PicoScope 7 Automotive
Available for Windows, Mac, and Linux, the next evolution of our diagnostic scope software is now available.
I disagree. Compression pressure should be higher than compression ratio.Technician wrote:Hi Tronic,
The technical data I have advises a compression ratio of 18.3.1, this equates to approx 18 bar.
The compression ratio I thought was the minimum acceptable and not the maximum, so yes I agree it should or would be higher when tested dynamically, especially with a warm engine, but as a guide it should be reliable.volrem wrote:I disagree. Compression pressure should be higher than compression ratio.Technician wrote:Hi Tronic,
The technical data I have advises a compression ratio of 18.3.1, this equates to approx 18 bar.
It also depends of additional volume measuring tool has.
With WPS I usually measure measure 22-23 bar (18:1 engine) and with compensation it's 27-29 bar.
post64371.html#p64371
I just located a formula which includes specific heat ratio, therefore;Technician wrote:The compression ratio I thought was the minimum acceptable and not the maximum, so yes I agree it should or would be higher when tested dynamically, especially with a warm engine, but as a guide it should be reliable.volrem wrote:I disagree. Compression pressure should be higher than compression ratio.Technician wrote:Hi Tronic,
The technical data I have advises a compression ratio of 18.3.1, this equates to approx 18 bar.
It also depends of additional volume measuring tool has.
With WPS I usually measure measure 22-23 bar (18:1 engine) and with compensation it's 27-29 bar.
post64371.html#p64371
That looks like a formula from a wikipedia page "https://en.wikipedia.org/wiki/Compression_ratio" where the 10.3 is the compression ratio, so I think your specific formula should be (1 bar * (18.3^1.4)).I just located a formula which includes specific heat ratio, therefore;
pTDC = 1 bar x 10.3^1.4 = 26.2
Sorry typo error on my behalfThat looks like a formula from a wikipedia page "https://en.wikipedia.org/wiki/Compression_ratio" where the 10.3 is the compression ratio, so I think your specific formula should be (1 bar * (18.3^1.4)).I just located a formula which includes specific heat ratio, therefore;
pTDC = 1 bar x 10.3^1.4 = 26.2