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06-11-2009, 08:33 PM
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#1
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Registered
Join Date: Jan 2006
Location: Royal Oak, MI
Posts: 1,281
28 Powerplay - HP500
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28 Speeds
What does a 28 run with the various engines? I've tried searching and haven't found much.
For example,
A single 500 hp vs 502 twins, etc.
What's it take to run 70, 80 in a single or twins.
Thanks.
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06-11-2009, 09:42 PM
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#2
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Registered
Join Date: Jan 2004
Location: maryland
Posts: 192
powerplays 28 and 33
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I have a 1998 28 that had a single 509 blown 725 hp bravo one 1.5 spinning a herring 5 blade
top out at 5400rpm 87mph.
The blown motor has been replaced by a new 502 with similar specs a hp500 with a litlle bigger cam, approx. 550hp.
We have not splashed it but beleive that it should run approx 75-78 and get great fuel mileage
I have been a 28 with twins and it did not ride as well and topped out at 78....stock 502 mpi....too much wait for the length and the drives ride way too high.
this of course is with i/o
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06-11-2009, 09:46 PM
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#3
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Platinum Member
 Platinum Member
Join Date: Apr 2001
Location: East Coast
Posts: 2,600
1985 22' Velocity, 2001 Powerplay 33', 2003 38 Powerplay
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My 28 with twin 300 promax's runs 80
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06-12-2009, 03:40 PM
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#4
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Registered
Join Date: Jan 2006
Location: Royal Oak, MI
Posts: 1,281
28 Powerplay - HP500
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Thanks guys.
So it seems that 500 hp will break 70?
Also, twin big blocks are too rear-heavy then and a big single is best (or outoards if that's your deal  )?
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06-15-2009, 08:40 PM
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#5
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Registered
Join Date: Jan 2006
Location: Royal Oak, MI
Posts: 1,281
28 Powerplay - HP500
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Quote:
Originally Posted by daredevil
I would say a nice 650 HP BB ,,should get u in the mid 80's easy.
The one that raced back in 98ish did almost 95 !!!  |
That sounds pretty good.
So nobody knows though what a single HP500 will run?
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06-16-2009, 05:25 PM
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#6
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Registered
Join Date: Jan 2006
Location: Royal Oak, MI
Posts: 1,281
28 Powerplay - HP500
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Quote:
Originally Posted by daredevil
U should be in the mid 80's for shure !!!!
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Sounds optimistic....but I like it. 
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06-16-2009, 07:42 PM
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#7
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Registered
Join Date: Jan 2006
Location: Royal Oak, MI
Posts: 1,281
28 Powerplay - HP500
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Quote:
Originally Posted by daredevil
It should do it ,,,with the right prop and maybe a shortry,,or extension box !!! 80-85,,the boat is not that heavy.
My old 33 was ~ 6400 # with twin BB and Imco's,fully loaded
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If I get this boat I'm looking at it has no external hydraulic steering, so I might go for an exension box (they can have internal hyd seering right?). Otherwise I agree it shouldn't be too heavy at all, pretty light on the amenities.
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06-16-2009, 08:59 PM
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#8
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Registered
Join Date: Jan 2006
Location: Royal Oak, MI
Posts: 1,281
28 Powerplay - HP500
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Quote:
Originally Posted by daredevil
NO,,,outside Hydraulic is what u need for extension box and otherwise !!!!
Its easy to install and...... well ~2500 + or used for less. |
Oops, OK.
I'm thinking it'll be a worthwile upgrade....but first things first I gotta close the deal and get the boat "home". 
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06-17-2009, 07:51 AM
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#9
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Platinum Member
Platinum Member
Join Date: Jan 2006
Location: Stratford, CT
Posts: 2,901
2005 Active Thunder 28
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My 28 AT runs 72 w/a 525. I seriously doubt a single 500 will run over 80.
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06-17-2009, 10:11 AM
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#10
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Registered
Join Date: Jan 2004
Location: maryland
Posts: 192
powerplays 28 and 33
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everyday getting a little closer to putting this 502 approx 550 hp in my 28
I will keep you posted on end speed. hoping for 75-80 tops
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