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Miles

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Posts posted by Miles

    A One Inch Diameter Brake Master Cylinder for the S30 Z Cars

    in Brakes, Wheels, Suspension and Chassis

    Posted · Edited by Miles

    On 6/25/2025 at 8:00 AM, Matt90Gt said:

    has anyone tried to use a 1.00" bore master cylinder from a 96-98 Mustang v6?  Looks like you would remove the studs.  If that bolt pattern is compatible, it could be an easy swap

     

    Just use a 1979 280xz MC as it bolts on and it has the correct metric threads in the output ports.  The downside of going to a larger bore MC is that the pedal will be stiffer and requires more foot pressure to stop. This can be corrected on the 240z  that uses a 7in. dia. booster by going to a larger 81/2 in. dia. 280z booster.  If you do this booster swap you will need to swap the 240z booster push rod into the 280z booster so the booster push rod connects to the brake pedal like stock. 

     

    My brake set up: Brakes are excellent.

    ·       Front:1979 Toyota 4x4 pickup S12+8 calipers with 240z stock solid rotors.

    ·       Rear: 1989 240SX calipers with 1984 non-turbo 300ZX solid rotors. Modern Motor Sports adapter bracket (NLA)

    ·       Master Cylinder: 1979 280ZX 15/16. sourced from Arizona Z Cars

    ·       Booster: 1977 280Z.  Barely fits between throttle bracket and clutch MC (Wilwood Compact).  Brake feel is excellent.

    ·       Brake Pads: Carbotech AX6. Excellent cold bite and does not fade when hot. Perfect daily driver pad.

     

     

     

    1978 Datsun 280z No Acceleration Above 4000 RPMs

    in S30 Series - 240z, 260z, 280z

    Posted

    Go to ZTherapy and buy this video: 

     

    “JUST SU’S”

    British HS6 and Hitachi “SU”

    https://ztherapy.com/just-sus/

    Watch the video until you name every part and understand how the SU works.

    You are experiencing a lean condition.  Note that the throttle shaft on the SU tends to wear out allowing air to leak into the carb causing a lean condition. This air leak makes proper mixture adjustment impossible.  Contact Ztherapy for the fix.

    • Like 1

    Chevy 350 Auto to Manual transmission swap

    in Gen III & IV Chevy V8Z Tech Board

    Posted · Edited by Miles

    1989 Camaro T5 mated to SBC 350

     

    Basics 

     

    1. T5 transmission:  The 1989 WC T5 transmission is tilted 15 degrees towards the driver.   The 15 deg tilt is absolutely no problem, I have done two just cut away the trans tunnel as in the picture below. The tilt is not noticeable once center console is installed. Unless you want to make a special transmission mount, you will need an 89 Camaro T5 bell housing, driveshaft, flywheel, clutch pressure plate/disk, throw out arm, throw out bearing, clutch slave and a 7/8" clutch MC.  Note that there is a V8  and a V6 version of the T5 transmission. They have different spline counts.  You will need the V8 version.

    2. Bell Housing:  1989 -90 bell housing for V8. Verify that the pivot ball is in place as that part is NLA.

    3. Flywheel: 158 tooth flywheel:  https://www.summitracing.com/parts/zzz-50-6516

    4. Clutch Kit: Zoom High Performance Clutch Kits HP1675-1A https://www.summitracing.com/parts/zzz-hp1675-1a/applications/

    5. Clutch Hydraulic Components:

    6. Clutch Hose and Fittings:

    6. Starter: Hitachi gear reduction starter or similar unit.

    7. Complete 240z brake and clutch peddle assembly swap.

    8 MSA/JTR transmission mount

     

    See my post of 12 June 18 second post down  lots of pictures

     

    DSCF0559.JPG

    • Like 1

    Sorry - another rear-end clunk

    in Drivetrain

    Posted

    I solved rear end clunking in my 72 240z by replacing al of the rubber bushings with polyurethane bushings including the mustache bar mounts and solid mounting (MSA mount)  the nose of the differential.  Of course the differential is still a little playful, but every Z I have owned had a "loose" differential that would clunk when engaging the clutch. I learned to engage the clutch smoothly. No problems in 20 years.

     

    • SBC 350  v8
    • Camaro WC T5 trans
    • 78 280z r200 differential
    • Chequered Flag stainless steel stub axles.  Replaced the stock stub axles because the wheel  mounting flanges were warped causing my rear 240sx caliper brake pads to rub on the rotors. Over heating rotors drove me nuts until I put a dial indicator gauge on the flanges and rotated the axle.  Evidently the flanges are soft and can become bent/warped just hitting a curb or a pothole.   Not a problem for drum brakes, but with disk brakes the rubbing can cause rotors to heat up.
    • Thanks 1

    Driver's window glass falling off track

    in S30 Series - 240z, 260z, 280z

    Posted · Edited by Miles

    " I do not have the window frame installed yet. "

     

    Install the window frame and adjust as needed.  All frame bolts must be tight as they pull the frame into the correct geometry.

     

    Here is a book that I used to to do two 240z restomods.  Gives details on how to disassemble, restore and reassemble a 240Z.  Lots of pictures with step by step instructions.

     

    How to Restore Your Datsun  Z-Car

     

    by Wick Humble

     

    available on Amazon

    Installing hatch glass- not working

    in S30 Series - 240z, 260z, 280z

    Posted

    I never had success with Vintage Rubber  hatch or windshield seals on two 240z projects.  I ended up using stock OEM seals.  I recall getting the OEM seals from Courtesy Nissan and Motor Sport Auto (MSA).

     

    The problems I had with  Vintage Rubber were deformed corners  making it impossible to install.

     

    I used the rope trick and installed the stainless steel center trim in the windshield and hatch seal before installing the seals using the rope trick.

     

    Also, Vintage Rubber door seals were too thick  making it impossible to close the doors. I went to Pep Boys and bought generic door seals that squeeze onto the door opening pinch welds.

     

    The problems with Vintage Rubber seals has been known for over  20 years.  Lots of info here on HybridZ.

     

    There is a company that makes the windshield and hatch seals without the center stainless trim.

    Mk63 Brake Bleeder Screws

    in Brakes, Wheels, Suspension and Chassis

    Posted

    Another option would be to use the 1979 Toyota 4x4 pickup front calipers for solid rotors which are plentiful and cheap.  Using Carbotech AX6 pads with the Toyota calipers works well with my set up:

     

    • 15/16 MC
    • 9 inch dia 280z booster.  Swapped the 240z brake pedal push rod into the 280z booster for stock connection to brake pedal. 
    • Front: Toyota calipers for solid rotors. Used SS braided line to connect hard line to caliper to eliminate the Toyota "S" tube.
    • Rear: 89 240sx rear calipers with 1984 non-turbo 300zx rotors
    • Carbotech AX6 pads front and rear

    SU carb question....SM needles, 5.5 turns down.....wow

    in Fuel Delivery

    Posted

    If the SU carb has an air leak, it will create a lean condition for which no amount of tuning will correct.

     

    The problem with the SU carburetors is that the throttle shaft becomes worn and allows air to seep past the shaft and into the carb causing a lean condition.

     

    You can try contacting ZTherapy who specializes in  SU carbs and parts.  Also they sell a video called "Just SUs" it explains how to repair and tune the SU carb.

     

    Just SUs video covers:  4 hrs of advanced college level theory of operation, diagnostics, tuning, surgical Weber removing and disposal.  Covers all years of Japanese Hitachi "SU" and 1.6L-2.0 Volvo HS6 1 3/4" SU (HS4, HS2 same).  Our newest video, 4 years in the making.  Directly replaces the first 1.5 hrs of ZTV01. Heavily updates and corrects info from ZTV01.  Part one is inspecting and  installing new ZT carbs and "Tuning for Dummies".
    Part two is "Installing and Tuning a ZT Master Tuneup Kit for Dummies".  Balance of tape is answering common questions, racer tech and mods, airflow studies, horns, cold air box, etc. We address the Q+A sessions from the 2000 MSA and LSV shows-I worked hard to answer your questions on this video. If this does not answer every issue you ever had about the mighty SU, call me!  If you still don't get a satisfactory answer, demand your money back!!!  Ships free with new ZT carbs and the ZT MasterTuneUp kits.   Available in single play mode on two 2 hr SP tapes for $20 or on one single EP mode tape for  $15 (lower video quality). DVD available for $25

     

    https://www.ztherapy.com/

     

     

     

    Oh boy another S12+8 Caliper Thread - I.D. my setup

    in Brakes, Wheels, Suspension and Chassis

    Posted

    15 hours ago, SNKBT1 said:

    Miles, how did the Carbotech ax6 pads work out for you?  I track 2 times a year but mostly street drive. Thanks for any info.  

    The best performing pads that I have tried on my SBC 350 240z.  I have tried all of the  Porterfield, Hawk etc pads and  they suck in comparison.

     

    My brake setup: Carbotech Ax6 pads work really well with this setup.

     

    • Front:  1979 Toyota 4x4 pickup calipers for solid rotors. Direct bolt on.
    • Rear: 1989 240sx rear calipers
    • 1979 280zx 15/16 in. master cylinder
    • 1978 280z 9 inch booster.

     

    Notes about Ax6 pads:

    • Excellent cold bite which is great for a daily driver.
    • Dusty at first, but I don't care.  Stopping performance is what is important.
    • No sign of fading!!!
    • No noise

    Buy direct from Carbotech.  Carbotech staff is helpful and courteous.

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