Suzuki Hayabusa Inline Five

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Rage
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Joined: Mon Jan 08, 2018 5:03 pm

Suzuki Hayabusa Inline Five

Post by Rage » Mon Jan 08, 2018 5:08 pm

I think this is a very cool project :)

https://www.engineswapdepot.com/?p=20296

humble sabot
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Joined: Sat Feb 17, 2007 9:33 am

Re: Suzuki Hayabusa Inline Five

Post by humble sabot » Fri Jan 26, 2018 5:06 am

I'm trying to understand the justification for ever building a 5 cylinder at all. But It's an interesting choice.
the four immutable forces:
static balance
dynamic balance
static imbalance
dynamic imbalance

Facts Only
270
Joined: Thu Jul 03, 2014 9:25 am

Re: Suzuki Hayabusa Inline Five

Post by Facts Only » Fri Jan 26, 2018 11:51 am

People have literally run out of things to do with Hay abusa engines by the looks of it. Turbocharged, Supercharged, Big Bore, Long Stroke, billet block for hewland gearbox, V8 version all been done so now it's this. Seems a tad pointless but I bet it will sound mental.
"A pretentious quote taken out of context to make me look deep" - Some old racing driver

roon
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Joined: Sat Dec 17, 2016 6:04 pm

Re: Suzuki Hayabusa Inline Five

Post by roon » Fri Jan 26, 2018 8:37 pm

Opinions Only wrote:
Fri Jan 26, 2018 11:51 am
People have literally run out of things to do with Hay abusa engines by the looks of it. Turbocharged, Supercharged, Big Bore, Long Stroke, billet block for hewland gearbox, V8 version all been done so now it's this. Seems a tad pointless but I bet it will sound mental.
Single, twin, triple, I6, V16, flat-8, and coffee-table variants still have yet to see the light of day.

RicME85
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Joined: Thu Feb 09, 2012 12:11 pm
Location: Derby

Re: Suzuki Hayabusa Inline Five

Post by RicME85 » Sat Jan 27, 2018 12:38 pm

humble sabot wrote:
Fri Jan 26, 2018 5:06 am
I'm trying to understand the justification for ever building a 5 cylinder at all. But It's an interesting choice.
Isnt it hat they are just trying to squeeze an extra cylinder into an existing frame rather than plucking 5 cylinder out of the air as an idea for a project

humble sabot
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Joined: Sat Feb 17, 2007 9:33 am

Re: Suzuki Hayabusa Inline Five

Post by humble sabot » Sun Jan 28, 2018 1:13 am

Why one then? Why not two and end up with a straight six? They're inherently smoother.
People have been making V8s from motorcycle engines for a few years now.
the four immutable forces:
static balance
dynamic balance
static imbalance
dynamic imbalance

RicME85
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Joined: Thu Feb 09, 2012 12:11 pm
Location: Derby

Re: Suzuki Hayabusa Inline Five

Post by RicME85 » Mon Jan 29, 2018 12:51 pm

because that is all the space they have got in the existing frame

Maritimer
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Joined: Wed Sep 06, 2017 8:45 pm
Location: Canada

Re: Suzuki Hayabusa Inline Five

Post by Maritimer » Mon Jan 29, 2018 2:33 pm

Nevermind this, passive aggressive negative voters can kiss my butt :lol:
Last edited by Maritimer on Mon Jan 29, 2018 8:09 pm, edited 1 time in total.

humble sabot
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Re: Suzuki Hayabusa Inline Five

Post by humble sabot » Mon Jan 29, 2018 4:22 pm

I've never heard that.
the four immutable forces:
static balance
dynamic balance
static imbalance
dynamic imbalance

Benard Bonhomme
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Joined: Wed Nov 15, 2017 2:52 pm

Re: Suzuki Hayabusa Inline Five

Post by Benard Bonhomme » Mon Jan 29, 2018 5:07 pm

Maritimer wrote:
Mon Jan 29, 2018 2:33 pm
Inline 5 have the best natural balance iirc, even better than 6s
It is not about the balance, but the irregularity of the engine. Generally, engines with an uneven number of cylinders have an irregularity way better than engines with an even number of cylinders:

https://www.gtisoft.com/wp-content/uplo ... ITE_GM.pdf

sosic2121
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Joined: Wed Jun 08, 2016 11:14 am

Re: Suzuki Hayabusa Inline Five

Post by sosic2121 » Mon Jan 29, 2018 6:24 pm

Maritimer wrote:
Mon Jan 29, 2018 2:33 pm
Inline 5 have the best natural balance iirc, even better than 6s
I don't think that's true. Inline 5 requires balancing shaft.

Maritimer
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Location: Canada

Re: Suzuki Hayabusa Inline Five

Post by Maritimer » Mon Jan 29, 2018 7:47 pm

sosic2121 wrote:
Mon Jan 29, 2018 6:24 pm
Maritimer wrote:
Mon Jan 29, 2018 2:33 pm
Inline 5 have the best natural balance iirc, even better than 6s
I don't think that's true. Inline 5 requires balancing shaft.
Good enough then, lower internal friction might be what im thinking of

Greg Locock
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Joined: Fri Jun 29, 2012 11:48 pm

Re: Suzuki Hayabusa Inline Five

Post by Greg Locock » Mon Jan 29, 2018 8:15 pm

True boxers, I6 and v12 (which is basically two I6s) have the best natural secondary balance . A balancer shaft works at one harmonic only (typically twice crankshaft speed aka second order) , but the piston on crank assembly generates a whole series of forces, not just second order.

i5s and v10s aren't horrible, but they aren't anything like as smooth as an I6 unless they have a balancer shaft. I3s and 90 degree V6s and your usual I4 all create lots of powerful inertial forces.

Roughly speaking an I4 vibrates at 20 g rms at the redline at WOT, an I6 is at 5g rms. 10-1000 Hz.

The disadvantage of I6s and so on is that the crankshaft is so long that you run into torsional and bending problems with the crank.

Friction wise, the fewer cylinders the better for a given capacity , and a balancer shaft also adds friction.

Tommy Cookers
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Joined: Fri Feb 17, 2012 3:55 pm

Re: Suzuki Hayabusa Inline Five

Post by Tommy Cookers » Mon Jan 29, 2018 9:55 pm

a Mr Duckworth said DFV valve motion produced bigger forces than those normally regarded as the causes of vibration

Mudflap
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Joined: Wed Feb 17, 2016 8:36 pm

Re: Suzuki Hayabusa Inline Five

Post by Mudflap » Sun Feb 11, 2018 2:47 pm

Tommy Cookers wrote:
Mon Jan 29, 2018 9:55 pm
a Mr Duckworth said DFV valve motion produced bigger forces than those normally regarded as the causes of vibration
Mostly because his 'constant acceleration cams' were particularly bad.
DFV cams were pretty out of date even for that time - the acceleration profile consisting of 3 'constant acceleration' plateaus resulted in infinite jerk at each transition.

His compliant idler was a clever band aid but spring failures were never really cured.
How much TQ does it make though?