I would think your AFRs would be alittle rich in the heat and humidity of summer . Those wide bands are a good broad range tuning tool . But they still just average 4 cylinders together . If you've ever seen a dyno run with 8 O2s in the headers , The cylinders will be all over . Ive seen them as much as 2 full points apart. So if you have one at 11.0 and one at 13.0. Your single widebands are still saying 12. If your AFs drop below 11.0 your overrich from my experience. One fat cylinder can drop 50-75 hp.
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Right I get that but it's all I got to go by, sure is easier then reading plugs! Lol
Originally Posted by dunnitagain
(Post 4470902)
I would think your AFRs would be alittle rich in the heat and humidity of summer . Those wide bands are a good broad range tuning tool . But they still just average 4 cylinders together . If you've ever seen a dyno run with 8 O2s in the headers , The cylinders will be all over . Ive seen them as much as 2 full points apart. So if you have one at 11.0 and one at 13.0. Your single widebands are still saying 12. If your AFs drop below 11.0 your overrich from my experience. One fat cylinder can drop 50-75 hp.
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Originally Posted by dunnitagain
(Post 4470902)
I would think your AFRs would be alittle rich in the heat and humidity of summer . Those wide bands are a good broad range tuning tool . But they still just average 4 cylinders together . If you've ever seen a dyno run with 8 O2s in the headers , The cylinders will be all over . Ive seen them as much as 2 full points apart. So if you have one at 11.0 and one at 13.0. Your single widebands are still saying 12. If your AFs drop below 11.0 your overrich from my experience. One fat cylinder can drop 50-75 hp.
In a nutshell wideband is an awesome tuning tool as you mentioned while plug checks tell the tale. That's where staggered jetting can help achieve get where you need to be. Mean time OP had a good weekend. Suckin gas and haulin azz. Best feeling in the world. |
So where did your final jetting and PV end up? Are the motors jetted the same or less on one?
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Starboard engine is jetted 90P/95S port is 88P/91S, both have 4.5 PV, now show nearly identical air fuels, both rpm equal also. big difference in jetting on carbs but I was also told not all carbs created equal, as long as air fuels look good it don't bother me.
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I don't know if this has been covered yet, but when was the last time you cleaned your flame arrestors? Mine appeared clean, but I pulled them and I gained 8 MPH. Every time I would go out in the boat I would go slower. I was down to 72 with the new props, I was like WTH. I stopped pulled the arrestors and back to 80. Put them back on, back to 72. If you haven't done it, clean them. It might be your issue!
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found issue, read back a little lol
as far as arrestors, they are not much there, only 2 windings, not dirty.... I took out a lot of windings to not restrict, still wanna run boat once without them to see if I can gain even more speed or rpm...
Originally Posted by endeavour32
(Post 4471408)
I don't know if this has been covered yet, but when was the last time you cleaned your flame arrestors? Mine appeared clean, but I pulled them and I gained 8 MPH. Every time I would go out in the boat I would go slower. I was down to 72 with the new props, I was like WTH. I stopped pulled the arrestors and back to 80. Put them back on, back to 72. If you haven't done it, clean them. It might be your issue!
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So it was just a bad coil. At least it was a simple fix once you found it.
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Originally Posted by endeavour32
(Post 4471411)
So it was just a bad coil. At least it was a simple fix once you found it.
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Originally Posted by Full Force
(Post 4471409)
found issue, read back a little lol
as far as arrestors, they are not much there, only 2 windings, not dirty.... I took out a lot of windings to not restrict, still wanna run boat once without them to see if I can gain even more speed or rpm... |
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