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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Compression ratio
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<blockquote data-quote="davidd" data-source="post: 54450" data-attributes="member: 1177"><p>I would have thought with compression ratios that high the pinking noise would have told you something was wrong, but it is hard to argue with the math. Roy's is the quickest and cheapest solution. I would use an aluminum spacer. This can be sealed to the cases and I would think the O-ring would be happy with it. If you're worried use your favorite sealing compound without the O-ring. The compression plate will take some efficiency away from the squish band.</p><p></p><p>If you want to try and keep the squish band you could order a new set of pistons from Steve Hamel. You could specify them for the right compression and keep the squish. If you are certain about your methodology and conclusions, the first thing that you should do is disassemble and do the measurements accurately. This will allow you to decide what compression plate you need or what pistons you need.</p><p></p><p>I would think that you are correct about the difference in volume between the 500 and 600. I am not sure that they were the "wrong" heads, but they might have been the wrong pistons.</p><p></p><p>If I had a set of 600 heads I would swap you even!</p><p></p><p>Best of luck!</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 54450, member: 1177"] I would have thought with compression ratios that high the pinking noise would have told you something was wrong, but it is hard to argue with the math. Roy's is the quickest and cheapest solution. I would use an aluminum spacer. This can be sealed to the cases and I would think the O-ring would be happy with it. If you're worried use your favorite sealing compound without the O-ring. The compression plate will take some efficiency away from the squish band. If you want to try and keep the squish band you could order a new set of pistons from Steve Hamel. You could specify them for the right compression and keep the squish. If you are certain about your methodology and conclusions, the first thing that you should do is disassemble and do the measurements accurately. This will allow you to decide what compression plate you need or what pistons you need. I would think that you are correct about the difference in volume between the 500 and 600. I am not sure that they were the "wrong" heads, but they might have been the wrong pistons. If I had a set of 600 heads I would swap you even! Best of luck! David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Compression ratio
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