How does 275HP sound?

How does 275HP sound?

Post by Dave » Mon, 17 Feb 2003 10:37:55


I attended the Miami Boat Show the other day and was disappointed to find
only Natique and Mastercraft booths - a sign of the times.

The best part (besides of course the Fountain and Cigarette displays) was
that all the engine guys were there: Indmar, PCM, Mercruiser, even GM
Vortec.  I got into conversations with each of them to find out when the
5.7L would go away and what it would be replaced by.  Interestingly, it
doesn't look like those of us with the "old" block will be in a minority
anytime soon.  The likely successor, 6.0L, is several hundred dollars more
and requires fresh water cooling to ensure the aluminum heads don't corrode.
However, unlike the Ford 5.8L/351, GM is still building large volumes of
5.7L in Mexico and shipping to many foreign countries, even though they have
discontinued selling it in US vehicles.  The manufacturing equipment is well
amortized, manufacturing efficiencies are high, labor cost is low -- in
other words the cost is about as good as it gets.

I was a bit dissappointed that there wasn't some wonderful engine on the
horizon that would be lighter, better fuel economy, less polution, etc.
With Ford and Toyota out of the market and no plans from any of the Japanese
manufacturers (Yamaha, Honda, Suzuki all said no), we are stuck with GM and
their age-old waterfall strategy of waiting ~10 years before taking anything
into a marine environment.  What's wrong with that?

In the interest of innovation, how about taking GM's 4.2L I6 that puts out
an honest 275 hp and throwing that into a ski boat?  I don't remember how
much bonus HP you get by taking off all the automotive accessories but with
that bump and maybe a little engine work, we might be able to get ~300hp out
of it.  With Perfect Pass almost standard for tourney boats, it would just
squeeze the throttle a little harder than, say a 335HP monster.  If done
right, the skier couldn't tell the difference between 6L, 5.7L, and 4.2L.
Another big plus would be the extra room inside the boat as a result of
dropping the V8 engine width in favor of inline 6.  Some folks might
remember that an inline 6 four stroke engine is a natural harmonic meaning
vibration and noise is better.  Not to mention the weight savings.

            5.7L                4.2L
HP    255                    275
Torque 330 at 2800    275 at 3600RPM
Material    Cast Iron    Aluminum
Weight      600+            407 lbs
Design    2 OHV         DOHC & Variable Valve Timing

Is this idea amusing to anyone else?

Dave

 
 
 

How does 275HP sound?

Post by Doug Meredit » Mon, 17 Feb 2003 13:51:17


Quote:
> In the interest of innovation, how about taking GM's 4.2L I6 that puts
out
> an honest 275 hp and throwing that into a ski boat?  I don't remember
how
> much bonus HP you get by taking off all the automotive accessories but
with
> that bump and maybe a little engine work, we might be able to get
~300hp out
> of it.

Too easy to get 350-385 HP out of a V-8 with out any real work.

Quote:
> Another big plus would be the extra room inside the boat as a result
of
> dropping the V8 engine width in favor of inline 6.

You forgetting that you would have an engine that is 2 cylinders longer?

Quote:
>             5.7L                4.2L
> HP    255                    275
> Torque 330 at 2800    275 at 3600RPM
> Material    Cast Iron    Aluminum
> Weight      600+            407 lbs
> Design    2 OHV         DOHC & Variable Valve Timing


http://www.gm.com/automotive/gmpowertrain/engines/vortec/apps/marine/57s
pecs.htm

 
 
 

How does 275HP sound?

Post by ppoin.. » Wed, 19 Feb 2003 02:21:42

Quote:

>             5.7L                4.2L
> HP    255                    275
> Torque 330 at 2800    275 at 3600RPM
> Material    Cast Iron    Aluminum
> Weight      600+            407 lbs
> Design    2 OHV         DOHC & Variable Valve Timing

I'd have to try before buy.  For a short setup like where I ski, gobs of torque
are required in order to have the boat up to speed prior to the 55 meter balls.

 
 
 

How does 275HP sound?

Post by Jim Thomps » Wed, 19 Feb 2003 03:58:08

Quote:

> In the interest of innovation, how about taking GM's 4.2L I6 that puts out
> an honest 275 hp and throwing that into a ski boat?  I don't remember how
> much bonus HP you get by taking off all the automotive accessories but with
> that bump and maybe a little engine work, we might be able to get ~300hp out
> of it.  With Perfect Pass almost standard for tourney boats, it would just
> squeeze the throttle a little harder than, say a 335HP monster.  If done
> right, the skier couldn't tell the difference between 6L, 5.7L, and 4.2L.

I've skied a bunch behind a MC that has 305ci / 265HP.  If you set the KX on
PP right I get the same feel as my 325HP Malibu.
 
 
 

How does 275HP sound?

Post by Dave » Thu, 20 Feb 2003 09:01:57

I'm with you Jim.  I skied a MC w/ 305 and couldn't tell the difference.

I'll look into the length of the engine to see if it is prohibitive.

Still, this is probably just a pipe dream -- telling GM to marinize an
engine would be like stringing two cans together between this newsgroup and
the factory :)

DAve


Quote:

was a

> > In the interest of innovation, how about taking GM's 4.2L I6 that puts
out
> > an honest 275 hp and throwing that into a ski boat?  I don't remember
how
> > much bonus HP you get by taking off all the automotive accessories but
with
> > that bump and maybe a little engine work, we might be able to get ~300hp
out
> > of it.  With Perfect Pass almost standard for tourney boats, it would
just
> > squeeze the throttle a little harder than, say a 335HP monster.  If done
> > right, the skier couldn't tell the difference between 6L, 5.7L, and
4.2L.

> I've skied a bunch behind a MC that has 305ci / 265HP.  If you set the KX
on
> PP right I get the same feel as my 325HP Malibu.