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Thread: a brief look at clutches

  1. #1
    Join Date
    Jul 2008
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    Default a brief look at clutches

    look thru this
    http://auto.howstuffworks.com/clutch.htm


    your local area is sure to have a decent clutch shop that can sell you a nice heavy duty clutch and pressure plate assembly at a reasonable price, especially if you know exactly what to ask for, get friendly with the guys, youll be seeing them more than once

    standard diaphram replacement clutch

    Diaphragm pressure plates work well for street/strip applications, featuring maximum clamp load with minimum pedal effort, but have a bad habit of sticking to the floor in the cheaper designs if shifted at high rpms
    GM Diphragm Pressure Plates
    If you need a clutch for your everyday driver, this is the clutch for you. RAM clutch sets are the first choice of professional installers because each set contains the correct, top quality replacement parts to ensure proper fit and operation in your vehicle. Every RAM premium clutch set is backed by our five year/50,000 mile limited warranty.

    http://www.jegs.com/webapp/wcs/store...0002_752681_-1

    borg and beck style

    This type of clutch will increase the pedal effort in order to achieve the extra holding power, and may require strengthening of your clutch linkage components for proper operation. Roller, or centrifugal assist models are available for non-shifting applications such as clutchless transmissions, or where shifting is done below 6000 RPM.



    long style


    The Long Style is the preferred pressure plate for true competition clutch systems. These units provide a combination of static and centrifugal pressure. This characteristic allows setting up the clutch to suit the car and track conditions. Static pressure is provided by coil springs and remains constant throughout the RPM range of the motor. Additional pressure is provided by centrifugal force acting on the levers which impart this force to the pressure ring of the clutch. Centrifugal pressure is RPM sensitive, meaning the force increases as the engine RPM increases. Long Style clutches are available with fixed static and centrifugal pressure or with adjustable pressures to allow precise clutch tuning. Long Style clutches feature explosion resistant pressure rings, chrome vanadium springs for long life without loss of pressure, welded spring guide cups in a heavy duty cover, and all new heavy duty hardware. RAM can build Long Style clutches in any pressure range and with or without counterweight levers for non-shifting applications such as Lenco or other clutchless transmissions.



    Ive generally sellected one of the two lower designs in a 3000lb-3600 lb design for a serious BBC, and had them custom assembled by a good local shop

    once your over about 600 ft lbs of torque you may want a dual disk design




    BTW the upper clutch of the four in the thread above is easy to push in,smooth and quiet, but not nearly as strong as the lower designs,( its stock) the lower clutches are noticable harder to depress, and can be noisy because theres moveable weights and they tend too grab hard and faster , making the clutch engagement harsher but they tend too hold noticably better also

  2. #2

    Default

    I just installed a McLeod Street twin in my own car. They are a very nice clutch, but a little harsh on engagement due to the lack of a sprung hub & the large surface area of the 2 disks.

    After a day or 2 of driving, you will get used to the fast engagement & then you will forget it's there. They seem to be very reliable as I've done many of these on cars in excess of 600rwhp.



    FYI, This is a B&B/Long style pressure plate... a combination of 2 pressure plate styles. Long style levers and B&B cover.
    Last edited by Lonnies Performance; 08-18-2008 at 06:39 PM.
    Lonnie Pavtis
    Lonnies Performance Automotive

    http://www.lonniesperformance.com

    724-322-8505 9:00am-11:00pm eastern time - weekdays & weekends
    Celebrating our 10th year - 1999 to 2009
    Specializing in custom fuel systems, fuel injection components,
    suspension & all your supercharging needs.


  3. #3
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    florida
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    Default

    Lakewood Safety Bellhousings
    http://www.lakewoodindustries.com/
    or
    Quick Time Bellhousings
    http://www.quicktimeinc.com/products.html

    ALWAYS ask the tech support guys ALL the questions you can think of about clearances, compatability, suitability, ask for suggested matched parts, info, etc. BEFORE ordering parts

  4. #4

    Default

    A bit of info about the dual disk clutches.....

    They require more travel to fully disengage, so be very careful when setting up one of these.

    My car required drilling another pivot point in the cross shaft to gain more release travel at the clutch. They are hardened, by the way, so a regular bit will not drill them.
    Lonnie Pavtis
    Lonnies Performance Automotive

    http://www.lonniesperformance.com

    724-322-8505 9:00am-11:00pm eastern time - weekdays & weekends
    Celebrating our 10th year - 1999 to 2009
    Specializing in custom fuel systems, fuel injection components,
    suspension & all your supercharging needs.


  5. #5
    Join Date
    Sep 2009
    Posts
    23

    Default

    Very Informative!

  6. #6
    Join Date
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    Norco, CA
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    Default

    I moved all the info on CorvetteDon's car here

    http://www.gmcentral.com/forum/showthread.php?t=533



    2010 ZR1 Stock for now

    Spooky 2009 CTS-V Bone stock 12.36 @ 117

    Blue Meanie 2002 Z06 11.36 @ 120.67 448 rwhp/411 tq AFR H/C

    Wendy 06 GMC LBZ CC/SB EFI "Rat Posion", Sun Coast trans, SC 1057 & Transgo JR by MikeL, true downpipe, Banks Ram-Air SD sleeves 12.50 @ 107.50

    Big Blue04 GMC LLY 3500 SRW CC LB 4x4 DA Big Blue 13.12 @ 103.93 466RWHP/928TQ. PPE LLY extreme tune, VA Box, SC III by Inglewood Trans, 4" straight pipe, Super Diesel Tie Rod supports and Manifold, Trippin Pickup, Cognito Braces, FuzzyDice.

    McRat's toy-2005 GMC "Casper 2" 2500HD 4wd Xcab SB Mike L. LLY 2 trans, McRat tuning 10.59 @ 128.9

  7. #7
    Join Date
    Jul 2008
    Posts
    110

    Default

    Great info on clutches. Very informative.

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