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1 Attachment(s)
Originally Posted by Bawana
(Post 4275917)
MT What was the AFR of the 10 71 blown motor? Some guys use fat AFR's to cool.
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Oh it was yours. Thanks Dan for posting dyno sheet. Did you leave the AFR's like that while in the boat? I run mine the same as you have ( 11.4 to 11.8), I think that Mike & Joe like AFR's a little fatter.
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i like them a little richer on the higher hp engines running more boost,the closer you get to the ragged edge the more it can use the xtra cooling.i have innercoolers but i am thinking about adding a water/meth system.
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ok..school me guys.... I get how water/meth works and why. My confusion comes from application. We are dealing with endurance motors in hostile environments. it can save a motor running on the edge but why would you want to run an offshore motor that far on the edge?? In a failure laden environment why would you want to add complexity with a pretty much assured catastrophic engine failure is something were to go wrong with the added complexity? We arent drag racing or blasting corner to corner, we are aiming for the horizon miles away. What am I missing?
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Originally Posted by Bawana
(Post 4275927)
Oh it was yours. Thanks Dan for posting dyno sheet. Did you leave the AFR's like that while in the boat? I run mine the same as you have ( 11.4 to 11.8), I think that Mike & Joe like AFR's a little fatter.
Normal cruise I'm around 12.0-12.4. I'm sure I could lean it back out, but I see no reason to. Slower speed and more chance of hurting something. Transom is always clean. That couple extra jet sizes isn't gonna wash the rings out of it at 5800rpm either. You should try a little more timing in your engines with a little more fuel this summer . if I remember you only running 28* total? It might pick up a little. I noticed with less timing and less fuel, was a slower boat. |
Originally Posted by phragle
(Post 4276000)
ok..school me guys.... I get how water/meth works and why. My confusion comes from application. We are dealing with endurance motors in hostile environments. it can save a motor running on the edge but why would you want to run an offshore motor that far on the edge?? In a failure laden environment why would you want to add complexity with a pretty much assured catastrophic engine failure is something were to go wrong with the added complexity? We arent drag racing or blasting corner to corner, we are aiming for the horizon miles away. What am I missing?
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Originally Posted by phragle
(Post 4276000)
ok..school me guys.... I get how water/meth works and why. My confusion comes from application. We are dealing with endurance motors in hostile environments. it can save a motor running on the edge but why would you want to run an offshore motor that far on the edge?? In a failure laden environment why would you want to add complexity with a pretty much assured catastrophic engine failure is something were to go wrong with the added complexity? We arent drag racing or blasting corner to corner, we are aiming for the horizon miles away. What am I missing?
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Originally Posted by MILD THUNDER
(Post 4276008)
I've ran everything from 11.2 to 12.5 at wot. Boat ran its best speed at 11.2. At 12.5 I cracked the porcelain on the plug.
Normal cruise I'm around 12.0-12.4. I'm sure I could lean it back out, but I see no reason to. Slower speed and more chance of hurting something. Transom is always clean. That couple extra jet sizes isn't gonna wash the rings out of it at 5800rpm either. You should try a little more timing in your engines with a little more fuel this summer . if I remember you only running 28* total? It might pick up a little. I noticed with less timing and less fuel, was a slower boat. |
Originally Posted by phragle
(Post 4276000)
ok..school me guys.... I get how water/meth works and why. My confusion comes from application. We are dealing with endurance motors in hostile environments. it can save a motor running on the edge but why would you want to run an offshore motor that far on the edge?? In a failure laden environment why would you want to add complexity with a pretty much assured catastrophic engine failure is something were to go wrong with the added complexity? We arent drag racing or blasting corner to corner, we are aiming for the horizon miles away. What am I missing?
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Theres 2 ways to do it, run meth (it`s like raising the octane to 116) and turn up boost accordingly or don`t do anything just run water to bring the intake temps way down and run it like extra insurance.
For me I`d need 4 nozzles per motor , have it come in @ 4-5 psi. That could be quite a bit of meth thats why i was thinking of running straight lake water and never run out. |
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