Pecks or marks on top of piston
Moderators: jsmcortina, muythaibxr
Pecks or marks on top of piston
Pic taken using a boroscope. It's the top of a piston viewed through the spark plug hole. Motor is a 6 cylinder BMW. Any idea what the marks are?
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Matt Cramer
- Super MS/Extra'er
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Re: Pecks or marks on top of piston
Detonation?
Foreign object damage?
Foreign object damage?
Matt Cramer -1966 Dodge Dart slant six running on MS3X
Re: Pecks or marks on top of piston
What did the spark plug look like?
Linfert Performance/321 Motorsports
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SCCA 2019 SM National Champion Crew Chief
SCCA 2023 FP National Champion Tuner/electrical engineer
100s of MS systems built installed and tuned
Support the developers!
Re: Pecks or marks on top of piston
Spark plug is black with a touch of tan on the insulator.
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elutionsdesign
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Re: Pecks or marks on top of piston
What symptoms are you seeing that prompted the inspection?
Graduate of EFI University.
I build, repair, install and tune Megasquirt systems in North Dakota and beyond!
I build, repair, install and tune Megasquirt systems in North Dakota and beyond!