Top speed of 272 Islander with 496 HO?
 

I have looked at a number of 272 Islanders with the 496 HO. Every person that has one has a different GPS top speed. Most guys have a 23 pitch 3 blade. Anyone out there have a 272 Islander with a 496 HO that can give me an idea of the top speed they can run and what prop you are running?

Mag HO 425 HP ? should run mid 60"s

I'm looking at 1998 272 Islander with the 496 HO and I too thought it would run in mid 60's. Guy said it would only run 54 on his gps. He claims boat was just checked out by mechanic and everything is working great. It's exactly what I am looking for and priced right, but it's 15 hours away. Don't want to drive that far to find out something is wrong with the boat. Any suggestions to possibly see why the disparity in speed?

54?? Wow, that's slower than my slow boat!! I would guess low to mid 60s as well. I had a friend with the old Baja 270 and 502 carb. Boat ran 70 on the speedo so mid 60s on gps most likely.

old 270 with 502 carb runnign mid 60's... Im thinking more like high 50's maybe 60.

Lots of wind drag on the islanders my guess is 60 mph on the nuts... :) with the 23

For comparison Steve's 232 islander with 454 mpi (310 or 320 hp) runs 59 top end on light load, with low gas

My 265 with 502 mag efi only runs 55-56 on gps. with normal/heavy load.

Both of our boats are turning mirage plus 23/ How ever I sent my prop out to bblades this passed winter.. See it that will help me out on top end.

For reference, my 252 with a mildly built 454 (400hp) would turn 62mph on GPS, with a labbed 23p 3 blade. That was with a half tank in mild chop.

I replied to your other thread as I have real world experience with the exact combo your looking at.
My 272 islander (496ho) turning a 23 P prop will run 62 mph all day long but I once hit 64 mph, maybe I was going downhill???? Lol
I tried a 25 P prop but the only thing that changed was my rpms, mph stayed the same but rpms dropped a couple of hundred.

I didn't have an islander but 1995 272 with carbed 454, stock it went 54 with Mirage Plus 23, after many mods I could get it to creep over 60 with a 25 Mirage plus. The only thing the 25+ did was lower the RPMs like Tom272Baja already posted.

I don't know where you are but if he's 15 hours away, that may mean he's in a state with a much higher altitude and that crushes performance numbers. Growing up drag racing in Colorado was an exercise in humility comparing numbers to the sea level guys :)

The boat is in New Orleans. Tom272Baja, what RPM's were you running at with each prop? Were you running a 3 blade and what brand? Is that GPS speed with the 62 or is that what the speedo said? Sorry for all the questions, but I really want this deal to go through with this boat, but the fact that is will only hit 54 makes me a little nervous.

One more thing, what outdrive are you running?

Ok, I looked back on my notes, on the 25p prop I was spinning my rpms at 4700 and change, with my 23p prop I was spinning 5200 and a little.
Both props are mercury mirage plus 3 blades.
Outdrive is a bravo 1 with I think a 1.5 ratio.
Oh yeah this was all gps speeds.
One thing I would seriously look at on that boat, make dead sure that 496 is a true HO through and through, I'm not saying the guy selling it has done it but you can easily change the plastic engine cover from the standard 385 horse 496 to one that reads 496ho and sell it off at that.
Make double sure it's what you want.
But with that said it should be faster than 54

And one more thing, depending on what lake I'm on I'm either at 400' asl or a little over 700'
My fastest speed was recorded at 400'

Some brought it to my attention that maybe someone put a 496 HO motor cover on a 496 Mag. Anyone know how I can tell the difference between the HO and the Mag?

That should be at least a 60 mph boat.

My 272 (cuddy) with 385 hp 454 Mag runs 61-62 mph GPS with a Bravo 3.

Have access to a scan tool??

my 98 272 500 efi with a cuddy last year had a best speed of 70.9 gps that was with a 1/2 + tank of fuel and 2 guys running a labbed 25 mirage plus turning 5100 i also have 3 group 27 batteries ( 1 starting 2 stereo ) where as most only have 2 total so i have a little more weight than most

I'd have guessed it should hit low to mid 60's with the 496HO
To the op,
Don't let the low speeds scare you off if it's in good condition as you can always power up later
One of the members here has a 272 that's knocking the door on 100mph with big power.
See ya
Kelly

I have to agree with all the responses so far, my friend has a 275 with a 496 HO and it runs right with my Outlaw. 62-64 MPH all day long

I don't have access to a scan tool. If I could get my hands on one, would it tell what motor is in the boat?

Knocking the door on getting killed, LOL. Mine does a hair over 90, can't imagine 100!!! Arcticfriends has a very large sack

check the serial number of your engine shold be able to tell that way i would think

Yup,,,, its the first thing that comes up

OK. Thanks.

2002 252 Islander 496 mag (not HO) 23P mirage 60mph gps.

At 900 pony's and 90+ I'd guess "su tienes juevos grandes tambien"
Adios,
Kelly

An open cockpit boat is VERY windy at the speeds you to run. It's fine if your behind the windshield but it won't be pleasant for people sitting in the airstream.

Yep! Same setup here but running a B1 24p. I would think the 272 with HO would be a little faster so low 60's would be my guess. A 272 Islander would be one really neat boat. If it has been repowered with a 496 then what a nice find. Have him take it to a shop, get the engine scanned and send you the print. For all we know he just can't drive and keeps the bow buried.

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Ok I'll jump in on speeds. 2002 292 Islander 496HO B1X 1.5 gears. Best GPS speed in 90* weather and high humidity (typical summer LOTO day) is 52mph. 48mph with 8 people aboard GPS in the same weather. That said, the few times I use the boat before the summer heat humidity sets in (60*, cold water, low humdity), the boat knocks on 60mph. Going off what the boat GPS's in relation to the speedo, around 58mph.

Bottom line: I don't care. It's my family boat.

Interesting dash you've laid out. Can you post a pic of the whole panel?

Sure. Sorry for the hyjack but if you are looking at a 272 you may find this interesting also. I just added the radios on the port side this winter. The panels are either 11 gauge or 1/4 inch aluminum covered with 3M Di-Noc vinyl. Most medium to large cities have a LASER or water jet cutting service that will cut the panels for you reasonably cheap. I have a lot of the designs or templates for the panels (2001 model, may fit others as they say) if you want them.

And again I fell compelled to point out that a 272 Islander (or 292 Plowtown) is a pretty rare bird and are really neat rough water day boats. Good luck in your search or purchase and let us know what you find out.

Dan

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