coil question
Could a bad coil cause an engine not to rev past 5000 rpm.Motors run great till I hit 5000 and then I see one motor has a bounce in the tack and both motors wont run past the 5000 point even with different props.These motors ran to 6000 on the dyno and the only thing I changed is the coil.I also checked fuel supply and 5 psi at max rpm and O2 sensor says they are running 10.8 afr.
Thanks Nordic95 |
Re: coil question
Originally Posted by nordic95
.These motors ran to 6000 on the dyno and the only thing I changed is the coil.I also checked fuel supply and 5 psi at max rpm and O2 sensor says they are running 10.8 afr.
Thanks Nordic95 It's also unlikely that BOTH coils have the same problem. |
Re: coil question
Originally Posted by mopower
The boat have a rev limiter in it? Mine at 10.8/10.9 A/F left the plugs DARK brown. Might want to take out a little jet.
It's also unlikely that BOTH coils have the same problem. Thanks Nordic95 |
Re: coil question
ttt
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Re: coil question
if you suspect the coil(s) then swap them out. No biggy. CanDo
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Re: coil question
Originally Posted by nordic95
Could a bad coil cause an engine not to rev past 5000 rpm.Motors run great till I hit 5000 and then I see one motor has a bounce in the tack and both motors wont run past the 5000 point even with different props.These motors ran to 6000 on the dyno and the only thing I changed is the coil.I also checked fuel supply and 5 psi at max rpm and O2 sensor says they are running 10.8 afr.
Thanks Nordic95 I had that problem in Lake George. Tach was bouncing back from 5000-4800rpm. Thought it may have been the tach,found out in LG was the coil. Motor died out in the first leg of the run. I have had 2 MSD Blaster coils go down on me in the last 40hrs on my boat! I now have a spare on board. |
Re: coil question
Originally Posted by DRIPPINWETII
I would say yes.
I had that problem in Lake George. Tach was bouncing back from 5000-4800rpm. Thought it may have been the tach,found out in LG was the coil. Motor died out in the first leg of the run. I have had 2 MSD Blaster coils go down on me in the last 40hrs on my boat! I now have a spare on board. Epoxy filled and can be mounted in any position. |
Re: coil question
If I was to use this with the stock Thunderbolt IV set up will a ballast resistor be necessary??
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Re: coil question
Originally Posted by Iggy
If I was to use this with the stock Thunderbolt IV set up will a ballast resistor be necessary??
If you have a ballast resistor now, then I believe you would keep it. |
Re: coil question
Originally Posted by Wobble
MSD tech recommended this coil for marine use. http://www.msdignition.com/coil_blaster_3_8222.htm
Epoxy filled and can be mounted in any position. I will switch to those if I keep having problems. Both coils had made in Mexico stickers on the bottom. :rolleyes: |
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