[Diy_efi] : tuned port manifolds

[goonie.gordon at talk21.com]

Hi=20Dave,
I=20don't=20seem=20to=20be=20able=20to=20access=20naca.larc.nasa.gov=20for=20some=20reason.=20=20Are=20there=20any=20papers=20that=20you=20posses=20that=20may=20be=20of=20interest=20to=20me=3F

Alan=20Gordon
International=20Metrology=20Systems

>=20Jesse=20Ruppel=20wrote:
>
>=20=20We=20used=20"Design=20of=20Machinery"=20by=20Robert=20L.=20Norton=20in=20the=20mechanisms=20class=20I
>=20just=20finished=20up=20taking.=20=20It=20has=20a=20quite=20complete=20chapter=20on=20cam=20design=20in
>=20general,=20and=20even=20though=20there=20is=20little=20said=20on=20implementation=20to=20engines,
>=20it=20is=20still=20required=20material=20to=20design=20a=20proper=20cam.=20=20For=20the=20class=20I=20wrote
>=20up=20a=20rather=20lengthy=20Matlab=20program=20that=20will=20let=20me=20design=20a=20cam=20to=20meet=20any
>=20position,=20velocity,=20acceleration,=20or=20jerk=20requirements.
>
>=20You=20need=20the=20standard=20reference:=20"Valvetrain=20Design"=20by=20Michael=20C.
>Turkish,=201946,=20printed=20by=20Eaton=20Corporation.=20=20There's=20also=20some=20useful
>stuff=20in=20the=20NACA=20papers,=20at=20naca.larc.nasa.gov.
>
>
>=20
>=20=20=20I'm=20trying=20to=20design=20a=20turbo=20header=20for=20my=20Supra=20right=20now=20too.=20=20I've=20been
>=20looking=20for=20an=20in-depth=20(grad=20or=20PhD=20level)=20text=20on=20exhaust=20manifold=20design
>=20and=20I=20haven't=20been=20able=20to=20come=20up=20with=20much.=20=20Right=20now=20I=20am=20working=20on
>=20modeling=20the=20flow=20through=20the=20header=20using=20the=20differential=20equations
>=20Heywood=20presents=20in=20"Internal=20Combustion=20Engine=20Fundamentals"=20but=20solving
>
>=20The=20key=20is=20to=20watch=20the=20cylinder=20pressure=20through=20the=20exhaust=20cycle.=20
>Most=20of=20the=20exhaust=20mass=20passes=20the=20exhaust=20valve=20before=20the=20valve=20is
>fully=20open,=20as=20choked=20or=20sonic=20flow.=20=20Depending=20on=20the=20engine=20geometry,
>the=20residual=20pressure=20may=20range=20from=20an=20average=20of=20100=20PSI=20to=20below
>atmospheric=20at=20times.=20=20You're=20not=20going=20to=20see=20below=20atmospheric=20unless
>the=20exhaust=20is=20unmuffled=20or=20has=20an=20enormous=20receiver=20volume.
>
>=20Since=20the=20majority=20of=20the=20gas=20flow=20past=20the=20valve=20is=20sonic,=20the=20'slug'
>can=20be=20treated=20as=20an=20incompressible=20fluid=20without=20throwing=20things=20off
>too=20badly.=20=20For=20a=20six=20cylinder=20there=20is=20no=20interference=20between
>cylinders=20as=20long=20as=20the=20cam=20timing=20is=20below=20240=20degrees,=20so=20it=20really
>doesn't=20matter=20what=20you=20do=20with=20the=20pipe=20diameters=20or=20lengths.
>
>=20You=20can=20get=20diverted=20into=20all=20sorts=20of=20acoustic=20resonance=20dead=20ends,
>but=20they're=20just=20mind=20candy.=20=20Resonance=20in=20the=20exhaust=20system=20reflects
>through=20the=20cylinder=20all=20the=20way=20through=20the=20intake=20tract=20to=20the=20air
>filter.=20=20Carburetors=20and=20some=20MAF=20EFI=20systems=20were=20very=20sensitive=20to
>this,=20but=20twiddling=20with=20the=20exhaust=20geometry=20was=20just=20playing=20with
>secondary=20effects.=20=20As=20long=20as=20your=20fuel=20metering=20system=20isn't=20bothered
>by=20exhaust=20resonance=20during=20overlap,=20and=20there's=20no=20interference=20between
>cylinders=20on=20the=20exhaust=20strokes,=20and=20back=20pressure=20isn't=20too=20high=20(less
>than,=20say,=2010=20PSI=20at=20WOT),=20you=20don't=20have=20to=20worry=20much=20about=20the
>header.
>
>=20You=20will,=20again,=20find=20considerable=20information=20of=20this=20type=20among=20the
>NACA=20papers,=20which=20have=20been=20scanned=20and=20are=20kept=20on=20the=20Web=20by=20the=20US
>government.
>These=20are=20all=20primary=20research=20documents,=20written=20by=20people=20paid=20to=20do
>hands-on=20test-to-destruction,=20not=20tertiary=20or=20quaternary=20summations=20like
>Heywood.
>
>--=20
>=3D=3DNEW:=20ronin at aristotle.net=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>I've=20got=20a=20secret=20/=20I've=20been=20hiding=20/=20under=20my=20skin=20/=20|=20Who=20are=20you=3F
>my=20heart=20is=20human=20/=20my=20blood=20is=20boiling=20/=20my=20brain=20IBM=20|=20=20=20who,=20who=3F
>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=20<a=20Target=3D'_new'=20Href=3D'http://talk21.btopenworld.com/redirect.html=3Fhttp://angelfire.com/ar/dw42/index.htm'>http://angelfire.com/ar/dw42/index.htm</a>
>
>_______________________________________________
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