Does anybody have the official figures for compression of the 3A90?
I do have the figures for the 3A92, but they do not apply.
Does anybody have the official figures for compression of the 3A90?
I do have the figures for the 3A92, but they do not apply.
Sadly, we have very little info on the 3A90... I do believe it runs higher compression ratio which would obviously effect your compression testing. Alas, I can't really give you anymore info than that.
Custom Mirage products: Cruise control kit, Glove box light, MAF sensor housing, Rear sway bar, Upper grill block
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View my fuel log 2015 Mirage DE 1.2 manual: 47.2 mpg (US) ... 20.1 km/L ... 5.0 L/100 km ... 56.7 mpg (Imp)
Compression ratio is 11.5/1 as stated here https://www.mitsubishi-motors.com/en...S_EnP_3A90.pdf
I seem to recall that there are regional variations on that engine so I would double check that.
Can't find the in-cylinder compression pressure anywhere. You might check the owner's manual, sometimes there is a specifications page.
You might email Mitsubishi?
11.5:1, as listed on this forum in about 7 different places.
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View my fuel log 2018 Mirage ES 1.2 manual: 43.5 mpg (US) ... 18.5 km/L ... 5.4 L/100 km ... 52.2 mpg (Imp)
Say it don't spray it
Is your topend all carboned up again?
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)
Top is perfectly clean inside, like brand new. Zero detectable oil consumption, but only 9bar compression (about 130psi).
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View my fuel log 2018 Mirage ES 1.2 manual: 43.5 mpg (US) ... 18.5 km/L ... 5.4 L/100 km ... 52.2 mpg (Imp)
If you are about 2500ft above sea level, around 155psi.
Etc.
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View my fuel log 2018 Mirage ES 1.2 manual: 43.5 mpg (US) ... 18.5 km/L ... 5.4 L/100 km ... 52.2 mpg (Imp)