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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Pazon Sure Fire
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<blockquote data-quote="davidd" data-source="post: 26242" data-attributes="member: 1177"><p>Dear Vince,</p><p></p><p>If you are searching for 55 hp you may be better off starting on a dyno. Careful preparation and tuning should get you there. If you fall short, I would not find the combustion chamber of a stock head to be the likely target. I suspect that Roy may have milled the "bathtub" out of the TP heads as that shape did not produce any top end, but only low down torque. I do not want to put words in Roy's mouth, but Carleton Palmer had his TP head flowed and the bathtub was removed and the "D" shaped exhuast port was removed. After the mods were done the HP was up by 5. Terry and I have spoken about modifying new heads, but they are designed for the street which is where the customers are and the process of modifying new production heads is quite expensive. Terry's heads are essetially big port heads, so there is plenty there to modify.</p><p></p><p>My general comment would be that the exhaust port is the culprit followed by the exhaust system. Because it is easier to alter the pipes, that is where I would start. </p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 26242, member: 1177"] Dear Vince, If you are searching for 55 hp you may be better off starting on a dyno. Careful preparation and tuning should get you there. If you fall short, I would not find the combustion chamber of a stock head to be the likely target. I suspect that Roy may have milled the "bathtub" out of the TP heads as that shape did not produce any top end, but only low down torque. I do not want to put words in Roy's mouth, but Carleton Palmer had his TP head flowed and the bathtub was removed and the "D" shaped exhuast port was removed. After the mods were done the HP was up by 5. Terry and I have spoken about modifying new heads, but they are designed for the street which is where the customers are and the process of modifying new production heads is quite expensive. Terry's heads are essetially big port heads, so there is plenty there to modify. My general comment would be that the exhaust port is the culprit followed by the exhaust system. Because it is easier to alter the pipes, that is where I would start. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Pazon Sure Fire
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