Motor turn over..
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Motor turn over..

  1. #1
    I'm No Expert Shaun's Avatar
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    Default Motor turn over..

    I've noticed that after warm ups on nitro motors they hook a rachet up to the blower and turn the motor over a few times. Whats the purpose of this? Want to say i've seen alky motor guys do the same?

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    Quote Originally Posted by Shaun View Post
    I've noticed that after warm ups on nitro motors they hook a rachet up to the blower and turn the motor over a few times. Whats the purpose of this? Want to say i've seen alky motor guys do the same?
    to keep the cyl's & heads from getting excess fuel in them...preventative maintainence to make sure u dont have fuel in them to cause a blower explosion ...its been done this way for years...both T/F & Alky

    FastRat

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    turn it backwards.

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    I'm No Expert Shaun's Avatar
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    Thats kind of what i figured.

    Quote Originally Posted by Fiat48 View Post
    turn it backwards.
    Why backwards?

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    i was at a drag boat race some five years ago and a team was thrashing on a blown motor doing the long ratchet on the snout when BOOM the most awful
    explosion i have ever been near blew the blower into a thousand pieces and i could not here for about an hour no one was hurt and these guys didnt say a word to each other the just went back at it.. mag switch was left on.

  8. #6
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    Backing the fuel down. Called "Back the motor" down. Turning the motor backwards is turning the pump backwards and you can guess from there.
    Yeah....LOL....Mag off. They won't forget next time.

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    Senior Member Morg's Avatar
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    Next time you are at a spring car race, you will notice the push guys will pull the car backwards after it has stalled, before pushing to restart. I am guessing the same deal.
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    If liquid nitro is left in the cylinders, it will leak past the rings, float on the oil, and murder the oil seals in minutes......You can't get it all out, but turning the motor backwards will force it out without compression forcing it past the rings....Old school, not sure with the modern systems.....Ray
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    Senior Member EdonShano's Avatar
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    I have run both Top Alcohol and Injected nitro...if we "stalled" a alcohol motor, I would kill the pump, kill the mag. and back off with the big ratchet...other times I'd leave the starter on with the mags grounded/ pump off and spin the motor..too much fuel in the cylinders could cause the motor to hydralic/lockup and the damage begins..now in the Injected nitro (A fuel cars) nitro doesn't ignite like alcohol.but you compress it enough it does pop...so when we bring the car back from a run, cylinders still have some fuel. we pull the plugs inject air thru the fuel system and put the starter back on and spin the motor until we have no fuel coming out of the pipes or spark plug holes.Have seen too many times in the pits where guys weren't "cleaning" out the motor..tends to drop the pan for you...

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