interchangeable.

[Tim Murray]

Thank for replies.

the Tacho in place looks exactly like it ought to. I.e. it says v8 in the tiny print. It also matches the speedo in style in every way, lettering, colouring, needle shape etc etc.
I 'think' its a Mk I version as the styling of all the instruments is different to my local pals, who I'm sure all have MKII's, and its a 1972 reg
Tim

[DJT]

This is a Stag Mk1 tachometer:

Unknown-1.jpeg

This is a Stag Mk2 tachometer:

Unknown.jpeg

[Tim Murray]

160315 WKY rev cntr.jpg

Ah ha ! :- So mine IS a Mk I then ! and, as you can see, is definitely noted as a V8

[new to this]

Wonder if anyone has some electrician knowledge that they could help me with please ?

I'm in the process of removing a Ford Essex V6 engine from my Stag, to replace with an original Triumph unit.

My rev counter appearance is original, and always appeared to work properly, although I have always been suspicious that it was reading too fast. Thats a very subjective judgment so could be nonsense.

What I don't know is :- was the counter modified in some way, to make suitable for the 6 cyl - and then the obvious follow on question is - how do I return things to make suitable for the V8?

Many thanks, Tim

i may have the same trouble as you,ive pulled my v6 out,to put v8 back in,are you sure the rev counter is not a stag v8 one ? the reason i ask is when they made the conversion (hurley) they keep a lot of the triumph parts

dave

[stag157.7]

mk 1 stag is adjustable via a potentiometer in the rear of the case
mk 2 is non adjustable
alan

[mole42]

[ATTACH=CONFIG]36815[/ATTACH]

Ah ha ! :- So mine IS a Mk I then ! and, as you can see, is definitely noted as a V8

Interesting - mine is a Nov 72 build but has the MkII instruments and does not have the hazard flashers!

Richard

[DJT]

Richard,

The hazard flashers in Tim's photo appear to have been retro-fitted. They weren't standard until the full Mk2 production started with LD30001 late in 73.
Mk2 gauges were introduced from LD20001, which probably includes yours.

[Tim Murray]

mk 1 stag is adjustable via a potentiometer in the rear of the case
mk 2 is non adjustable
alan

Alan, This sounds like the clue I've been hoping for, so thanks for that,

So how would I go about making the adjustment and getting it something like correct.

As for the hazard flashers - don't ask! Previous owner(s) have fitted alarms and immobilizer, and done it very very badly. You've never seen such horrid wiring. All being removed now and made tidy. Going to take a while !
Tim

[stag157.7]

pot is behind the smiths label(if its still there) small ordinary screwdriver will trim the needle, you will need a known tacho or signal generator connected to engine to compare with


alan

Alan, This sounds like the clue I've been hoping for, so thanks for that,

So how would I go about making the adjustment and getting it something like correct.

As for the hazard flashers - don't ask! Previous owner(s) have fitted alarms and immobilizer, and done it very very badly. You've never seen such horrid wiring. All being removed now and made tidy. Going to take a while !
Tim

[mole42]

Oh, thanks Dave - I thought I'd found another BL build oddity!

Richard

[Tim Murray]

[ATTACH=CONFIG]36828[/ATTACH] pot is behind the smiths label(if its still there) small ordinary screwdriver will trim the needle, you will need a known tacho or signal generator connected to engine to compare with


alan

Morning Alan,
Thanks for the attachment, which I'm guessing is a picy. Unfortunately I am not able to open it. Could I trouble you to try again, or send to me as a PM.
I am now able to borrow an optical tacho for setting/adjusting
many thanks, Tim