Compression test missing numbers?
#1
Compression test missing numbers?
TIA for any help, looking to buy a 2005 Shinka with 20k miles but asked for a compression test be done. The results came back as;
Rotor 1 compression : 91 PSI - 215 RPM
Rotor 2 compression : 100 PSI - 215 RPM
I called the shop, explained I was looking for 3 numbers and an RPM per rotor and they went on to try to explain why that's not possible, but I got lost along the way.
Rotor 1 compression : 91 PSI - 215 RPM
Rotor 2 compression : 100 PSI - 215 RPM
I called the shop, explained I was looking for 3 numbers and an RPM per rotor and they went on to try to explain why that's not possible, but I got lost along the way.
#3
Registered
TIA for any help, looking to buy a 2005 Shinka with 20k miles but asked for a compression test be done. The results came back as;
Rotor 1 compression : 91 PSI - 215 RPM
Rotor 2 compression : 100 PSI - 215 RPM
I called the shop, explained I was looking for 3 numbers and an RPM per rotor and they went on to try to explain why that's not possible, but I got lost along the way.
Rotor 1 compression : 91 PSI - 215 RPM
Rotor 2 compression : 100 PSI - 215 RPM
I called the shop, explained I was looking for 3 numbers and an RPM per rotor and they went on to try to explain why that's not possible, but I got lost along the way.
#8
Registered
Rotor 1 : 101.4, 98.5, 101.4
Rotor 2: 102.9, 110.5, 110.5
Mazda allows for a maximum of 20 PSI difference between rotor faces so you are well within spec. Compression in this car I would classify as above Mazda minimum spec. Engine still good so long as the test was performed on a hot engine. Also, this engine is in better shape than your first one.
Last edited by CaymanRotary; 05-13-2020 at 12:04 PM.
#9
Smoking turbo yay
You can plug in all the numbers at this site: http://foxed.ca/index.php?page=rotarycalc
#10
551 elevation. To use that calculator, do I have to first change the figures from kg/cm to psi? Then input those numbers into the calculator?
Last edited by Capt.Tightpants; 05-13-2020 at 01:41 PM.
#11
Smoking turbo yay
#12
Registered
551 feet wont really change the numbers that much. Still a decent engine just make sure those readings were taken while the engine was hot. Or, alternatively, if it was done by anyone worth their salt they would have provided a readout sheet.
#13
1st test – 607 altitude
Kpa
636 622 632 RPM 208
657 633 631 RPM 208
Kpa to psi
92.24 90.21 91.66
95.29 91.81 91.52
Normalized/converted kg/cm2
7.59 7.42 7.54
7.84 7.55 7.53
2nd test – 551 altitude
Kg/cm
7.3 7.1 7.3 RPM 281
7.5 8.0 8.0 RPM 283
Kg/cm to psi
103.83 100.99 103.83
111.51 113.79 113.79
Normalized/converted kg/cm2
7.16 6.96 7.16
7.65 7.81 7.81
I'm trying to compare the two and likely confused by all the different units used, but isn't the first one the better choice overall?
Kpa
636 622 632 RPM 208
657 633 631 RPM 208
Kpa to psi
92.24 90.21 91.66
95.29 91.81 91.52
Normalized/converted kg/cm2
7.59 7.42 7.54
7.84 7.55 7.53
2nd test – 551 altitude
Kg/cm
7.3 7.1 7.3 RPM 281
7.5 8.0 8.0 RPM 283
Kg/cm to psi
103.83 100.99 103.83
111.51 113.79 113.79
Normalized/converted kg/cm2
7.16 6.96 7.16
7.65 7.81 7.81
I'm trying to compare the two and likely confused by all the different units used, but isn't the first one the better choice overall?
#14
Registered
1st test – 607 altitude
Kpa
636 622 632 RPM 208
657 633 631 RPM 208
Kpa to psi
92.24 90.21 91.66
95.29 91.81 91.52
Normalized/converted kg/cm2
7.59 7.42 7.54
7.84 7.55 7.53
2nd test – 551 altitude
Kg/cm
7.3 7.1 7.3 RPM 281
7.5 8.0 8.0 RPM 283
Kg/cm to psi
103.83 100.99 103.83
111.51 113.79 113.79
Normalized/converted kg/cm2
7.16 6.96 7.16
7.65 7.81 7.81
I'm trying to compare the two and likely confused by all the different units used, but isn't the first one the better choice overall?
Kpa
636 622 632 RPM 208
657 633 631 RPM 208
Kpa to psi
92.24 90.21 91.66
95.29 91.81 91.52
Normalized/converted kg/cm2
7.59 7.42 7.54
7.84 7.55 7.53
2nd test – 551 altitude
Kg/cm
7.3 7.1 7.3 RPM 281
7.5 8.0 8.0 RPM 283
Kg/cm to psi
103.83 100.99 103.83
111.51 113.79 113.79
Normalized/converted kg/cm2
7.16 6.96 7.16
7.65 7.81 7.81
I'm trying to compare the two and likely confused by all the different units used, but isn't the first one the better choice overall?
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