Compression Test #'s
#1
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Compression Test #'s
Well, It's been almost six months since my miata has ran.. I just havent had time to mess with it lately. Anyways, I took the time today to get it running (320cc injectors on stock ECU, Idled pretty smooth)
I let it warm up and did a compression test to see if i might need to replace rings/rebuild the head before I boost it. I was consistant with the amount of oil i added to each cylinder, but im not sure if the amount i added was enough.
Anyways heres my numbers.
DRY / WET
190 195
173 180
178 181
210 220
It's odd that #4 cylinder is so much higher, thats how it was last time I tested it also.
I had oil on my plug threads when i pulled them, but then i noticed i had spilled oil all in the valley of the VC where the spark plug holes are, so maybe thats where it came from.
On another note, I think my igniter may be going bad or something, because when i started it for the first time, the dash took a few seconds to kick on. But the next time i started it, nothing, it was just dead.
I let it warm up and did a compression test to see if i might need to replace rings/rebuild the head before I boost it. I was consistant with the amount of oil i added to each cylinder, but im not sure if the amount i added was enough.
Anyways heres my numbers.
DRY / WET
190 195
173 180
178 181
210 220
It's odd that #4 cylinder is so much higher, thats how it was last time I tested it also.
I had oil on my plug threads when i pulled them, but then i noticed i had spilled oil all in the valley of the VC where the spark plug holes are, so maybe thats where it came from.
On another note, I think my igniter may be going bad or something, because when i started it for the first time, the dash took a few seconds to kick on. But the next time i started it, nothing, it was just dead.
#2
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they all increase fairly evenly with a little oil...if #4 was already soaking in some could be why it's higher, or the rings are letting some blow-by through. I wouldn't be too worried about them...
#4
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Now to pull the performance parts off the LT1 camaro so I can sell them and start buying stuff for the miata again.
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