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EarlyBay Forums
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: 603473" data-attributes="member: 23592"><p>Even with the dial indicator, there is a point where the piston is dweling for a bit while on TDC, so the tip i gave will give you an exact TDC point, whereas with the dial the measurement can be off by +-1 deg.</p><p></p><p>On the shims questions; after all the exercise swoping barrels and pistons, if you still find the difference, try the straight edge this time on top of barrels n.3 and 4 while rested on the case. Try to determine if the problem is with the case or the rod/crank. If you find the two barrels have a straight edge, or same height, i would just rework the n.4 chamber to match the compression of the other 3 if you want to get it perfect. </p><p>Now if the problem is the height of the cylinder, only solution will be to turn it down as there are no 0.15mm shims available.</p><p>Having 0.1:1 higher compression in one cylinder would not be a big deal in a stock engine, so you can leave it as is as well.</p><p>Abel</p></blockquote><p></p>
[QUOTE="atafonso, post: 603473, member: 23592"] Even with the dial indicator, there is a point where the piston is dweling for a bit while on TDC, so the tip i gave will give you an exact TDC point, whereas with the dial the measurement can be off by +-1 deg. On the shims questions; after all the exercise swoping barrels and pistons, if you still find the difference, try the straight edge this time on top of barrels n.3 and 4 while rested on the case. Try to determine if the problem is with the case or the rod/crank. If you find the two barrels have a straight edge, or same height, i would just rework the n.4 chamber to match the compression of the other 3 if you want to get it perfect. Now if the problem is the height of the cylinder, only solution will be to turn it down as there are no 0.15mm shims available. Having 0.1:1 higher compression in one cylinder would not be a big deal in a stock engine, so you can leave it as is as well. Abel [/QUOTE]
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Technical
Deck Height - One Cylinder is different, is this okay? Plus 7.3 compression ratio?
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