mini blower combo

Discussion in 'High Performance Modifications' started by 350camaro, Apr 30, 2005.

  1. 350camaro

    350camaro Veteran Member

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    Will this combo get me into low 12's or high 11's 1/4 mile?
    377, 400 block, 350 forged crank
    Weiand 142 blower
    AFR 195's w/68cc chambers
    SRP 26cc dished pistons 8.2:1 cr
    Scat 6" I-beam rods 7/16 bolts

    Crane powermax hyd roller pn 119831 grind HR-284-2s-12 IG
    adv dur 284/292 0.050 dur 222/230
    Lift 0.543/0.563 with 1.6 rockers
    112 deg lobe spread

    Comp Cams pro magnum 1.6 roller rocker arms
    Holley 750dp with proform main body
    MSD street pro-billet dist w vac adv.
    2.5" dual exhaust

    Headers?
    I have 1 5/8 blackjack and hooker 1 3/4 supercomp, which would be better?

    Munci M20 wide ratio and 3.42 limited slip.

    I don't plan on revving the engine over 6000rpm.
    The car will be mostly street driven. I want the best of both worlds streetable and fast.

    ------------------
    81 camaro, starting 377 build-up

    350, GM forged crank, 10.2:1CR, AFR 195cc heads straight plugs, Edelbrock RPM intake, Holley 750 double pumper proform main body, comp cams 282S solid lifter cam, MSD street pro billit distributor and 6AL ignition, Hooker super comp headers, munci 4spd., Richmond 4.10:1 gears

    [This message has been edited by 350camaro (edited April 30, 2005).]
     
  2. tgw323

    tgw323 Veteran Member

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    With traction it should.
     
  3. Damon

    Damon Veteran Member

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    Yeah, it should. I'm running mid-high 12s on street tires with a milder setup than that (in a car that is not in any way built for drag racing). I don't think you even want to go that big with the cam. Seriously, I look at both one and TWO steps smaller in that cam line and that would probably be what you want.

    My experience with the little 142 is that you have to watch your cam choice very carefully. Bigger is definitely not better. You'll be blowing half the boost right out the exhaust with too big a cam and you can only pulley up the little 142 so far before it's all done and there ain't no bigger to go. Don't let durations well under 220* scare you- it's what you want with this little blower, especially with a roller cam that is going to flow much better than a flat tappet even though it's got less duration.

    The limit seems to be around 500HP. That's about all the air it can move. And don't expect much out of it over ~5000 RPMs. It's about the least efficient blower design you can get (straight-cut, 2-lobe). I don't take my engine over 6000 either because there's nothing up that high.

    My 383 combo with the 142 on top is:

    AFR 190 heads with 74cc chambers (basically identical to the 195s)
    Comp XE268 (224/230) flat tappet hydraulic ground on a wider 114* LSA. Wish I had gone one size smaller.
    -18cc dished pistons for 8.7:1 compression (still too high- wich I had dropped it more)
    Qjet 800 CFM carb
    HEI distributor recurved and fortified with vitamin MSD. Maximum advance around 28*.
    Cheap longtubes and 2-1/2" duals
    142 blower using the largest (7") bottom pulley and stock (3.07") top pulley- that's one step from maxed out. Boost gague shows 5 PSI in the intake wide open.

    I've laid 390 HP to the rear wheels with this combo and 420 ft/lbs. That's through a TH-350 automatic with a junk $75 no-name stock replacement converter that I have my doubts about.


    [This message has been edited by Damon (edited May 01, 2005).]
     
  4. Dirt Reynolds

    Dirt Reynolds Veteran Member Lifetime Gold Member

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    Damon - I wonder if you'd not make more power with a Holley double-pumper or HP750 on that combo?

    ------------------
    'Silver Bullet' 1977 Z-28 413" SB
    11.73 @ 115.10 on drag radials
    Old Vortec combo:
    12.15 @ 110.52
     
  5. Tokyo Torquer3

    Tokyo Torquer3 Veteran Member

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    Is that a blower cam? Don't go bigger on the cam cam if you want to keep it under 6000 rpm.

    That valve lift and the fast ratio of the 1.6 rockers spells valve float to me. Stick to the 1.5's and keep it in the low .500's lift with no more than 6000rpm if you don't want to risk valve float on the hydraulic roller. Ask me how I know. Choose valve springs very carefully.

    I think an 850 Holley will do you better. The extra fuel is insurance to help cool the engine, at the least.

    The 1&3/4 headers will be definitely a better choice.

    Check out the Holley 250 blowers. Will make a heap more power on that motor. Perhaps best blower size for small block on the street.

    http://www.alsblowers.com/sc500-250-256.html

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    1973 RS Z28: Littlefield race series 6-71 supercharger on a 355 w/ AFR 195 heads, 12-14 lbs boost, 7.6:1 static compression, CompCams hydraulic roller (276/288 advertised, 224/236 @.050 duration, .510/.527 lift w/ 1.52 rockers on a 113 lobe separation), AFR Hydra-Rev kit, Eagle 4340 Forged Steel crankshaft, ARP studded bottom end, Eagle ESP H-beam rods, TRW forged reverse dome pistons, Comp Pro-Magnum 1.52 roller rockers with 7/16 studs, twin 750 Edelbrock carbs, 1&3/4 inch Hooker Super Comps, 3" dual exhaust with cross over pipe. MSD 6AL ignition & Pro-billet distributor, Tremec TKO-500 5-speed, Moser 12 bolt with Eaton posi, 33 spline axles & 3.42 gears.
     
  6. 350camaro

    350camaro Veteran Member

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    I bought the cam about a year ago. Crane used to list that cam as a blower cam but after they canged there web page a year or so ago, they don't seem to advertise blower specific cams anymore.

    I have been looking at crane cams springs PN 99893-16, at 1.80" 149lbs with a spring rate of 391 lbs/in. That will give 149lbs on the seat and 360lbs at full lift, hopefully it will stay out of valve float. This seems to be the best spring I have found yet.

    I would like to build a blower motor that will fit under a 4" cowl induction hood, the 142 should fit

    [This message has been edited by 350camaro (edited May 01, 2005).]
     
  7. Tokyo Torquer3

    Tokyo Torquer3 Veteran Member

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    Those valve springs are about the limit for a hydraulic lifter, I think.

    I fit the first 162ci B&M blower (now discontinued) under a 2.5" cowl on a 73 camaro before. required some air cleaner tricks.

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    1973 RS Z28: Littlefield race series 6-71 supercharger on a 355 w/ AFR 195 heads, 12-14 lbs boost, 7.6:1 static compression, CompCams hydraulic roller (276/288 advertised, 224/236 @.050 duration, .510/.527 lift w/ 1.52 rockers on a 113 lobe separation), AFR Hydra-Rev kit, Eagle 4340 Forged Steel crankshaft, ARP studded bottom end, Eagle ESP H-beam rods, TRW forged reverse dome pistons, Comp Pro-Magnum 1.52 roller rockers with 7/16 studs, twin 750 Edelbrock carbs, 1&3/4 inch Hooker Super Comps, 3" dual exhaust with cross over pipe. MSD 6AL ignition & Pro-billet distributor, Tremec TKO-500 5-speed, Moser 12 bolt with Eaton posi, 33 spline axles & 3.42 gears.
     
  8. Eric68

    Eric68 Veteran Member

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    You should be able to get it into the 11's without the blower. Just use the stock 400 crank or an aftermarket 3.75" crank and build a 406. Bump the compression to 10.5:1 and pick a cam that matches your converter and rear end gears.

    Those heads will run and will make plenty of power on a naturally aspirated 406 . . . I'd save the $2 grand, forget about the blower, and build it NA the right way.

    ------------------
    68 Camaro with 383 SBC
    Best ET 10.97 @ 122.8 MPH all motor . . . and no trailer.

    [This message has been edited by Eric68 (edited May 01, 2005).]
     
  9. Damon

    Damon Veteran Member

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    Dirt- my choice of QJet is purely one of convenience. I had one off an old motor that I had tuned razor-sharp so it found it's way on top of this engine. A double pumper would work better, but not really in my application. I have ZERO traction so I slow up the secondary air valve opening to get it to "hit" softer off the line to try to hold traction. Really, it doesn't work. I still spin like mad but the "hit" of a double pumper would only be worse. So I leave it like it is.
     
  10. 80-408ci

    80-408ci New Member

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    If everything is tuned out smoothly than it should. I've seen high comp. cars with mild bolt ons run in the high 12's and your blown

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    1980 camaro Z28
    408 ci bigblock
    400 turbo Trans.
    T/A Honeycomb rims
    Air shocks
     

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