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Thread: Question concerning motor just shutting down?

  1. #1
    Junior Member SHOW GUEST
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    Question concerning motor just shutting down?

    My kid bought his first drag truck. For last month been just running it in the shop waiting on April to drag. It was running and just shut off, just like you turned the key off. We are getting spark, put on new msd plug wires,dist cap etc. When try to start it all most will but backfires really really bad about 5th turnover. Seems plugs are wet to after a while of trying to start. We put in new plugs and drained the gas,it ran we took it for a spin and parked it in shop, wouldnt start again. also when it was runnig had to go into the pedal easy or it would spit and spudder.. Plugs look wet again.Put in new plugs again no help. Any ideas would be apprecated. Any drag racers that would be willing to help in my area would appreciate you looking at it. will pay you. 1969 chevy c10-454 motor- bored ten over - Demon 850 carb-msd ignition- etc :?: Champaign/urbana Illinois-area

  2. #2
    Senior Member DYNO OPERATOR bixblk's Avatar
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    try these things

    It may be a couple of things
    it may have jumped time, check the timing
    it may have got some debri in the float bowls and the needle /seats are up and flooding the motor.
    maybe another problem with the carb, if you have another (known good carb) try swapping it
    Try those things
    jeff

  3. #3
    Senior Member EXPERT BUILDER
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    Yep, ditto on valve timing... had a couple circle track engines do that to me.
    Also had a guy bring me a circle track SBC that would only idle fair, but went crazy on throttle. I tried EVERTYHING... litterally, until tearing the engine down to find that he had put the top timing gear drive sprocket on backwards, and the timing was out 180 degrees. Turns out his top gear had a mark on the back side also, and he didn't notice it was flipped around backwards and he was looking at the wrong mark to time it.
    YES, it did run without hitting any rotating parts while 180 degrees out... he got real lucky... :shock:
    I talked him out of using the gear drive for stock class circle track racing, and we put in a chain drive correctly timed, and it runs like a champ with no other changes.

    Also ditto on the carb problem. I fought with a rebuilt carb that was doing the same thing. Put on a brand new carb and it cleared right up.
    I'm not hatin... I'm just sayin...

  4. #4
    Senior Member RACING JUNKIE mopar1968's Avatar
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    Yeah i agree jumped timing :!: :!:




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  5. #5
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    Jeff & those kind enough to respond to my boy & I.

    Thanks a million for the carb advive, we spent all afternoon cleaning it. We broke the entire demon 850 down , would spray the hec out of it with brake cleaner,then blow the hec out of it all with the air compressor. Then we would start over and do it again. Put the carb back on the 454 and she fired up so quick it scared us. Set the timing at 36 degrees while holding rpm's at 3,000. Man its running fantastic. Thanks again for the replys. Hope to see you folks at the track some time. Later.

    Barry & Travis - Central Illinois

  6. #6
    Senior Member DYNO OPERATOR
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    Get rid of the Demon, it will do it again. Get real Holley HP and put onit and then forget about it.

  7. #7
    Senior Member RACING JUNKIE curtisreed's Avatar
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    I have had 2 demons, still have one of them. Zero problems. The first we had on our sbc nova. Went to Ron's toilet and picked up zero e.t. both on alcohol.

    Curtis

  8. #8
    Senior Member RACING JUNKIE
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    Quote Originally Posted by doorracer
    I have had 2 demons, still have one of them. Zero problems. The first we had on our sbc nova. Went to Ron's toilet and picked up zero e.t. both on alcohol.

    Curtis
    Not being a wise guy but you had something wrong if you didnt pickup from going from a demon to a toilet .. that was a easy tenth gain 8)

    I had a gas demon carb it was pretty good carb ..not fast by any means but was consistent.
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
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  9. #9
    Senior Member RACING JUNKIE curtisreed's Avatar
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    Quote Originally Posted by hammertime
    Quote Originally Posted by doorracer
    I have had 2 demons, still have one of them. Zero problems. The first we had on our sbc nova. Went to Ron's toilet and picked up zero e.t. both on alcohol.

    Curtis
    Not being a wise guy but you had something wrong if you didnt pickup from going from a demon to a toilet .. that was a easy tenth gain 8)

    I had a gas demon carb it was pretty good carb ..not fast by any means but was consistent.
    I don't think you are being a wise guy. We heard the same thing from a lot of people and I expected some myself. The motor was tuned with the carb on the dyno before it went into the car and we put the car on a chassis dyno after changing over to the toilet. Saying it is an easy tenth is a pretty broad statement that I'm not sure covers all cases.


    Curtis

  10. #10
    Senior Member RACING JUNKIE
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    Quote Originally Posted by doorracer
    Quote Originally Posted by hammertime
    Quote Originally Posted by doorracer
    I have had 2 demons, still have one of them. Zero problems. The first we had on our sbc nova. Went to Ron's toilet and picked up zero e.t. both on alcohol.

    Curtis
    Not being a wise guy but you had something wrong if you didnt pickup from going from a demon to a toilet .. that was a easy tenth gain 8)

    I had a gas demon carb it was pretty good carb ..not fast by any means but was consistent.
    I don't think you are being a wise guy. We heard the same thing from a lot of people and I expected some myself. The motor was tuned with the carb on the dyno before it went into the car and we put the car on a chassis dyno after changing over to the toilet. Saying it is an easy tenth is a pretty broad statement that I'm not sure covers all cases.


    Curtis
    When both are right with the correct cam/conv change after toilet installed its almost a guarnteed pickup, think of the way the fuel is brought into each hole. What was your setup on the toilet if you remember ? like BV leak down, Nozzels, Pill, color of BV and most important pump and size of it ?
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com


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