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Thread: Tune Up Trouble

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  1. #21
    Yoda
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    Re: Tune Up Trouble

    Quote Originally Posted by dcarlg View Post
    Quick Update:
    Looks like I have bolts (instead of studs and brass nuts) at the downpipe/exhaust manifold flange. Yellowish. Grade 8? ...
    Grade 8 bolts should have five radially-spaced tick marks on the head (Grade 5 have 3).

    EDIT/CORRECTION: Grade 8 should have SIX tick marks (should be 8, but that's another thread ) Thanks, Steve.
    Last edited by Bob_Spidell; 07-23-2019 at 09:33 PM.

  2. #22
    Yoda steveg's Avatar
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    Re: Tune Up Trouble

    I'm using tube headers now, but, FWIW, have found grade 8 lock washers keep their springiness when used on the exhaust manifold studs.
    Steve Gerow
    Altadena, CA, USA
    Maker of most complete Big Healey rear disc kit
    Check out my galleries:
    http://www.pbase.com/stevegerow


  3. #23
    Jedi Knight Keith_M's Avatar
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    Re: Tune Up Trouble

    I had a similar problem earlier this summer. I finally traced it to a sticking carburetor piston, which prevented the piston from dropping all the way. After fixing the piston, I realized that the carburetor was running too lean, presumably because I was tuning it with the piston stuck. Once I fixed the piston and retuned the carb, the popping and backfiring stopped.
    Keith
    '59 Bugeye (recently restored)
    '62 BT7 (recently restored)
    '65 Sprite (restored 30 yrs ago)

  4. #24
    Jedi Trainee Joe Schlosser's Avatar
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    Re: Tune Up Trouble

    You need to hear the nice click when the piston drops down onto the bridge.
    And all the pistons should slide down the chamber equally
    Joe Schlosser
    SCCA National License, Retired
    60 Bugeye, since 1966
    SCCA FP, sold but not forgotten

  5. #25
    Yoda John Turney's Avatar
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    Re: Tune Up Trouble

    Quote Originally Posted by Joe Schlosser View Post
    You need to hear the nice click when the piston drops down onto the bridge.
    And all the pistons should slide down the chamber equally
    Also, lower it slowly with your finger underneath, sometimes they will sound ok if you let them drop, but may hang up within 1/8" from the bottom.
    John, BN4

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