Re: Motorcycle Horsepower Question

On Jan 11, 11:05 am, Turby <turbosur...@xxxxxxxxxxxx> wrote:
On Fri, 11 Jan 2008 05:08:43 -0800 (PST), "tomor...@xxxxxxxxx"





<tomor...@xxxxxxxxx> wrote:
On Jan 11, 3:18 am, Turby <turbosur...@xxxxxxxxxxxx> wrote:
On Thu, 10 Jan 2008 21:38:04 -0900, "Robert Bolton"

<robertboltond...@xxxxxxx> wrote:
I found a reference that said net horsepower was used beginning of 1971
per SAE J1349.  The same reference said J1349 was reissued (2004) to close
some loopholes.

http://www.dodgetalk.com/forums/showpost.php?p=455579&postcount=1

Here's an interesting reference -
http://www.dmv.ca.gov/pubs/vctop/d03_6/vc9950.htm

California seems to require published horsepower to be net hp as defined
by SAE J1349.

Net vs gross still refers to the output shaft of the _engine_, not
rear wheel, which is where the big difference is, of course.

FWIW, I have access to all the SAE specs at work, but I'm off work for
a while, so it will be some time before I can post what they say. I
think it is a moot point. HP is all just a pissing contest, whether
it's engine or rear wheel, and it only matters in competition, where
so many other factors are also so important, such as handling,
strategy, competitive skill, traction, etc. In the real world, nobody
cares about the last 10% of hp, or probably even much more than that.

Leaving aside the question of whether anyone can put the last 10% of
horsepower to use or not, imho, in the real world horsepower is much
more than a pissing contest.  People who do not compete at ALL spend
thousands and thousands of dollars in pursuit of additional
horsepower.   Being able to measure those results (regardless of WHERE
the results are measured) is one way to quantify the value returned
for the money spent in that pursuit.

Just as a tiny example, when I bought my 2006 Street Glide, I compared
the cost of my own 95-cubic-inch Screamin' Eagle upgrade on my '04
Road Glide to that of the 103-cubic-inch upgrade that various other
people had done, and based on their actual dyno results compared to
mine, decided that the 103 was a better bang for the buck, and chose
that.  No competion, no pissing contest, just a comparison of two
measurements.

I think people contemplating cat-back exhaust and cold-air intake
systems for their modern 4-wheeled vehicles, or thinking about putting
in a supercharger, etc, often make the same type of cost/benefit
analysis before spending their money.

OK. So, you buy something that may give a few more HP than another
product. Why? I can understand modifying a bike for better ergos,
better handling, safety, and a bunch of other reasons. But at some
point, more power is a worthless goal. You need a certain amount of
power to ride successfully  - get up hills, get out of danger's way,
get an adrenalin rush. But when it gets to the realm of comparing
Ninjas to Hayabusas, there's no value in the numbers. If you say the
103 is more bang for the buck than the 95, that's economics, not
power. It sounds like what you're really saying is the stock was
underpowered for your needs, and either the 95 or the 103 is good
enough in terms of power, but the 103 is the more economical choice.

Nope. I was saying that I gave ample consideration to value when I
compared the three options. The 95-cubic inch was NOT enough for me,
but I would have SETTLED for it if the cost of upgrading to the 103
was even more expensive per unit of increase than the 95. It wasn't.

However, that doesn't mean that I'm necessarily finished, nor that the
bike wouldn't be MORE fun with even MORE power.

Now that I've upgraded the suspension and brakes, a JIMS 120-cubic
inch, 125hp engine looks like a real good possibility somewhere down
the road a bit, once I recover financially from the current bout of
racing fever that I am stoking.
.

Relevant Pages

  • Re: Motorcycle Horsepower Question
    ... Net vs gross still refers to the output shaft of the _engine_, ... rear wheel, which is where the big difference is, of course. ... it's engine or rear wheel, and it only matters in competition, where ... more power is a worthless goal. ...
    (rec.motorcycles)
  • Re: Wondering if I should.
    ... those who wanted to upgrade the 96ci to a 103ci. ... assured this upgrade was totally warranty friendly with the ... This includes pistons, jugs, cams, gaskets, etc. and labor. ... If Harley doesn't get their shit together I see a Wing in my future and power won't be the driving force in my decision. ...
    (rec.motorcycles.harley)
  • Re: Wondering if I should.
    ... those who wanted to upgrade the 96ci to a 103ci. ... assured this upgrade was totally warranty friendly with the ... This includes pistons, jugs, cams, gaskets, etc. and labor. ... If Harley doesn't get their shit together I see a Wing in my future and power won't be the driving force in my decision. ...
    (rec.motorcycles.harley)
  • Re: Supra Twin Turbo or R32 Skyline GT-R
    ... >> And he's claiming REAR wheel hp, must be around 1200bhp at fly. ... You are aware of the physics required to propel the car ... power is purely an estimate has no effect on calculated speed. ... estimated power at fly 1265bhp is a bit more than my estimate. ...
    (uk.rec.cars.modifications)
  • Re: Amp heads: What has amazed you....
    ... 350W ->4ohm power amp. ... then i found two dead ampeg SVT-II's on ebay for a song, fixed them up, used ... sound, excellent for double bass - the notch filter on this is a revelation. ... each upgrade was an incremental improvement in sound/power. ...
    (alt.guitar.bass)
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