How is this possible in a stock TC96 with more duration and a much-later intake close spec? That would violate the laws of physics.

 

+1 on waiting for the winter and do it all at once. I wish I had your money. Good luck.

 

You had better do your homework first unless you like having a bunch of
parts left over to try to sell on e-bay.
If you put 255 cams in now, and you wind up with 10.5:1 compression
this winter you will need other cams because 255 cams do not like high
compression. Ask your question in the "engine/fuel /intake/exhaust" section
of this forum and start your homework there good luck

 

I assumed from his posts that he wants to put the 255's in with the stock motor, run them this summer, then pull them out in favor of something else next winter. I agree the 255's won't work with more than about 9.5:1 CR. That 25° intake close just develops too much CCP.

 

You have any experience with these other cams? I have ridden the 255 in a 103. I know what I am talking about.....

I have 100 tq on my grip at 2700 RPM. That is cruise range. There are better overall cams then the 255. I simply listed them. The 255 decent lift, stock duration smog cam. You have a dyno on yours at this RPM? I would like you to prove your right about what your putting out there for consumption.

 

Google American Rider magazine, and then read the tech articles, specifically the one by Joe Minton about torque and how to to get some.

Mild cam changes give you exactly what you want.

 

I've ridden bikes with these other cams, but prior to the 255's in my current '07 SG have never installed anything other than Andrews cams in any of my previous bikes. If you like them better, that's all well and good--but your chart isn't showing anything below 2700. Some of us live below 2700 and want the power at 2200, 2500, or thereabouts without downshifting. I will bet you a cold one that the 255's generate better TQ below 2700 rpms than any other cam set in a stock motor (i.e. stock CR).

I've also seen testimonials from users who've also ridden with the 255's and others (like the Wood TW6-6), and many of them say the peakier cam set produces more TQ and HP than the 255's but not where they ride. That's the point I'm trying to make. If you ride above 2700 most of the time you may be better off with something else, but if you're a typical FLH rider you may be below that most of the time, and if you want the power now rather than after a downshift or two, you want a cam that produces the TQ as low as possible.

Also, the 255's do not have "stock duration," and by "stock" I mean for the TC96. Go look at the specs. The duration numbers aren't extreme by any measure, but they're longer than stock.

It's all in what you want out of the grind, and IMO neither of us is wrong in what we want out of a cam set. I think we're comparing apples and oranges. Your chart shows steady increase in HP 'til 5500 while the 255's will start their descent at 5000. It's a trade-off--the peak HP values for the 211's, 203's, etc. for the low-end grunt the 255's produce. Remember, I'm talking about an otherwise stock TC96 with stock CR. What other mods have you made to your engine?

 

+1 hold off and do it all at once

 

Here is Stock FI 96 Cam
Intake Open -0.2
Intake Close 38
Exhaust Open 41
Exhaust Close -02
Intake Duration 217
Exhaust Duration 220
Overlap 02
Intake Lobe Center 112
Exhaust Lobe Center 111
Lobe Sep Angle 111.5
Intake Lift 474
Exhaust Lift 474
Intake Lift 0.087
TDC Exhaust Lift TDC 0.110


SE 255
Open 0.6
Intake Close 25
Exhaust Open 48
Exhaust Close 07
Intake Duration 211 (Shorter)
Exhaust Duration 235 (Longer)
Overlap 13
Intake Lobe Center 100
Exhaust Lobe Center 111 (SAME)
Lobe Sep Angle 105
Intake Lift 550
Exhaust Lift 550
TDC Intake Lift TDC 0.079
TDC Exhaust Lift TDC 0.070

My point is these cams have little few minuet tweak differences, the 255 actually has less intake Duration then the stock cam. I suppose they are leveraging the large lift because fill time is short. But that cannot be leveraged without a head that will support it.... (Ported) The 255 will infact increase static compression, and will be very cranky on poor fuel.

Anything under 2500 RPM frankly is lugging a Twin Cam. Why would anyone want to focus a bunch more torque under this range is confusing to me. If anyone is demanding power down at this level they are just asking for a scissored Crank and detonation will certainly first rear its head at low RPM when demand is asked for. That pounds out crank bearings. If you want max torque letting the clutch out, well the 255 is certainly for you.

Before I forget my engine is stock other then the things I already mentioned. No head work, no compression increase. It been dynoed 3 times, all with simular power results as listed. I have had different mufflers and air cleaners on the bike. That the reason for multible pulls I have had done.

There have been several people that have used the 211 on my advise and stated results. Roughly 5 on this site that have PMed me back. They have gotten simalar power results as I have, and thanked me. Why? Because they did not have to go 100 cc more on a 103 for $2K more to the dealer just to get at and near 100/100 out of their existing 96 and have nice wide power band 2500 on out.

Look I am not trying to argue you, I am happy your happy with 255s. My point is that you can make nice numbers with a 96 and get fantastic wider performance with what I believe are better choices then the 255. It would be the last cam I would put in a 96 or a 103. But thats me, and my opinion. But that is why there are so many cam choices out there.

I know what the 255 cam is, and is not. I think if you rode a 96/211 bike you would be sold. The manners, sound, are very most excellent! When I wear out my 96 top and go 103 I would be choosing the 253 cam.