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Re: Cylinder Heads and Horsepower
[Re: S/ST 3040]
#550855
12/11/09 11:58 PM
12/11/09 11:58 PM
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Joined: May 2006
Posts: 740
WA
JD Dart
super stock
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super stock
Joined: May 2006
Posts: 740
WA
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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"
269º @ .050" .615" lift flat tappet cam.
Race weight of 2830 lbs. and trap speed of 124.73 MPH
425 HP
Here's mine
IN CFM ----------EX CFM
.600 372 ---------- 277
.650 385 ---------- 281
.700 401 ---------- 286
.750 408 ---------- 290
Weight 2850 trap 151.58
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Re: Cylinder Heads and Horsepower
[Re: JD Dart]
#550857
12/12/09 12:04 AM
12/12/09 12:04 AM
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Joined: Jul 2006
Posts: 4,595
On the south side of Nowhere
S/ST 3040
OP
master
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OP
master
Joined: Jul 2006
Posts: 4,595
On the south side of Nowhere
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Quote:
Here's mine
IN CFM ----------EX CFM
.600 372 ---------- 277
.650 385 ---------- 281
.700 401 ---------- 286
.750 408 ---------- 290
Weight 2850 trap 151.58
What is the engine?
765 HP
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Re: Cylinder Heads and Horsepower
[Re: S/ST 3040]
#550858
12/12/09 12:07 AM
12/12/09 12:07 AM
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Joined: May 2006
Posts: 740
WA
JD Dart
super stock
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super stock
Joined: May 2006
Posts: 740
WA
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Quote:
Quote:
Here's mine
IN CFM ----------EX CFM
.600 372 ---------- 277
.650 385 ---------- 281
.700 401 ---------- 286
.750 408 ---------- 290
Weight 2850 trap 151.58
What is the engine?
765 HP
Low deck 499 B1 motor. I thougt it had more hp than that 
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Re: Cylinder Heads and Horsepower
[Re: S/ST 3040]
#550862
12/12/09 08:50 AM
12/12/09 08:50 AM
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Joined: Jan 2003
Posts: 16,934
NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,934
NC
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Quote:
Does 705 HP sound about right?
I never dyno tested it, only track tested!
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Re: Cylinder Heads and Horsepower
[Re: S/ST 3040]
#550863
12/12/09 08:55 AM
12/12/09 08:55 AM
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Joined: Jan 2003
Posts: 16,934
NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,934
NC
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Quote:
I do see a trend here, concerning the air flow.
The BIG engines get more power out of the air
they have available.....typically.
Perhaps that is why they say, "There is no replacement for displacement"
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Re: Cylinder Heads and Horsepower
[Re: JD Dart]
#550864
12/12/09 08:59 AM
12/12/09 08:59 AM
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Joined: Jan 2003
Posts: 16,934
NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,934
NC
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Quote:
Weight 2850 trap 151.58
765 HP
Low deck 499 B1 motor. I thougt it had more hp than that
Don't worry, just show everyone the 8 second timeslip and shut them up! 
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Re: Cylinder Heads and Horsepower
[Re: jb15]
#550866
12/12/09 11:08 AM
12/12/09 11:08 AM
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Joined: Jul 2006
Posts: 4,595
On the south side of Nowhere
S/ST 3040
OP
master
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OP
master
Joined: Jul 2006
Posts: 4,595
On the south side of Nowhere
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Quote:
Car, 2,760lbs,9.14@145 mph,
int. exh.
68-100-54
140-200-106
200-300-149
252.5-400-189
291.6-500-206
305.6-550-213.15
318-600-218
325-650-225
325-700-228
-750-238
exh. flows 265 @ .750 with flow pipe
645 HP
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Re: Cylinder Heads and Horsepower
[Re: S/ST 3040]
#550867
12/12/09 11:41 AM
12/12/09 11:41 AM
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Joined: May 2004
Posts: 3,210
robin hood country
deaks
master
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master
Joined: May 2004
Posts: 3,210
robin hood country
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Here's my old missmatched pile of parts before it blew up. 3250# 11.09 121.31mph 440 rb R280 cam 11.1 comp tested@28in int exh exh(wtube) .500 306.5 217.7 239.8 .600 324.5 230.8 256.6 .700 328.5 238.8 268.4 Mick
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36
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Re: Cylinder Heads and Horsepower
[Re: deaks]
#550868
12/12/09 11:48 AM
12/12/09 11:48 AM
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Joined: Jul 2006
Posts: 4,595
On the south side of Nowhere
S/ST 3040
OP
master
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OP
master
Joined: Jul 2006
Posts: 4,595
On the south side of Nowhere
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Quote:
Here's my old missmatched pile of parts before it blew up.
3250# 11.09 121.31mph 440 rb R280 cam 11.1 comp
[Email]tested@28in[/Email]
int exh exh(wtube)
.500 306.5 217.7 239.8
.600 324.5 230.8 256.6
.700 328.5 238.8 268.4
Mick
447 HP
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Re: Cylinder Heads and Horsepower
[Re: G_bob]
#550871
12/12/09 12:38 PM
12/12/09 12:38 PM
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Joined: Jul 2006
Posts: 4,595
On the south side of Nowhere
S/ST 3040
OP
master
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OP
master
Joined: Jul 2006
Posts: 4,595
On the south side of Nowhere
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Quote:
.100"_______75
.200"______158
.300"______234
.400"______287
.500"______326
.550"______337
.600"______348
.650"______352
.700"______355
505", .700 lift 264/268 @ .050, 3550 lbs.
9.96 @ 135
670 HP
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Re: Cylinder Heads and Horsepower
[Re: 440Jim]
#550872
12/12/09 01:52 PM
12/12/09 01:52 PM
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Joined: Jan 2005
Posts: 12,424
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,424
Kalispell Mt.
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Mabey the big engines are makeing more power because they are seeing increased airspeed through the port and mabey that is a better thing than we thought  Also small block motors actually lose quite a bit of lift from the terible PR angles, I have ran cams with valve springs that mathmatically would not work but in reality work just fine. An example is my 360 in my cuda right now, it has a comp XE268 and GM V6 springs with the stock valve job and they weren't recessed so they should be in major coil bind based on IH and theortical valve lift but at max lift with a solid lifter I can still stick a .010 feeler gauge between every coil so I know my lift is not quite at the .512 is should be, mabey the other guys have not taken this into account and are not seeing the airflow they think they are. Another thing is the bigger the motor the more likely they are to use a newer head with a good chamber and ports with less dead areas... in a lot of instances the smaller motors are useing older open chamber heads... I am not ragging on any one but the more money you have to put in a motor the bigger it gets and the better parts it gets, but I will concur it is possible the bigger motors do just make more power from the same airflow but I just wanted to throw out some of my 
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Cylinder Heads and Horsepower
[Re: HotRodDave]
#550873
12/12/09 01:58 PM
12/12/09 01:58 PM
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Joined: Jan 2003
Posts: 9,894
Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,894
Weddington, N.C.
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A couple footnotes: 1. Head flow is really only valid if your induction system (carb and intake) exceed it in capacity....otherwise your HP /mph is limited by the "weakest link". eX: a lot of smallblocks running RPM's or AIR GAPs may ET better (due to more torque) but typically an M1/Victor or a ported strip dominator will make more (sometimes considerably more) peak HP at the flywheel, as always a lot depends on the gear ratios and weight which will work better overall. On the street I'd rather have the higher average torque even if the peak power suffer a tad but for my track cars I want every R of that peak power I can get, so I gear accordingly. 2. Chassis efficieny and converter slip accounts more to ET but naturally also impacts top end MPH. Shorthand for "Your results may vary"  The good side is with a speed/et calculator and your chassis is at least whatever its "average factor" is....you might be able to say you're making "AT LEAST" that much power.
Last edited by Streetwize; 12/12/09 02:07 PM.
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Re: Cylinder Heads and Horsepower
[Re: gregsdart]
#550874
12/12/09 02:04 PM
12/12/09 02:04 PM
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Joined: May 2006
Posts: 740
WA
JD Dart
super stock
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super stock
Joined: May 2006
Posts: 740
WA
|
Quote:
Quote:
Quote:
Quote:
Here's mine
IN CFM ----------EX CFM
.600 372 ---------- 277
.650 385 ---------- 281
.700 401 ---------- 286
.750 408 ---------- 290
Weight 2850 trap 151.58
What is the engine?
765 HP
Low deck 499 B1 motor. I thougt it had more hp than that
Don't forget to factor in weather and DA that day.
http://www.dragtimes.com/da-density-altitude-calculator.php
But this was a great day temp 59f DA 455 mine shaft air. Maybe this next season I can get more mph
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