boss 272 help
 

I just picked up a 98 272 with a 502 mag mpi.. I just had the dist. Cap and rotor replaced ( old one had alot of corrosion).. yesterday I was running a stelleto turbo 23-4 blade and ran 4800rpm at about 65.. today I ran the mirage plus 23 3-blade and only hit 62mph & 4600 rpm.. weather was 95 and humid... Rough water.. can someone help me in the direction I need to go? I guess in confused why the 23-4 turned more rpm.. when I rode in the boat at purchase, it ran 64 with the 23.. any advise appreciated, thanks

I'm not familiar with the four blade you're running, or what you consider rough water, but the M+23 is a POS out of the box. It was prolly blowing out on you like a mofo.

It will however be a great all around prop if you get the proper tune on it from someone who knows the boat, like Brett. After the lab job I can turn it 4750ish at 66 in the heat.

I was wrong about that 23/4 it's not a steletto.. not really sure the brand.. It just has yellow stickers that say turbo... Anyway, I am considering the labbing of the prop but am also considering trying a mirage plus 22 4 blade.. Anyone tried one of these?

I feel your pain, but now I'm really going to mess you up.... I have a 99 272 with the 502, I'm running a Merc Turbo II 3 blade, 25p at 5400, avg. 67-69 on GPS and topping at 71. I think I'm going up to a 26/27p since I have the rpm's and try to pick up a few more. I have NO IDEA what is different, but she pops up on plane like a champ (unless she's really loaded down in the back with people) then settles on the pad and straight up runs. And she LOVES trim, rides with about 4' of boat left on the surface at just below half way on the gauge, quick bump up and you get a 35 foot rooster tail. :drink:

There is no such prop. Mirage props are "odd numbered" and are three blades. Bravo one you're thinking of maybe?

You sure your 502 is stock?

It should turn 5200 rpms....if it doesn't your prop is to big.

I wondered how you got 5400 with a 25p......the 35 foot rooster tail explains that

hook em, you're right, it's a bravo one 22 4blade... Any guesses what a a high five 24 would do?? ( I think its a 24 high five) I have one sittin around and am curious! probably blow out?

No, it won't blow out. But it will tear your drive up (sooner or later). That (5 blade) definately aint the prop for your boat.

All I'm saying is Bblades has a good tune/recipe for a M+ 23 on your boat. Call Brett and save yourself some time and money.

No. The HighFive is also odd numbered for the Alpha/Bravo/V-6 outboards. If you have one in 24", it's for the 75-125 outboards.

No it won't. This prop is tiny, less than 13½" in dia. Build for small outboard and Alpha boats. Because it's a 5 blade, does not mean it will break a drive, just like a Maximus won't break a drive on a boat with standard 496's ect. Besides, way wrong prop for this, as said. The best prop for the 272 is the M+. The B1 is a big wheel, and will slow you down, in this application, and the increased bow lift of the M+ is just what the 272 needs.

But yes, call Bblades. He's great with the Baja's.

It's a Turbo 2+2 prop.....really the wrong prop for your boat it is made for small boats and outboards. I had one on my 20 Outlaw and it worked great probably the best prop for that boat. Like other have said the M+ 3 blade is a good prop for speed and the 4 blade Rev 4 would be the better cruise prop.

http://www.boatownersworld.com/Props...us2_4blade.htm

Nope- she runs in the 5400 range at all times- tail/no tail. Here are a couple of shots that show how high she rides- and yes, as far as I know the 502 is completely stock.

http://farm6.static.flickr.com/5277/...000e7009_z.jpg
http://farm7.static.flickr.com/6051/...e64cf556_z.jpg

LanierBoss, is that all yellow, Boss graphic, Baja Hammer still running around up there?

I haven't seen it- the only Hammer I've seen on the south end is an all white with a really simple, swoopy, yellow and black graphic. But then again, I see at least 2-3 different/new boats just about every weekend!

I boated Cocktail Cove from 1998 to 2004. I sold my all yellow, Boss graphic '01 Hammer to a guy that lived on Lanier. I didn't want to ruin it by bringing down here to Florida. Nothing against the couple I sold it to, nice folks, I just wish I had never sold that boat. Left them my folks number and told them if they ever wanted out of it.... Just hoping they baby it as much as I did. Keep a look-out for me.

Back on topic for Taube. I ran a 23P High Five last weekend. It performed same as my 23P Laser II (much different prop than your Bravo I Prop, I run a SB motor) in all but top end speed and rpm. I could turn 400 more rpm and lost 1.9 mph compared to my Laser II. I'm following your thread with curiosity as I'm reproping as well and stuff is not adding up. Some items I have learned, the hard way mind you, is pay very close attention to prop diameter and cupping along the pitch and rake lines. The 4-blade I'm dialing in now behaved completely different with just tip-cupping added (cup along the rake lines). Those with more knowledge correct me if I'm wrong, adding cup along the rake line adds more rake, cupping along the pitch lines adds more pitch. AND, most importantly of all...make sure the blades are all "trued." If they're off even 1 degree you'll think that prop is no good when it very well may be. Keep us/me posted on your progress and I'll do the same for you.

Mine runs flat as hell compared to that:)

Kennyo, what prop are you running on your 272 ? I have 98 Boss with a 509 M3sc Procharger a XR with imco -2' shortie and running a stock 30 bravo prop. Not sure if this is the right prop for my set up.

Ok, I got a hold of a 22p 4blade bravo 1 this past weekend... I also fixed my fuel sender and found that I have had 3/4 to full tank of fuel with all this testing.. anyway the 22 brought my rpm's up to about 4800 and my speed was around 62.. that was with 2 people and 3/4 tank, cooler and gear.. I'm just under half tank now and will run this prop down to 1/4 tank to see speed and rpm.. my guess is it will be about 65 at 4900 to 5000 rpm.. then I will throw that stock 23 mirage plus on again.. I'm also gonna try the 23 4blade turbo prop again once the hub is replaced.. I ran 64 mph at 4800 rpm with that with 3 adults and probably just under half tank.. the weather has been low 90's and up to 70% humidity..

I'm running a labbed 30p bravo 4 blade. Hitting 88-89 @ 5700. I'm going to try a hydromotive 30 out of the box. I'm dying to crack 90! I may try a labbed 32 to drop my rpm's around 5600.

Nice boat. Saw it last weekend. I lost a few mph since the hot weather picked up. its still faster then the Houseboat! :evilb:

Mine looks like yours but I'm coming off a cruiser wake!

Kenny, call me if you need to borrow a labbed 32 to try or a stock 32 for that matter, I switched mine to 1.36's and am using all my little props this year, Smitty

I also run a 30 labbed 4 blade merc and a 32 labbed merc, I personally think drives last longer with labbed props then std ones, Smitty

You guys have some of the fastest stock 272's I have seen, I pizzed around with alot of things and never went over 65 even under the best conditions, My 272 (when it was stock) would barely hit 62 most of the time,:eek:, Smitty

I have a stock 30 bravo 4 blade. how much to lab? or should i buy one already done?

Call Brett a B-blades, although you might want to just buy one already done though as it will probably take 6 weeks to get one done and I doubt you want your prop gone 1/2 the summer, Smitty

thanks cabin fever.. It's nice to get off the houseboat and run with everyone... I don't think we'll get a lot of cooperation from the weather in the next month or so to run in clean cool air... This week is gonna be brutal!! which houseboat do you have? Split Decision here.. Also, I was talkin to JT today at the lake and says I should get back to that 23 mirage cuz the 22/4blade bravo is driving the nose down and I'm losing bow lift.... Last saturday, I ran down my buddies 29 outlaw sst 496 ho's and hung with him neck and neck but I was trimmed up a lot more with the 22/4 than I can the 23/3 mirage before it loses grip.... I think for now I may keep the 22 on to keep my rpm's up until the weather changes...

Will do Thanks. I'm assembling the engine this week. Hope to be back running next weekend.

I sold my houseboat a couple years ago, took the $$ from that, and sold my crownline, and bought the velocity. The houseboat was fun, but I got sick of going to the same lake every weekend. That, and I don't think my liver, marriage, or wallet could survive another summer like that. :evilb:

JT is definitly the man to talk to. I've picked his brain more then once. If it wasn't for him, I probably would have yanked the motor outta my boat by now, when I was chasing down problems last year.