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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 292CFM D-ports, Lunati VooDoo, V-max lifters, TKII, ATM 850 E85 carb, TCI TH-350 race tranny, 3600 converter 3.73 12 bolt 11.63@116.68mph 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. 1980 Formula 350 Pontiac back burner project 1972 LeMans 350 Pontiac |
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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 My webpage http://lnlpd.com/home |
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#6
12-10-2023, 05:43 PM
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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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