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About oldtuckunder

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  1. Enlarging a hole

    Funny you should say that, I did that to a large drill about two years ago when I wanted to mill a channel in the surface of a metal plate and didn't have either the right tools or time to take it somewhere, it worked well, but never had the nerve to admit to such rough engineering before! Alan
  2. Enlarging a hole

    Well digging through an old box that probably hasn't been opened in 20+years I found a 19mm drill (well given age of it almost certainly a 3/4") it had a morse taper, but I have various old taper holders, so I just machined a rough looking one round so it would go in the Pillar Drill Chuck, and with everything locked as tight as it would go, I gave it a go, and it worked perfectly as you can see from attached shot. I think it only worked because it was Alloy, if it had been steel I think the tug of the existing hole would have been too strong, but anyway Job Done, maybe not a master piece of engineering, but will do me. You can see why I needed to drill off centre. Alan
  3. Trigger Wheel Mounting Vitesse

    Yes but if you look at 70% at 5.5K the advance is still 40 deg, which if I was lifting would be fine, but going back under load that's a lot of advance
  4. Enlarging a hole

    Ah about the same price as the milling bit, and with a 19mm shank would easily go in my press chuck, as I also have a couple more 19mm holes to drill in the alloy it might do everything I need. Alan
  5. Trigger Wheel Mounting Vitesse

    Not Sure if you have to calibrate it you have the MAP version? There is nothing in the manual about having to calibrate the internal MAP sensor 5.1 MAP For 3D MAP control, simply connect the MJLJ bulkhead connector to a suitable vacuum point on the engine. A suitable vacuum point is one that gives a good representative indication of average manifold air pressure – take-off from a plenum chamber is best, and from the barrel of single choke on a multiple carburettor set-up is worst. It is recommended that the vacuum installation minimises the chance of moisture entering the MJLJ unit and affecting the on-board MAP sensor. Techniques such as not mounting the MJLJ well below the vacuum take off point and having a “U-bend” between the takeoff point and the MJLJ can help. Once you have connected the vacuum hose to the ECU start the engine. It should now be running with the MJLJ controlling the ignition advance in a 3D MAP mode. Check the timing at idle with a strobe light. It should be the timing set in the map for the idle rpm and measured MAP. Blip the throttle, whilst checking the timing using the Advance gauge in the Configurator. It should be move according to the values set in the map – there will be low manifold pressure (indicated by small KPa values) when the throttle is closed and high manifold pressure (indicated by large KPa values) when the throttle is open.
  6. Hi Wise Metalworking Guru's I have a 15mm hole in an alloy plate (about 8mm thick) I wish to enlarge this hole to 19mm so I can tap for 1/2" BSP, however I don't want to just enlarge the hole but to do it off centre as per attached diagram. I have the tap(s) but not the correct size drill, so I have to buy something. The Alloy plate is an awkward shape so I cant mount on the lathe and bore it, so I'm going to have to use the big drill press which is fairly sturdy and I have a 360 movement vice on it so I can get it in the correct position and lock it, but I know that ordinary drill have a nasty habit of wanting to centre on an existing hole if they can, so I was wondering as I want to keep the bit as fixed as possible should I go for something like this. https://www.ebay.co.uk/itm/HSS-Blacksmiths-Drill-Bit-Reduced-Shank-Drill-Bits-14mm-to-25mm-Steel-Drilling/401142942842?ssPageName=STRK%3AMEBIDX%3AIT&var=670688525016&_trksid=p2055119.m1438.l2649 or a milling bit like this https://www.ebay.co.uk/itm/3-4-19-05mm-HSS-4-FLUTE-AUTOLOCK-END-MILL-EUROPA-TOOL-CLARKSON-5072010480-96/272108814761?hash=item3f5af301a9:g:chgAAOSwX~dWnOfr Alan
  7. Trigger Wheel Mounting Vitesse

    Hi Nick Nice Map! Could you explain what happens in rows 11 & 12, which (and remember I'm still an absolute novice) Row 12 is essentially throttle shut and Row 1 is WOT? so lets say I'm running WOT at 5.5K (I'm assuming that my advance is set from top RH cell i.e. 34.0), If I lift I jump to bottom RH cell i.e. 32.0 (fine) my revs may have only dropped a tad, and then I gently open the throttle a bit, I'm running high revs, small throttle opening, highish vacuum, and my advance jumps to mid 40's on a probable lean mixture? I think I understand the high advance orange/red cells if you are lifting from highish rpm's as no load and little danger, but don't understand the same settings as throttle is being opened. As you see I have a lot to learn. Alan Alan
  8. Compression Ratio

    No idea of the results yet, apart from it will start and run, but went through the same conundrum when getting head machined in Jan. Was happily running 9.3, (but who is ever happy?) thought of going 10, but with a few inputs regarding head studs, cam duration etc opted for 9.75:1 in the end. As they say taking metal off is easy, putting it back again not so. Alan
  9. Trigger Wheel Mounting Vitesse

    One of the things I had considered John was that the MJ provided 3D mapping i.e. RPM + LOAD whereas as a distributor only provides 2D RPM, I had thought I might create a 2D map in MJ that represented the mechanical advance curve, where all the load settings for an RPM band were identical, as I thought that might give me a direct comparison between dissy and MJ. As Mechanical Advance is all in by low 3K's the MJ RPM table could be quite granular rather than the rather big steps it uses by default. I'm not sure if/how the MJ smooths the curves through an RPM band though. Alan
  10. I'm at john.r.davies@btinternet.com.

    Thanks, Alan! 

  11. Trigger Wheel Mounting Vitesse

    Hi John On the CD I got are three triumph Maps, TriumphGT6, TRiumphTR250, TriumphSpit1500 PM me your email address and I will send, these are .mjlj files Alan
  12. Trigger Wheel Mounting Vitesse

    John its a 36 tooth wheel, 360/36 = 10 = 1 tooth out of alignment. Alan
  13. Trigger Wheel Mounting Vitesse

    Good work John, Well done. I have made a significant start on my MJ wiring! by wiring the two pin plug for the Sensor! have to wait for the correct coil pack plug before I can do more. Solved my small conundrum about why I had a 16 pin MJ plug rather than 14, I finally loaded the documentation CD and read some instructions RTFM, it appears I have Version 4 not Version 3 and they have added a couple of extra outputs. Alan
  14. Trigger Wheel Mounting Vitesse

    I'll have to ask JDO what they used in converting my cable tacho, from a browse on their website could be RVI or RVC, but I'm thinking its RVC from the little bits of info. I have a feeling that the extra tacho driver cable with the kit must be the equivalent of the three zener diode option you describe (as that what it looks like) if it is and JDO confirm RVC that's probably the option to go for, and if it really cleans up the signal may also work for the data logger. Alan
  15. Trigger Wheel Mounting Vitesse

    Ok Wise Wiring Wranglers! I have a couple of questions, had been about to put a spurt on and see if I could get the Vitesse running on Edis in limp mode, just to see if bits were working, and following John's tribulations see if I could get the initial wiring correct. However hit first stumbling block on discovering that new coil pack plug sent with my kit was for an Edis4 (3pin) not Edis6 (4pin) so going to be a few days delay whilst that is sorted. However whilst going through wiring diagrams I have hit a couple of questions. 1) Shielding and earthing. Looking at the diagrams and the current wiring loom on my EDIS plug, I can see that the shield on the VR sensor doesn't connect to earth at the sensor end, but does connect to the shield connection (pin 7) at the Edis Plug end. From the wiring on my EDIS plug I can see that 7(shield) was connected to the shield around the Sensor wires (5&6) and also to the shield around the Pip and Saw wires (1&3). Looking at my existing Edis plug wiring there is an Earth wire (pin 9) but no connection from 7 (shield) to pin 9. So my assumption is that the Edis Plug (or Edis Unit) makes a connection to earth (9) internally from (7). However this is slightly confused by looking at the wiring diagrams where everyone shows a connection from the shield on VR to earth at the Edis Plug. However just to add to my confusion I notice that in the wiring diagrams that the shield on the PIP and SAW are also shown with their shield connected to earth at the EDIS plug end, but also shown with their shield connected to earth at the MJ plug end! Now what I do know is that only one end of a shield wire should be earthed! So unless someone tells me otherwise, my assumption is going to be shield runs from VR sensor and connects to pin 7 (shield) on Edis Plug, shield runs from MJ plug around PIP and SAW and connects to pin 7 (shield) on Edis Plug. And that I don't make a connection to earth (9) from (7) at the Edis Plug, and I don't make a connection from shield to earth at the MJ end either. The only reason I can think otherwise would be if there is no connection at Edis between (7) shield, and (9) earth, in which case as the shields on VR and PIP/SAW are connected together at pin 7, then earthing the shield at the MJ end would make sense. Ok now you see how I can make a mountain out of a mole hill on just grounding the shield, my next issue 2) Driving the Taco(s). I have an electronic Taco conversion that drives happily taking a wire from the coil "-", I also have a datalogger that theoretically should also take an input from coil "-" but never has always over reading by about 100% (there are various circuit mods out there that are supposed to fix this) but as the data logger came with an inductive clamp as well that works perfectly I never bothered to do anything. So in implementing MJ I have to provide a trigger source for the Taco and also one for the data logger (as with wasted spark the induction clamp will be useless). However I seem to have three sources of Taco single. Pin 2 of the Edis plug is described as Taco Out, Pin 14 of the MJ Plug in the wiring diagram (even more confusing as my MJ plug has 16 not 14 as shown in pictures!) is also described as Taco Out, and to finally confuse me with my kit I have been provided with a neat bit of wiring complete with inbuilt circuit board that is described as an old fashioned (ie. high voltage signal) Taco driver that has three wires one that connects to each of the Edis to Coil pack signal wires, run to this tiny embedded circuit board, that then has a single wire coming out that is to go to a Taco. So I'm assuming that the Edis plug Taco Out (pin 2) is of no use to me, that the MJ plug Taco Out (pin 14 or what ever) is of no use to me, and the taco signal I should be using for both Taco and Datalogger is the special wired one? Any inputs gratefully received (or outputs!) Alan