Best valve springs for road course

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Thread: Best valve springs for road course

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    SupraForums Member rallly's Avatar
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    Best valve springs for road course

    GSC Conical, Beehive or Dual.

    Single turbo Supra for time attack/HPDE.


    Thanks!

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    SupraForums Member motorheaddown's Avatar
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    '97 sc300 T71GTS 6-speed direct port nitrous
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    Super Moderator Wreckless's Avatar
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    Quote Originally Posted by rallly View Post
    GSC Conical, Beehive or Dual.

    Single turbo Supra for time attack/HPDE.


    Thanks!
    I'd call GSC and ask, since the options are largely theirs, but my best guess is the GSC beehives, as they offer good resistance to valve float without having tons of seat pressure that beats the hell out of the valve seats.
    Jeff
    "I spent a lot of money on booze, chicks and fast cars. The rest I just squandered." -- George Best
    Quote Originally Posted by KING View Post
    Who would have ever thought.....the impact an automobile can make.....

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    David (NJ)

    Let me see if I can answer this: conical. Is there a question about this? No. Is it a close call? No.

    That said, the cam manufacturer will tell you what seat pressure, valve lift, and open pressure you will need depending on the rev range. Just the rev range for the Supra without a dry sump isn't that high. The other limiting factor is that it has a flat tappet cam with a relatively small for a directing acting cam 31mm bucket. It just isn't that radical. For comparison, many (most these days) pushrod engines, the Ford Coyote, and the Hondas have roller cams. It doesn't mean the cams are more radical in terms of duration, but the can be in terms of the speed off the seat, rate of opening and closing, and lift.

    Lost of springs will work. Just the conical will work better and be easier on the cam and the valves.


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    Boost Junkie 1A1's Avatar
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    Just call GSC and ask for Greg. They used to road race a Supra in One Lap and know a bit of what works.

    Steve


    1993.5 Anthracite 6 SPD//PRO EFI//PTE6766//3-Row//E-85Fuel Sys//PHR I/M//GSC//IP 10/1 motor//Manley//RPS C/C//CCW C14//Brembo BBK//TRD LSD//930WHP/38PSI
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