AFR 325 flow sheets.... anyone ever flow these heads?
#111
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Since we took a turn towards tq bands, here's how it worked out.
Old engines
663 ft lbs @ 4600 peak
594 ft lbs @ 5800
New intake/ carb/ cam with highest hp and lowest tq.
658 ft lbs @ 4600
666 ft lbs @ 5100 peak
635 ft lbs @ 5800
Final combo as installed
662 ft lbs @ 4600
673 ft lbs @ 5300 peak
627 ft lbs @ 5800
So with making the types of changes available to Tim the torque peak moved up 700 rpm. Torque was down the entire range prior to 4600.
Edit- standby I transposed some numbers... All fixed
Old engines
663 ft lbs @ 4600 peak
594 ft lbs @ 5800
New intake/ carb/ cam with highest hp and lowest tq.
658 ft lbs @ 4600
666 ft lbs @ 5100 peak
635 ft lbs @ 5800
Final combo as installed
662 ft lbs @ 4600
673 ft lbs @ 5300 peak
627 ft lbs @ 5800
So with making the types of changes available to Tim the torque peak moved up 700 rpm. Torque was down the entire range prior to 4600.
Edit- standby I transposed some numbers... All fixed
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Straight bottoms and flat decks
Straight bottoms and flat decks
Last edited by bck; 01-08-2017 at 12:13 PM.
#112
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#113
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Since we took a turn towards tq bands, here's how it worked out.
Old engines
663 ft lbs @ 4600 peak
594 ft lbs @ 5800
New intake/ carb/ cam with highest hp and lowest tq.
658 ft lbs @ 4600
666 ft lbs @ 5100 peak
635 ft lbs @ 5800
Final combo as installed
662 ft lbs @ 4600
673 ft lbs @ 5300 peak
627 ft lbs @ 5800
So with making the types of changes available to Tim the torque peak moved up 700 rpm. Torque was down the entire range prior to 4600.
Edit- standby I transposed some numbers... All fixed
Old engines
663 ft lbs @ 4600 peak
594 ft lbs @ 5800
New intake/ carb/ cam with highest hp and lowest tq.
658 ft lbs @ 4600
666 ft lbs @ 5100 peak
635 ft lbs @ 5800
Final combo as installed
662 ft lbs @ 4600
673 ft lbs @ 5300 peak
627 ft lbs @ 5800
So with making the types of changes available to Tim the torque peak moved up 700 rpm. Torque was down the entire range prior to 4600.
Edit- standby I transposed some numbers... All fixed
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#115
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Couldn't agree more. Wasn't keeping this hull so I was not investing in new exhaust. We feel we left a lot on the table. But if that's what your running that's how you test.
#116
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Mine were dyno'd in full boat trim with the CMI sweepers, off the dyno straight into the boat......several dyno shops cant accommodate wet exhaust.
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#118
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Interesting to compare the powerbands. Our peak tq is the same rpm and the numbers are sort of close. You made noticeably more hp however 600 rpm higher.
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Straight bottoms and flat decks
Straight bottoms and flat decks
#119
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a CAM BETWEEN 248-256 DURATION NUMBERS... WILL MOVE both TQ AND hp UP... SAME AS MORE AIRFLOW IN GENERAL, EVEN IF i HAD SAME CAMS, HEADS FLOWING MORE AIR WILL STILL INCREASE POWER... TO A POINT..
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