Runs 30, 35, 38, 41, 47 were all run on the same engine with the same engine specifications. Some runs were run on the same day, some were run about 10 days later without unstraping the bike or making any changes to the engine. Atmospheric test condition were very close to the same for all test.
The Power Pros was a drag pipe
The Q pipe was a hand coned pipe built to fit the hybrid chassie
The HPR pipes 7, 8, 9 were inframe test pipes previously built during pipe development.
Jerry Hall
Oh man... My freekin iPad doesn't do those files!
The XPS viewer is available online for free. I use it because it allows me to publish the dyno files with the run information attached to the dyno chart.
What is the '-C' suffix on the Hall pipe?
Thanks for the suggestion Jerry.
Careful. I downloaded the xps viewer and the viewer works fine but it filled my computer with so much malware and I am flooded with overwhelming pop up ads.
That's where the naked girls came from!!
What is the '-C' suffix on the Hall pipe?
The "C" corresponds to a specific pipe drawing.
Example:
HPR 7 was a completely new pipe with a new set of dimensions and a corresponding drawing of those pipe dimensions labeled HPR 7
If HPR 7 is modified it now becomes HPR 7A and there is a HPR 7A drawing. If HPR 7A is modified, it becomes HPR 7B. The third modification to HPR 7 turns it into HPR 7C and so on.
A modification may entail removing 5mm from the head pipe or it could mean one section of the pipe was removed and replaced with a different cone angle.
The engine sees each pipe number or a pipe number with a different suffix as a different pipe with different dimensions.
During pipe development, we try to modify a pipe as many times as possible before we start over with a completely new pipe. It is common for each pipe number to have five or more modifications. As you can see, pipe development is an expensive time consuming process, usually requiring 10 or more different pipes and sometimes testing over 100 different pipe dimensions before selecting one particular set of dimensions to use for the production pipe.
By the time we are ready to go into production we have a huge library of pipe dimensions, corresponding dyno and field-testing results and the specifications for all of the different engines used during the developmental process. Having this huge database of pipe dimensions and corresponding dyno curves allows us to modify or analyze the dimensions from just about any pipe on the market and have a high level of confidence of how it will perform because we have “already been there”.
Tell us more about this engine. And what was the design goal of HPR9? Aside from a little more torque, its not on par with 8 with this setup. Was there a 9b or other? Finally, does the HPR19 have a suffix?
Tell us more about this engine. And what was the design goal of HPR9? Aside from a little more torque, its not on par with 8 with this setup. Was there a 9b or other? Finally, does the HPR19 have a suffix?
Every engine/pipe bulilders goal may be different. Some want a package that will pull stumps, while others want their engines to rev to the moon so that it can win the land speed record with stock gearing. The goal for most of my pipes and engine setups is to produce the most acceleration for a given package. The majority of my customers are not trying to clear stumps from a logging site or become pavement racers. To accomplish my goal, the power curve shape has to be optimized for a particular application. Unfortunately every new test pipe is not better than the previous design. This is why I do a lot of testing. If every test pipe was better than the previous design, pipe #10 would have made 500 HP.
Pipe number 9 had 8 to 10 suffixes. Why does the number of suffixes matter? Pipe building is not like software where every new revision fixes some particular bug. Each new test pipe hopefully has a smoother curve with a higher power average.
HPR 19 did not have a sufffix. HPR-19 was HPR-18-? with some dimension changes. I stopped at HPR-19 because at the time, the HPR 19 covered all of the other pipes power curves like a big umbrella. Recent testing of new pipes on the market, shows that there is not a need to add a suffix to HPR-19 at this time.
....Recent testing of new pipes on the market, shows that there is not a need to add a suffix to HPR-19 at this time.
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Like a Boss