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gn or other roots experts

  1. #1
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    Default gn or other roots experts

    Was wondering if you think an 871 is enough blower for a 586" blower moter. 8.8:1, it has fully ported pro1 345's, two 1150's done by pro systems, bullet cam .750 lift cant remember duration exacly but like [email protected] 050, lee intercooler. my problem is i cant get the rpms. took it out today 5900 at 5psi of boost. Use to run 6200 w 8psi of boost. boat has an agressor A. am i dreaming to think this thing should make 1100 to 1200 hp and i should see 6600 to 6800 rpms? My builder sid i should see about 6800 to 7000 rpm with an A cut.

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    also i am 2.2% over to run that 5 psi of boost. would i be better off with a 14-71?

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    something just don't sound right. my little old 468 w/ an agressor A (they
    say is comp. to a berk AA) would turn 6400-6600 all day long with a 12-71
    at I think 2% over , making 16lbs boost /of coarse 116oct. fuel. what
    lobe I ran was a custom grind, but baby compared to yours- 112lc, 655/678 lift , 268/272 @.050 but it ran EXTREMELY WELL! turn up the
    boost, put some good gas in it, and see what it it will do!

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    Quote Originally Posted by sam805 View Post
    also i am 2.2% over to run that 5 psi of boost. would i be better off with a 14-71?
    My question is what happened to change the RPM and boost level, a 14-71 might be a better match for 586 CI especially if you have a dry sump and crank trigger set up
    If you ain't the lead dog the view is always the same !

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    and yes, you would be better off with a bigger blower, with that amount
    of cubes

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    i changed pulleys. Before i ran 42 on top and 49 on bottom and today i ran 45 on top and 46 on bottom. Granted before was four years ago. should i still run the intercooler with a 14 71?

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    gn7
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    Whoa, whoa. What is all this about a 14-71. Is this a pump gas deal. I assume it is or you would be running the blower harder than that. Why the hell would you go to a 14-71? Just to slow it down to a crawl so it leaked more. He is already running the 8-71 butt slow.
    Your at damn near 9 to 1 compression, and 5lbs of boost, your creeping up on the limits of pump gas now. I don't know your timing, but you MIGHT be able to get away with 5% on the blower, but its edgey.
    I have no idea how much power it takes to turn your impellor. I wouldn't know a A from a AA if it hit me in the head. But that piece is cammed and headed for way more boost than 5lbs. When you run a motor a 5lbs, you almost have to treat it like its N/A. Too much head, too much cam.
    Take the same piece, throw some 116 in the tank, crank 32 degrees in the dizzy, push the blower up to 20-22% over with 16lbs of boost and bring a change of underwear.

    The thing wants to run 7000+ It just can't do it with the boost pressure. Its all miss matched. It will never run right till it sees at least 12 lbs.
    But on pump gas, you'll be picking piston pieces out of the pan in less than 5 mins.

    If your engine builder knew you were going to run this on pump, go kick his ass!



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    Last edited by gn7; 10-01-2010 at 08:26 PM.

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    ok gn 7, yesterday i was running a 110/91 50-50 mix. Timing was set at 28 degrees. All i have access to is 110. Do you think I will be ok at 32 degrres and 12 psi of boost with 110 octane? With an A it would take around 1050 1100hp to turn 7000rpm the same hp to turn my impellor 6600-6700. Also without changing major components what kind of hp could i make on pump gas? I am willing to change pistons cam etc, but i would like to keep block, heads blower etc. What components should i change and to what to maximixe hp on pump gas? Can i make a 1000-1100hp on pump gas with the roots setup? Thanks guys.

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    Quote Originally Posted by gn7 View Post
    Whoa, whoa. What is all this about a 14-71. Is this a pump gas deal. I assume it is or you would be running the blower harder than that. Why the hell would you go to a 14-71? Just to slow it down to a crawl so it leaked more. He is already running the 8-71 butt slow.
    Your at damn near 9 to 1 compression, and 5lbs of boost, your creeping up on the limits of pump gas now. I don't know your timing, but you MIGHT be able to get away with 5% on the blower, but its edgey.
    I have no idea how much power it takes to turn your impellor. I wouldn't know a A from a AA if it hit me in the head. But that piece is cammed and headed for way more boost than 5lbs. When you run a motor a 5lbs, you almost have to treat it like its N/A. Too much head, too much cam.
    Take the same piece, throw some 116 in the tank, crank 32 degrees in the dizzy, push the blower up to 20-22% over with 16lbs of boost and bring a change of underwear.

    The thing wants to run 7000+ It just can't do it with the boost pressure. Its all miss matched. It will never run right till it sees at least 12 lbs.
    But on pump gas, you'll be picking piston pieces out of the pan in less than 5 mins.

    If your engine builder knew you were going to run this on pump, go kick his ass!
    X2 GN-7 knows best ! My maybe was if you ran E- 85 or alky
    If you ain't the lead dog the view is always the same !

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    Spin It!!! and Spin It!!!

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    ok i cant get back out for a couple weeks but im gonna run 42 up top and 50 on bottom for 19percent over on 110 at 32 degrees and see what it'll do. or should i step the overdrive up more?

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    gn7
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    You should be OK, and it will run much better, Its going to be a much happier motor. As for pump gas, the limit is about where you were.



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    One last question gn. on race gas and at 12-14 psi of boost is the intercooler doing that much or just restricting boost. I just have a lot more pulley options w out the intercooler w the pulleys i have. but if it is helping to make power or helping to prevent detonation even w race fuel than i am ok with it if it is killing a couple psi of boost. It is a lee intercooler.

  14. #14
    gn7
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    It helping. With the setup your talking about running, I would be leary of any more than maybe 28* timing with out the cooler. Your compression/boost is pretty close to what I run most of the races. Its reliable at that setup. If you were running the drags, you might be able to take out the chiller and leave the same OD ratio. You never really said what it is you do with this boat. recreational, or drags, or....? With the pump gas set up I was assuming it is a recreational boat. If so, leave the chiller.



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    Last edited by gn7; 10-03-2010 at 09:18 PM.

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