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Still Doin Time
Join Date: Nov 2004
Location: Nokesville, Va.
Posts: 8,225
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Performance cam designs primarily optimize the bore / stroke/ connecting rod length of a given engine. The cylinder head / port size, configuration, length contributes to how well the cylinder is loaded ( volume). There is always some weak link or compromise in that HP/TQ chain.
My 96" drag iron Sportster. The stroke was increased a full 1" (4-13/16) retained the stock rod length as no one made a longer one at the time. It had a Red Shift 560 grind ( .560 lift at valve) over 300 degrees duration. I used the stock heads that were ported as no aftermarket was available. That cam was the largest you could install as the crank main roller bearing shell had to be fly cut so the lobe would swing past.
At 6000 RPM on paper, it required so much airflow the heads couldn't pass the volume so there was @9% loss in total output.
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'15 Dodge - 'Dango R/T Hauls groceries and Kinda Hauls *ss
'07 Jeep SRT-8 - Hauls groceries and Hauls *ss Sold
'85 Guards Red Targa - Almost finished after 17 years
'95 Road King w/117ci - No time to ride, see above
'77 Sportster Pro-Street Drag Bike w/93ci - Sold
Last edited by asphaltgambler; 12-20-2016 at 08:09 AM..
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