Need some help here? At a loss...
#21
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Location: Olmsted Falls,Ohio Marblehead,Oh
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I say AFR 11.5 max and timing 30 total MAX.... I don't care what your doing in a car, the car don't run WOT for 10 minutes at a time....
If your blowing head gaskets there is lean issues.... period....lifting head or otherwise... use cometics and head studs to be safe, not always needed, but not a bad idea...
You can tune on the meth, but that's not smart as if it don't come on your screwed, I run meth in my Cobra on street with blower, but I tune as if its not there, I use it for safe zone...
of course it went faster leaning it out, always will, just not for long.... keep a blower boat engine safe and it will be fine!!!!
If your blowing head gaskets there is lean issues.... period....lifting head or otherwise... use cometics and head studs to be safe, not always needed, but not a bad idea...
You can tune on the meth, but that's not smart as if it don't come on your screwed, I run meth in my Cobra on street with blower, but I tune as if its not there, I use it for safe zone...
of course it went faster leaning it out, always will, just not for long.... keep a blower boat engine safe and it will be fine!!!!
#22
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Join Date: Feb 2010
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I'm sure it blew from extra volume of air over the M1. They were cheap del pro gaskets that were in there. I used cometics and head studs when I threw new afr heads on.
#23
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Stock intake... Smitty who has similar build said 34* is great. He runs m3 12lbs. I don't know cam spec. Does anyone know what Arizona speed and marines comp cam specs are. I'm a thinking it has weird duration split and blowing it out the exhaust. And all cylinders were leak down tested and compression tested. There's not very many hrs on this motor. Now FYI I have heard of a few people that have takin their 60mph N/A boats to Mead and they end up going 71mph and needing to reprop. I repeat Lakes around here are 6,000ft elevation. Strawberry is 9k (thin air) But still boat should be doing better then old combo. I'm thinking prop issue or camshaft issue. But just got a pulley today that should give me 3 more lbs of boost. Someone mentioned that the new prop could not be giving me good transit lift and diving my nose down. I dunno...
As far as your current problem, the obvious thing to do would be to try a 26 labbed prop and see what that yields, a dyno session would be next if its still slow and doesn't rpm and you cannot find anything else. I did not dyno my motor the last time I freshened it and I am regretting it now as I am missing some rpm's and speed on very top and it is very hard to get perfect and safe conditions to do testing/tuning to figure it out and I have wasted a lot of time chasing this crap. I will NEVER skip the dyno again as it is so much easier to see where you are at and solve these problems without having to buzz up and down the river at 100 mph while trying to find a problem without killing yourself or breaking stuff, Smitty
#24
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Sounds to me like all you upgrades are making the motor detonate and your loosing performance... You were ok leaning it out a bit but as soon as you put some compression in the motor you lost performance. An easy way to tell would be to slow down the blower and see if you pick up some performance.