Oil cooled?

[AK191]

Would a BMW R850R be concidered "air" or "liquid" cooled? I'm sure this has been answered LOOOOONG time ago with early GSXR, but I gotta ask. Even a R1100 @90-100 HP and 500# is no threat to most of the twins on the track, so I wonder what classes they would fit into.

[PJ]

Lightweight Supersport, Superbike (plus GT Lights) and Grand Prix allow air-cooled twins up to 1210cc.

BMW boxers are considered air-cooled. Check recent results and you'll see how well Nate Kern goes on his R1100S.

[AK191]

Thanx!

[edgeracng]

so then what is an 86 gsxr 1100 legal for????

[Super Dave]

I believe that the non-liquid cooled bikes with four valves per cylinder are allowed in heavyweight classes.  HWSS, HWSB, GTO, and also ULSB, ULSS, and ULGP.

[251am]

 Air cooled is the classification for R bikes. I started out on my R11GS a few years ago. I'd recommend changing gearbox and rear end to Amsoil 75-140. They're gonna get hot!!   

[Eric Kelcher]

Liquid cooling refers to the primary method of cooling, whatever that liquid may be.

FYI SACS is a form of liquid cooling

[Mongo]

Interesting.  Most people I've talked to have always considered oil coolers to still be air cooled.

[Super Dave]

Liquid cooling refers to the primary method of cooling, whatever that liquid may be.

FYI SACS is a form of liquid cooling

True, but even thunderbike allows certain SACS bikes up to 800cc+...

What's the official take on a 1986 GSXR1000 with SACS?  What class?

From heavyweight..."other configurations are allowed unlimited displacement"...

[edgeracng]

uh yeah, what would my old tank gsxr 1100 be legal for???

[Super Dave]

Eric knows more...

Worst case, Unlimted Supersport, Unlimited Grand Prix, Unlimited Superbike, and GTO.  Supersport would have some limitations for modifications.