PTS Flowbench Forum

I'm sure if someone gets thier "panties in a wad" they will let me know . . . think "flow balls" we all know how that one turned out

Rick, I'm still unable to access lecture 8.

Have 1-7 and 9, now, but don't have lecture 8(Parts Integration for Power)

That one is not on "pumpgastech".com.

Once we get the horsepower we need then we need to get it to the ground. Here is a great book by Dave Morgan who I think is Darin Morgan's father. Someone correct me if I am wrong on that. Great book though on chassis. I highly recommend it.

John

http://racingsecrets.com/speedtalk_head_porting.shtml

Customer Comments:
"Being a Cylinder Head Porter, I especially enjoyed the interviews with Darin Morgan, Joe Mondello, Jim McFarland and Harold Bettes. I wear headphones while porting heads, and enjoy listening!"
Larry Meaux - Meaux Racing Heads http://www.maxracesoftware.com
Abbeville, LA

hdwgfx wrote:http://racingsecrets.com/speedtalk_head_porting.shtml

Customer Comments:
"Being a Cylinder Head Porter, I especially enjoyed the interviews with Darin Morgan, Joe Mondello, Jim McFarland and Harold Bettes. I wear headphones while porting heads, and enjoy listening!"
Larry Meaux - Meaux Racing Heads http://www.maxracesoftware.com
Abbeville, LA

Worth every penny!

Yup,

Have the series in the CD player in the truck i get my daily dose to and from work.

FYI just received this from speedtalk.com ???
---------------------------------------------------
New Book:
The Horsepower Chain - Racing engines explained through hardcore math.
http://horsepowerchain.com
--------------------------------------------


Included Equations

Engine design equations
Recommended intake lobe centerline (InLobeCL)
Best Exhaust duration (ExCamDur)
Best Lobe separation (LSA)
Recommended intake valve lift (InVL)
Intake valve diameter (InVD)
Total intake tract volume (InVol)
Total intake tract length (InTL)
Intake suction wave (InTL.1)
Intake closing wave (InTL.2)
Max intake cross-sectional area (MaxInArea)
Min intake cross-sectional area (MinInCSA)
Recommended intake plenum volume (PlnVol)
Recommended exhaust flow (ExCFM)
Recommended exhaust valve diameter (ExVD)
Max exhaust valve lift (ExVL)
Min exhaust cross-sectional area (MinExCSA)
Max exhaust cross-sectional area (MaxExArea)
Primary header tube diameter (ExTD)
Primary header tube length (ExTL)
Collector diameter (ExCD)
Engine performance equations
Shift RPM
Redline RPM
RPM @ Peak TQ
Gross Peak TQ
Net Peak TQ (Peak TQ)
RPM @ Peak HP
Gross Peak HP
Net Peak HP (Peak HP)
Other equations
Max piston speed
Equivalent piston speed
Normalized equivalent piston speed
Crank Pin speed
Mechanical efficiency
Pumping Losses
Friction Losses
Port velocity
Intake flow flux
Ideal intake flow flux
Intake flow coefficient
Exhaust flow flux
Theoretical HP per CFM for different fuel types
Critical effective compression ratio limit for each fuel type
Thermodynamic cycle efficiency
Compression Ratio Volume Factor
Effective compression ratio
Trapped cylinder pressure
Actual engine compression ratio (accounting for the IVC angle)
Piston Position
Intake Ramming VE%
Intake Ramming Function (this equation was “stumbled” upon)
Intake Pumping VE%
Throttle Body Pressure Loss
Throttle Body VE%
IR Throttle Body VE%
Power loss to curved runners
Plenum effect for different type manifolds
Intake manifold flow factor
Recommended bore to throat ratio
Potential power from multi valves
Loss of rpm range from too small a cam
Loss of torque from too small a cam
Loss of rpm range from too large a cam
Loss of torque from too large a cam
How VE% affects effective compression
Energy content per fuel type
Constants and Correction Factors
Camshafts constants (CamK)
Multi-valve constants
Conversion factor used in the calculation of horsepower
Conversion factor used in the calculation of RPM from piston speed
18 more...

Waiting on mail to deliver but that said here is a simple link hat may help some in the math department.

http://www.engr.colostate.edu/~allan/engines.html



Rick

David,
How is the reading going? Is the "Horsepower Chain" pretty good? It looks like is includes a lot of equations to use in the book.

Here is an interesting book I have had for a while. Just found it again as we sort through our stuff in hopes of selling our house.
"An Album of Fluid Motion" is a black and white picture album of different objects in flow. At the web site it includes a few of the pictures. I think it was worth the money.
http://www.amazon.com/Album-Fluid-Motio ... pg__header

John

Well,

I spent the $100 and I will tell you Save your money the book is a defacto companion manual for running and understanding Patrick’s software Engine Pro. Can you get some formulae out of the book? Sure but what I have found so far is that the equations used often have constants in them with no explanation of where they came from this makes me suspect.

I am dissecting the book by building a spreadsheet of the math formulas and trying to then correlate it to other formulas offered in other books such as Harold Bettes Engine Airflow and other engineering books I have.

My questions came when performing the Redline RPM for my combination and I get a number of 10200 RPM for a standard 80” big twin Harley. I am not saying I have not seen one spin 9000 but not with stock parts and where are all the constants in the formula coming from? That’s a big number to just pull out of the air.

Rick