Differential Diagnosis on ignition brain
#1
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Thread Starter
Differential Diagnosis on ignition brain
I get an occasional back fire getting on plane (one side only) but once there it runs well. I of course think ignition problems and have been replacing parts one at a time and have rechecked my timing.
My first question is what are the symptoms of a bad Crane HI-6M ignition? Is it all or nothing? ie it either runs or it doesn't? or can it give intermittant problems?
My first question is what are the symptoms of a bad Crane HI-6M ignition? Is it all or nothing? ie it either runs or it doesn't? or can it give intermittant problems?
#2
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Let me simplify my question;
If the Ignition box is defective, does it cease to run completely or can you get intermittent misfires etc?
If the Ignition box is defective, does it cease to run completely or can you get intermittent misfires etc?
#3
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Easy thing to check-your boats a twin if I remember right-just swap boxes side to side and you'll know. I have a crane box that I run on my boat,it runs flawless but I had other ignition boxes that worked intermittently so its possible,Smitty
#5
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Smitty,
Thanks, I was hoping to at least find out if intermittent problems were a possiblity before I did that and I will of course do it If I don't solve it with my latest fixes. Unfortrunately, I have used up my last caps and rotors for the billet Holley distributors I am running now and they are discontinued distributors.
Jim, Yes it is the same. Although the difference ,may not be as much as I first thought. I do notice the forward engine taking longer to get up to speed though. I am still going to check into a lighter Driveshaft.
On the to do list for this winter includes Fuel Flow meters so I can really watch it. I am also building EFI engines with O2 sensors in the collectors but they probably won't be ready before the next season.
Thanks, I was hoping to at least find out if intermittent problems were a possiblity before I did that and I will of course do it If I don't solve it with my latest fixes. Unfortrunately, I have used up my last caps and rotors for the billet Holley distributors I am running now and they are discontinued distributors.
Jim, Yes it is the same. Although the difference ,may not be as much as I first thought. I do notice the forward engine taking longer to get up to speed though. I am still going to check into a lighter Driveshaft.
On the to do list for this winter includes Fuel Flow meters so I can really watch it. I am also building EFI engines with O2 sensors in the collectors but they probably won't be ready before the next season.
#7
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Thread Starter
Boy, I would love to hear you elaborate on this. I have been on the phone with Dean Nickerson and have worked through several potential problems with nothing panning out so far.
I also thought a backfire always killed your powervalves which may not always be true.
Please elaborate!!
I also thought a backfire always killed your powervalves which may not always be true.
Please elaborate!!