| Author | Message | ||
     Pkforbes87 |
Has anyone tried it? I'm looking for some opinions on how they perform. I know these cams are stock on the XB bikes, but they are advertised as providing good low end torque as opposed to the .536 cams that are more suited for mid and high end HP. Right now I'm rebuilding a 2002 X1 with 1250 cyl's, 10.5:1 15* dome pistons, stock t-storm heads, and all-stock valvetrain. BUT I'm interested in Stage 2 light XB heads and .551 cams in the future. My thinking is that if the .551 cams offer increased low-end torque then I won't be running the engine in the upper rpm range, eliminating nearly any risk of valve float and no need for anything stiffer than the HD beehive springs included in stage 2 light headwork. Advice? Ideas? I'm just brainstorming here.. any input is welcome. | ||
| Texastechx1 |
the 551 xb cams (SE "E" cam to us tubers, because real XB can't fit, but I think you already knew that) isn't a bad cam... but I've seen dyno graphs comparing the two and the SE536 is just better, it has the same low end and mid range as the 551 but gets a whole lot better on the top end. but i will say that with either cam you will be happy, you have almost the exact same set up that i'm planning on, LOL. | ||
| Texastechx1 |
as a side note: you WILL need better springs with either of those cams, our X1s came with a good spring but max lift is .500"  here's what I'm planning on... stock cases and cylinders (bored .030 over) stock crank and rods forged 10.5:1 pistons (.030 over) Total Seal gapless rings Stock XB heads (fully cleaned and rebuilt with better valve seals and springs and some personal port smoothing by yours truly) Roller rocker arms (stock ratio) Jim's Hydro-solid roller lifters one piece pushrods SE536 cams stock X1 throttle body bored stock x1 headers with V&H pipe my personally designed air cleaner all tuned with ECMspy after brake in on the dyno I hoping this would give me 100+hp, but one can only hope. I think your set up would get the same numbers.  | ||
| Pkforbes87 |
Thanks for the tips. Glad to know I'm not the only one looking for some extra go while staying on a budget. | ||
| Texastechx1 |
Glad to know I'm not the only one looking for some extra go while staying on a budget. I thought that was the name of the game? LOL | ||
| Texastechx1 |
http://www.nrhsperformance.com/tech_ecamsvs536cams .shtml This is where I got my info on the 551 vs the 536. If you ask some of BadWeb's sponsers like Cycle Rama and Rev Perf they will tell you the same. | ||
| Outdoors |
I have also had a look at the SE .575 grind. NRHS has a dyno run comparison to the .536 and they loose nothing at low and mid rpm but have a bit more juice on top. They will work with the same upgraded springs needed for the .536 cams. | ||
| Pkforbes87 |
I saw the .575 / .536 comparison as well but the .575 requires cam cover and rocker box clearancing. Looks like the .536 will be on my "to do" list. I rarely go past 5000 rpm on the street anyway. |
