[W126 Coupe] Engines

[Sharan Bains]

Yes, absolutely, you can extract plenty of power without supercharging !

Just look at the latest engine released by AMG.... 6.2 litre (labelled 6.3) 
NORMALLY aspirated V8 and shoves out 510hp and more importantly 630 NM of 
torque !!!! And that's the most crucial statistic, torque. If you compare to 
boxing, bhp is about how FAST you can punch...torque is about how HARD you 
can punch !

Now the 5.6 isn't too far off in terms of displacement - the increased 
displacement mainly provides more torque.

This latest engine gets it's massive power from a high compression ratio of  
11.3:1....that's almost like having a US spec 9:1 compression 5.6 M117 
running at 10 psi boost ! And then the sophisticated fuel and ignition 
control units maximise the power further.

Supercharging is fine and works well if you don't want to get technical and 
want easy bolt on power. And the power gains are big....more than you'd gain 
from a normally aspirated M117.

But if you're prepared to get involved, then get down to the bare M117 and 
work from there...higher lift cams, revised pistons, unpgraded injection and 
ignition control systems, revise the exhaust manifolds etc etc...you'll have 
a super engine with plenty of power. And one that will have longevity, 
smoother and more responsive, without the detonation risk that a forced 
induction engine carries.

All I did with my Euro 560 was change the camshafts to AMG spec ones - and 
the performance increase was very significant. I'd say in the 20-30hp range, 
with ease....and those cams do make a real difference in the Euro engines. I 
fI ever find a set of AMG spec pistons, I'll be well chuffed ....

Do the Aussie spec SEC's have an even lower compression ratio of 8:1 ? 
They'd be PERFECT for turbocharging, provided an intercooler is worked into 
the process.


talbir








>From: David Fatovic <coloradocroat at yahoo.com>
>Reply-To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
>To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
>Subject: Re: [W126 Coupe] Engines
>Date: Mon, 18 Jul 2005 10:26:12 -0700 (PDT)
>
>So once you strip off all the control stuff, you have
>an engine to do whatever you want with it correct?
>Somewhat?  I feel you can get much more horsepower out
>of the engine other ways than supercharging it.
>
>Thanks,
>
>David
>
>--- Jim Nowak <jjnowak_32503 at yahoo.com> wrote:
>
> > David, that is correct.  I'm looking to do that to
> > my
> > SEC and I already did it to my porsche 928.
> >
> > Jim
> >
> > --- David Fatovic <coloradocroat at yahoo.com> wrote:
> >
> > > I have a question.  An engine is an engine is an
> > > engine once you strip off the controls right?  So
> > is
> > > it possible to take a 560 engine from a 91 and
> > strip
> > > off the the vacuum controls and the mechanical
> > fuel
> > > injection, basically get down to the bare engine.
> > > Then build up the 5.6L to have new fuel
> > management,
> > > new air intake etc.
> > >
> > > Also what is the latest MB tranny (year) that you
> > > can
> > > mate to the M117 engine?  I would think that the
> > > later
> > > trannys would work better, better gearing and 5
> > > total
> > > gears too.
> > >
> > > Any ideas?
> > >
> > > David
> > > The MB Coupes Website!
> > > W126 SEC Mailing List
> > > Postings remain property of MB Coupes, L.L.C.
> > >
> >
> > The MB Coupes Website!
> > W126 SEC Mailing List
> > Postings remain property of MB Coupes, L.L.C.
> >
>
>The MB Coupes Website!
>W126 SEC Mailing List
>Postings remain property of MB Coupes, L.L.C.