Dyna BB 103 S&S cam selection dilemma

  • quick s bob
    quick s bob
    10 years ago

    Just wondering your thoughts are on using an S&S HP103 cam in my 2010 dyna Street bob. Currently it is a Big bore 103ci with SE CNC ported MVA heads and a SE260 cam but I want to change the cam to achieve max HP in the high rpm range but I reckon the SE 260 doesnt have enough bottom end power and that there must be something more suited. My mechanic reckons the S&S 103HP cam would be a good fit although from what I have heard they are for a stock 103 were as mine has the MVA heads, 10.5 HC SE pistons, 58mm Throttle body, pro comp V&H 2 into 1 pipes, SE roller rockers + lifters etc etc. I would have thought that the HP103 cam doesnt have enough lift (.575";) to get the best out of the MVA Heads. Just wondering what the experts out there think about using this cam and if its no good what would they recommend.

  • quick s bob
    quick s bob
    10 years ago
    I forgot to mention I think the S&S 635HO would be more suited for my combo
  • daddyracer56
    daddyracer56
    10 years ago

    do you have domed slug's 103 would need high comp for 260's 

  • quick s bob
    quick s bob
    10 years ago
    Yep got domed high compression SE 10.5:1 pistons
  • speedzter
    speedzter
    10 years ago
    Are you sure you have CNC MVA heads on a 103 ?
    Who designed the current build ?
    Without more info, It all sounds very wrong.
  • quick s bob
    quick s bob
    10 years ago
    Have no idea who designed it but Im 99% sure they are the MVA heads. Think its the 2010 103ci Stage IV race kit they used to offer it with CNC MVA heads and a SE 260 cam but changed it in 2011 or something like that. Thats what I was told but who knows
  • carbon fibre
    carbon fibre
    10 years ago
    I got a set of Woods 9F's that would spin the top end. LOL. for sale too.
  • quick s bob
    quick s bob
    10 years ago
    Will need more inches for the 9F carbon fibre haha. What do you reckon a Woods TW 400-6 would be like in my setup. Yoiu know ya stuff so surely you can point me in the right direction so I don't waste my money
  • quick s bob
    quick s bob
    10 years ago
    Hilly I will test the compression tomorrow morning. How do I work out the compression ratio once I have a PSI reading from the compression test?
  • daddyracer56
    daddyracer56
    10 years ago

    use to drag race a late model 09  Dyna with the 103 stage 4 kit 260 cams  with S/E  heads do not know what type of S/E/heads  , 50 m.m. throttle body , i modified the stock exh pipe's & mufflers  had about 106hp i think back then , race her for Fraser/s Sydney  about 1 1/2 seasons  was a great bikle best time on the strip was 11.007 sec's @  120 /2 mph if i remember right  i rode her home a few time's from the track & back to the shop , i think she was a great bike good allround power esp for the street ,  maybe your comp ratio is not set up proper as this was one of the better set up's good low down & mid range power & torque but i am only a feather weight @ 61 klg's the 260's is one of my favorate cams  olso for the same shop ran a 113 stage 4 kitted 2010 Dyna with the 260 cam's  that bike was even better power & torque i ran her for a full season she went straight into 10.6 sec E.T.'s @ 125 mph beaut bike great street bike  look out for your licence & point's ?