Honda K20A Start Problem

V3 BETA TESTS
1

Hi,

I managed to get the trigger sync’d but now have problems starting the engine. This is new for me, I never had problems starting the engine in v2. The cranking and afterstart procedure changed quite a bit though and I have tried to adapt the settings from v2 to v3 but there are fundamental differences. This is the first engine I try to start more or less from scratch, so please be kind with me :upside_down_face:.

This is a log from v2 with the engine starting:

Bildschirmfoto 2024-06-07 um 20.07.19
Bildschirmfoto 2024-06-07 um 20.07.191530×1566 217 KB

Logs from v3 with the engine not starting:

Bildschirmfoto 2024-06-07 um 20.08.03
Bildschirmfoto 2024-06-07 um 20.08.031530×1566 233 KB

Bildschirmfoto 2024-06-07 um 20.25.20
Bildschirmfoto 2024-06-07 um 20.25.201530×1566 240 KB

I tried a lot of different settings with more or less fuel but the result is always the same: Engine starts and dies immediately.

Some observations:

  • The RPM graph on the v3 log looks rough with big steps. Maybe there is still a problem with the triggers, although they show as sync’d?
  • The Min and Max markers are missing although I activated them.
  • I have the feeling the engine should run but doesn’t.

Any ideas?

Christian

2

publish log file and calibration. I will take a look.

3

I got the engine running and found the issue.

First I tried to start with an additional battery and a battery booster, which increased cranking RPM and battery voltage, but no success.

20240608_1131 shorter than.emublog3 (29.6 KB)

Then I switched back to N+1 trigger setting instead of shorter than factor 0,45 with less afterstart fuel, but no success.
20240608_1159 n+1 less fuel.emublog3 (431.9 KB)

I tried wasted spark ignition and the car started and ran without problem :+1:.
20240608_1201 wasted spark.emublog3 (166.8 KB)

Then I tried invert phase in firing order and wasted spark only during cranking and the engine started and ran without problem as well :+1:.
20240608_1208 inverted phase.emublog3 (133.1 KB)

Odd: In the log the trigger synchronization jumps from NOSYNC directly to SYNCHRONIZED, skipping SYNCHRONIZING.

I have read something about invert phase but can’t remember. Is this an issue with my calibration or the software?

4

invert phase offsets the spark by 360 degrees.
in v2 youbhad the ignition output offset parameter.
but it was not clear for many users and not easy to use when you have to change the phase for 3 and 5 cylinder engines.
now it is very simple, just tick an option invert phase

5

I did not see the ignition output offset of 2 in the v2 calibration. Now it all makes sense!

6

Could you please expain which configuration was wrong and caused the need to invert the phase ?