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| Pontiac - Boost Turbo, supercharged, Nitrous, EFI & other Power Adders discussed here. |
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#1
12-05-2023, 07:48 AM
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Cam profiles for boost
It would be good to discuss cam profiles for boost on a street engine. Lets say low boost (less than 8) with a roller or hyd roller cam. With the availability of low cost belt driven blowers its time to get the info posted.
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#2
12-05-2023, 09:37 AM
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JMO In very general terms for 8 psi (super charger) cam verses an N/A cam. A couple more degrees LSA, a couple of degrees less cam advance, and about 6 degrees more exhaust duration.
Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
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#3
12-05-2023, 02:47 PM
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Here's two custom centrifugal supercharger cams that I had ground for my old 406 back in 2011. Two different approaches for the same motor. These both are HFT, I didn't proceed and stuck with nitrous...
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 Johnny US Army Retired1978 T/A 463 Pontiac, KRE 74cc 300CFM D-ports, Howard's custom SFT, Nash Intake,QFT 950 E85 carb, TCI TH-350, 4200 converter 3.73 12 bolt 11.24@118.33mph 1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car. 1972 LeMans 350 Pontiac H/S Drags project |
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#4
12-07-2023, 08:25 AM
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Quote:
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#5
12-07-2023, 12:30 PM
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As for profiles, I have started using the HLO and HUC lobe families (CompCam) for boosted motors. A recent customer had valvetrain damage with his previous cam - he was sold a cam with LSK lobes, and this was a motor putting 1,000+ to the wheels!
Overall design, boosted motors don't need much intake duration, and very little overlap. I open the exhaust valve sooner with supercharged motors, and even a bit earlier with turbo motors.
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'73 T/A (clone). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 315rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'. '67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust |
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#6
12-10-2023, 05:43 PM
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GT |
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#7
12-13-2023, 10:02 PM
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Pick whatever cam you would like NA and add boost, it will just make more power. For an all-out race motor go custom.
Last edited by 70 bird; 12-13-2023 at 10:17 PM. |
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