"I know this is going to be lo
"I know this is going to be long, but I need to catch you up so you know what I know.
My wife and I just bought a Formula 280 BR with twin 5.7Gsi's and DP-S drives. We bought it pretty cheap, so we weren't worried too much about things needing to be done on it. We also understood that because it was used in salt water that there would be some corrosion issues to deal with; I don't beleive it was actually kept in the water as things look pretty good, and it still has a super good looking white bottom - my thoughts, it must have been lifted.
Anyway, during the water test when completing the sale I noticed the wide open throttle RPMs were only 4000-4200 on both motors. Some other things I noticed was that it seemed to idle rougher than my father's boat with a 350 mercruiser, and it would occassionally miss when cruising. Since I attributed the ocassional missing to bad plugs/rotor/cap/wires, and hoped the slower rpms would disappear as well, I already changed a the plugs/wires/rotor/cap. However, running the engines on a hose I think I still hear missing every once in a while. The boat isn't under load, so I'd expect the missing to be worse if I actually could take it out. To be honest though I didn't regap the plugs, since I didn't have anything at the time to tell me what the proper gap should be. Anyway, I haven't been able to get it back in the water to see if things are somewhat better yet.
While tearing into things a bit more I found the infamous salt water rust on the risers and manifolds. These have been ordered, but don't have them yet to isntall. Meanwhile I have run multiple compression tests on both engines and am very pleased with the results. On the starboard engine all cylinders ran 190-200psi, whereas the port engine ran 190-200 on all but two cylinders. The remaining two cylinders ran 150 and 160. I think the exhaust valves have some surface rust because the related riser and manifold were in the worst shape of the four sets and exhibited quite a bit of rust trailing down the ports. The engines both have about 350 hours on them.
The thing that is most interesting to me is that they both seem to run about the same, and didn't approach the WOT as stated on the sticker on the top of the intake cover.
Does anyone have any ideas? Does anyone think that the risers all clogged up with rust would also limit my RPMs because of constricting the exhaust, or even constricting the water jackets such that any safety measures within the ECU were activated?
I appreciate it if you made it this far, but I think I've told you what I know."
"I know this is going to be long, but I need to catch you up so you know what I know.
My wife and I just bought a Formula 280 BR with twin 5.7Gsi's and DP-S drives. We bought it pretty cheap, so we weren't worried too much about things needing to be done on it. We also understood that because it was used in salt water that there would be some corrosion issues to deal with; I don't beleive it was actually kept in the water as things look pretty good, and it still has a super good looking white bottom - my thoughts, it must have been lifted.
Anyway, during the water test when completing the sale I noticed the wide open throttle RPMs were only 4000-4200 on both motors. Some other things I noticed was that it seemed to idle rougher than my father's boat with a 350 mercruiser, and it would occassionally miss when cruising. Since I attributed the ocassional missing to bad plugs/rotor/cap/wires, and hoped the slower rpms would disappear as well, I already changed a the plugs/wires/rotor/cap. However, running the engines on a hose I think I still hear missing every once in a while. The boat isn't under load, so I'd expect the missing to be worse if I actually could take it out. To be honest though I didn't regap the plugs, since I didn't have anything at the time to tell me what the proper gap should be. Anyway, I haven't been able to get it back in the water to see if things are somewhat better yet.
While tearing into things a bit more I found the infamous salt water rust on the risers and manifolds. These have been ordered, but don't have them yet to isntall. Meanwhile I have run multiple compression tests on both engines and am very pleased with the results. On the starboard engine all cylinders ran 190-200psi, whereas the port engine ran 190-200 on all but two cylinders. The remaining two cylinders ran 150 and 160. I think the exhaust valves have some surface rust because the related riser and manifold were in the worst shape of the four sets and exhibited quite a bit of rust trailing down the ports. The engines both have about 350 hours on them.
The thing that is most interesting to me is that they both seem to run about the same, and didn't approach the WOT as stated on the sticker on the top of the intake cover.
Does anyone have any ideas? Does anyone think that the risers all clogged up with rust would also limit my RPMs because of constricting the exhaust, or even constricting the water jackets such that any safety measures within the ECU were activated?
I appreciate it if you made it this far, but I think I've told you what I know."