| rustedorrotting | -- 01-28-2020 @ 7:43 AM |
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i bought a pig in a poke engine off from a test stand years ago. when i recently started it and it was running badly i took a compression reading. I expected something around 80 to 100 pounds, instead i got 170 pounds on all 8 cyl's. i believe i have identified it as a 41 flat head ford. what could they have done to raise the compression that hi?
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| carcrazy | -- 01-28-2020 @ 10:19 AM |
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The combustion chambers and piston tops may be full of carbon deposits.
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| supereal | -- 01-28-2020 @ 11:25 AM |
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Pull the heads and see whether the block and heads were mismatched. Pistons in '41 were domed and were used '32 through'42. The common ways to increase compression are milling the heads, and/or increasing the stroke. When you have the heads off, turn one of the pistons to top dead center and see if the top ring is exposed If your compression gauge is operating correctly, the cause should be easy to see.
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| rustedorrotting | -- 01-28-2020 @ 12:22 PM |
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i have had both heads off, the pistons came to the top of the bore but no rings were exposed. it has Offy aluminum heads. engine is out and i am going to replace rods and mains
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| rustedorrotting | -- 01-28-2020 @ 12:24 PM |
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everything is clean, engine is basically unused.
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