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Cylinder Heads and Horsepower #550815 12/11/09 10:39 AM 12/11/09 10:39 AM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 OP master
S/ST 3040 OP master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	I'm aware of Super Flow's Peak CFM x .257 x Number of Cylinder Formula I'm not asking for formulas or theories. Basically, how much are you making and with how much flow. So give your typical head flow, what your car weighs and quarter mile trap speed. (I'll use Moroso's Power/Speed calculator) .100"_______65.1 .200"______129.6 .300"______187.4 .400"______234.5 .490"______254.1 Flow backs up over .490" 269� @ .050" .615" lift flat tappet cam. Race weight of 2830 lbs. and trap speed of 124.73 MPH 425 HP

Re: Cylinder Heads and Horsepower [Re: S/ST 3040] #550816 12/11/09 11:10 AM 12/11/09 11:10 AM
Joined: Oct 2005 Posts: 294 mi V vcummins enthusiast
vcummins enthusiast V Joined: Oct 2005 Posts: 294 mi	Quote: I'm aware of Super Flow's Peak CFM x .257 x Number of Cylinder Formula I'm not asking for formulas or theories. Basically, how much are you making and with how much flow. So give your typical head flow, what your car weighs and quarter mile trap speed. (I'll use Moroso's Power/Speed calculator) .100"_______65.1 .200"______129.6 .300"______187.4 .400"______234.5 .490"______254.1 Flow backs up over .490" 269� @ .050" .615" lift flat tappet cam. Race weight of 2830 lbs. and trap speed of 124.73 MPH 425 HP hear are some old #s from 2001 lift flow air speed in fps 100 68 90 200 144 176 300 205 248 400 249 294 500 285 320 600 291 330 700 295 335 small block 360 r/t head 3000 lbs 497.4 trq 583.9 hp 138 mph 600 lift 268 @ 50 105 ls If your # are backing up you will have to correct that Last edited by vcummins; 12/11/09 11:23 AM.

Re: Cylinder Heads and Horsepower [Re: vcummins] #550817 12/11/09 12:30 PM 12/11/09 12:30 PM
Joined: Mar 2007 Posts: 3,300 Northern Indiana Dunnuck Racing master
Dunnuck Racing master Joined: Mar 2007 Posts: 3,300 Northern Indiana	Vic, Feel free to post both of my combinations on here ,if you want to. You already have my flow sheets,and other information www.dunnuckracing.com

Re: Cylinder Heads and Horsepower [Re: vcummins] #550818 12/11/09 12:41 PM 12/11/09 12:41 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 OP master
S/ST 3040 OP master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Quote: If your # are backing up you will have to correct that I ported those back in 2003, before I figured out the valve job and port. I used them that way and was just giving my example....as unfavorable as it apears. They have been updated. .100"_______62.0 .200"______127.3 .300"______188.9 .400"______241.8 .500"______269.8 .550"______268.0 .600"______269.2 .650"______269.9 .700"______273.3 5661019-DSCN1744.JPG (177 downloads)

Re: Cylinder Heads and Horsepower [Re: S/ST 3040] #550819 12/11/09 01:37 PM 12/11/09 01:37 PM
Joined: Jan 2003 Posts: 5,486 SoCal Brian Hafliger master
Brian Hafliger master Joined: Jan 2003 Posts: 5,486 SoCal	I use pipemax alot to help with HP potential and have found that if I want to achieve my HP goal, I need to either get more flow than what Pipemax suggests (if it's a street deal) or I have to use a large or semi-large cam. What I mean is, if I have 250cfm at .500 lift and I cam it small but still have .600 lift I'll come just under my HP target. This is on street stuff...on 1/4 stuff I usually exceed pipemax by a small amount. Just the difference between Larry's bench/dyno and mine I would imagine. Brian Hafliger

Re: Cylinder Heads and Horsepower [Re: Dunnuck Racing] #550820 12/11/09 01:37 PM 12/11/09 01:37 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 OP master
S/ST 3040 OP master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Quote: Vic, Feel free to post both of my combinations on here ,if you want to. You already have my flow sheets,and other information OK but, I wasn't looking to answer my own questions. 451" 3150# 277� @ .050 .682" lift flat tappet 10.47 @ 127.4 MPH .100"_______72.5 .200"______151.6 .300"______222.9 .400"______262.9 .500"______286.8 .550"______293.4 .600"______297.9 .650"______298.4 .700"______304.2 500 HP 421" 3070# 274� @ .050" .629" flat tappet 10.20 @ 131.12 MPH .100"_______64.1 .200"______131.6 .300"______194.4 .400"______242.5 .500"______270.8 .550"______279.3 .600"______282.2 535 HP

Re: Cylinder Heads and Horsepower [Re: S/ST 3040] #550821 12/11/09 02:58 PM 12/11/09 02:58 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 OP master
S/ST 3040 OP master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Here's another one. (2009 EM 394") 394" 3018# 255� @ .050" .704" lift roller 9.81 @ 138 MPH .100"_______63.9 .200"______152.9 .300"______204.4 .400"______258.2 .500"______305.2 .550"______321.1 .600"______331.7 .650"______337.6 .700"______324.4 605 HP 5661292-DSCN2680.JPG (114 downloads) Last edited by S/ST 3040; 12/11/09 07:35 PM.

Re: Cylinder Heads and Horsepower [Re: S/ST 3040] #550822 12/11/09 03:45 PM 12/11/09 03:45 PM
Joined: Jan 2003 Posts: 16,123 Grand Haven, MI patrick I Live Here
patrick I Live Here Joined: Jan 2003 Posts: 16,123 Grand Haven, MI	one question, on using the speed calculator: I presume this is calculating/estimating RWHP? is the superflow formula estimating RWHP or crank HP? 1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod SOLD!* 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)

Re: Cylinder Heads and Horsepower [Re: S/ST 3040] #550823 12/11/09 03:50 PM 12/11/09 03:50 PM
Joined: Mar 2007 Posts: 3,300 Northern Indiana Dunnuck Racing master
Dunnuck Racing master Joined: Mar 2007 Posts: 3,300 Northern Indiana	Quote: OK but, I wasn't looking to answer my own questions. I have my reasons,..I will be getting ahold of you soon.Might have something for you to work on for me in the future. www.dunnuckracing.com

Re: Cylinder Heads and Horsepower [Re: S/ST 3040] #550824 12/11/09 03:53 PM 12/11/09 03:53 PM
Joined: Jan 2003 Posts: 6,266 Renton Washington T Triple Threat master
Triple Threat master T Joined: Jan 2003 Posts: 6,266 Renton Washington	Basic little 340 with OOTB eddies, I stole the numbers from Ryans site. Cam is 230/230 @.050 480/480. .100�----72.5/N/A .200�--131.1/107.0 .300�--182.9/151.8 .400�--216.6/181.2 .450�--227.7/182.9 .500�--235.9/185.6 .550�--238.7/185.6 12.29 @ 108 3550# FWIW on a Mustang chassis Dyno the car made 280tq @4800 and 280hp @5800 Last edited by Triple Threat; 12/11/09 03:55 PM. -Dustin 67 Dart, 9 second, 392" G3 Hemi 68 Barracuda 340 F/SA

Re: Cylinder Heads and Horsepower [Re: patrick] #550825 12/11/09 03:58 PM 12/11/09 03:58 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 OP master
S/ST 3040 OP master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Quote: one question, on using the speed calculator: I presume this is calculating/estimating RWHP? I'm not going to start that pissing match again. Quote: is the superflow formula estimating RWHP or crank HP? I'd say crankshaft HP.......that's why I asked for vehicle weights and trap speeds. That way, I can compare them to the same "yard stick".

Re: Cylinder Heads and Horsepower [Re: Triple Threat] #550826 12/11/09 04:04 PM 12/11/09 04:04 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 OP master
S/ST 3040 OP master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Quote: 12.29 @ 108 3550# FWIW on a Mustang chassis Dyno the car made 280tq @4800 and 280hp @5800 Moroso Power/Speed says 343 HP Maybe that will answer the crank/wheel HP question.

Re: Cylinder Heads and Horsepower [Re: S/ST 3040] #550827 12/11/09 04:34 PM 12/11/09 04:34 PM
Joined: Feb 2003 Posts: 10,234 Someplace you aren't S SomeCarGuy I Live Here
SomeCarGuy I Live Here S Joined: Feb 2003 Posts: 10,234 Someplace you aren't	That would be a 69 HP drop going through the driveline, right in line with the old rule of thumb of 20% loss Put you at 274, he saw 280 on the chassis dyno, good enough for margin of error all the way around. I want my fair share

Re: Cylinder Heads and Horsepower [Re: SomeCarGuy] #550828 12/11/09 05:01 PM 12/11/09 05:01 PM
Joined: Jan 2007 Posts: 3,695 nc E emarine01 master
emarine01 master E Joined: Jan 2007 Posts: 3,695 nc	Hummm Good post Vic But you can still beat me up on the chirp post before it get burried for good

Re: Cylinder Heads and Horsepower [Re: SomeCarGuy] #550829 12/11/09 05:01 PM 12/11/09 05:01 PM
Joined: Jan 2003 Posts: 9,893 Weddington, N.C. Streetwize master
Streetwize master Joined: Jan 2003 Posts: 9,893 Weddington, N.C.	I've always used .243 as the factor, or ~4.1cfm/hp/cyl....close to the .257 but a hair more conservative. What that is is POTENTIAL horsepower based on flow....all the stars (compression/cam/intake and exhaust system capacity) have to allign to get there. WIZE World's Quickest Diahatsu Rocky (??) 414" Stroker Small block Mopar Powered. 10.84 @ 123...and gettin' quicker! https://www.youtube.com/watch?v=-mWzLma3YGI In Car: https://www.youtube.com/watch?v=PjXcf95e6v0

Re: Cylinder Heads and Horsepower [Re: SomeCarGuy] #550830 12/11/09 05:01 PM 12/11/09 05:01 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 OP master
S/ST 3040 OP master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Quote: .....right in line with the old rule of thumb of 20% loss Not to further but, you can't really use a percentage. Otherwise an 800 HP engine would lose 160 HP through the same drivetrain.

Re: Cylinder Heads and Horsepower [Re: S/ST 3040] #550831 12/11/09 06:15 PM 12/11/09 06:15 PM
Joined: Jun 2009 Posts: 438 Great Lakes Region A abodiesonly1 mopar
abodiesonly1 mopar A Joined: Jun 2009 Posts: 438 Great Lakes Region	Good stuff Vic!

Re: Cylinder Heads and Horsepower [Re: S/ST 3040] #550832 12/11/09 06:16 PM 12/11/09 06:16 PM
Joined: Jan 2003 Posts: 16,123 Grand Haven, MI patrick I Live Here
patrick I Live Here Joined: Jan 2003 Posts: 16,123 Grand Haven, MI	Quote: Quote: 12.29 @ 108 3550# FWIW on a Mustang chassis Dyno the car made 280tq @4800 and 280hp @5800 Moroso Power/Speed says 343 HP Maybe that will answer the crank/wheel HP question. I think that does....the measured RWHP is ~82% of the calculated HP, which is in line with the ROT for average drivetrain loss.... 1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod SOLD!* 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)

Re: Cylinder Heads and Horsepower [Re: patrick] #550833 12/11/09 06:42 PM 12/11/09 06:42 PM
Joined: Aug 2003 Posts: 3,245 Between a rock & a hard place C cudadoug master
cudadoug master C Joined: Aug 2003 Posts: 3,245 Between a rock & a hard place	Here's one from my past - 263 peak flow at .600 3230 race weight 128.80 best trap speed.

Re: Cylinder Heads and Horsepower [Re: S/ST 3040] #550834 12/11/09 07:06 PM 12/11/09 07:06 PM
Joined: Feb 2004 Posts: 6,257 acworth / N. georgia - south e... cheapstreetdustr master
cheapstreetdustr master Joined: Feb 2004 Posts: 6,257 acworth / N. georgia - south e...	Quote: Quote: If your # are backing up you will have to correct that I ported those back in 2003, before I figured out the valve job and port. I used them that way and was just giving my example....as unfavorable as it apears. They have been updated. .100"_______62.0 .200"______127.3 .300"______188.9 .400"______241.8 .500"______269.8 .550"______268.0 .600"______269.2 .650"______269.9 .700"______273.3 this is a 915 smallblock head? something ive noticed...is if you graph the flow on most all ported iron (factory) smallblock heads..the graph looks about the same... the numbers may be higher or lower...but the shape of the graph looks similar.. for instance..i have two heads that have a bump in rate of flow..at the .550" mark... most of these heads are done around the .580 mark. i think thats why a .590 cam on them kicks butt on soo many smallblocks..fwiw.. i have my pushrod pinch removed..it made better numbers below...500.. then before..but it needs bowl work and short turn work..(i ran out of time) the cam is .483 lift 260@ 50..i think its at 108 i have too look.. it made..388rwhp..runs 7.48 on motor 1/8th 365" 3410lbs duster... and for what its worth ..this same motor made 311rwhp...with a different cam...(missed the target)..similar lift but much more duration for no2. i recall 300 duration.. cheapst. 365" Iron J heads,,3480lbs best 1.39 60ft on SS springs.10.54,124 mph ...6.67 1/8th et.average 60fts 1.46 w/ small cam &.063 no2 pill tagged & insured [image][/image]

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