Hi, try setting the trigger at 60 degrees before TDC. If you added your own trigger wheel, you have to check where the missing tooth/teeth are.
Second cylinder fires 420 degrees later, first cylinder fires again 300 degrees after that and so on.
I assume the first cylinder is the rear one and that the crank rotates in the same direction as the wheels.
Trigger setup
- primary trigger on crank: trigger wheel 34 - 2
- are you sure ? isn't it 36-2 or 36-1 that would at least make sense ? (screenshot below suggests 35 teeth, so 36-1)
- VR-sensor sits at 65 degrees when cyl 1 (rear cylinder) is in TDC off the trigger tooth No. 6 and cylinder 2 is top off the tooth No. 12
Events aligned to 120/60, not 90/90
- we've set it up for the odd fire, we assume that it is correct.
- no, you most likely get better without odd fire (which means every 2nd trigger is measured only (enabling odd-fire useful for low toothcount "coil type wheels")
assuming a 36-2 (or 36-1) trigger wheel
I would set it up as 8 cylinder with individual spark delay
- next trigger tooth = 9 (events every 90 degrees as a starting point)
- individual spark delay=30 degrees where needed (from 90=>120 deg, so aligned to 120/60 as a result)
- use min 2 (4 if possible) unused ignition outputs (alternating fashion) in the slots where no ignition needed (no cylinder)
- try to enable odd-fire if RPM reading fluctuates, but also try with odd-fire=disabled.
- do NOT forget to publish .vemslog of your best so far effort (not just heresay)
- if you have triggerlog, and can export a reasonable wav from your triggerlog, that also helps. But signalgen "m342" can be used to simulate 36-2 on bench (setting up soundcard+bench and LEDs is useful to start any odd setup before applying to real engine)
And yes rotation direction is the same as the wheel spins.
But it will not really run and when it does, it goes really hard and then goes out after about 10sec.
Hello Dennis,
Could you provide a triggerlog of engine cranking 8-10 seconds without IGN and INJ fuse (but spark plugs mounted in engine so with normal compression cycle). Also make a vemslog of the same sequence.
Without enough data it is very hard to make suggestion to you to correct your setup. Lets start out with the basics, what engine are you installing; mount of cylinders, etc.
Please upload these files to your MembersPage directory in the FileArea and link them to your wiki page. After receiving these files and engine details i will review and make suggestions on how to proceed.
Best regards, Dave
Hello Dennis,
I have reviewed your triggerlog you seems to be running some very old firmware 1.1.94 i would recommend upgrading this to 1.2.31 first.
Than regarding the triggerlog itself, good format and length, perfect. Your triggerwheel is 36-2 and signal is without errors.
To setup this engine we will configure it as follows:
- equally spaced reftooth array set 6 24 6 24
- odd-fire mode off
- in spark delay table use 0 60 0 60, this will cause the reftooth 24 cylinders to be offset by 60 degree.
- tdc delay should be around 65 degrees.
Please provide a new triggerlog and a small vemslog of the same sequence (cranking without ING and INJ fuse like before) after upgrading the firmware and applying the suggested settings so i can review.
Thanks!
Best regards, Dave
Yes, see if you can do a triggerlog like Dave suggests. (BTW, this is an odd-fire V2 bike engine). If the triggerlog looks nice, you probably just have the wrong amount of fuel or wrong basic fuel settings. Also, look at the top indicators in VemsTune. They will indicate trigger failure when the engine stalls, if the trigger setup isn't correct.
Odd-fire is correct. I am almost sure you have to choose odd-fire if you want to enter different angles between the ignition pulses (420/300 degrees). For even-fire, they all have to be the same.
\Alex
Good evening.
I'm having trouble getting the Vems to ignite at the right time.
It is a motorcycle Aprilia RSV Mille 1000cc V60 engine.
There are only 60 degrees between the cylinders.
The problem is that it hits right on one cylinder, but on the other it is about 110 degrees past the point where TDC is. Where you can see the screwdriver from the left side, there is a fact where TDC is on cylinder 2.
Hope there is a kind soul that can help me.
Do not know if it does anything but the engine is running counterclockwise.
Cylinder 2 ignite for tooth 28. when there are 18 in next trigger tooht
This is cylinder 1 TDC at tooth 11
Here ignites the cylinder 2. But it's about 110 degrees too late
This is where it ignites tooth 28. when there are 18 in the program
This is the new trigger wheel 36-1
