adirondac blue
TY 4 Stroke Junkie
WITH 10 TO 1 PISTONS AND ONE HEADGASKET , what will my compression ratio be with 5, 10, 15 ,20 lbs. Is there an equation for this and how will fuel octane be calculated . Just thinking about next year.
srx74
Extreme
TEST CHART
I DONT THINK THE COLUMNS WILL LINE UP BUT IF YOU START WITH 6.0:1 AT 2LBS = 6.8:1
AT 4LBS = 7.6:1
ETC...
SO 10.0:1 AT 8LBS = 15.4:1
AT 20LBS= 23.6:1
HOPE THIS HELPS
SRX74
TABLE 1: Effective Compression Ratio Chart
Static
Compression
Ratio Boost Pressure (psi)
2 4 6 8 10 12 14 16 18 20 22 24 26
6.0:1 6.8:1 7.6:1 8.4:1 9.3:1 10.1:1 10.9:1 11.7:1 12.5:1 13.3:1 14.2:1 15.0:1 15.8:1 16.6:1
6.5:1 7.4:1 8.3:1 9.2:1 10.0:1 10.9:1 11.8:1 12.7:1 13.6:1 14.5:1 15.3:1 16.2:1 17.1:1 18.0:1
7.0:1 8.0:1 8.9:1 9.9:1 10.8:1 11.8:1 12.7:1 13.7:1 14.6:1 15.6:1 16.5:1 17.5:1 18.4:1 19.4:1
7.5:1 8.5:1 9.5:1 10.6:1 11.6:1 12.8:1 13.6:1 14.6:1 15.7:1 16.7:1 17.7:1 18.7:1 19.7:1 20.8:1
8.0:1 9.1:1 10.2:1 11.3:1 12.4:1 13.4:1 14.5:1 15.6:1 16.7:1 17.8:1 18.9:1 20.0:1 21.1:1 22.1:1
8.5:1 9.7:1 10.8:1 12.0:1 13.1:1 14.3:1 15.4:1 16.6:1 17.8:1 18.9:1 20.1:1 21.2:1 22.4:1 23.5:1
9.0:1 10.2:1 11.4:1 12.7:1 13.9:1 15.1:1 16.3:1 17.6:1 18.8:1 20.0:1 21.2:1 22.5:1 23.7:1 24.9:1
9.5:1 10.8:1 12.1:1 13.4:1 14.7:1 16.0:1 17.31 18.5:1 19.8:1 21.1:1 22.4:1 23.7:1 25.0:1 26.3:1
10.0:1 11.4:1 12.7:1 14.1:1 15.4:1 16.8:1 18.2:1 19.5:1 20.9:1 22.21 23.6:1 25.0:1 26.3:1 27.7:1
10.5:1 11.9:1 13.4:1 14.8:1 16.2:1 17.6:1 19.1:1 20.5:1 21.9:1 23.41 24.8:1 26.21 27.6:1 29.1:1
11.0:1 12.5:1 14.0:1 15.5:1 17.0:1 18.5:1 20.0:1 21.5:1 23.0:1 24.51 26.0:1 27.51 29.0:1 30.5:1
I DONT THINK THE COLUMNS WILL LINE UP BUT IF YOU START WITH 6.0:1 AT 2LBS = 6.8:1
AT 4LBS = 7.6:1
ETC...
SO 10.0:1 AT 8LBS = 15.4:1
AT 20LBS= 23.6:1
HOPE THIS HELPS
SRX74
TABLE 1: Effective Compression Ratio Chart
Static
Compression
Ratio Boost Pressure (psi)
2 4 6 8 10 12 14 16 18 20 22 24 26
6.0:1 6.8:1 7.6:1 8.4:1 9.3:1 10.1:1 10.9:1 11.7:1 12.5:1 13.3:1 14.2:1 15.0:1 15.8:1 16.6:1
6.5:1 7.4:1 8.3:1 9.2:1 10.0:1 10.9:1 11.8:1 12.7:1 13.6:1 14.5:1 15.3:1 16.2:1 17.1:1 18.0:1
7.0:1 8.0:1 8.9:1 9.9:1 10.8:1 11.8:1 12.7:1 13.7:1 14.6:1 15.6:1 16.5:1 17.5:1 18.4:1 19.4:1
7.5:1 8.5:1 9.5:1 10.6:1 11.6:1 12.8:1 13.6:1 14.6:1 15.7:1 16.7:1 17.7:1 18.7:1 19.7:1 20.8:1
8.0:1 9.1:1 10.2:1 11.3:1 12.4:1 13.4:1 14.5:1 15.6:1 16.7:1 17.8:1 18.9:1 20.0:1 21.1:1 22.1:1
8.5:1 9.7:1 10.8:1 12.0:1 13.1:1 14.3:1 15.4:1 16.6:1 17.8:1 18.9:1 20.1:1 21.2:1 22.4:1 23.5:1
9.0:1 10.2:1 11.4:1 12.7:1 13.9:1 15.1:1 16.3:1 17.6:1 18.8:1 20.0:1 21.2:1 22.5:1 23.7:1 24.9:1
9.5:1 10.8:1 12.1:1 13.4:1 14.7:1 16.0:1 17.31 18.5:1 19.8:1 21.1:1 22.4:1 23.7:1 25.0:1 26.3:1
10.0:1 11.4:1 12.7:1 14.1:1 15.4:1 16.8:1 18.2:1 19.5:1 20.9:1 22.21 23.6:1 25.0:1 26.3:1 27.7:1
10.5:1 11.9:1 13.4:1 14.8:1 16.2:1 17.6:1 19.1:1 20.5:1 21.9:1 23.41 24.8:1 26.21 27.6:1 29.1:1
11.0:1 12.5:1 14.0:1 15.5:1 17.0:1 18.5:1 20.0:1 21.5:1 23.0:1 24.51 26.0:1 27.51 29.0:1 30.5:1
FastAction
Expert
:? :? :? 
peteracing
Expert
Say whattt!?
Compression ratios stay the same no matter how much boost you add!!!
Compression ratios stay the same no matter how much boost you add!!!
adirondac blue
TY 4 Stroke Junkie
tHANX FOR THE INFO, NOW how does that relate to octane.
16 to 1 should run what octane? etc. etc.
16 to 1 should run what octane? etc. etc.
sledheadgeorge
TY 4 Stroke God
Turbo Tim
TY 4 Stroke Master
sledheadgeorge said:
Wow I think according to those charts me and many others should have blown up our engines a long time ago !................The charts don't take in to account how efficient these Rx1 engines are .
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