View Poll Results: Which Camshaft design do you prefer?

Voters
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  • Symetric - Intake & Exhaust Duration/Lift the same

    1 10.00%
  • Split Duration - Less Intake Duration/Lift than Exhaust

    6 60.00%
  • Reverse Split - More Intake Duration/Lift than Exhaust

    3 30.00%
  • Don't Know - I'm reading this thread to learn something

    0 0%
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Cam Timing - what do you prefer?

This is a discussion on Cam Timing - what do you prefer? within the Internal Engine forums, part of the LSx Technical Help Section category; There are a lot of ways to go here. I'm looking over cams in the 224*-236* range where it seems ...

  1. #1
    Tech Junkie hammertime's Avatar
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    Pewter Metallic
    2001 Camaro SS

    Cam Timing - what do you prefer?

    There are a lot of ways to go here. I'm looking over cams in the 224*-236* range where it seems most of us fall. I've been collecting pros and cons of each design, but I wanted to see if anyone cared to vote with their preferences, share their opinions, etc.

    So with that said, which do you perfer?

    Thanks in advance for any & all contributions!
    Hammer - hammertime.us
    2001 Light Pewter Metallic Camaro SS, 6 speed
    K&N, SLP Lid, SLP y-pipe, GMMG cat-back, Lou's Short Stick - more to come!

  2. #2
    Slow'er'Ass Mr. Luos's Avatar
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    Red Tint Jewelcoat
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    I have had good luck with split duration cams.
    Newest is a 248/254 629/622 113.
    2008 Trailblazer SS
    Yank PTB3600, Kooks 1 7/8" LT's, 4" intake, E-fans, Magnaflow, Sonnax kit, tranny cooler, tune.
    Lowered, HID's, tinted.

    1999 Pontiac Trans Am WS.6 #1747 SOLD
    531.1 RWHP 481.3 FT/Pounds all motor.

  3. #3
    Grand Imperial Wizard Sarge's Avatar
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    Retired Outlaw Sum Bitch

    Yup^^^^ I'm with him...well not really....I aint talking Brokeback Mountain here now....I agree with Mr. Luos....hows that....

  4. #4
    member since may 2000 nhraformula's Avatar
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    black
    2000 nhra edition formula

    224/224 owner here
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
    11.96 @113.25

  5. #5
    Tech Junkie hammertime's Avatar
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    Pewter Metallic
    2001 Camaro SS

    Well, you guys are talking about a lot more cam, but I know you are both running more cubic inches as well. Any particular reason you chose a split over the others?

  6. #6
    Slow'er'Ass Mr. Luos's Avatar
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    Big cubes...bigger cam. The more air you are moving the less 'big' the cam feels. You have to feed those cylinders somehow...you almost need a bigger cam to allow them to fill up.
    My old Lunati grind actually had a higher duration to cubes ratio.
    254/402 = .631
    234/346 = .676
    (At least I think that is how it works. Basicly the new cam should act roughly the same in the 402 as the Lunati acted in the 346.)
    I can't really answer your question though. I honestly don't know exactly why the splits work well. I know how a cam works and what it does, but I can't explain why any one type of grind is better than the other.

    I have only used split duration cams to date and have always made good power with them.
    My old Lunati grind was a 226/234 554/575 112 that gained me 41 RWHP on the stock tune. Would have been great for S/C, or even nitrous. Did fine N/A though as well.


    This post may appear jumbled. Blame Jack Daniels.

  7. #7
    Tech Junkie hammertime's Avatar
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    Quote Originally Posted by Mr. Luos
    This post may appear jumbled. Blame Jack Daniels.
    dammit! I just typed a novel and then I lost it trying to do a spell check!

    What you said makes perfect sense. More cubes need more duration to fill the cylinder adequately. A radical cam in a 346 is much milder in one of your 402's.

    My experience in the past has been with SBC engines, straight up grinds like comp's high energy hydraulic. Seems that most companies who grind cams for TPI, 5.0 EFI and LT1 engines are splits. Probably with good reason, as the OEM's tend toward that as well.

    Just wondering if there is another school of thought out there that bears discussion.

  8. #8
    ls1tech director
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    laser red
    1994 Mustang GT

    depends on the application. the cams job is to open and close the valves at the right time to best fill and empty the cylinder. and your only looking at one point of a cams total lobe profile.

    heres and FM13 for example

    .050" 230\232
    .200" 151\150
    .006" 280\284

    my own custom cam also is split and reverse depending on what duratiion point your looking at. i had mine doctored so i know .006 too .300

    a

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