10-04-2019, 06:28 PM
For the benefit of mr Norris et all ( not mr K ) here is a video clip that shows in slow motion what the injectors are doing when the engine fires up from cold.
Two led's are connected across injectors 1 and 4, they light up when the injectors are operated, there is one double firing at the start button push and then another four double shots of fuel into both ports.
After what seems like a small pause the no1 cylinder fires and then no4 cylinder and so on.
It appears that the double dose just gets the ( cold ) engine going and the decision ( electronic dice ) is then made by firing one cylinder at a time and waiting for the crank sensor to report a higher frequency at which time success is registered and the engine runs in the " uneven " sequence.
There is a lot more to this of course but now we know a bit more about what actually happens.
You all may have noticed that it takes the cb1100 to always take a bit of time to start up even if it is warm, the next question is; what if the engine is bump started, does it remember in what sequence it was before it stopped?
The clip is slowed down to 7% speed but the pitch of the sound remains the same hence the eery soundtrack, the unusual firing of the led's once the engine is running is the result of the frame rate and rev's mismatch and appears out of sync, in reality they fire at the correct time and sequence, i had a hard time getting this part as best i could on video;
https://youtu.be/9yPijlJBang
And Joe, would you be able to tell us what the clearances and shim sizes were before and after so we can complete this thread here;
http://cb1100forum.com/forum/showthread....#pid139671
Two led's are connected across injectors 1 and 4, they light up when the injectors are operated, there is one double firing at the start button push and then another four double shots of fuel into both ports.
After what seems like a small pause the no1 cylinder fires and then no4 cylinder and so on.
It appears that the double dose just gets the ( cold ) engine going and the decision ( electronic dice ) is then made by firing one cylinder at a time and waiting for the crank sensor to report a higher frequency at which time success is registered and the engine runs in the " uneven " sequence.
There is a lot more to this of course but now we know a bit more about what actually happens.
You all may have noticed that it takes the cb1100 to always take a bit of time to start up even if it is warm, the next question is; what if the engine is bump started, does it remember in what sequence it was before it stopped?
The clip is slowed down to 7% speed but the pitch of the sound remains the same hence the eery soundtrack, the unusual firing of the led's once the engine is running is the result of the frame rate and rev's mismatch and appears out of sync, in reality they fire at the correct time and sequence, i had a hard time getting this part as best i could on video;
https://youtu.be/9yPijlJBang
And Joe, would you be able to tell us what the clearances and shim sizes were before and after so we can complete this thread here;
http://cb1100forum.com/forum/showthread....#pid139671