296° Enduro-torque camshaft

Discussion in 'Airheads' started by bernardofeio, Jun 7, 2012.

  1. adventure950

    adventure950 Anglo-Saxon

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    Mr Gregor I think you have it spot on with what MK66 says - (I read his stuff on the other forum) The 296 feels very torquey, smooth power delivery and so on and i think your right some other set ups will give more torque - but its not a bad starting point and its certainly a very rideable engine configuration - with this cam in. Cheers Jake.
    #61
  2. RGregor

    RGregor Been here awhile

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    Hi Jake,

    I just reported what others have experienced. No personal experience with that cam.

    Best regards, Rudi
    #62
  3. RGregor

    RGregor Been here awhile

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    Two additional questions: what configuration do you have regarding exhaust (header pipes and mufflers) and air box?
    #63
  4. supershaft

    supershaft because I can

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    Fed up and annoyed? We have finally come real close to the same conclusion. Let's leave it at that. The rest of us are discussing cams.
    #64
  5. supershaft

    supershaft because I can

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    If this thread and the other current cam thread could ever have anything close to a conclusion I guess it would be that we are left to researching individual opinions about cams that hopefully they have actually run and compared. It's a real shame that many of the cams for our airheads do not have specs with check points so we could compare specs. Pretty much everyone realizes that comparing specs is as much art as science but perhaps not as much as comparing a bunch of he said/she said. Since the he said/she said is all we have, I hope the stories about other cams are a lot closer to the truth than that what I have found to be true about the 336 compared to most the stories about them out there. Going simply by reported performance, my 336 experience tells me to buy the cam with the worst reputation. There's a small crowd here that is real happy doing just that! :D
    #65
  6. adventure950

    adventure950 Anglo-Saxon

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    Means very little to me but maybe you tech guys can use this cam timing readout[​IMG] graph
    #66
  7. Padmei

    Padmei enamoured

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    The dark blue is more natural. The red is a bit OTT if you ask me, a bit too much pornstar but if you feel you really do need enhancement just go with the lite blue.

    Can we see side view too please?
    #67
  8. adventure950

    adventure950 Anglo-Saxon

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    Padmei - you really need to be getting out you know . :1drink
    #68
  9. Beemerboff

    Beemerboff Long timer

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    Nice curves, but just one point, can anyone see a lift point where all the durations match the claimed figures.

    And if they can, shouldnt that give us the checking clearance?
    #69
  10. supershaft

    supershaft because I can

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    The degree graph isn't near big enough to tell anything I don't think. You have six OR seven dashes representing 30 degrees. Ballpark figures again?
    #70
  11. Ras Thurlo

    Ras Thurlo Desert Lion

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    bump


    I also like to ride my airheads at the bottom end of the power band, keeping the bike at +/- 2k revs and rarely venturing beyond 5.5k. I have so far been looking at this topic through the view of shorter gear ratios rather than cam change.

    has anyone out there done a 296 cam change and left everything else stock? All thread commentary have been on bikes with 1000cc conversions and flowed heads, which means its hard to validate this estimate
    #71
  12. Prutser

    Prutser Long timer

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    I had one in an R100R. The rest of the bike was stock. Compared to a stock 91' R100 mono it could climb steep hills at idle. when you had to raise the rpm a little with the stock R100 mono to do the same thing. That was impressive sometimes. For the rest it was a bad choice for my preference. The usable rev range was way to short(again the short power band).
    In the higher rev ranges there is nobody home with that cam when the rest of the engine is stock.
    It can be improved with spending more money.

    For me personally not the best cam because I love the long power-band.
    #72
  13. Ras Thurlo

    Ras Thurlo Desert Lion

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    So is the answer to use the 296 cam only in conjunction with a more hot-rod engine?

    Prutsers comment was with a cam-only change at high revs there is no-one home, while all the other post (inc piston upgrades etc) seem to suggest great pulling power until approx 6k revs and then a gradual tail-off rather than a cliff-fall.

    #73
  14. RGregor

    RGregor Been here awhile

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    Hello,

    unless you like pinging you should not run this cam in combination with high compression.

    Best regards,

    RG
    #74
  15. DiabloADV

    DiabloADV Semi-Occasional

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    What about with stock compression? I've got a Seibenrock 1000 kit that will go on my R90 motor, but I plan to use a thicker shim to keep compression a little lower. I don't want to dual-plug the thing.

    I don't like riding at high revs, so I was thinking this cam might be interesting...
    #75
  16. AliBaba

    AliBaba Been here awhile

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    I have used the 296 camshaft and the Siebenrock upgrade-kit without pinging.
    #76
  17. RGregor

    RGregor Been here awhile

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    Hello,

    the SR kits give a CR of ~9.2:1.
    That seems to be OK for that cam.
    I do know people using that cam with a CR of 10:1 or higher and they have severe pinging.

    In general the duration has to match the CR and thus you can't go that high here.

    Best regards,
    RG
    #77
  18. beemerphile

    beemerphile Long timer

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    RG, with what grade of gasoline are these results observed? Also, single or dual plug?
    #78
  19. Ras Thurlo

    Ras Thurlo Desert Lion

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    are you using the S7rock upgrade for the 80 (ie 80 carbs and heads?) or the 100 (for 100 carbs/heads)?

    my understanding from the history of the thread was that with your Seibenrock kit + 296 was that you gained torque until just sub 6k revs then torque curve drops gradually rather than off a cliff - is this right?


    My current take on this cam is that you obviously gain torque at low to mid (stoked), so the principal issue is to figure out when/how much are you compromising at the upper end of the torque curve

    Prutser made comments about the lack of guts in high revs on stock pistons, as compared to different feedback from the Seibenrock boys. Which makes it sound like you may need lighter, higher compression pistons than OEM to give you that bit more uptop to counteract the torque curve cliff-fall

    If this is right then its good to know roughly where the curt-off is on compression for piston choice.


    - feel free to comment as I getting out of my depth rapidly...
    #79
  20. AliBaba

    AliBaba Been here awhile

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    R80 heads (ported) and R80 carbs.


    Compared to a R80 I gained torque all the way. My estimate is that if you compare it with another engine with the 7rock upgrade kit I gained torque up to 6000 RPM.
    #80