Do carbon deposits on the piston increase the compression ratio and compression test?

Discussion in 'Small Block Tech' started by garybuick, Jan 5, 2010.

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  1. garybuick

    garybuick Time Traveler

    Re: Do carbon deposits on the piston increase the compression ratio and compression t


    Sean,

    what did you run without the nitrous? what octane did you use? what kind of car were you running? Thanks for your insight.
     
    garybuick, Jan 6, 2010
    #21
  2. K0K0

    K0K0 Jamie

    Re: Do carbon deposits on the piston increase the compression ratio and compression t

    Have you ever pulled a head off to replace a leaking head gasket( water into the cylinder) and notice how clean it is compared to the others.This makes me a believer in distilled water remove carbon.
    Jamie
     
    K0K0, Jan 7, 2010
    #22
  3. New SBB

    New SBB That HURT

    Re: Do carbon deposits on the piston increase the compression ratio and compression t

    more octane inherently burns less completely. One byproduct is carbon. Over time it builds up. You should be able to tune the engine for lower octane gas when running low compression, which is an attribute of the Buick.
     
    New SBB, Jan 7, 2010
    #23
  4. CJay

    CJay Supercar owner Staff Member

    Re: Do carbon deposits on the piston increase the compression ratio and compression t

    Gary's 350 was not designed to run on 87. Even with the lower compression of 1973


    Gary, here's an idea- if your so worried about carbon deposits, get a boroscope and take a look inside the cylinders of your engine thorough the spark plug holes. They make a 45* mirror attachment so you can see the combusion chamber. That ought to save you the cost of tearing down a perfectly good running 40k mile original engine for no reason
     
    CJay, Jan 7, 2010
    #24
  5. garybuick

    garybuick Time Traveler

    Re: Do carbon deposits on the piston increase the compression ratio and compression t

    LOL Jason, no worries man, Im with you.. i aint in no hurry to take heads of my engine. haha.. .. but a boroscope sounds fun. ..
     
    garybuick, Jan 7, 2010
    #25
  6. 71stagegs

    71stagegs bpg member #1417

    Re: Do carbon deposits on the piston increase the compression ratio and compression t

    Jason the water was 87 octane in 73. Sunoco 260 blue magic I loved looking in the tank of 67 vette all that blue gas.Only problem was you went 10 miles and you were back again.LOL
     
    71stagegs, Jan 7, 2010
    #26
  7. CJay

    CJay Supercar owner Staff Member

    Re: Do carbon deposits on the piston increase the compression ratio and compression t

    Yeah, Sunoco 260 premium was 104...leaded! The old Wayne 511 Blendomatic pump! THey called it the Sun-dial. Im looking for a restored one.

    You ought to talk to Cobra Bob...he sold his 427 tri power Vette convertible for 2500 in 73 and he had to beg the guy to take it! At least you got 10 grand for yours!
     
    CJay, Jan 7, 2010
    #27
  8. 71stagegs

    71stagegs bpg member #1417

    Re: Do carbon deposits on the piston increase the compression ratio and compression t

    Just call me Dumb ass from now on.:ball: 26,000 miles org window sticker
     

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    71stagegs, Jan 7, 2010
    #28
  9. sean Buick 76

    sean Buick 76 Buick Nut

    Re: Do carbon deposits on the piston increase the compression ratio and compression t

    This was a 83 Buick Regal, nothing special just a beater car that I swapped a 350 into and sprayed... The 12s were with the nitrous on a basically stock 350...
     
    sean Buick 76, Jan 8, 2010
    #29
  10. Electrajim

    Electrajim Just another Jim

    Re: Do carbon deposits on the piston increase the compression ratio and compression t

    Seafoam, keep the engine temps cool, and back off the timing.
    You can run 87 octane if you really want to.

    ElectraJim
     
    Electrajim, Jan 8, 2010
    #30
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