Anyone like V8's

[Robson]

Anyone like V8's...............and no were not talking cars here

goto www.22000rpm.com and check out the monsters in theyre made by drysdale and theres a sound clip of a 750 V8 what a sound youve gota check it out

https://home.mira.net/~iwd/av/drysdale750v8.mp3
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Cheers

Paul (Robson)

[Milo]

Yeah, i've seen them in MCN before, it must sound good. but my work comp doesn't have speakers

[Robson]

unlucky mate its sounds absolutly awsome they only rev iot out to 13,000rpm but damn it doesnt half sound good
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Cheers

Paul (Robson)

[Kickstart]

Hi

There was one for sale at the Stafford classic bike show a few years back. Built using a pair of fzr400 top ends I think. Exhaust routing from the rear cylinder looked to be a pig. Not sure who built it

Check out this one:-

https://www.italia.co.uk/morbidelli/

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[craigT19]

hmmmm V8 bikes are yet to make a big imprssion on me....granted they sound nice...but to me they just look "clumsey" im not shur if they would handle very well???
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Bikes owned :- 2001 nsr125, 1999 zx6r, 2006 yzf-r1, 2009 xmax 250, 2012 yzf-r1, 2015 MT-07
Current bike : - 2016 MT-10
BCF member pops. sadly missed 1945-2003

[Doddmaster]

I doubt anyone would use an engine that size in a sports bike. Would be fine for cruisers, and big tourers. In my opinion it is more for posing than powering the latest supersports bikes

[G]

No reason they can't use one in something like a GP bike, it's not gonna be significantly deeper than a parrelel 4 or wider than the RCV v5.

[Robson]

These bikes are supposedly going to be entered into motogp if they get enoyugh funding i can assure you they are no cruisers the engines will only be 30mm wider than a NSR500 gp bike make sh*loads more power and scream out to 22,000rpm what more do you want i'd have one of these over any NSR500 or the new V5's, here are the specs in comparison to the NSR500 GP bike

Drysdale 990-V8 NSR 500
990cc V8 - 4 stroke 500cc V4 - 2 stroke
Cylinders 8 4
Redline 20,600rpm 14,000rpm
Power 165kW (220hp) 140kW (185hp)
Mass (no fuel) 155kg 135kg
Race Weight 175kg 162kg
Power to Weight Ratio 0.942 0.864
Fuel 24 litres 32 litres
Engine width 330mm ~ 300mm
Engine mass 52kg 45kg
Top Speed 360kph 340kph

1. Better power to weight - With a full fuel load at the beginning of the race the Drysdale 990-V8 will be only 13 kg heavier than the benchmark NSR 500 Honda. With a superior power to weight ratio and little more in frontal area - the 990-V8 will be faster in a straight line and should give away very little in the corners.

2. Better turn-in- The single heaviest component in any modern race motor is the crankshaft - the 990ccV8 crankshaft will weigh only 4.3 kg - significantly less than the complex pressed-up roller-bearing item used in the Honda NSR 500. This represents a major reduction in the rotating mass which reduces gyroscopic forces and allows the whole motorcycle to be much easier to tip into a corner or turn generally.

3. More Power- The engine revs and power stated above are quite conservative - with ongoing development it is not unreasonable to expect 22,000 rpm and 180kW (240 hp) from a short stroke 990cc V8.

https://www.22000rpm.com/images/introimage550.jpg
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Cheers

Paul (Robson)

[Milo]

think about this one...
2 pipes down each side and 4 under the seat

[Robson]

also i should add that the sound file is only of the 750 V8 and they only let it rev out to 13,000rpm these things are fit for the best part of 20,000rpm i'd love to hear the wail off one of these at full lick
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Cheers

Paul (Robson)

[Keith]

[Milo]

that'd be quite funny, but it'd have to be geared to about 400mph for anyone to be able to hold on!

[Robby]

the RCV is too powerful for modern rubber as it is now.. imagine those tearing through tyres..

fuckit, just weld some big spikes onto the wheels.

[G]

I think they're not tuning any of teh motogp bikes much past 220hp, because they can't do anything with it.
Anyone got a couple of NSR engines lying around?.. we could weld them together and wee what happens

[Robson]

yeh i know what your saying theyres only so much usefull power you can put on the rubber before it becomes unusable.....i just wanna hear these babys scream past 21,000rpm
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Cheers

Paul (Robson)

[G]

There's also only so much accelration a certain wheel base can have without the front lifting. Increase the wheelbase and steering suffers

[Robson]

yeh seems to be a bit of a lose lose situation with that much power although im sure you could get the last bit down once your already at 160mph couldnt see i wheeling then.....although maybe it would 240hp alot of hp for a car let alone a bike.........thats neck snapping power...probably litterally
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Cheers

Paul (Robson)

[Robby]

whos up for front swingarms and rear wheel steering? get the power through the front and you can keep chucking it in.

[Robson]

ahaha that would be class no more power wheelies just power endos instead ahah that would be mental..........off topic that same company made a 2 wheel drive bike crazzee yes i know but they did check out heyre website for info on it
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Cheers

Paul (Robson)

[G]

Yamaha (among others) did make some prototypes for 2 wheel drive I believe. Their system used some sort of hydraulic (style) fluid which gave approximatley 20% of the power to teh front wheel.
I wonder if you could stick a direct (chain) drive on a hub centre steering bike? hmmmm....

[Robby]

belt drive allows more flexibility, or a drive shaft running off a sprocket. it would slow down steering though, to allow the drive shaft to effectively move back against the sprockets motion.

i'd like to draw you a picture. but this is a computer.

[Keith]

Hi

Think the fluid drive would be the only practical solution. Chains have been tried.

A 2wd bike would be OK, but not sure what effect it would have when you wheelied it. Also not sure where you would fit the centre diff. God help you if you tried building a 2wd bike with both wheels geared to turn at the same speed. It would never go round corners, that is for sure

The viscous coupling in my 4wd car gets confused enough as it is with low speed manoevres when the front wheels need to travel further than the rear wheels (it starts to lock up to push more power the the rear as it thinks the fronts are starting to spin)

All the best

Keith

[Robby]

does a viscous coupling just push some hydraulic fluid around a circuit then?

[Kickstart]

Hi

No, a viscous coupling allows some torque to be transmitted. Basically you have one shaft in and one out, but the 2 are not directly connected. Each shaft is connected to a load of disks, with the disk alternating. In the unit there is a fluid which gets more viscous as it warms up. When both the input and output shafts are turning at the same speed (so when it is in the drive to the rear wheels, both the front wheels and the rear wheels are turning at the same speed) all the disks are turning at the same speed, and very little heat is generated. As the front wheels start to slip, the input shaft starts to turn more quickly than the output shaft, so the speed of the disks varies and the fluid is warmed up. As it warms up it thickens, and starts to bind the disks together, transferring more torque to the output shaft (and so the rear wheels)

They are used where you need to allow some difference in speed between one side and the other, but need to limit that diffrerence

All thebest

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing