The CB1100 Community Forum

Good evening,
Spaceman I drove the bike 10.6 miles before checking temps 5.2 miles in city traffic light to light to and back from the interstate. 5.4 miles on the interstate 70 mph light
traffic temp 93 degrees humidity 82 percent. Upon my return I let the bike idle to stabilize for 2 min then checked the temperature with the B&D I did the same exact test with the stock can and the Two Brothers only diff was 120 mins between test as you know the exhaust is a simple 10 min install had to wait for the bike to cool down I wanted the motor to be the same for both runs or close to it. Also I use the
10w-30 Honda blessed GN oil and filter. Use 87 octane shell gasoline every thing-else on the bike is stock. Now because we both live in Florida you understand how hot the
pavement here is compared to other places. I don't know what effect that would have on this test or any at all. Perhaps we need to ship the B&D around to other members to use on this types of experiments and I wonder how much diff in the state of Washington running the same base specs will they have a gain or a loss?

Thanks hopes this helps.

(09-04-2014, 10:08 PM)The Spaceman_imp Wrote: [ -> ]Good reply Stealth, I'm glad you used a gauge to check the temp vs. "seat of the pants.". A 24 degree drop is good, was that with the bike stopped and idling?

I'm in FL too, (Ft. Lauderdale) and so far I haven't felt like the bike hhe approached overheating. I do shut the engine off if I'm out UN the heat of the day and I know I'm going to be sitting at a long traffic light.

The most significant temperature drop I ever got was on my Shovelhead HD. Switching from Dino oil to synthetic dropped 30-40 degrees as measured by my oil tank thermometer. With that big oil cooler and synthetic, I think my CB will be fine with either exhaust.

(09-02-2014, 11:03 AM)Stealth128_imp Wrote: [ -> ]Normally I would have to clean the pipes on my bike up from those nasty brown spots every couple hundred miles get out the Blue Magic Rub Rub Rub. But since I have installed the Two Brothers exhaust the pipes have remained pristine. I already know the bike runs a lot cooler. My question is that could the stock exhaust canister get that much hotter it was what was creating those dark spots on the header pipe. Also anybody that change the exhaust canister notice this also?

Thanks,
[attachment=1951]

Which exhaust and which model CB1100 do you have? I bought the M2 Black series and the box only mentioned 2013 but, it mounted and had the center stand blocker as well.

I'm just curious as I want to make sure this thing really is for my bike and not some hack job that could have my chain bouncing off my center stand.

Streetfighter - I have the M-2 on my 2014 standard. Fits perfectly. Same mount setup as the 2013.

As for heating, yes, the more restrictive OEM muffler will cause the exhaust casing to be hotter than with a less restrictive muffler.

If you're curious about the reason for this, here's the breakdown. If you're not, disregard.
Conservation of mass in fluid dynamics is actually conservation of mass flow rate, and that tells us that when you reduce the cross sectional area of a pipe the flow must speed up. Thermodynamically, a fluid (i.e. hot exhaust gases) has a greater convective heat transfer coefficient at higher velocity. Long story short, faster exhaust gas through a smaller tube will result in more heat transferred to the casing.