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Technical
Deck Height - One Cylinder is different, is this okay? Plus 7.3 compression ratio?
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<blockquote data-quote="atafonso" data-source="post: 603642" data-attributes="member: 23592"><p>The main thing you need to establish, is if the n3 and n4 barrels have the same height. Try the straight edge on top of them to measure. If they are equal, there will be no sealing problems on the head.</p><p>Making parts as equalized as possible makes an engine better in all aspects, that's what we do when blueprinting them. You could live with one cylinder 0.1 point less compression? Yes, but every little helps, the results are more power, fuel economy and specially longevity.</p><p>If the cylinders have the same height, i would adjust chamber of cyl 4 to make an equalized compression ratio. Do not go on the green painted side, but on the wall of the spark plug side. That way, the flame will be more centralized, opposite of reworking the green area making the flame having to travel further.</p><p></p><p>Abel</p><p></p><p>Ps: The recommendation i am giving is based on the circunstancies presented by the OP not willing to crack the case open. The real way to fix the problem is checking rod lenght/crank grinding issues and addressing it if the seating surface of the cylinders is found not to be the culprit.</p></blockquote><p></p>
[QUOTE="atafonso, post: 603642, member: 23592"] The main thing you need to establish, is if the n3 and n4 barrels have the same height. Try the straight edge on top of them to measure. If they are equal, there will be no sealing problems on the head. Making parts as equalized as possible makes an engine better in all aspects, that's what we do when blueprinting them. You could live with one cylinder 0.1 point less compression? Yes, but every little helps, the results are more power, fuel economy and specially longevity. If the cylinders have the same height, i would adjust chamber of cyl 4 to make an equalized compression ratio. Do not go on the green painted side, but on the wall of the spark plug side. That way, the flame will be more centralized, opposite of reworking the green area making the flame having to travel further. Abel Ps: The recommendation i am giving is based on the circunstancies presented by the OP not willing to crack the case open. The real way to fix the problem is checking rod lenght/crank grinding issues and addressing it if the seating surface of the cylinders is found not to be the culprit. [/QUOTE]
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Technical
Deck Height - One Cylinder is different, is this okay? Plus 7.3 compression ratio?
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