Boss Hoss parked in Buxton today

[Stu R]

gather it's yours?

Absolute lunacy Bet it's fun in a straight line?

[Hyperion]

I tend to think of these machines as less of a bike - more musical instrument (on wheels)
Imagine riding that through the Hatfield tunnel

[rev-erend]

Riding God said:

King Herald said:

Riding God said:

I'm not seeing any sort of cooling system, so obviously not a street bike. I wonder what drive system it uses?

Radiator and elec fan mounted flat under motor. Cooling system works fine.

Range Rover flywheel and clutch. Clutch shaft - sprocket welded on end - supported bearing housing. Chain drops diagonally right linking shortened Kawasaki GT750 shaft (drive) - sprocket welded on end of shaft - supported bearing housing. GT750 diff driving Merc 15 inch alloy - Fiesta vented disc / caliper inside wheel.

Q plate, road legal.

Heavy as fk, handles like a pig. Huge potential for improvement.

Proper monster bike

[Beemer-5]

rev-erend said:

Talking of car engined bikes - do you remember the Shifty in the late 70's..

The engine was from a Fiat .. about 1 litre ..

Looked like the hunch back of notre dame..

Blimey, yeah. I had forgot about that one!

[Beemer-5]

Stu R said:

Please tell me that's an AJP powered bike

Edited by Stu R on Tuesday 21st October 23:03

Please tell me the engine's tuned!

[Beemer-5]

A Boss Hoss Sports bike?

As much alloy and carbon as possible, lightweight everything, single seat, basic instrumentation, wouldn't need to weigh more than 400 kgs!

[King Herald]

Riding God said:

King Herald said:

Riding God said:

I'm not seeing any sort of cooling system, so obviously not a street bike. I wonder what drive system it uses?

Radiator and elec fan mounted flat under motor. Cooling system works fine.

Range Rover flywheel and clutch. Clutch shaft - sprocket welded on end - supported bearing housing. Chain drops diagonally right linking shortened Kawasaki GT750 shaft (drive) - sprocket welded on end of shaft - supported bearing housing. GT750 diff driving Merc 15 inch alloy - Fiesta vented disc / caliper inside wheel.

Q plate, road legal.

Heavy as fk, handles like a pig. Huge potential for improvement.

I've dreamed of building such an animal for years. Back in the eighties I had a GT750 Suzuki rolling chassis and a RV8 lined up to build just like yours. Never quite got it finished though. Seems to be a recurring theme in my life.

The single gear ratio must play hell with riding, as the RV8 doesn't have that huge a spread of torque, 0-150mph in one gear? Mind you, once you get up to the ideal geared speed it would be grand with that V8 burble and power on tap.

Here's some more detail of the 1000lb Chevy I built, engineering on a far heavier scale than the bike in your pic.





I can feel the creative juices flowing again....

[Beemer-5]

Thinking out loud here.
What IS the most compact V8 car engine, i wonder?
(Nothing out of a 2007 Ferrari, you understand!)
Something available for sensible bucks.

Something like the 5.0 version of a Rover V8, as found in a TVR Griffith.
Is that any smaller and lighter than say a 5.0, 302 cubic inch Mustang engine?

[rev-erend]

Beemer-5 said:

Thinking out loud here.
What IS the most compact V8 car engine, i wonder?
(Nothing out of a 2007 Ferrari, you understand!)
Something available for sensible bucks.

Something like the 5.0 version of a Rover V8, as found in a TVR Griffith.
Is that any smaller and lighter than say a 5.0, 302 cubic inch Mustang engine?

The TVR tuscan V8 will fit in a 22 inch cube - so is very compact.

[cyberface]

rev-erend said:

Beemer-5 said:

Thinking out loud here.
What IS the most compact V8 car engine, i wonder?
(Nothing out of a 2007 Ferrari, you understand!)
Something available for sensible bucks.

Something like the 5.0 version of a Rover V8, as found in a TVR Griffith.
Is that any smaller and lighter than say a 5.0, 302 cubic inch Mustang engine?

The TVR tuscan V8 will fit in a 22 inch cube - so is very compact.

Given the problems of packaging V8s in bikes - I suppose with an eye to maintenance you'd want to avoid bucket-and-shim valve adjustment though? An all-ally pushrod V8 like the Chevy LS1 would be ideal, no? Certainly along the same lightweight lines as the ally RV8 but with proper power and without the design flaw of readily rounding off camshafts.

Surely with the weight of a bike you could use the engine as a stressed member and do without heavy cradle frames around the engine - a V8 should be smooth enough to prevent monstrous vibration? Just bolt a swingarm to the back of the block and some forks to the front

Of course, I've never even tried engineering such as this so my ideas may be idiotic. But it sure looks like fun, even if I'd personally be too scared to ride a bike with 500 foot pounds of torque and similar horsepower

[Beemer-5]

I am no engineer, one or two others (above) may know better, but i'd think that the torque of a 5.7 or 7.0 or 8.2 litre Chevvy motor would shake the bike to bits, without a strong frame???

That or the motor would take off, of it's own accord and leave the rest of the bike and you behind!

[cyberface]

Beemer-5 said:

I am no engineer, one or two others (above) may know better, but i'd think that the torque of a 5.7 or 7.0 or 8.2 litre Chevvy motor would shake the bike to bits, without a strong frame???

That or the motor would take off, of it's own accord and leave the rest of the bike and you behind!

I was thinking that plenty of formula race cars use the engine as a stressed member, hanging the gearbox and rear transmission / suspension off the back of the engine... and cars like this put a lot more torsional loading on the 'frame' of the 'chassis' due to 4 fat contact patches and downforce - must be easy on a bike, there won't be as high transverse 'twisting' of the engine block under cornering forces.

I'd have thought the block itself would be a stiffer lump of metal than any tube frame, just bolt the front and back bits of the bike to respective ends of the engine

Then again, I'm no engineer either, I just love seeing the creations of those who *do* have the talent and skill to make mad machines like this

[Beemer-5]

Off topic, but i love the few bikes there have been with 'no frame'.
The idea has never caught on with the big makers, so it can't be all good, but hub-centre steered, frameless bikes are awesome creations.

[King Herald]

Beemer-5 said:

I am no engineer, one or two others (above) may know better, but i'd think that the torque of a 5.7 or 7.0 or 8.2 litre Chevvy motor would shake the bike to bits, without a strong frame???

That or the motor would take off, of it's own accord and leave the rest of the bike and you behind!

Boss Hosses obviously don't fly to bits. My 1200 Sportster feels like it is on the verge of self destructing once you reach 2800rpm, and a large capacity v8 runs so much more smoother than that.

The V8 I built felt real smooth with the motor running, even though I never got to actually drive it more than two metres. It certainly felt good revving a big V8 with a motorcycle throttle control.

My bike had the front of the frame suspended from the exhaust manifold studs, and the rear was held on by the ally plates bolted to the ends of the motor.

[Beemer-5]

So a frameless Boss Hoss would work?

[King Herald]

Beemer-5 said:

So a frameless Boss Hoss would work?

Yep.


But Boss Hoss is just so 'yesterday'.

What you need is a blower, to make some SERIOUS power, forget all that 'streetable' stuff:







http://www.gizmag.com/go/6762/

[John D.]

Love this thread chaps.

[Xenocide]

^

st the bed, look at the exhaust. Bet that makes a bit of a racket.

[Hooli]

wow just wow!

[Riding God]

cyberface said:

Surely with the weight of a bike you could use the engine as a stressed member and do without heavy cradle frames around the engine - a V8 should be smooth enough to prevent monstrous vibration? Just bolt a swingarm to the back of the block and some forks to the front

The 'TVR bike' has no frame. The front and rear sections are separate and bolt to either end of the motor.

It is mock built only, though it has lots of potential to actually work quite well. Maybe one day soon I'll give it the attention it deserves and finish it. That and give it a 300 + HP motor.