shilo
New Member
Just wanting to know what I should expect as a top speed for a 1990 220 CC with a 260hp 5.7 merc with Alpha? The reason why I am asking is because I was out today with a GPS to check top speed and was surprised to find I was only running 36mph @ 4500rpm WOT. The prop is probably the original prop that came with the boat. Not sure if it is a Black Max, but it is an aluminum 3 blade 17 pitch in good shape. Sea Ray's prop chart calls for a 14.5"x 17. The boat is a large 22' ; 23'8" OAL with an 8'6" beam. The specs say it weighs 3500lbs, but I think it is heavier. I did notice that at 4000rpm I was running 30 or 32mph. It seemed like the last 500rpms really didn't add much speed and kind of sounded like the prop really wasn't grabbing the water well. WOT was only for 3 or 4 minutes max just to check performance. The trim tabs were full up and the outdrive was trimmed slightly up. I had expected to run 40 to 45mph. So, what should I expect out of this boat? Is 36mph about right as a max or is this the prop?