Episode 203: Helmet Head on Your Face!

Episode 203

April 19, 2015

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Theme music composed and performed by Raoul Lowe

Episode 202 – Podcasters who have gone on a tangent and those who will

Episode 202 – Podcasters who have gone on a tangent and those who will
April 12, 2015

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This week the guys discuss the existential crisis of math as it pertains… ya know what? None of that happens. We do ramble on about the potential coolness of Honda, the Bulldog Concept, and then give a quick mention to some Yamaha recall news. Then we go on and on and on about the whole “those who crash and those who are going to crash” nonsense, give some luggage advice, create a drinking game and ring a bell (make out of a coffee mug). It’s all the rage. Get in on it!

News

Links

Feeback

  • Daniel Mozer
  • Kurt Wahtera
  • Scott Cloninger
  • Dan Klapman
  • Crispin Bennett
  • Dick Young

Episode 201: 40 Feet in the Air

Episode 201: 40 Feet in the Air
Recorded March 25, 2015
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Kristin Casey returns to tell us about back to back race weekends at Roebling Road and Daytona International Raceway. We’ll cover some post-race topics, getting the bike back into racing form, packing up for a race weekend, cleanup after a crash, and hey… who doesn’t like discussing that awesome RV!

kc_tape

Links:

Episode 200 – It may be a day or so late…

Episode 200
March 19, 2015

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We talk. We read feedback. We opine.

Links:

Feedback:

  • Stuart Watson
  • Ward
  • Trevor Ross
  • Jon DelVecchio
  • Justin Varner
  • Nick Tasker
  • Andrew Corson
  • Dave Marzilli

What’s for sale…?

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I decided to take a look at the bikes-for-sale listings on one of the popular motorcycle forums. The forum in question has a focus on ADV bikes, but it’s a large global market place. Anyway, here’s a listing of ads that had activity (new posts, new replies, etc) in a one-day period (business hours, Eastern time). Just found this list interesting.

Discuss: ready… set… GO!

Download (PDF, 34KB)

March 15, 2015 – the break

March 15, 2015

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We’re taking a brake. Duty calls and stuff gets in the way.

Back next week with lots of feedback and discussion!

 

Episode 199: You Want to Keep All of Your Bits

Episode 199: You Want to Keep All os Your Bits

Recorded March 8, 2015

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Show notes will be added Monday evening.

Episode 198: There are only three sports

Episode 198: There are only three sports
Recorded February 27, 2015

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This we we have a few news items and reviews, then it’s hip deep in feedback. ALL THE FEEDBACK!

Review:

Sound Rider gear and equipment

News:

Links:

Feedback:

  • Roland Cannon
  • Patrick Advincula
  • Russell Hoffman
  • Curtis
  • HiPro / Ryan
  • Joel Cramer
  • Cris Bennett (from the blog)

A listener discussion about HP & torque

We got this email from listener Bryan Skinner, and thought the emails back and forth would make a good blog post.

From Bryan:
I stumbled upon your Podcast in search of finding an enjoyable conversation on motorcycling and I’ve really been enjoying listening to you both.

Question: The issue I’m confused about is how can a Yamaha FJ-09 which is 847cc have so much more horsepower than my Honda VTX1300 cc ?

My 1300cc has 57HP and 75 torque verse the FJ-09 847cc and 115HP and 65 torque. Doesn’t cubic inches relate to Horsepower. Is it because the Yamaha is more modern than my 2005yr Honda VTX 1300 ?

James:
Bryan,

Thanks for writing. I think we’ll queue this up for an up coming show but I’ll respond here as well.
Displacement is only part of the equation. It’s really about squeezing quantities of gas and air and making it explode. I don’t know the numbers off the top of my head but I’d guess that the VTX tops out at around 6000 RPM. The FZ-09 probably doubles that number. It has less displacement but it can produce power more often. There are many other factors that can contribute such as compression ratio, power loss to friction in the motor, restrictions in the air box, other design decisions made by the engineers to produce the “feel” that they want out of the engine. RPM and compression are probably the biggest contributors.
On the upside, you’re probably getting better gas mileage AND buying cheaper gas than FZ-09 owners.
Chris:
And if I may expand with some technical details to flesh that out…

Horsepower, while useful for bench racing and marketing, is a mathematically contrived measurement that’s got a lot of factors going into it. In its basest form, calculating HP is simply a matter of taking the torque at an RPM, multiplying it by that RPM, then dividing that number by a fixed value of 5252. 
In the case of your VTX 1800, the I’ve seen docs suggesting that the torque maxes out at 120 foot pounds. To make the math easy, let’s assume a good, flat torque all the way to redline. Your redline is 5750. So the resulting formula is:
T x R / 5252 = hp
120 * 5750 / 5252 = 131.4 , theoretical maximum horsepower.
In the real world, the VTX 1800 gets closer to about 105 hp with around 100 ft lbs of torque. This is because the overall breathing inefficiencies, the torque falling off at higher RPM, and mechanical drag in the engine, etc. 
According to this chart ( http://images.motorcycle-usa.com/PhotoGallerys/05PCTorque.jpg ), the VTX 1800 is good for 98 ft lbs maxed at 3700 RPM, and it starts falling off after that. So, 3700 RPM is where the engine makes its PEAK EFFICIENT POWER (which is different than maximum power) – the formula would then be:
98 * 3700 / 5252 = 69 max EFFICIENT horsepower. 
Using that chart, at max rpm of around 5500, the engine is putting out around 80 ft lbs.
80 * 5500 / 5252 = 83.8 horsepower.
No slouch by any means, especially in the “feel my arms stretch” department. 
So, as you can see, real-world numbers and theoretical, marketing numbers can vary GREATLY. 
You can modify those real world numbers a bit with better exhaust and airbox flow, tuning, etc.
But horsepower, as a thing, is fully contrived and 99.9% completely made up theoretical BS. :)
Me…? I’ll take a nice big torque number a lower or mid-level RPM range over theoretical horsepower all day long. It’s why I like twins and triples so much more than I4s. They develop their torque in lower RPM ranges, typically, and feel more spry around town.
The triple in question revs much, much higher and has a very different feel, and can produce higher contrived, theoretical (and very real) horsepower, but your VTX 1800 is going to FEEL so, so much more powerful in real-life RPM and driving speeds. Because…. it is. The Triple will have to rev much higher and feel more frenetic to develop its higher overall power.
Hope this helps. :)