Odd-fire V2 bike engine ( it helps to state the case :-)
- 420/300 degrees
- (60 degrees V2 engine)
This install seems to have stalled because of neglecting 2016-11-22 recommendations to capture triggerlog with recent (eg. 1.2.31) firmware
- Also review page, apply some cleanup, and correct errors (eg 34-2 and things like that)
Trigger setup
- primary trigger on crank: 36-2 (not 34 - 2 as previously stated)
- 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 300/420, not 360/360
- we've set it up for the odd fire, we assume that it is correct.
- maybe. Odd fire means RPM is measured every 2nd trigger to smooth out the unevennes (essential for low toothcount "coil type wheels", might be needed here also)
assuming a 36-2 trigger wheel
I would set it up as 4 cylinder with individual spark delay
- next trigger tooth = 18 (events every 180 degrees as a starting point)
- individual spark delay=60 degrees where needed (verify triggerlog and with scope on bench, than with strobe-light)
- use min 2 (4 if possible) unused ignition outputs (alternating fashion) in the slots where no ignition needed (no cylinder). Repeating any certain ignition output might shorten the dwell-limit (angle, matters at high RPM) for ALL ignouts.
- try to enable odd-fire if RPM reading fluctuates, but also try with odd-fire=disabled.
- use recent (>=1.2.31) firmware and publish triggerlog and .vemslog (captured with that)
- if you have triggerlog, and can export a reasonable wav from your triggerlog, can be useful (but triggerlog file still important)
- 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)
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.
- first cylinder is the rear one
- the crank rotates in the same direction as the wheels
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, (2016-11-22 <= Continue from here)
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 2,4 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.
<= IMPORTANT: required to continue. Required condition for support
Yes, see if you can do a triggerlog like Dave suggests. 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
