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Engine Compression
Posted: Wed Jun 01, 2005 12:16 pm
by troyster
I have searched and there are few different figures that come up for the normal pressure when a compression test is done. They vary from 140 -170.
I am getting the donk's compression (1.3L 1990 Sierra) checked out on Friday and would like to know what is considered good and bad compression. Any advice would be appreciated.
Posted: Wed Jun 01, 2005 5:00 pm
by lay80n
From memory i think new it was 200psi, and acceptable was anything above 175psi with less than 10psi variance between cylinders. Will look in my FSM and edit this if im wrong
Layto....
Posted: Wed Jun 01, 2005 10:57 pm
by JrZook
Im pretty sure ur right ive seen the 199psi figure somewhere
psi
Posted: Thu Jun 02, 2005 12:33 am
by toysuzi
hey all
(kpa) kilopascals - to - (psi) pounds-force per square inch
1 kpa = 0.145 psi
100kpa == 14.5 psi
1100kpa = 145 psi
1175kpa = 170 psi
1200kpa = 174 psi
1300kpa = 189 psi
1400kpa = 203 psi
engine compression specs
note these spec,s are with efi fuse removed
as wet bore will affect readings
f10a
1175-1300kpa
with maximum variation or 100kpa
G13A
1100-1400 kpa
max-v 100kpa
G16B efi
1100-1400kpa (carby G16a 1200-1400kpa)
max-v 100kpa
jimny g13bb
1200-1400
max-v 100kpa
j20a
1100-1400
max-v 100kpa
and so on
cheers
daryl