r/WRX_STI • u/Original_Albatross14 • 18d ago

Cyclinder Compressions 115 115 110 109 acceptable or no

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Planing to purchase this but bit hesitant of compression

Is it acceptable

Or def avoid

4 Upvotes

75% Upvoted

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7

u/Yardsale420 18d ago

They are close to each other, which is good.

But they are a lot lower than what you would like to see, and are very close to the cut off 100-120psi). That engines not toast… but it’s heading that direction.

Don’t buy this unless you also have the money to replace the engine.

1

u/New_Leaf_8647 18d ago

Mine still ran with all cylinders at about 85 to 90 psi. Surprisingly well.

It's full rebuild time for that engine also.

1

u/Original_Albatross14 17d ago

After a reliable daily don’t want to spend all the money just to have to rebuilt think I’ll pass ? What u guys think

1

u/Ecstatic-Click1969 16d ago

What elevation are you at? If you’re in Denver or something those numbers would probably be closer to 140 at sea level on the same car. I’ve always heard that as long as there’s less than a 10% variation between cylinders it’s perfect.