[Shotimes] (OT) Marauder

Mon, 4 Nov 2002 00:33:25 -0600

     Actually there are plenty of of 4 valve OHV motors around.  You do not
need to squeeze extra lobes on the cam either.  All of the pushrod OHV 4
valve engines that I have seen have fingers in the heads that operate both
intake valves off of one pushrod.  This is very similar to how SOHC 16V 4
bangers operate.

     Also Yamaha didn't have the advances that we have now when they were
designing this motor.  Keep in mind that the motor was designed 17 years
ago!  That's amazing when you think about it.  They were waaaaay ahead of
their time.  I digress though.  Hydraulic tappets were not used for fear of
high RPM oil foaming which would have caused them to collapse.

~ Mike
----- Original Message -----
From: "David P" <jpotter8@bellsouth.net>
To: <dmall@mwonline.net>; <shotimes-admin@autox.team.net>
Cc: <shotimes@autox.team.net>
Sent: Sunday, November 03, 2002 11:20 PM
Subject: Re: [Shotimes] (OT) Marauder


> Since all OHV motors are two-valvers, and four valves allow more efficient
> combustions, then pushrods DO have a bit to do with emissions, at least
> until they figure out a way to cram 4V onto a single cam. Sure, injector
> placement, intake flow, etc play a large part, but when considering solely
> 2V vs. 4V, 4V is going to win on emissions and power. You think maybe
there
> is another reason why the Corvette runs a 2.73 final?
>
> As for OHC being high maintenance, I think you are forgetting that the SHO
> does not have a hydraulic tappet. Remove the hydraulic tappet from any OHV
> motor and it becomes just as maintenance intense. Not as expensive to
build,
> but just as expensive to maintain. If Yamaha had inserted hydraulic
tappets
> into their design, we would not be sitting here exclaiming the need to do
> the 60k on time.
>
> Sure, the small block (or more specifically, the OHV design) will be
around
> for some time, but eventually it will be dropped in lieu of more efficient
> designs in our nation's quest for emissions reduction. Don't get upset
about
> it though, as OHC's days are numbered as well. There are much better
> air/fuel injections systems on the boards and in testing that don't have
> valves as we conceive them that will see fruition in the last half of this
> century, leaving OHV as the predominant valve design of the 19th, 20th and
> 21st centuries. Not too bad a run, but definitely a technology that has
> outlived it's usefulness.
>
>
> David P
>
> 95MTX
>
>
>
> ~
> ----- Original Message -----
> From: "Donald Mallinson" <dmall@mwonline.net>
> To: <shotimes-admin@autox.team.net>
> Cc: <shotimes@autox.team.net>
> Sent: Saturday, November 02, 2002 16:24
> Subject: Re: [Shotimes] (OT) Marauder
>
>
> > Yes production was low, although that is what you said, not
> > i.  They also sold every one they made, and even ramped up
> > production and held it longer than planned to try to meet
> > demand.  You expected maybe they would sell them in Focus of
> > Camry numbers?  NO special vehicle sells in big numbers,
> > Cobra, RX7 etc.  But they did sell a lot of the basic
> > Caprice, a great tow vehicle and very good police car that
> > the police across the nation still lament not being able to
> > get.  They have never warmed up to the low torque and low HP
> > "High tech" Crown Vic.
> >
> > High emissions?  Not really, the small block chevy lives on
> > in the Vette and a huge amount of other applications as a
> > low emissions vehicle!   And don't spout the "low tech"
> > pushrod cam mantra.  The motor works and puts out more HP
> > and torque than competing motors from Ford.  Pushrods have
> > nothing to do with emissions, it is ignition and fuel
> > control more than anything, and combustion chamber design.
> > The new small blocks are as good as anything out there,
> > better than most.
> >
> > I am a basic fan of Ford, but there is NO, repeat, NO
> > arguing with the extreme success of the small block Chevy.
> > Ford had a similar motor, but they dumped it.  Now they are
> > really struggling with the more expensive to make and
> > maintain OHC motors.
> >
> > And yes, mods are plentiful, they work, and are cheap.  That
> > , my friend is the outline and model for the most successful
> > motor of all time, including today.  I am willing to bet the
> > small block is around longer than the OHC Ford motor.
> >
> > Don Mallinson
> >
> > sho2go wrote:
> >
> > > ----- Original Message -----
> > > From: "Donald Mallinson" <dmall@mwonline.net>
> > > To: <shotimes-admin@autox.team.net>
> > > Cc: <shotimes@autox.team.net>
> > > Sent: Saturday, November 02, 2002 8:00 AM
> > > Subject: Re: [Shotimes] (OT) Marauder
> > >
> > >
> > >
> > >>I agree with much of what you say, but you imply that the
> > >>Impala from the mid 90's was not successful.  Nothing could
> > >>be farther from the truth.  That car sold above sticker for
> > >>its entire run, and was only killed when GM needed the plant
> > >>to build more prolific and profitable trucks/suv's.
> > >>
> > >>
> > > Well, I was looking at production nos. awhile ago, and they were low.
> So
> > > what you are saying is that GM kept production low?  That would
explain
> low
> > > sales and remaining residual demand.  Of course the mods will be
> plentiful
> > > for that engine, but its old tech, high emissions design dooms it.
> > > Mike
> > > ______
> > _______________________________________________
> > Shotimes mailing list
> > Shotimes@autox.team.net
> > http://www.team.net/mailman/listinfo/shotimes
> _______________________________________________
> Shotimes mailing list
> Shotimes@autox.team.net
> http://www.team.net/mailman/listinfo/shotimes