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Last Post 07 Feb 2012 01:29 PM by  Marshall Grice
SP Clutch Actuation Justification
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ratt_finkel
Veteran Member
Veteran Member
Posts:1650


--
06 Feb 2012 04:47 PM
    "P. Any metal clutch assembly, metal flywheel, or metal torque converter
    that uses the standard attachment to the crankshaft may be used.
    Non-metallic friction surfaces (e.g., clutch disks) are permitted. Dowel
    pins may be added. Any hydraulic clutch line may be used. Replacement
    or substitution of the clutch slave cylinder is permitted, but
    this does not allow non-original methods of clutch actuation (e.g. pull
    type versus push type)."

    The rule reads as such. Any clue why it's there?


    Major_Lee_Slow
    Basic Member
    Basic Member
    Posts:185


    --
    06 Feb 2012 08:49 PM
    For example, LT-1 powered 4th Gen Camaro's use a pull type slave cylinder with a clutch fork while the LS-1 powered 4th Gen Camaro's use an integrated throw out bearing/push type slave cylinder. Therefore swapping an LT-1 T-56 tranny into an LS-1 powered car may not be legal even though the cars are on the same line (there's other reason's this wouldn't be legal such as having to change the LT-1 tranny input shaft to an LS-1 input shaft).

    I know that doesn't answer your question as to why it's there, but here's an example of what it does prevent.
    Andy Hollis
    Senior Member
    Senior Member
    Posts:6197


    --
    07 Feb 2012 09:59 AM
    ratt_finkel wrote:

    The rule reads as such. Any clue why it's there?


    That restriction has been there forever. Back before people were using two-discs and such. My guess is that things have escalated so much since those early days that it is outdated. Have a chat with Stan and see if he can shed some light, as he was on the SEB the last time the whole clutch thing was looked at for SP.

    --Andy

    S_Whitney
    New Member
    New Member
    Posts:


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    07 Feb 2012 11:11 AM

    It was there from the C4 corvette BSP corvette days, maybe even pre LT1 motors. One of the trick clutch setups required a switch from pull to push style actuation. At the time that was considered too much of a change for SP, and no existing wording was there to make it clear.

    Marshall Grice
    Basic Member
    Basic Member
    Posts:303


    --
    07 Feb 2012 01:29 PM
    ratt_finkel wrote:
    "P. Any metal clutch assembly, metal flywheel, or metal torque converter
    that uses the standard attachment to the crankshaft may be used.
    Non-metallic friction surfaces (e.g., clutch disks) are permitted. Dowel
    pins may be added. Any hydraulic clutch line may be used. Replacement
    or substitution of the clutch slave cylinder is permitted, but
    this does not allow non-original methods of clutch actuation (e.g. pull
    type versus push type)."

    The rule reads as such. Any clue why it's there?


    it's there just to prevent us from running tilton carbon-carbon clutches. :-p

    exedy carbon-carbon is ok though because they have the patent on pull type clutch diaphrams. LOL

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