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DRR Pro |
If your BBC head flows 460 cfm will it need more fuel than a head that flows say 410 Thx in advance Brian Mollison 2013 American Dragster 2020 Sumerduck Dragway VA Top ET Champion 2017 Sumerduck Top ET & SSS Track Champion 2017 MAC Top ET Track Champion 2009 Sumerduck Dragway Va Top ET & IHRA SSS Track Champion 2008 IHRA Division 1 Top ET Bracket Final Runner-up 2007 Colonial Beach Dragway Top ET Track Champion | ||
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DRR Sportsman |
if you don't give it more fuel, it's going to be way lean. To the math we go!!!! 410 cfm x 2.2 = 902 hp 460 x 2.2 = 1012 hp 902 hp / .5 BSFC = 450 pph 1012hp / .5bsfc = 506PPH so roughly 12% more fuel Joe Without data, you’re just another guy with an opinion. | |||
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DRR Sportsman |
Pretty sure I’ve seen bsfc go down as the head gets better. How is that possible? I dunno, increased VE results in higher dynamic compression and therefore better thermal efficiency... who knows Now, if it’s mfi and you’re setting a baseline tune i sure wouldn’t bank on that. But I also wouldn’t be shocked if it makes more power on similar pfuel flow. | |||
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DRR S/Pro |
Is this a trick question!!!!!! As with most open ended questions like this the answer is it depends! But assuming you use the same combo, run it the port the heads and reinstall them,,, using a carb, no you don't, the carb will listen to the motor so the more air that flows through it, the more fuel it will send to the motor. This assumes that the rest of the combo can use/utilize the added airflow! If you had a MFI setup then you may need more fuel. | |||
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DRR S/Pro |
Not that simple. | |||
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