Port timing calculators

All of the calculators are included on this page, the individual pages for cc, compression, oil etc have more detailed info on what to enter in to the caluculators.

All measurements in mm and cc

Exhaust Duration Calculator
Stroke:  mm
Conod Length:  mm
Piston Crown to Top of Barrel at TDC:  mm
Height over Port, Top of port to top of barrel:  mm
 
Exhause Duration (degrees):
Auto Fill Other Fields
Once you have filled in your Stroke, rod length and Crown to top of barrel above. Click Auto Fill Button.
Auto Fill
to clear the fields press Clear


Transfer Duration Calculator
Stroke:  mm
Conod Length:  mm
Piston Crown to Top of Barrel at TDC:  mm
Height over Port:, Top of port to top of barrel  mm
 
Transfer Duration (degrees):


Once you have calculated your exhaust and transfer timing click this to give;

Blowdown

 
Blowdown degrees:


Inlet Duration Calculator for piston port motors
Stroke:  mm
Conrod Length:  mm
Piston Crown to Top of Barrel at TDC:  mm
Piston height inlet side:  mm
Inlet Floor Depth, Top Barrel to Bottom Port:  mm
 
Inlet Duration (degrees):


Ignition Timing in mm Before TDC Calculator
Timing Degress A:
Conrod Length:  mm
Stroke:  mm
 
mm before TDC:  mm



CC Calculator
Bore:  mm
Stroke:  mm
 
CC =


Corrected and uncorrected compression ratios calculator
Bore:  mm
Stroke:  mm
Height over exhaust port, top of port to top of barrel  mm
head volume (head cc)  cc
 
uncorrected  :1
corrected  :1


Two stoke oil mix calculator for %
oil %, enter your chosen oil %:  %
litres of fuel:  Litres
 
ml of oil required  ml


Two stoke oil mix calculator for ratio
oil ratio , enter your chosen oil ratio (eg. for 25:1 enter 25):  :1
litres of fuel:  Litres
 
ml of oil required  ml


Calculate BMEP using Torque
Torque (lbs ft)
CC
 
BMEP

Calculate BMEP using BHP
HP
CC
RPM
 
BMEP

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