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2012-2013 Boss 302 Mustang
Out of the ashes, a Phoenix is born (Boss 302 teardown and rebuild)
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<blockquote data-quote="Tyler72" data-source="post: 14541384" data-attributes="member: 126103"><p>Man, it would have to be more rich than that to wash the cylinder walls. From the pics, they look decent. The other thing to remember is that the boss engines have forged pistons. The PTW clearance is a little on the loose side until everything warms up and the pistons expand. This is why cars with forged internals tend to use a slight amount of oil between changes. If he was only driving it on short trips, its plausible that the carbon buildup was caused by that. As far as the richer AFR, most "road race" tunes are a little on the rich side due to the extended times that the engine is under higher loads.</p><p></p><p>OP, was the .81 lambda at WOT? Engine fully warm?</p></blockquote><p></p>
[QUOTE="Tyler72, post: 14541384, member: 126103"] Man, it would have to be more rich than that to wash the cylinder walls. From the pics, they look decent. The other thing to remember is that the boss engines have forged pistons. The PTW clearance is a little on the loose side until everything warms up and the pistons expand. This is why cars with forged internals tend to use a slight amount of oil between changes. If he was only driving it on short trips, its plausible that the carbon buildup was caused by that. As far as the richer AFR, most "road race" tunes are a little on the rich side due to the extended times that the engine is under higher loads. OP, was the .81 lambda at WOT? Engine fully warm? [/QUOTE]
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2012-2013 Boss 302 Mustang
Out of the ashes, a Phoenix is born (Boss 302 teardown and rebuild)
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