NOOB Harley V-twin No Spark

[hybrid]

Was that before or after you made setting changes though?

[mjhillen]

That was the original, appears to be no difference with a MAP sensor change.
Currently, I have managed to get it to 0* timing on the rear cylinder with trigger angle to 80*, but when i power down the microsquirt it comes back on with an error message that 20* is max. Tried to flop polarity on the map and it doesnt change anything.

[hybrid]

Trigger angle should generally be set against cylinder #1.
Get that right for starters.

Then if #2 is out, then the oddfire settings may be wrong.

[mjhillen]

HD 32-2 odd fire angle is predetermined. Its not a setting that i change. I only have timing marks on the cam gear for the rear cylinder because it is #1 from harley.

[hybrid]

Ok, so if you set your trigger angle so that the timing on #1 is right and #2 is wrong:

1) The 32-2 setting is not the one you need, or;
2) The 32-2 code is broken

[hybrid]

Just had another thought.
I have no idea about Harley engines, but it's possible that although the timing marks are on the rear cylinder, that you're actually meant to check the timing with the light connected to the front cylinder.

[hybrid]

Hold on... timing marks on the cam gear? Really? The cam will only turn at half crank speed.

[mjhillen]

the harley is a 45* v-twin. it fires on a 315*-405* pattern so you have to check the rear to the timing mark, if you could make a 202.5*(cam timing) mark on the wheel you could check #1.
How can i check the code to verify the offset angle?, I know that the HD 32-2 was written for this engine.

#1 only fires once per cam revolution, Same with#2 unless im missing something?

[jsmcortina]

#1 only fires once per cam revolution, Same with#2 unless im missing something?

It is wasted spark. The coil fires every rev but with different timing. On one rev it is timed to TDC#1 and on the next rev to TDC#2.

James

[mjhillen]

You can put paint marks on the alternator rotor and primary inner cover, put them where you can see them through the inspection cover.

Use one dot on the rotor for front TDC and 2 dots on rotor for rear TDC.

Then you can use a timing light to see what is happening.

i will do that tonight.

any thoughts on why i get 2 sparks on cyl 1per cycle and only 1 spark on cyl 2? its not waste spark, it doesnt correlate to either cylinder. its 2 sparks in rapid succession.
cyl 2 doesnt do that.

As previously mentioned,I am only getting 1 spark on the rear plug, I do, however, get 2 sparks on #1 but its at a very odd timing

[hybrid]

It has two coils?
And you're using two separate ignition outputs on the MS?

[mjhillen]

Yes, 2 coils, 2 ignition outputs.

[mjhillen]

Ing1 to the front, ing2 to the rear. #1 is set as output D14.

[jsmcortina]

Yes, 2 coils, 2 ignition outputs.

I don't think that is supported.

James

[hybrid]

Ok now we might be getting somewhere.

Wasted spark on a twin cylinder will generally mean one output only.
If you are using logic level coils, can you try connecting Spark A to both coils and see how that goes?

[mjhillen]

So, you're saying I need to run both coils from 1 output?

The harley factory coil has no igniter, and is 2 coils built into 1 unit with 2 seperate trigger pins. That wouldn't operate off of the microsquirt so I installed 2 ls2 truck coils still fired independently.

[jsmcortina]

If you are using two outputs you would normally need to select "coil on plug" I forget whether that is supported in this mode. I'm pretty sure I only tested the wasted spark configuration.

James

[mjhillen]

you are correct, It will not allow the COP as a valid configuration.

[hybrid]

Yes, so on my V8 I'm running wasted spark with 8 LS1 coils.

4 spark outputs - each output is connected to two coils.
So split your SparkA wire into two and connect it to the low level trigger on each coil.

Both coils are going to spark for each cylinder at the same times, but because only one is on the firing stroke, the other won't actually do anything but spark the plug.

[mjhillen]

If you are using two outputs you would normally need to select "coil on plug" I forget whether that is supported in this mode. I'm pretty sure I only tested the wasted spark configuration.

James

Can you peek at my MSQ and see if the any of the ignition settings need changed?