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-   -   24i/o speeds and hp (https://www.offshoreonly.com/forums/superboat/247777-24i-o-speeds-hp.html)

ndaniels 02-17-2011 12:30 AM

24i/o speeds and hp
 
What kind of speeds is everyone seeing outta 24s with what power? How fast is 550? 600? 650hp? If this has been done before, sorry but I didn't find it with a search.

I know that 500hp is right around high70s/low80s. Also, that a 24Pantera runs high 80s/low90s with 650. I figure the SB should be a little faster due to less weight... I'm lookin to find out what it takes to run mid 80s whenever conditions are right and am guessing it'd take 575hp to get it there easily any day- seem about right?

Stormrider 02-17-2011 08:40 AM


Originally Posted by ndaniels (Post 3328768)
What kind of speeds is everyone seeing outta 24s with what power? How fast is 550? 600? 650hp? If this has been done before, sorry but I didn't find it with a search.

I know that 500hp is right around high70s/low80s. Also, that a 24Pantera runs high 80s/low90s with 650. I figure the SB should be a little faster due to less weight... I'm lookin to find out what it takes to run mid 80s whenever conditions are right and am guessing it'd take 575hp to get it there easily any day- seem about right?

My 1995 24SE ran 74.8 w/ 560hp from JC.
Current owner claims 78. Who is running low 90s w/ 650?
How much HP is Tmone running?

Dave M 02-17-2011 11:21 AM

I was seeing 77-78 on most days with only 425 HP. I saw a 3-4 MPH increase with 40 HP after I repowered.

I would think 85 MPH w/550 HP is in the ballpark.

ndaniels 02-17-2011 12:14 PM


Originally Posted by Stormrider (Post 3328936)
My 1995 24SE ran 74.8 w/ 560hp from JC.
Current owner claims 78. Who is running low 90s w/ 650?
How much HP is Tmone running?

If I remember right, its Kirks old boat (now in MI, I think- forget who owns it). Not sure if it was a race, or pleasure?? I just remember talking about #s with him (he saw upper 80s out of it)


Originally Posted by Dave M (Post 3329084)
I was seeing 77-78 on most days with only 425 HP. I saw a 3-4 MPH increase with 40 HP after I repowered.

I would think 85 MPH w/550 HP is in the ballpark.

Yeah, that sounds about right. I was guessing that to do it every day, no matter the load, it'd take 575 with the straight bottom hull.

Pat McPherson 02-17-2011 08:39 PM

My 1997 24' Super ran 75mph with a best of 78 powered by a 415HP/502MagMPI.
T-Mone has a 509cube that dyno'd a bit over 600HP in his 24' Pantera. His boat tops out in the low 80s.
It takes a lot of HP to push these 24'X7' past 80; they kind of hit a wall around 80.

ndaniels 02-17-2011 11:34 PM


Originally Posted by Pat McPherson (Post 3329545)
My 1997 24' Super ran 75mph with a best of 78 powered by a 415HP/502MagMPI.
T-Mone has a 509cube that dyno'd a bit over 600HP in his 24' Pantera. His boat tops out in the low 80s.
It takes a lot of HP to push these 24'X7' past 80; they kind of hit a wall around 80.

So you're saying there is a flaw in my 575hp= 85mph thinking. :eek:I'm glad I brought this subject up... some good info so far.

Stormrider 02-18-2011 09:03 AM

Jeff Croppers brother had an older 24.
Claims it ran 102mph w/ 750hp 540.

There have definitely been a few threads about this subject in the SB and pantera forums.

ndaniels 02-18-2011 11:15 AM

I'd hate to build the motor with a particular speed in mind and come up short. Also didn't want to go alot bigger than I need to because of the bravo, but it sounds like overkill might be the best approach.


I've read about the 102 boat, but no specifics. Anyone have a clue about what drive was on it, or the setup? I remember asking about it a long time ago in another thread about the fastest in a 24, and this boat coming up.

rchevelle71 02-18-2011 11:37 AM


Originally Posted by Pat McPherson (Post 3329545)
My 1997 24' Super ran 75mph with a best of 78 powered by a 415HP/502MagMPI.
T-Mone has a 509cube that dyno'd a bit over 600HP in his 24' Pantera. His boat tops out in the low 80s.
It takes a lot of HP to push these 24'X7' past 80; they kind of hit a wall around 80.

Mine hit a wall at 60:eek: But it only has 250HP:evilb:

Dave M 02-18-2011 02:36 PM

I think anything over 85 in a 24 is just a bragging rights thing. Possible asking for trouble too.

The boat rides good and is very predictable between 55-65. So, for me, having enough motor to reliably cruise at those speeds and not be using a ton of fuel is where it is at. When conditions where right I could cruise at 60 @ 3800 RPMs. Now if I could of lowered that to 3400, it would of been ideal. That would also mean that my top end would of been somewhere between 80-85 based on a 5000 RPM max. I think a reliable 500HP that will run on 87 octane is perfect for the 24.

Mange 02-18-2011 06:42 PM

1 Attachment(s)
This is one of my old 24's and current owner runs close to 75mph with a 4 blade rolla cleaver. 496HO/425hp.

ndaniels 02-18-2011 09:22 PM


Originally Posted by Mange (Post 3330400)
This is one of my old 24's and current owner runs close to 75mph with a 4 blade rolla cleaver. 496HO/425hp.

Thats pretty fast for the hp.. race layup with no cabin?

Pat McPherson 02-23-2011 08:20 PM

I'm with Dave on this one. A 500HP/502cube engine is a good package for a 24X7.
I also had a 24' Pantera with a 330 and my Dad had a 24' Excaliber with a 400.
These are just not the fastest hull design. They do ride great for their size though in the rough.
You want to go real fast, keep that 21 and give that engine a little boost...

ndaniels 02-24-2011 10:37 AM

Not really looking to get the 24 moving crazy fast but mid 80s is moving in these hulls, no doubt. Currently upper 70s isn't a big deal, and thats with an old slopy worn out cable helm. I figure that I should be able to get into the 80s relatively safely with the improved steering.. little bigger tabs might help too.

I agree a 500hp motor that can run on 87octane would be the hot setup in these boats. I already run premium, though and am close to 500hp.. upper 70s leaves me wanting more and seems like this hull has some more left in it. Guess we'll find out. This 24 is also, most likely, going to end up being my only boat... got a couple of serious lookers on the 21 right now.

GRH 02-24-2011 12:38 PM


Originally Posted by ndaniels (Post 3334957)
This 24 is also, most likely, going to end up being my only boat... got a couple of serious lookers on the 21 right now.

bummer

ndaniels 02-24-2011 01:19 PM


Originally Posted by GRH (Post 3335054)
bummer

Its still is in my garage right now, though.:grinser010:

dba900 02-24-2011 03:27 PM

That 21 is a sweet boat and an unusual setup. Good luck with the sale!

ndaniels 03-03-2011 02:33 PM


Originally Posted by dba900 (Post 3335208)
That 21 is a sweet boat and an unusual setup. Good luck with the sale!

Thanks. It has been a tough decision whether or not to list it...


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