So i'm building a 350 for my 1980 Malibu and at this point my Static Compression ratio looks like its going to be 11.98:1 but my dynamic compression ratio is 9.77:1......you guys think i'll still be safe on pump gas?
static vs dynamic compression ratio and Octane
- Thread starter Vaughn3031
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There does not appear to be an exact consensuses on the ideal DCR you can run for pump gas but generally it seems to be between 8:1 to 8.5:1. Aluminum and Hemi heads let you get away with a bit more and also the available fuel (which can range from 91 to 93 octane depending on where you are at). Ambient air temperature also makes a difference.
When figuring DCR you also will want to realistically look at there you will likely drive the car. If you are in a situation like me, it can make a big difference. I live at 4500 ft, but often travel to cities that are at 2300 and 1100 ft. Then I usually make an annual trip to see family who live at 200 ft. My high compression car that has to have 91 Octane at 4500 ft is not at all happy at 200 ft.
X2
There does not appear to be an exact consensuses on the ideal DCR you can run for pump gas but generally it seems to be between 8:1 to 8.5:1. Aluminum and Hemi heads let you get away with a bit more and also the available fuel (which can range from 91 to 93 octane depending on where you are at). Ambient air temperature also makes a difference.
When figuring DCR you also will want to realistically look at there you will likely drive the car. If you are in a situation like me, it can make a big difference. I live at 4500 ft, but often travel to cities that are at 2300 and 1100 ft. Then I usually make an annual trip to see family who live at 200 ft. My high compression car that has to have 91 Octane at 4500 ft is not at all happy at 200 ft.
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