10.5 Compression Ratio on 91 octane???
Thread Starter
Racer
Joined: May 2006
Posts: 254
Likes: 0
From: Bradford Ontario
10.5 Compression Ratio on 91 octane???
I'm going to be doing a h/c swap on my 99 vette. I'm replacing the stock heads with cnc ported LS6 heads, which should raise the compression ratio from 10-1 to 10.5-1. Now in Canada every gas station only carries 91, but only Sunoco carries 93. Can I still run 91 octane with 10.5, or do I need to start feeding it 93 octane? I ask my tuner and he doesn't recommend running 91 with 10.5 compression. But my car usually runs on Shell 91 octane.
Melting Slicks
Joined: Apr 2003
Posts: 2,150
Likes: 6
From: NS
I'm going to be doing a h/c swap on my 99 vette. I'm replacing the stock heads with cnc ported LS6 heads, which should raise the compression ratio from 10-1 to 10.5-1. Now in Canada every gas station only carries 91, but only Sunoco carries 93. Can I still run 91 octane with 10.5, or do I need to start feeding it 93 octane? I ask my tuner and he doesn't recommend running 91 with 10.5 compression. But my car usually runs on Shell 91 octane.
Team Owner
Joined: May 2003
Posts: 23,480
Likes: 9
From: East Meadow NY
St. Jude Donor '12
