whitehendrix
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posted October 15, 2009 06:08 PM
good formulas to know?
got any good ones to know?
i kinda was thinkin just out of curiosity maybe one to find FPM of a piston at X rpm and maybe other useful ones. i have a bunch for calculationg fuel and turbo stuff, i'll post up if it seems pertainent.
____________
Duct tape is the handyman's secret
weapon. The black is for formal
occasions. - ZRXDean
ill never own a busa unless
someone gives me one.... and then
ill sell it -KZScott
  
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Y2KZX12R
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posted October 15, 2009 06:39 PM
I'm spoiled now, I use software that calculates about 25 different aspects of an engine configuration all at once.
The individual formulas are out there thou.
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whitehendrix
Zone Head
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posted October 15, 2009 10:33 PM
gah! make me do it the hard way will ya!! lol
Jim, care to rup off a copy of that (probably $5000) software!? lol
piston speed=stroke x 2 x RPM / 12
any other good ones to know?
____________
Duct tape is the handyman's secret
weapon. The black is for formal
occasions. - ZRXDean
ill never own a busa unless
someone gives me one.... and then
ill sell it -KZScott
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whitehendrix
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posted October 15, 2009 11:55 PM
 Edited By: whitehendrix on 16 Oct 2009 07:56
ok.. well, here. lol
Piston speed = stroke x 2 x RPM / 12
Port velocity = (bore^2/port_dia^2)*mean_piston_speed
CFM = 3456 / (C.I.D x RPM [max]) **this formula assumes 100% VE**
CFM = ( cid X .5 X Ve X rpm ) / 1728 (use 1.0 for 2 stroke engines)
Cubic inches =Cubic Centimeters/16.387
Injector sizing (in cc's) = (HP x B.M.F.C)/ (# of injectors x .80 (duty cycle))
Flow rate(modified) = (sq.rt of new rail pressure/old rail pressure) x old flow rate
BSFC = lb/hr of fuel / BHP
Fuel requirement = Horsepower x BSFC
Lbs/hr = HP x .5
GPH = Lbs/hr / 6
Pressure = V^2 / 57,600 (bernoulli's principle. v=velocity)
for turbo
Pressure ratio =Pb+Pa/Pa (pa= atmospheric (14.7), pb= boost)
PR=(14.7 + psi ) / 14.7
CFM = [(DxCIDxMAX RPM)/1728]xVExDR
CFM = L x RPM x VE x PR / 5660
Boosted CFM = PR x CFM
Turbine trim = [ (inducer^2) / (exducer^2) ] x 100
what else can i get to add to the list?
____________
Duct tape is the handyman's secret
weapon. The black is for formal
occasions. - ZRXDean
ill never own a busa unless
someone gives me one.... and then
ill sell it -KZScott
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tcchin
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posted October 16, 2009 07:47 AM
2 chest + 1 head = very, very dead
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Shane661
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posted October 16, 2009 07:50 AM
Some nice web based calculators:
http://users.erols.com/srweiss/index.html
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shiphteey
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posted October 16, 2009 08:02 AM
Yo Hendrix, got another phone, don't have your number. Call me when you get a chance, got a super cheap damper for you!
A.
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Gemini Motorcycles
Topping out everything from Ninja 250s to nitrous ZX-14s.
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osti33
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posted October 16, 2009 10:11 AM
quote:
2 chest + 1 head = very, very dead
LOL! Yup. 
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NOX
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posted October 16, 2009 02:57 PM
quote:
2 chest + 1 head = very, very dead
I am former LEO, that is funny as all get out..........
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almost_les
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posted October 16, 2009 03:36 PM
y=
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whitehendrix
Zone Head
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Posts: 757
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posted October 16, 2009 06:22 PM
i can see how useful and helpful this thread has become.
____________
Duct tape is the handyman's secret
weapon. The black is for formal
occasions. - ZRXDean
ill never own a busa unless
someone gives me one.... and then
ill sell it -KZScott
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