Formula 271 owners,
 

what prop are you running, Ive gotta 93 271 with a 502mag trying to fit it with the right prop, came with a 21 mirage, spun at 5100, tried a 23 mirage spun at 5100, so far my speed is 57mph gps, I'm thinking a 23 mirage plus, anyone?

My 95 271 with a 502MPI and a 1.5 gear was delivered with a 21P solid hub Mirage. It would bounce off the rev limiter at WOT no matter the conditions or how much the girlfriend of the moment weighed. I bought a 22p Bravo and was happy enough with it to cease any more prop experimentation. Much better planing, turning, and cruise speed than the three blade, and would still touch the rev limiter light on fuel in a slight chop. If my handheld GPS was accurate, 63-64 was not uncommon.

As deep as the drive is, tweaking a three blade will probably get the most mile per hour. But the 3500-4000 cruise speed is where the four blade won me over.

hmm well thats the most info Ive gotten so far with that said would I be correct in assuming the rev limiter is 5100?? and when I search for a prop I want to ask for a,
"bravo 22p 4blade" ???
thanks
Sam

Please triple check me, but part # 831910A55 should be a right hand rotation 22 pitch Bravo One propeller with a 1 inch hub kit. That is the propeller I was happiest with. Your results may vary, so don't be upset if your opinion is different. I am at sea level and boat in brackish water in a river with a current. My engine may have been weaker/stronger, my boat lighter/heavier, my bottom straighter/more warped. This also assumes your drive (that has a 1 inch propshaft and 1.50 ratio) spins clockwise going forward and you have a 502 mag efi/mpi. Not a carbureted 502 mag.

My memory fails me but i think the limiter is 5050 on the 502 efi/mpi.

well I guess the only differance is mine is carbed not efi, what horse is yours rated at?

All of the 502 mag efi/mpi were 415.

I have a 1995 271 SR1 w/502 EFI Bravo 1 w/1.5 Ratio and the prior owner included the Feb. 1996 issue of Powerboat Magazine which tested this identical boat and they came up with their recommendation for best prop as being the Mirage Plus 3 Blade Stainless Propeller 14 5/8 x 23P Part# 48-13704A46. It was a pretty interesting article and it's just one opinion that was nice to see in print but of course, everyone has their own opinion. btw, they were testing the 271 off the Ventura Coast, Ca.

thanks 271, need to get some weather to go out and run one

very welcome, I just need time to take mine out for the first run-the weather here in So Cal is awesome right now. I have a 4 blade mirage 24P on it and I've been looking for a good used prop like the one in the article-at least to have as a spare.

Had my buddys 271 out yesterday, we were trying to check out prop speeds, we did not have a GPS on hand (dead batteries) but we saw 5100 totally trimmed out, that seemed about right, he has the 496, I am not sure if it is a 365 hp or 385 hp, it is a indy also, he wanted to go bigger prop but I think he is right where he is, 21P Mirage plus now..

Sound like the right WOT rpm?

496ci are 375 or 425 / 365 or 385 would be 454ci

I have read this post many times and have check my paper work on my boat which is a 2000/ 271 was a 502-415hp it came with a 26p left hand prop it top out at 63.7 gps @5100 when it got lab I hit 65 gps hope this helps . good luck to all !:cool-smiley-027:

left hand prop? I would be completely happy with them numbers but I wonder how much of that is due to the newer Fastech hull??

I have a stock B1 with a labbed (some cup) 24P, behind a stock 496HO (425 hp). With one person on board, 1/2 tank fuel in light chop at 4600 WOT, I get 62 mph (non GPS).