Alpha 1 vs. Bravo 1
RReed
I've been told that this combo may fail prematurely. Any thoughts?
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gblb
RReed <rr...@bst.wescam.com> a écrit dans le message :
Liwy3.14294$pO3.1...@c01read02-admin.service.talkway.com...
Russ Glindmeier, CFP
RReed wrote in message ...
>Looking at a boat that has a 7.4L Mag. but it has an Alpha 1 outdrive.
>I've been told that this combo may fail prematurely. Any thoughts?
>--
>Posted via Talkway - http://www.talkway.com
>Exchange ideas on practically anything (tm).
>
I seriously doubt that Mercruiser would have hung an Alpha behind that
engine. Boat must have been re-powered? The 7.4 Mag will eventually chew
up the Alpha. A Bravo is a must with that level of torque.
Russ
Russ Glindmeier, CFP
Russ Glindmeier, CFP wrote in message
<7qede0$7cr$1...@bgtnsc02.worldnet.att.net>...
re-powered, and the boat was originally equipped with an Alpha drive, it is
possible that the hull itself has been over-powered when the 7.4 Mag was
dropped in. Just speculation at this point, but worth checking out.
Russ
Max Allen, Bay Propeller Inc.
alpha does'nt have the gears or the ratio you need and you will be
limiting the boats true potentation.
Thank YOu,MAX
Bay Propeller Inc.
http://www.visi.net/bayprop/
Email bay...@visi.net
Phone 757 485 5681
On Mon, 30 Aug 1999 14:11:55 GMT, "RReed" <rr...@bst.wescam.com>
wrote:
Karl Denninger
That drive isn't beefy enough for the horsepower and torque you can get out
of the 7.4L Magnum (that's a 454 bigblock engine!)
Don't do it if you intend to actually USE that horsepower.
--
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In article <h9xy3.12804$ea.1...@news21.bellglobal.com>,
gblb <gb...@sympatico.ca> wrote:
>YEP!
>
>RReed <rr...@bst.wescam.com> a écrit dans le message :
>Liwy3.14294$pO3.1...@c01read02-admin.service.talkway.com...
Carl G. Craver
My advice would be to stay away from this package though.
The Alpha I drive was rated for 340 HP and the 7.4 liter put out 330 HP.
Do the math. It pushes the limits of this drive and I've seen too many of
them blown up. When I worked in a shop that did a lot of Mercruiser work,
we would not rebuild these drives, instead we bought new ones from
Merc because we wouldn't warranty them. We let Merc worry about the
warranty issue instead.
Carl G. Craver
Evinru...@home.com
Russ Glindmeier, CFP wrote in message
<7qee2e$9ta$1...@bgtnsc02.worldnet.att.net>...
>
>Russ Glindmeier, CFP wrote in message
><7qede0$7cr$1...@bgtnsc02.worldnet.att.net>...
>>
>>RReed wrote in message ...
>>>Looking at a boat that has a 7.4L Mag. but it has an Alpha 1 outdrive.
>>>I've been told that this combo may fail prematurely. Any thoughts?
>>>--
>>>Posted via Talkway - http://www.talkway.com
>>>Exchange ideas on practically anything (tm).
>>>
>>
Greg Page
wrote:
>Looking at a boat that has a 7.4L Mag. but it has an Alpha 1 outdrive.
>I've been told that this combo may fail prematurely. Any thoughts?
I had that combo on my Donzi, as twins. Ran it 6 years with no
problems. A single installation would be harder on the drive, but the
biggest factor is the operator. If it's a cruiser, should have no
problems. If it's an offshore boat, be sure you know how to throttle
back coming out on waves.
-Greg
Steve Galante
80's with Big Blocks. I know they had problems with the 454 Magnums.
Those were the OLD 330HP models. I'm not sure how Mercruiser rated
horesepower back then though. They did have some problems with the
Magnum drives. But, as I think back, has Mercruiser ever called one of
their Big Blocks a "7.4 Magnum" weren't they always called "454
Magnums", (I realize 7.4 Litres = 454 ci) But, usually Mercruiser
reserved the 7.4 Label for the NON-MAGNUM engines. I'm not an engine
guy, but some of the Old 7.4's put out less than 300 HP. The current
350 Magnum (300 HP) ships with a Alpha drive if you want it.. The
torque may be a problem with a Big Block, (I don't know how to determine
that) but as someone before said. If taken care of, the Alpha "may" be
alright to use.
--
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MuryMann
some sport boats. And I say "sport boats", not cruiser class boats. The drives
are geared typically 1.57:1 to 1.50 :1.
If you keep this, don't over-prop ( 21-23" pitch) to get more top-end speed.
Alphas are "speed" drives and all that torque through the powerband that the
7.4L cranks out can quickly fry your upper and.
I would also avoid using SS props on this. They don't flex like alum props and
the strain on your lower end can also cause premature failure.
BK
rm...@my-deja.com
Merc did pair the 7.4L ( 330 hp ) to an Alpha1 on
> some sport boats. And I say "sport boats", not cruiser class boats.
Sea Ray equipped 26 foot flybridge sedans with this package in the mid
80's (single engine). I also know a 1987 22' Donzi 2+3 that came from
the factory that way. I believe Merc stopped those packages when the
Bravo 1 came out in the late 80's. Bottom line: You can do it, but it's
not a very good idea, especially with a heavier boat.
Greg Page
I "thought" the 454 Mag/Alpha combo was always geared at 1.32:1 (and
used a special "supposedly" stronger gear set), I know mine were. Did
create some trouble finding good performance props at the required low
pitches, I ran Mach 4 blade 19".
-Greg
Michael J Porter
Russ Glindmeier, CFP <ru...@att.net> wrote:
=>
=>RReed wrote in message ...
=>>Looking at a boat that has a 7.4L Mag. but it has an Alpha 1 outdrive.
=>>I've been told that this combo may fail prematurely. Any thoughts?
=>>--
=>>Posted via Talkway - http://www.talkway.com
=>>Exchange ideas on practically anything (tm).
=>>
=>
=>I seriously doubt that Mercruiser would have hung an Alpha behind that
=>engine. Boat must have been re-powered? The 7.4 Mag will eventually chew
=>up the Alpha. A Bravo is a must with that level of torque.
=>
=>Russ
=>
=>
I've seen Formula 242 LS models rigged that way. I heard, and
perhaps incorrectly, that the Bravo wasn't available yet, and Merc
only offered TRS drives at that time. Boat was probably a mid to
late 80s model. Is this correct?
Mike
funhome
a Alpha drive but like it was stated before you must be very quick on the
throttle when coming out of the water, also they say if you upgrade your
motor in anyway you can kiss your alpha goodbye!
Brad at the FunHome
Michael J Porter wrote in message <7qh8pn$f9g$1...@copland.udel.edu>...