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Buell Forum » 1125R Superbike Board » 1125R Questions & Answers » Archive through October 03, 2007 » Hot air from radiators & rear shock « Previous Next »

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Vagelis46
Posted on Thursday, July 26, 2007 - 12:59 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Simple question :

Is the hot air from the radiators, directed on the rear shock?

Or is there some kind of a duct, so that the hot air stream is not hitting the rear shock?

On the XB the rear shock is running hot, when the cooling fan is on, which is not a good thing. I actually hate that.

Is the rear shock of the 1125R running cool? Is the rear exhaust pipe running close to the shock, like the R1, 1098, etc?
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Paintballtommy
Posted on Thursday, July 26, 2007 - 01:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

the rear shock is offset to the side to improve air flow through the chassis. this i would assume along with the piggyback reservoir helps keep the shock cooler.
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Skully
Posted on Thursday, July 26, 2007 - 01:46 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

On the XB the rear shock is running hot, when the cooling fan is on, which is not a good thing. I actually hate that.

Just curious: is there any particular reason that you dislike it? Have you been able to measure a performance degradation?

I race my mostly XB9S in the CMRA and though I am an amateur, I've not noticed any performance issues racing here in the Texas summer heat.

Keith
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Firebolt1203
Posted on Sunday, July 29, 2007 - 10:24 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Moving a viscous fluid through an orifice creates friction and creates heat, so the shock is going to heat up regardless. The engine will probably be thermostatically controlled to 180-210 degrees, but when you're traveling 60 mph the time for heat exchange between the ambient air and the radiators is so short that I'm sure air temperature around the shock wont be but a few degrees over ambient, or maybe even less.

As a side note any viscous fluid has an operating temperature range, just like motor oil. I notice that on cooler days my bike doesn't handle well until everything warms up; tires, suspension, and engine.
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