Formula 223 Prop Help? 23p to a 21p?
#1
Registered
Thread Starter
Join Date: Jul 2016
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
Formula 223 Prop Help? 23p to a 21p?
Hey guys, so ive been doing a bit of research and decided to make a thread for help. Ive got an 88' Formula 223LS with the 454/330 bravo 1. I purchased the boat from an older guy in long island, he told me bottom end was stock, but heads were done and have roller rockers/cam set up. I just put in new EMI thunder manifolds on it etc. The engine runs strong, fires right up, idles smooth etc. When i first got the boat it has a PTProp 23p 4 blade on it. When i first put it in the water it was a DOG, took forever to plane out, then top speed was terrible in low 40's. The owner had given me an extra prop with the the boat that i switched on, this one is a Mirage 23p 3 blade which made the overall performance night and day difference over the 4 blade. The top speed ive gotten with this prop was 53mph at 4800rpm and starting to throw a bit of a rooster tail. I still feel like the boat should be more responsive down low as it still feels pretty sluggish. These runs were done with 2 people onboard along with 1/2 tank of fuel. I have been debating trying a Mirage Plus 21p 3 blade but wanted to get some feedback from you guys first. I know every boat and set up is different but if anyone has any positive feedback to help pick the proper propeller for the boat id greatly appreciate it. Thanks!
#2
Registered
My son has a 1988 Formula 223. We recently put a new engine in and went through the customary prop adventure to find that perfect setup. The engine way dyno'ed at 509 hp (@5200 rpm) and 556 ft-lbs torque (@ 4400 rpm). We were prop'ing it for skiing, so we ended up with a 21 pitch Mercury Revolution 4 blade. It can pull two ~260 lb skiers out of the water with two people in the boat and a full tank of gas. We tried a 23 pitch and 25 pitch Mirage Plus, but didn't have the hole shot he was looking for. Not sure if this is close enough for a comparison, but information on the same hull.
#3
Registered
Thread Starter
Join Date: Jul 2016
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
Thank you Sonic! that is helpful, I actually just found a quicksilver 21p 3 blade prop on Craigslist nearby for 180 bucks. The guy said it was on a 26ft checkmate. I may grab it but I haven't decided yet still want to do some more research. I'm not using the boat for skiing or anything specific, I just like to bomb down the river from time to time and want some good pick up and top end without feeling like I'm taking forever to jump on plane .
#4
Registered
Where is your exhaust exit, thru hall/ silent thunder platform or through the prop. If it's through the prop are thereally 3 plastic plugs in you mirage? If they are remove them that will help the engine Rev to get the power up to get on plane. I think a 21p 3 blade will be to small and will bring your rpm up to high at full throttle. If you want a better hole shot and still close to the same top end I would go with the 21p Rev 4. It supposed to be close to the mirage with the added benefit of the 4 blade.