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Scavenge pattern discussion

mweba

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Efficient clean charge and burn is the goal. Lets see some patterns and and suggestions.

Have last years build off saw down for the first time (350). I have uniform wash on the intake side and the chamber looks good with the exception of unburnt charge center intake side.

This is a 353 cylinder so the trans are flat as I could get....What would you guys try to get a more complete burn?


Untitled by mweba1, on Flickr
 

stihlbro

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359.





Just sharing a similar pic for discussion.
 

mweba

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Pattern looks uniform, Joey. Ports look close to stock and so does the wash. What oil are you using...or did that saw have 100's of hours on it?
 

stihlbro

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Ports untouched. Squish set. Small pop up. Lower transfer slightly matched. Oil was probably stihl orange bottle. Been a couple years back.
 

srcarr52

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Index you spark plug, you can see the ground electrode in you burn pattern. A little carbon spot under the spark plug is really unavoidable.
 

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