2400 scr prop thoughts

[mmwjr]

Originally Posted by NickNick

Thanks! I will look into 4 bladed props. I’m not worried about speed, but I do want the engine to spin at the correct RPM while at full throttle. I think my engine is over propped a little and “lugging” a bit.
The highest RPM for my 96 2400 SCR is currently 4800. That is pretty low for the 5.7 liter engine.
Nicknick

Actually that rpm is exactly correct for the 5.7 in a marine application.

[donald]

Originally Posted by NickNick

Thanks! I will look into 4 bladed props. I’m not worried about speed, but I do want the engine to spin at the correct RPM while at full throttle. I think my engine is over propped a little and “lugging” a bit.
The highest RPM for my 96 2400 SCR is currently 4800. That is pretty low for the 5.7 liter engine.
Nicknick

Actually I think you are right in the max RPM for that engine. I have a 95 2400 with a 5.7 A1G2 4 barrel carb and it has a wide open RPM of 4800.
It came new with a 14.5x 17 prop.
I am running a 14.5x17 now and my max RPM is 4500, I have only had it there a couple of times as my wife and I like to keep the speed down and enjoy the ride.
Don

[viper12161]

I know this thread is a bit old...but djones....what size 4 blade prop did you get? I have the 5.0 Alpha 1 as well and having same issue getting up on plane. Wanted to go 4 blade, but wasn't sure what actual size to get.

Thanks!!!
Dave

[Ceemee]

Hello Dave, Well I tryed numerous props but the best one was a 15x15 Stainless Steel . I accidentally went to a 14x17 that my friend is wrong you may go down on the pitch but not the Diameter. Do not go under 15 Diameter. I really got lucky I contacted the Original owner he took very good care of the Boat before selling it to me. Mine was a 300 hp ( 350 mag mpi fuel injected ) Alpha Gen 2 . I was using a 15 3/4 x 17 SS . But I wanted it to plane out at lower speed why I looked into a 4 prop.. Well I’m disabled so about 2 months ago I had him pull it out of the water when he was traveling to the Boat Yard it fell off the trailer! Totally totaling the Boat ( cracked the lower unit brand new motor we put in and the Transom). But I just bought a New 2980 Regal we love it it’s fully loaded! I wish you the Best of luck … Charles

[jlasinski]

I have a SR2300 with the same motor and drive. It had a 14" X 20 4 blade on it when I got it and it ran pretty well. Just replaced it this last weekend as I hit something and took a chunk out of one blade. I replaced it with a 14 X 19 4 blade Nemesis prop. I only had 2 of us on the boat this weekend but it jumped right up on plane and ran close to 45 mph at 4600 rpm.