B/D/F/H series compression calculator & how to figure out your compression using math

***StinkyTurbo*** · 08-21-2008, 08:42 PM

I was looking through the threads & saw a lot of “what’s my compression” threads on here so I decided to help a couple of you out. Here’s the formula to figuring out your compression ratio & finding out your displacement

The Calculation of an engine's compression ratio ( C.R. ) is based on the formula :
CR = (SV+CV)/CV

SV = Swept Volume for one cylinder in CC's = Bore x Bore x stroke x 12.9
CV = Clearance Volume for one cylinder in CC's = HV minus EDV plus DV plus GV
HV = Head Volume (measured in CC's) = Best if measured because head volume vaires
EDV = Effective Dome Volume (measured in CC's) = Dome volume minus valve relief and/or dish volume
DV = Deck Volume clearance (piston to deck) (measured in CC's) = Bore x Bore x Deck Height x 12.9
GV = Gasket Volume (measured in CC's) = Gasket Bore x Gasket Bore x Compression Thickness x (12.9 or enter known gasket volume)

Cubic Inch Displacement measurement
Bore x Bore x stroke x .7854 x 4(cylinders)

Here are the link to some compression calculators

D Series
Compression Calculator

B Series
Compression Calculator - Honda, Acura Tech Website, tutorials, tuning and HOW-TO's. Drag racing, street racing, road racing - C-speedracing.com

http://www.zealautowerks.com/

F/H Series
F/H Series Compression Ratio Calculator

USDM>JDM · 11-19-2008, 11:02 PM

11.9 cr with ctr pistons in a lsv sounds right?

Eman193 · 12-09-2008, 02:33 PM

12.8 comp. sounds fucking great!!!

DTR · 12-09-2008, 03:08 PM

10.6 in a h does that sound rite

08-21-2008, 08:42 PM	#1 (permalink)
*StinkyTurbo* PAY YOUR TAXES!!!! Join Date: Oct 2005 Location: Jersey City, Nj. Posts: 5,457 iTrader: (1)	B/D/F/H series compression calculator & how to figure out your compression using math I was looking through the threads & saw a lot of “what’s my compression” threads on here so I decided to help a couple of you out. Here’s the formula to figuring out your compression ratio & finding out your displacement The Calculation of an engine's compression ratio ( C.R. ) is based on the formula : CR = (SV+CV)/CV SV = Swept Volume for one cylinder in CC's = Bore x Bore x stroke x 12.9 CV = Clearance Volume for one cylinder in CC's = HV minus EDV plus DV plus GV HV = Head Volume (measured in CC's) = Best if measured because head volume vaires EDV = Effective Dome Volume (measured in CC's) = Dome volume minus valve relief and/or dish volume DV = Deck Volume clearance (piston to deck) (measured in CC's) = Bore x Bore x Deck Height x 12.9 GV = Gasket Volume (measured in CC's) = Gasket Bore x Gasket Bore x Compression Thickness x (12.9 or enter known gasket volume) Cubic Inch Displacement measurement Bore x Bore x stroke x .7854 x 4(cylinders) Here are the link to some compression calculators D Series Compression Calculator B Series Compression Calculator - Honda, Acura Tech Website, tutorials, tuning and HOW-TO's. Drag racing, street racing, road racing - C-speedracing.com http://www.zealautowerks.com/ F/H Series F/H Series Compression Ratio Calculator Last edited by StinkyTurbo; 12-02-2008 at 06:12 PM.

12-09-2008, 02:33 PM	#3 (permalink)
Eman193 Noob Join Date: Oct 2005 Posts: 333 iTrader: (0)	12.8 comp. sounds fucking great!!! __________________

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12-09-2008, 03:08 PM	#4 (permalink)
DTR Noob Join Date: Oct 2008 Posts: 303 iTrader: (0)	10.6 in a h does that sound rite