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Compression Test

1792 Views 2 Replies 3 Participants Last post by  TataBobu
Hi All,

I am not sure if this should be in forced induction or here, since there is more alpha motor owners here i thought i would try here. Mods feel free to move it as you see fit.

Anyhow, i was wondering if anyone with a decompressed/low compression alpha motor (DOHC specifically) has ever done a compression test on their motor?

Fearing the worst i done one on my motor on the weekend and came up with the following figures: 175, 185, 185, 185psi. According to the webtech a stock motor should be around the 200 - 220psi mark with less than 14psi difference between cylinders. I am happy that my cylinders are within the 14psi tolerance, but i was wondering if the lower values are due to the lower compression (as i suspect).
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I think your right but someone can verify this im sure. I havent done a compression test since I swapped blocks and have lowered the compression. Good question :smoking:
You guess right, those low values are due to the decompressed engine.
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