PR3 pistons in a B18C GSR

[gazzar]

i have a B18C engine and i put a set of PR3 pistons with new ring pistons. the compression ratio was 210 psi. is that bad or good

 

[K2e2vin]

That's not how you measure compression ratio.

 

[gazzar]

so how do u measure it then

 

[Slow&Delirious]

volume at TDC vs Volume at BDC
Cyl Volume + Deck Clearance Volume + Head Gasket + Combustion Chamber Volume
Divided By
Deck Clearance + Head Gasket + Combustion Chamber Volume

 

[Slow&Delirious]

OR

Bore x Bore x Stroke x .7854 = Cylinder Volume = V1
Bore x Bore x Deck Clearance x .7854 =Clearance Volume = V2
Bore x Bore x Head Gasket Thickness x .7854 = Gasket Volume = V3
Combustion Chamber CC's x .061 = Combustion Chamber CI = V4

V1 + V2 + V3 + V4
---------------------
V2 + V3 + V4


But 210 psi sounds like a good reading for a honda engine, mine is like 140 psi and it runs allight

 

[caboose]

shouldn't that equation include piston dome/dish

 

[Briansol]

dome/dish is part of combustion chamber cc's

 

[caboose]

From Calculating Engine Compression - Formulas, Tech - Circle Track

The calculation for determiningcompression ratio works out likethis:

CR=(D + PV + DC + G + CC) / (PV + DC + G + CC)

CR = Compression Ratio

D = Displacement

PV = Piston Volume

DC = Deck Clearance Volume

G = Gasket Volume

CC = Combustion Chamber Volume

 

[Fernpatch]

Assuming your engine is otherwise stock your C/R should be about 11.3:1. 210 psi on a compression test is fairly decent. have you checked all 4 cylinders to see how close they are?

 

[crxpower24]

wait wat so wats the normal compresion for b18c

 

[LifeSucks88]

wait wat so wats the normal compresion for b18c

Go here > Honda Compression Ratio Calculator