Hyabusa flat 8

"Maxwell" #$$9#@%%%.^^^ wrote in message
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"platypus" wrote in message
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Wicked Uncle Nigel wrote:
Using the patented Mavis Beacon "Hunt&Peck" Technique, "TOG@Toil"
typed
On 6 Mar, 11:03, bod43 wrote:
On 5 Mar, 21:57, "Morgans" wrote:

snip interesting stuff

Maybe someone on uk.rec.motorcycles might have an
idea as to the expected life span of a hyabusa engine
when operated in a constant load regime,
say at 130bhp.

You'd need to boost the low and midrange torque to swing a prop, as
props rotate relatively slowly, don't they? I think a 'Busa engine
would last forever is detuned to 130bhp.

Depends on the prop, but I would think that gearing down would be the
way to go.

The thing that everyone seems to forget when promoting automotive engines
for aircraft is that most piston aero engines have a very hard life.
Take-off and climb is full power or very nearly, then they throttle back
to cruise at 75% or thereabouts. The only roadgoing vehicles that
approach that sort of use are in motorsports, and how long do they last?


Not true at all.

Ever driven a gas powered motor home, pulling a boat trailer. I drove a
6500 series Chevy dump truck years ago, always pulling a Case 580C back
hoe. It was 100% power almost all the time, and always at lease 75% on the
highway. I have seen lots of auto engines successfully suffer MORE abuse
than aircraft engines in many circumstances, and most often do it without
proper maintenance. Some school bus and UHaul truck engines deserve to be
in the Motor Sports Hall of Fame.

But that doesn't solve all the propeller and PSRU issues.



Nicely said.