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Thread: Where did my power go?

  1. #1

    Where did my power go?

    I went to the drag strip this weekend. My car ran 11.2s two weeks ago. This weekend it was running high 11.6s to low 11.7s. The only thing I did to the car between trips to the track was change the oil, charge the battery, & adjusted the tranny brake. I'll confess that I pulled a bonehead move and tried to start the car with the carb cap still on. I only did it once. The car runs OK, it's not right. Why did I lose 4.5 tenths? Car info and things I've tried are below. The only other thing, is that 2 weeks ago I was getting a puff of smoke sometimes when lifting off the gas at the end of the quarter (exhaust guides maybe going bad).

    Car info:
    1983 Cutlass
    Chevy 350
    Proline Heads
    Victor Jr Intake
    Holley 750
    MSD 6-AL with external 2-step
    MSD Blaster 2 coil
    2-spd powerglide with tranny brake
    Ford 9 inch rear with 513's
    30x9x15 slicks

    Things I've tried:
    reset the valves
    adjust the timing
    swapped distributors
    swapped 750 carbs
    replaced 3 spark plugs that looked a wet
    verfieid battery voltage.
    This week I'm going to try changing all the plugs and putting a new set of plug wires on the car.

    Help?!?! What else should I try. Where'd my power go?

    Thanks

  2. #2
    Senior Member RACING JUNKIE jmarksdragster's Avatar
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    Oil change ond plugs.
    Mark Whitener
    http://racingfuelsystems.myfunforum.org
    __________

    Good work isn't cheap, and cheap work can't be good.

  3. #3
    Senior Member RACING JUNKIE
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    WHEN YOU RESET THE VALVES WAS THE LASH STILL WHERE YOU SET IT?I had this happen once and blamed it on the weather and everything else...but it got slower every pass up until a lifter broke and destroyed the engine. Looking back I think it got hurt the week before and it was telling me there was a problem (slowing down) and I ignored it...payed for it too. If any of them were loose I would look at the lifters if it is a solid roller.

  4. #4
    Quote Originally Posted by Tod74
    WHEN YOU RESET THE VALVES WAS THE LASH STILL WHERE YOU SET IT?I had this happen once and blamed it on the weather and everything else...but it got slower every pass up until a lifter broke and destroyed the engine. Looking back I think it got hurt the week before and it was telling me there was a problem (slowing down) and I ignored it...payed for it too. If any of them were loose I would look at the lifters if it is a solid roller.
    Yeah, lash was still OK. I'm running a solid roller. Only a few were slightly off from where I'd set them last time. Nothing to fire off any alarms...

  5. #5
    Senior Member RACING JUNKIE
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    I Wonder if the converter is about to take a dump?

  6. #6
    Quote Originally Posted by Tod74
    I Wonder if the converter is about to take a dump?
    Guess it's definitely a possibility...

  7. #7
    Senior Member RACING JUNKIE
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    I definetley change "ALL" the plugs out.
    If you had some that were wet from the cap being left on the carb its a strong possiblity that the others arent in the best of shape, change them out and go back with your original set-up, I.E< carb, dist, timing etc.

    Goodluck, Charles
    ***IN GOD WE TRUST***

  8. #8
    Senior Member SENIOR BUILDER
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    Wellington , New Zealand
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    Temprature??????????????
    "The only thing better than Cubic inches is more of them"


    GO THE ALL BLACKS!!!!!!!!

  9. #9
    I am wondering if you created a leak in the intake manifold or the carb. gasket when you tried to start it with the carb. cap on.

    An easy way to check this is an old backyard method take a can of shaving cream,start the car and put a small amount around the carb.gasket and intake manifold gasket pay close attention if you see the shaving cream dissapear somewhere, you have a leak.

    P.S. don't feel bad I did the same thing several years ago good luck.
    Big Chief head beginner


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