 Soot stains on the backside of the inlet valve? |
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| falcor75 |
 Jan 7 2018, 05:59 AM
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Senior Member  Group: Members Posts: 1,579 Joined: 22-November 12 From: Sweden Member No.: 15,176 Region Association: Scandinavia 
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 Doing the winter valve adjustment after around 2000 miles on a fresh my freshly built motor i noticed these dark stains on the backside of the #3 inlet valve. The inlet valves of cyl 1 and 2 have similar stains but cylinder 4 valve is clean. What could cause this? and why would it be different between the cylinders? |
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| Mike Bellis |
Jan 7 2018, 04:55 PM
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None 
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Cam/valve overlap.
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| bretth |
Jan 7 2018, 05:47 PM
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#3
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Senior Member Group: Members Posts: 899 Joined: 23-June 15 From: Central TX Member No.: 18,882 Region Association: Southwest Region |
Maybe just some cooked oil residue?
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