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Thread: wider lobe separation = less performance???

  1. #1
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    wider lobe separation = less performance???

    what does the lobe separation modifies?? for example 224/224, .566"/.566" with 112 vs 115 lobe separation, will they perform the same? just the diff in the idle??? or what do they change?
    thanks
    06' Silverado RCSB 5.3L 4wd..
    PERFORMANCE: Cam, Springs, Pushrods, P&P heads & 3 angle valve job, Injectors, PS LT's & ORY, Nelson Tune, Catback, CAI, Comp Cam Double Timing Chain, HP Oil Pump, UD Pullies, ARP bolts, Stall, TBS, 4.10's, Iridium NGK's, G-80, 160 t-stat, HD-2 & Vette Servo, 46,000 tranny cooler, 75-125hp shot of funny Gas..
    HID's Hi, Lows & Fogs
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  2. #2
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    There are several things that come into play here. Yes a wider LSA reduces maximum tourque and natural EGR, but it widens the power band and helps with idle. The main reason most go with a tighter LSA is to increase Cylinder pressure, which we all know means more work per stroke. Specifically more force in the W=FXD, The thing is with increased cylinder pressure comes more fuel to avoid knock, less ignition advance or both.

    You will find all you neeed to know here:
    Technical Specs & Information
    Last edited by -HIC-; 11-09-2008 at 09:06 AM.

  3. #3
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    Thank you sir! Great info!! btw, are you happy with your cam? why you didnt go any bigger than that?
    06' Silverado RCSB 5.3L 4wd..
    PERFORMANCE: Cam, Springs, Pushrods, P&P heads & 3 angle valve job, Injectors, PS LT's & ORY, Nelson Tune, Catback, CAI, Comp Cam Double Timing Chain, HP Oil Pump, UD Pullies, ARP bolts, Stall, TBS, 4.10's, Iridium NGK's, G-80, 160 t-stat, HD-2 & Vette Servo, 46,000 tranny cooler, 75-125hp shot of funny Gas..
    HID's Hi, Lows & Fogs
    Waiting to be installed: LC-1 WB & Standalone system

  4. #4
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    The lower the LSA number....the more of a stall you will need--potentially. the power will weaken down low, but it will peak higher, as explained by Quik. The lower the LSA number, the more of a lope you will get at idle.

    2000 ECSB 6.0L
    TORQUER V2 CAM ● COMP 918's ● 7.4 HARDENED PUSHRODS ● K&N SERIES 77 CAI ● 80mm BBK ●PACESETTER LT HEADERS AND 3'' ORY ● SUPER 40 FLOW ● 3000 STALL ● 4.10s ● BUILT 80e ● VORTEC PERFORMANCE TUNE ● MSD 8.5mm PLUG WIRES● ELEC. CUTOUT ● UD & ALT PULLEYS ● FLEX-A-LITE E-FANS ● 22" CENTERLINE STINGRAY III's ● LUND FIBERGLASS TONNEAU ● 2" LEVELING SHACKLES ● 12K HID LOWS & FOGS ● LEDs ● DEBADGED ● WHITE-FACED ESCALADE GAUGES ● KICKER 450.1 ● 2-CVR 10's ● DS60's ● K693's

  5. #5
    ff_jeff Guest
    Quote Originally Posted by txarkitekt View Post
    The lower the LSA number....the more of a stall you will need--potentially. the power will weaken down low, but it will peak higher, as explained by Quik. The lower the LSA number, the more of a lope you will get at idle.
    werd. I have a 110 lsa, and the power doesnt come in untill 3000rpms. Really fill it at 4k-6200rpms.

  6. #6
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    No wonder Jeff has an SD tune....LOL

    110...!

  7. #7
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    Quote Originally Posted by ff_jeff View Post
    werd. I have a 110 lsa, and the power doesnt come in untill 3000rpms. Really fill it at 4k-6200rpms.
    Jeff Im the same way on mine I wont feel anything until around 3k rpms.

    I need a stall bad Im still debating on what to get
    2012 F-250 XLT/FX4 RCLB 6.7 Powerstroke
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  8. #8
    ff_jeff Guest
    Quote Originally Posted by Aggie View Post
    Jeff Im the same way on mine I wont feel anything until around 3k rpms.

    I need a stall bad Im still debating on what to get
    Everyone says anything over a 3000rpm stall, and towing is out of the question. Im going to get a 3000rpm.

  9. #9
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    Quote Originally Posted by ff_jeff View Post
    Everyone says anything over a 3000rpm stall, and towing is out of the question. Im going to get a 3000rpm.

    The perfect stall for both of you is CircleD's Reworked TrailBlazer converter. The one I had stalled out right at 3k and you will still be able to tow. Other companies may offer something that will work as well, but not for the price. If you both get one at the same time Chris may cut you a deal. Otherwise they are 350 and well worth it.
    Bryan

  10. #10
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    Quote Originally Posted by Felix Arrizon View Post
    Thank you sir! Great info!! btw, are you happy with your cam? why you didnt go any bigger than that?

    A cam is like a woman you have to try a few out before you find what you like!

    I went with this cam thinking it would be about right for my setup. Now as I have pulled so much weight out of my truck and gone up to the 3600 converter I am looking at something around 228 ish duration 580-600 lift on a 112 or 110 lsa. So my cam will be on the market soon enough. I just have not decided on the exact cam I want to run. I want to buy something big enough for my next engine, but will still run wild in my current little 5.3. I have been traveling so much lately I have not had time to think about the cam lately, but as soon as I am back from NH I will start my research!

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