MoTeC Global Forum

Hi，I have a tri-cylinder triumph 675 that doesn't have a camshaft sensor. I'd like to start it, but I've never come across a car that doesn't have a camshaft sensor. I don't know which one to choose for REF/SYNC mode.Which mode can be used in addition to mode 65?What other Settings need to be changed for such a machine?
I am very anxious, I hope to get your help, thank you!

Look at this thread. This is asking exactly the same question. Perhaps one of your teammates?

viewtopic.php?f=47&t=4142

Thank you for your feedback. Yes, he and I are partners, but the problem we are facing has not been solved, which has been troubling us for a long time.

And that problem is ?

My problem now is that I use is a mode of eight, two stroke, when I will come out the spark plug in the absence of cylinder pressure test under the condition of fuel injection and ignition is very normal, but once put back to normal spark plug ignition no fuel injection and ignition, I don't know what reason be affected, I confirm that the external devices without damage, you know what is the model can be used in the triumph of 675, preferably 4 stroke.

Have you wired up a single cylinder MAP sensor to the Sync input? If so, post the REF/Sync capture when cranking and perhaps we can help you figure out what the trigger looks like and which mode would work for you.

Thank you very much for your help!Yes, I tried to use mode 65 to install the MAP sensor in a cylinder and use it as a synchronization signal, but we failed and the engine still did not have fuel injection and ignition.But the use of MAP as a synchronization signal was obviously not suitable for us because we were going to modify the air intake, so we used mode 8, two-stroke, and to my surprise everything was fine when I pulled the spark plug out to test the ignition and fuel injection, but when I put the spark plug back in, there was no ignition and fuel injection.Below is the REF/SYNC signal I collected.

I think the problem you experience with spark plugs in, is that the two missing teeth are hard to detect on the revolution where it occurs close to TDC of one of the cylinders. Any chance to move the Ref-Sensor pickup angle to somewhere the crank speed will be fast? You should be triggering on falling edge with that pattern.

I don't see how you can run a 3 cylinder engine in wasted spark (2-stroke) mode since there will not be the same number of TDC events on each revolution of the crankshaft. I would think that you would need sequential injection / ignition and to do that, you will need a sync signal.

Can you find a way to fit a sensor to the camshaft? I suggest reading the help for Mode 7 (I think this is what you would use) -- there are restrictions on the Sync signal timing). It could be a Hall or Magnetic sensor that just picked up one lobe of the cam. Here is a picture of a hall sensor mounted to a valve cover that can detect a Cam lobe:

https://www.klrchris.com/klr650-fuel-in ... on-sensor/

Good Luck!

I am very sorry for the late reply. I was not at work recently.
Ok, thank you for your advice, I now want to try to use two burst mode to start the engine, because of his clear instructions in mode 8 do not need to sync signal, so I want to try, as to add the camshaft sensors, I think for this I also is not very understanding, finally, of course, if there is no way I will try to add the camshaft sensors under the condition of.I will give feedback on the results later. Thank you again

Happy Chinese New Year!
I think adding a cam sensor will be best if your regulation allows.
Using the MAP sensor may not work with your single throttle setup.