| Compression Ratio measurements - Click HERE for Original Thread |
| Erfinder |
I was wondering if you could measure the compression ratio by using a compression gauge.
I was thinking if you take the reading, add 14.7psi (std pressure) and then divide that total by 14.7
For example if your compression tester read 120psi.... that would mean that the cylinder pressure is 120psi over atmospheric pressure (14.7psi)
(120psi + 14.7 ) / 14.7 = 9.16
So this would be a 9.16:1 compression ratio.
What do you guys think???
I've never really come accross a method to measure compression ratio so if you guys know of another way I'd like to hear it.
The reason I wanted to know is for adding head gaskets to reduce compression ratio for turboing a NA engine. |
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| Talonts96 |
| I don't think your formula is right considering that for a 2G DSM with 8.5 to 1 compression, the compression test readings should be close to 175 PSI. The service limit is 140 PSI which is still 20 PSI higher than your 120 PSI example where you got over 9:1 comperssion. Therefore, your formula doesn't seem to work. |
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| Erfinder |
Thanks for the link, it will help with some calculations.
I still wonder about the validity of using compression pressure to calculate the compression ratio since they should be directly proportional to each other. |
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