The iconic superbike : Yamaha YZF-R1
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Re: The iconic superbike : Yamaha YZF-R1
I got a run on an original R1 when they came out. Bonkers, but I preferred my RU Exup as it felt more solid and planted. Years later I rode a 2000 model back to back with an SRAD and preferred the SRAD as it felt like an RGV compared to the R1. Then I rode a GSXR1000 and it's still the most bonkers thing I've ever ridden on the road.
Iconic bike, the R1, but the 80s and 90s gave us an iconic bike practically every year.
Iconic bike, the R1, but the 80s and 90s gave us an iconic bike practically every year.
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Re: The iconic superbike : Yamaha YZF-R1
You can also close the exhaust valves sooner, which means less fresh charge chasing the burnt gases out the exhaust ports.Mr. Dazzle wrote: ↑Sun Jan 24, 2021 8:08 am More valves generally also means more valve area, which is one of the big reasons they do it. The valves are circular, so if you imagine fitting circular valves into a circular cylinder head you can 'cover' more of the bore with a greater number of smaller valves.
That in turn means you have less restriction on gas getting jn/out of the cylinders. One of the limitations on engine power is how quickly and easily you can get the fuel in and the exhaust out. More valve area means you can shove it in/out more quickly so you push the revs higher and the peak power up.
5v doesn't intrinsically make an engine peaky, bit it does facilitate tuning for high peak power at peak revs, which has the effect of making the engine revvy. Chicken and egg kinda thing.
That's why the FZ was so frugal. My 1990 version averaged 55 mpg, would hit 60 mpg without too much trouble and got close to 70 mpg on one Bank Holiday Monday run back across France when I couldn't find an open filling station for 200 miles. Nicest engine on anything I've owned.
My 92 WN GSX-R750 was more powerful (according to the spec sheet) and was far more peaky, but struggled to top 40 mpg. One German autobahn run got it down to just under 30 mpg.
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- Yorick
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Re: The iconic superbike : Yamaha YZF-R1
You must ride like a gurl. I used to get my GSXR1000 down to 17 mpgThe Spin Doctor wrote: ↑Wed Apr 21, 2021 12:21 pmYou can also close the exhaust valves sooner, which means less fresh charge chasing the burnt gases out the exhaust ports.Mr. Dazzle wrote: ↑Sun Jan 24, 2021 8:08 am More valves generally also means more valve area, which is one of the big reasons they do it. The valves are circular, so if you imagine fitting circular valves into a circular cylinder head you can 'cover' more of the bore with a greater number of smaller valves.
That in turn means you have less restriction on gas getting jn/out of the cylinders. One of the limitations on engine power is how quickly and easily you can get the fuel in and the exhaust out. More valve area means you can shove it in/out more quickly so you push the revs higher and the peak power up.
5v doesn't intrinsically make an engine peaky, bit it does facilitate tuning for high peak power at peak revs, which has the effect of making the engine revvy. Chicken and egg kinda thing.
That's why the FZ was so frugal. My 1990 version averaged 55 mpg, would hit 60 mpg without too much trouble and got close to 70 mpg on one Bank Holiday Monday run back across France when I couldn't find an open filling station for 200 miles. Nicest engine on anything I've owned.
My 92 WN GSX-R750 was more powerful (according to the spec sheet) and was far more peaky, but struggled to top 40 mpg. One German autobahn run got it down to just under 30 mpg.
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Re: The iconic superbike : Yamaha YZF-R1
Yeah, but you have bigger bores than me
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Re: The iconic superbike : Yamaha YZF-R1
Most of the Slingshot and WN on GSXRs had carbs that were far too big, same with the 1100.The Spin Doctor wrote: ↑Wed Apr 21, 2021 12:21 pmYou can also close the exhaust valves sooner, which means less fresh charge chasing the burnt gases out the exhaust ports.Mr. Dazzle wrote: ↑Sun Jan 24, 2021 8:08 am More valves generally also means more valve area, which is one of the big reasons they do it. The valves are circular, so if you imagine fitting circular valves into a circular cylinder head you can 'cover' more of the bore with a greater number of smaller valves.
That in turn means you have less restriction on gas getting jn/out of the cylinders. One of the limitations on engine power is how quickly and easily you can get the fuel in and the exhaust out. More valve area means you can shove it in/out more quickly so you push the revs higher and the peak power up.
5v doesn't intrinsically make an engine peaky, bit it does facilitate tuning for high peak power at peak revs, which has the effect of making the engine revvy. Chicken and egg kinda thing.
That's why the FZ was so frugal. My 1990 version averaged 55 mpg, would hit 60 mpg without too much trouble and got close to 70 mpg on one Bank Holiday Monday run back across France when I couldn't find an open filling station for 200 miles. Nicest engine on anything I've owned.
My 92 WN GSX-R750 was more powerful (according to the spec sheet) and was far more peaky, but struggled to top 40 mpg. One German autobahn run got it down to just under 30 mpg.
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Re: The iconic superbike : Yamaha YZF-R1
Nah, you ride like a gurl, I've never got 50mpg out of an FZ, and my early R1 used to do about 20mpg, I ride like a twat.
Honda Owner
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Re: The iconic superbike : Yamaha YZF-R1
Looks like I'm outvoted. I'll get the wigLe_Fromage_Grande wrote: ↑Thu Apr 22, 2021 7:46 amNah, you ride like a gurl, I've never got 50mpg out of an FZ, and my early R1 used to do about 20mpg, I ride like a twat.
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Re: The iconic superbike : Yamaha YZF-R1
Seems an appropriate opportunity for a bit of picture-whoring to me
I bought mine brand new in 1999 , was the bike I did my first ever trackday on back in the days when I used to ride to them, it gave me 15k trouble free miles of real fun before I sold it
I bought mine brand new in 1999 , was the bike I did my first ever trackday on back in the days when I used to ride to them, it gave me 15k trouble free miles of real fun before I sold it
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Re: The iconic superbike : Yamaha YZF-R1
That's probably correct, it's led to people running huge flat slides on mildly tuned big Zs and then complaining about throttle response
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Re: The iconic superbike : Yamaha YZF-R1
It's the superbike whose name springs to mind first. Possibly because "R1" is a lot quicker to say than "GSXR1000" for example.
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