STEALTHRAM dyno results and other info

grumpyvette · Oct 9, 2008

http://www.eecis.udel.edu/~davis/z28/wi ... bpage.html

http://www.eecis.udel.edu/~davis/z28/wi ... 21105.html

http://www.eecis.udel.edu/~davis/z28/wi ... mrinstall/

http://www.highperformancepontiac.com/t ... ck_engine/

http://www.eecis.udel.edu/~davis/z28/wi ... 10511.html

Stealth TPI Induction - L98 Stroker Installation - Super Chevy Magazine

This Chevrolet L98 TPI engine has its displacement stroked to 383 cubic inches and has stealth mods installed including a new cam and an extrude honed tuned port injection system to make 458 HP - Super Chevy Magazine

www.motortrend.com

stealthram base

porting the runners on a stealth ram is mandatory for maximizing flow rates, leaving the runner entrance like this creates a restriction and turbulence, and if your significantly increasing the air flow rates your obviously going to need a longer duration cam, better flowing cylinder heads a low restriction exhaust, efficient headers and larger injectors to supply more fuel, ETC.
porting helps flow significantly, but the walls should be smoothed and opened up carefully down 3" or more into the runner entrance and exits

rough and smooth are fairly relative terms, smooth in an intake runner generally refers,
too the mirror like surfaces that were almost thought too be mandatory in the 1950s-early 1960s
but you certainly can,t get a "smooth surface texture "
with anything in a flapper wheel of 80 grit or larger grit

http://www.thepolishingshop.co.uk/acatalog/Flap_Wheels_Long_Reach_.html

http://www.thepolishingshop.co.uk/acatalog/Flap-Wheel-10mm-x-10mm-x-3mm-Shank-Std.html

http://garage.grumpysperformance.com/index.php?threads/where-to-buy-abrasives.3422/#post-9070

http://garage.grumpysperformance.com/index.php?threads/porting-can-help.462/page-3#post-72525

http://garage.grumpysperformance.co...-by-step-guide-with-pictures.5378/#post-71848

Last edited: A moment ago

grumpyvette · Oct 22, 2013

Ive repeatedly had questions about how much the stock CHEVY TUNED PORT INJECTION INTAKE can be improved thru careful hand porting, while you obviously can increase flow rates your limited in the basic intake design and port cross sectional area.
a bit of research and math will tell you your basically beating a dead horse if your looking to make really impressive power levels, well over about 420hp, as the stock intakes DESIGNED for a 305 cubic inch displacement engine and peak torque will be in the 3500rpm-4000rpm range in most sbc engines due to the port cross sectional area, porting the base and intake runners may help, but its never going to allow the engine to breath efficiently much above 4200rpm if any of the stock or nearly stock components are used, that doesn,t mean the cars performance can,t be significantly improved from the stock 250 hp, but there are other options if your serious about making a good deal more power.
EXAMPLE
if you did a bit of math, a runner or port with a cross sectional area of about 1.7 square inches would effectively max flow at about 3430rpm on a 350 sbc
an additional square inch of cross sectional area , or about 2.7 sq inches would allow that same 350 displacement engine to spin up near 5445 rpm before the port became as restrictive to air flow, and your power curve is dependent on efficient air flow rates.
what this means is that careful selection of better cylinder heads and a different , matching aftermarket intake , along with the correct cam timing can significantly increase your engines potential far beyond what the stock TPI intake is capable of even extensively ported versions.

calculate horse power from intake port flow rates
http://www.wallaceracing.com/calcafhp.php

http://www.wallaceracing.com/calchpaf.php

http://www.wallaceracing.com/ca-calc.php

http://www.wallaceracing.com/max-rpm.php

http://www.wallaceracing.com/lpv.php

http://www.wallaceracing.com/chokepoint.php

http://www.wallaceracing.com/chokepoint-rpm.php

http://www.wallaceracing.com/area-under-curve.php

http://www.wallaceracing.com/piston-speed-velocity.php

http://www.wallaceracing.com/header_length.php

related info
http://garage.grumpysperformance.com/index.php?threads/ideal-tpi-build.12203/#post-59261

viewtopic.php?f=44&t=9565&p=35285&hilit=tuned+port+stealth+edelbrock#p35285

http://xtremecarzone.com.au/STORAGE/ART ... ptions.pdf

viewtopic.php?f=52&t=148&p=34936&hilit=calculate+port+stall#p34936

viewtopic.php?f=55&t=1509

viewtopic.php?f=55&t=823&p=1215&hilit=runner+area#p1215

viewtopic.php?f=44&t=9565&p=35285&hilit=tuned+port+cross+sectional+area#p35285

viewtopic.php?f=38&t=1099&p=2152&hilit=runner+area#p2152

viewtopic.php?f=52&t=8460&p=32923&hilit=porting+help#p32923

viewtopic.php?f=55&t=8485&p=29767&hilit=porting+help#p29767

viewtopic.php?f=55&t=1052&p=1974&hilit=runner+intake+edelbrock#p1974

viewtopic.php?f=55&t=431&p=530#p530

viewtopic.php?f=52&t=462&hilit=porting+help

http://www.airflowresearch.com/super-chevy-sep-2013-195cc-sbc.php

USE THE CALCULATORS
http://www.rbracing-rsr.com/runnertorquecalc.html
http://www.wallaceracing.com/chokepoint.php
http://www.wallaceracing.com/header_length.php

keep in mind that the port cross sectional area, cam lift and duration and exhaust scavenging, or exhaust back pressure in any engine is limiting air flow, so do the required math to find out at what point in the rpm band the intake design starts being restrictive.
a couple hours , spent reading threads and doing some research can make a huge difference in your engine build results
you might want to keep in mind the cylinder head flow rates ,and cam timing & lift, displacement and effective compression, exhaust scavenging are key to results
CROWER
http://www.crower.com/media/pdf/chevrolet.pdf

CRANE
http://www.cranecams.com/uploads/catalog/Crane Cams Master Catalog.pdf

ERSON
http://www.pbm-erson.com/UserFiles/Documents/Catalogs/2013 erson catalog.pdf

HOWARD
http://www.howardscams.com/howards2015.pdf

HERBERT
http://www.herbertcams.com/herbert-cams-cam-kits/

ENGLE
http://www.englecams.com/downloads/2010_engle_catalog.pdf

STEALTHRAM dyno results and other info

grumpyvette

Administrator

Stealth TPI Induction - L98 Stroker Installation - Super Chevy Magazine

grumpyvette

Administrator