newbie to roots blowers ?????
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newbie to roots blowers ?????

  1. #1
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    Default newbie to roots blowers ?????

    I have a few questions that I know some of you guys can answer. first I am new to the whole supercharger deal. I have built and owned several big inch na and n20 motors as well as turbo motors but I am lost when it comes to a roots blower. the motor is a 522 with a blower shop 871 no cooler. What is a good ball park to start out with timing wise? the heads are aluminum. also the intake has 2 -8 fittings that I am assuming are water dumps? do I need these? lastly this is probably a dumb question but where do you put the oil in the blower? lol!!! take it easy on me guys I am learning as I go.
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    Senior Member bwurst1's Avatar
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    You should have a plug or pressure button on the front cover that's where the oil goes. Im assuming your intake has the -8 in the rear? yes those are water ports. I run a equalization line between the two and dump out the front thermostat housing. The timing is not as straight forward to answer. Need more info like What % are you running the blower at? How much compression? What type of fuel are you using? What are your plans for this motor? Race/fun? I'm running a 6-71 @11.7%over on a 506 with alum. heads. My total timing is 28deg. Its a little conservative but the motor likes it there.
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    Quote Originally Posted by bwurst1 View Post
    You should have a plug or pressure button on the front cover that's where the oil goes. Im assuming your intake has the -8 in the rear? yes those are water ports. I run a equalization line between the two and dump out the front thermostat housing. The timing is not as straight forward to answer. Need more info like What % are you running the blower at? How much compression? What type of fuel are you using? What are your plans for this motor? Race/fun? I'm running a 6-71 @11.7%over on a 506 with alum. heads. My total timing is 28deg. Its a little conservative but the motor likes it there.
    So when you say 11.7% do you mean 11.7PSI of boost?

    Thank you
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    I'm thinking overdrive on the blower
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    Yup 11.7% overdrive on the blower
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    Thank u what boost buddy
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    The gauge reads 10/11lbs unsure how accurate that is. Ive got it mounted on the dash with about 12 feet of a -3 Teflon braided line. Does anyone know if u lose pressure in a long line like that?
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    Sweet, no u lose no psi.
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  11. #9
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    can I dump the water out of the two pports in the rear? one on each side of the boat or is it better to dump it out of the t stat housing?
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  12. #10
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    NO!!!!
    You can tee them together as a balance, or tee them with one line over board, but keep it on the small side. Like maybe a -6. But the majority of the water has to leave the front of the manifold.



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