Running Riot

http://horsepowercalculators.net/the...al-engine-dyno

play with this. It kicks so much ***. There are a couple things I disagree with, like going from a 2.25" catback to a 1.875" will net me 2-7 more crank hp??? O_o

anyways I played around with it, I number checked since effing 8pm and finally at 230 am I was able to get appropriate numbers. (Said fuggit to my hw...I have no life....) anyway I was able to estimate that if I slapped a B16a head to a stock b18b bottem end with a 2 layer head gasket I can hit 183-190 crank hp (164 whp) which is pretty much accurate when compared to what people are getting with their ls/vtec builds. It gives you a virtual dynograph. Really cool ****.

As far as displacement and cam specs and all that bla bla bla you can get all that **** in reference sections around the internet. The numbers that you WILL need to calculate estimated hp are intake pipe diameter (2.5 for stock LS tube is what I used) stock LS intake tube length (36" I used roughly) and the fun ones, intake manifold volume length area etc.

Here we go:

Use david vizards formula (borrowed from DeLaney)
SQRT [ (target rpm for peak torque x Displacement x VE)/ 3330 ]
SQRT = square root
VE = Volumetric Efficiency in %
Displacement in Liters
eg.
So if we want peak torque at 5800 rpm at 95% VE in a teg, VE = 0.95
SQRT [ (5800x 1.8 L x 0.95)/3330]
= 1.73 in. or 43.8 mm (1,73 x 25.4 mm/in.) is the ideal runner diameter.

For plenum length
The general rule is that you should begin with a runner length of 17.8 cm for a 10,000 rpm peak torque location, from the intake opening to the plenum chamber. You add 4.3 cm to the runner length for every 1000 rpm that you want the peak torque to occur before the 10,000 rpm.
So, for instance, if peak torque should occur at 4,000 rpm the total runner length should be 17.8 cm + (6 x 4.3 cm) = 43.6 cm.

What I did was in the virtual dyno I said the plenums were round for ease of numbers. Volume is volume regardless if its a square or a circle. It was just easier to calculate the volume of a cylinder than that of an ellipse.

I got the runner length for a b18b 38.44cm and a diameter of 4.140cm. The volume of the runner is 1387.7cc.

Since I estimated the power of an LSVTEC with a B16 head and stock b16 manifold I got the runner length for a b16a 29.84cm and a plenum diameter of 4.597cm.

Didn't bother with a GSR. The ITR manifold is different from the b16 but the heads are the same.

Here are cam specs for you to play with

All specs supplied by Team-Integra.net

All of these specs are of the VTEC lobe only.
All duration specs are measured @1mm of lift for purposes of comparison between brands.

USDM GSR (B17a and B18C)
Intake lift 10.6mm, duration 230
Exhaust lift 9.4mm, duration 227

1997-1999 USDM ITR
Intake lift 11.5mm, duration 240
Exhaust lift 10.5mm, duration 235
CTR and 2000-2001 USDM ITR
Intake lift 11.5mm, duration 243
Exhaust lift 10.5mm, duration 235

Buddy Club
Spec 3
Intake lift 11.2mm, duration 250
Exhaust lift 11.5mm, duration 245
Spec 4
Intake lift 12.3mm, duration 269
Exhaust lift 11.8mm, duration 274

Crane
Stage 1
Intake lift 11.6mm, duration 243
Exhaust lift 10.8mm, duration 237

Crower
63402
Intake lift 11.83mm, duration 237
Exhaust lift 11.81mm, duration 228
63403
Intake lift 11.98mm, duration 246
Exhaust lift 11.83mm, duration 238

Jun
Type 1
Intake lift 10.9mm, duration 265
Exhaust lift 10mm, duration 268
Type 2
Intake lift 12mm, duration 267
Exhaust lift 10.9mm, duration 265
Type 3
Intake lift 12mm, duration 265
Exhaust lift 11.5mm, duration 265
Type 4
Intake lift 12.5mm, duration 265
Exhaust lift 12.5mm, duration 265

Piper
BP285
Intake lift 11.6mm, duration 256
Exhaust lift 11.2mm, duration 256

Rocket Motorsports
M22
Intake lift 12.1mm, duration 244
Exhaust lift 12.1mm, duration 244
M23
Intake lift 12.1mm, duration 252
Exhaust lift 12.1mm, duration 252
M24
Intake lift 12.1mm, duration 258
Exhaust lift 12.1mm, duration 258
M24E
Intake lift 12.7mm, duration 263
Exhaust lift 12.7mm, duration 263
M24X
Intake lift 12.7mm, duration 258
Exhaust lift 12.1mm, duration 265
M25
Intake lift 12.1mm, duration 270
Exhaust lift 12.1mm, duration 270
M25E
Intake lift 13.25mm, duration 276
Exhaust lift 13.25mm, duration 276

Skunk2
Stage 1
Intake lift 11.58mm, duration 252
Exhaust lift 10.8mm, duration 249
Stage 2
Intake lift 12.3mm, duration 266
Exhaust lift 11.8mm, duration 262
Stage 3
Intake lift 12.8mm, duration 270
Exhaust lift 11.8mm, duration 279
Pro Series
Stage 1
Intake lift 12.6mm, duration 264
Exhaust lift 11.9mm, duration 264
Stage 2
Intake lift 12.8mm, duration 270
Exhaust lift 12mm, duration 276

Spoon
Intake lift 11.53mm, duration 256
Exhaust lift 11.13mm, duration 245

Toda
Spec A
Intake lift 11.6mm, duration 250
Exhaust lift 11.2mm, duration 240
Spec B
Intake lift 12mm, duration 255
Exhaust lift 12mm, duration 245
Spec C
Intake lift 12.5mm, duration 255
Exhaust lift 12.5mm, duration 255

Increasing duration - Moves peak HP and peak TQ to a higher RPM. The actual value of both also increases.
Increasing lift - Increases HP and TQ, but does not move the point of peak HP and peak TQ up or down the RPM range.
Increasing overlap - Increases peak HP at the sacrifice of low end TQ. (This is where your cam gears come in, adjusting overlap.)

Camshaft terminology
Limit speed - Maximum speed at which a cam can spin.
Major Intensity - How fast the valves are accelerated open.
RPM bounce - The RPM at which the cam and valvespring can no longer control the valve.

stock valve dimensions
http://asian_e.tripod.com/Honda_Engine_Specs.htm

bore and stroke and ****
http://en.wikipedia.org/wiki/Honda_b_engine#B18B1

more valve size reference and useful ****
http://hybrid.honda-perf.org/tech/b20/b20tech.html

there you go. This should keep some of yall power addicts busy for a while.

ENJOY!

Running Riot

My first round

sdaidoji

iTrader: (1)

good god, RR...
ye sounds like me brotha... he do love this type of simulations. I myself prefer the stop-watch (butt-o-meter can be deceiving, actually - search for a older post on light vs heavy wheels)
cool toy, nonetheless .