Compression Test Result on a Cosworth
#1
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Thread Starter
Compression Test Result on a Cosworth
Hi can somebody let us know what kind of compression readings/results we should be getting from a 4x4 saph with around 106k (not too sure if its been rebuilt but know the top end has been done @90k)
On a dry test we got the following results:
Cyl 1: 160 psi
Cyl 2: 135-140 psi
Cyl 3: 140 psi
Cyl 4: 150-160 psi
On a wet test (dropping some oil into each bore/spark plug hole)
Cyl 1: 160 psi
Cyl 2: 145-150 psi
Cyl 3: 150 psi
Cyl 4: 160 psi
Car starts & drives fine no overheating, losing/mixing water etc...
The reason the test was done because it seems to give out blue'ish smoke now and then. When the spark plugs were removed for the test no. 4 plug was covered in Oil, is this normal?
Any input appreciated
On a dry test we got the following results:
Cyl 1: 160 psi
Cyl 2: 135-140 psi
Cyl 3: 140 psi
Cyl 4: 150-160 psi
On a wet test (dropping some oil into each bore/spark plug hole)
Cyl 1: 160 psi
Cyl 2: 145-150 psi
Cyl 3: 150 psi
Cyl 4: 160 psi
Car starts & drives fine no overheating, losing/mixing water etc...
The reason the test was done because it seems to give out blue'ish smoke now and then. When the spark plugs were removed for the test no. 4 plug was covered in Oil, is this normal?
Any input appreciated
#2
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Hi can somebody let us know what kind of compression readings/results we should be getting from a 4x4 saph with around 106k (not too sure if its been rebuilt but know the top end has been done @90k)
On a dry test we got the following results:
Cyl 1: 160 psi
Cyl 2: 135-140 psi
Cyl 3: 140 psi
Cyl 4: 150-160 psi
On a wet test (dropping some oil into each bore/spark plug hole)
Cyl 1: 160 psi
Cyl 2: 145-150 psi
Cyl 3: 150 psi
Cyl 4: 160 psi
Car starts & drives fine no overheating, losing/mixing water etc...
The reason the test was done because it seems to give out blue'ish smoke now and then. When the spark plugs were removed for the test no. 4 plug was covered in Oil, is this normal?
Any input appreciated
On a dry test we got the following results:
Cyl 1: 160 psi
Cyl 2: 135-140 psi
Cyl 3: 140 psi
Cyl 4: 150-160 psi
On a wet test (dropping some oil into each bore/spark plug hole)
Cyl 1: 160 psi
Cyl 2: 145-150 psi
Cyl 3: 150 psi
Cyl 4: 160 psi
Car starts & drives fine no overheating, losing/mixing water etc...
The reason the test was done because it seems to give out blue'ish smoke now and then. When the spark plugs were removed for the test no. 4 plug was covered in Oil, is this normal?
Any input appreciated
im not sure but you might have oil getting past the rings or it might be worn valve guides /stem rubbers
marco
#5
Too many posts.. I need a life!!
Thread Starter
Forgot to add its a Stage 3 and what do you mean by it'll die what will happen like will it just sieze up or something?
#7
*** Sierra RS Custard ***
iTrader: (3)
Dramatic failures almost never happen on an old YB if they are given regular oil changes and belt changes and pump changes etc, nothing that loose is EVER going to seize, lol
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#11
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if you knew my old saff you'd take that back
mine smoked as std spec ar 93k, at 100 it was stage 1, then 110k stage 3
348 and 14000miles later still goign strong, still smoking on hard throttle,
then i smashed it up
the engine is now going in a puma
but general you are right
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