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Old 11-24-2008, 11:14 AM   #1 (permalink)
EJM
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Default What mods are done to racing ZX6R engine?

Last night I watched the documentary "Speed on Two Wheels." And one of the segments was the Kawasaki Racing Team taking a stock ZX6R and making it a race bike.

They didn'y really go into detail about the engine, but what exactly do they do to the engine to get the 20 extra HP they squeeze out of it. I'm just talking about the engine here, I know they upgraded the exhaust and suspension. They also stated that by converting the standard engine to a race engine they can only use it for one race because it won't last longer than that. So what exactly are they doing to get the extra HP and at the sametime making it only work for one race before it breaks.
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Old 11-24-2008, 11:21 AM   #2 (permalink)
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Originally Posted by EJM View Post
Last night I watched the documentary "Speed on Two Wheels." And one of the segments was the Kawasaki Racing Team taking a stock ZX6R and making it a race bike.

They didn'y really go into detail about the engine, but what exactly do they do to the engine to get the 20 extra HP they squeeze out of it. I'm just talking about the engine here, I know they upgraded the exhaust and suspension. They also stated that by converting the standard engine to a race engine they can only use it for one race because it won't last longer than that. So what exactly are they doing to get the extra HP and at the sametime making it only work for one race before it breaks.
I'm sure for starters they run race cams.
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Old 11-24-2008, 11:39 AM   #3 (permalink)
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increased compression and increased timing I'm thinking are important factors.

ECU has a lot to do with it. There's a lot of power hiding in EFI management. Also there's a lot of power hiding in headflow.

I'm not sure what exact class you're talking about so not sure on the restrictions.
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Old 11-24-2008, 12:13 PM   #4 (permalink)
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Make are the moving parts as light as they can! Also the motor build with depend on what class they are racing in. So you can do a superstock motor build or a full on fx motor!
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Old 11-24-2008, 12:22 PM   #5 (permalink)
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Raise compression, lighter pistons/crank/rotating assembly. Racing stator, racing cams, head work, exhaust, intake.
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Old 11-24-2008, 12:52 PM   #6 (permalink)
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damn. 20hp extra and it kills your engine. that sucks.
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Old 11-24-2008, 01:07 PM   #7 (permalink)
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damn. 20hp extra and it kills your engine. that sucks.
Well, with respect to race bikes and their engines, they're built to be ragged on heavily for a race weekend. They're not built to go tens of thousands of miles like our street engines. Remember it's not just the race. There's all the time spent in practice and qualifying too. With the way they are built and the use they see, things like engine tolerances, clearances, integrity of parts used, etc need to be checked/adjusted constantly for perfection. They don't expect those things to be OK from race to race. Gotta tear it down, check, replace/rebuild. Not to mention, sometimes bikes have to be torn down for no other reason other than to check for regulation compliance. Especially the bikes that win. Even if the bikes were more stock, at the professional level, the engine would still be checked frequently. Teams don't like to lose because a rod bearing is out of spec or there was a tired valve spring that went unnoticed.


That's not to say you can't have a powerful motor that will last a good while too because you can. But for us that don't have sponsors or deep pockets, we can't be building and tuning our engines on the ragged edge of performance all the time.

Hell, alot of AMA bikes from the previous season end up in the hands of track day enthusiasts and will be just fine for that purpose without needing to tear it down constantly. Track day abuse ain't nothin like a full professional race weekend.
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