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Skifastbadly
| | Posted on Monday, May 14, 2012 - 12:21 pm: | 
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Since the fins were designed with the hot spots in mind, it seems leaving them on would help insure that the coolant is effectively moving heat away from the parts it needs to.
Buell was pretty well known for using lots of Finite Element Analysis on their bikes, which is a class of computer software designed to simulate real world behavior of computer models. The fins, I'm certain, were optimized given a certain airflow past them. Unless the flow of water follows the same path as the flow of air, the shape, size, and angle of the fins in the water could range from optimal to irrelevant to problematic. |
Uly_man
| | Posted on Monday, May 14, 2012 - 12:22 pm: |
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"I also live in Texas. It does get hot here. I used to ride year round before I moved here. The summer is brutal, and I frankly don't ride much between June and the end of September anymore, but I am going to try to man up and change that this year! My Uly does have heat issues (pinging), but only in slow, bumper-to-bumper traffic when ambient temps are above 80-degrees. Which is most of my commute most of the year. Which is why I can't commute on the Uly."
Buewulf. The 06 bikes do run VERY hot. I found that a can with a short run allows the exhaust gases to flow away faster which helps engine cooling and also helps to slow the heat build in the can and headers. A thiner gauge can also helps as well. Remember in traffic the can is adding heat to everything else above it IE The engine, frame and you. My 06 bike was ok in traffic at 30c (86f) but I had a Remus can and a Remus fueler. The fueler added more fuel to the low and mid rev range which also helped hot running. With "pinging" or what we call "pinking" you might find that your timing is a touch out.
These bikes run most fuels but they like "The good stuff". Maybe the high humidity of your area does not help either.
I would check to see if your oil cooler is working right because mine did not. It should be hot top to bottom. If not then its not cooling right. If you can make it work it might be worth changing it out for the newer 8 section, yours is 6, version. |
Reepicheep
| | Posted on Monday, May 14, 2012 - 12:39 pm: |
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quote:Buell was pretty well known for using lots of Finite Element Analysis on their bikes, which is a class of computer software designed to simulate real world behavior of computer models. The fins, I'm certain, were optimized given a certain airflow past them.
True, but I'm virtually certain that if Buell called Harley and said "If you changed the fins to be such and such you would get 30% better cooling efficiency under your worst case thermal conditions", the response from Harley would have been "thanks, but we like the way they look now". |
Buewulf
| | Posted on Monday, May 14, 2012 - 01:12 pm: |
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Thanks, Uly_man. The cooler may not be terribly effective. I have had the fan kick on and stay on in pretty cool weather which surprised me. I need to get the bike running right before I look into that. I'll be checking timing and changing plugs and stuff, too if I get the bike going, so we'll see. |
Crackhead
| | Posted on Monday, May 14, 2012 - 01:30 pm: |
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Reepicheep, you forgot, "By the way, have your guys figured out how to chrome, chrome?" |
Jsg4dfan
| | Posted on Tuesday, May 15, 2012 - 05:26 pm: |
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I'm taking a stab that Court's quip/quote, which I think was passed over a bit quickly, might hint at an engineering design used on the P51 Mustangs. If I recall correctly, it used the thermal expansion of the air passed over the radiator to actually produce a small amount of thrust, increasing the top speed of the plane by a significant amount. The outlet in that design drawing would be dumping hot, expanded, high speed air directly into what is probably the the most turbulent, low-pressure and aerodynamically "dirty" areas of the bike. My feeble armchair engineer skills suspects it would have added quite a bit to the top speed of the bike. Court? |
Buewulf
| | Posted on Tuesday, May 15, 2012 - 06:37 pm: |
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I believe you are referring to the Meredith Effect. I am no expert in WWII era aircraft, but my understanding is that pretty significant airspeeds were needed to generate material effects. Not sure how much benefit a street motorcycle would benefit from the additional thrust. I believe thrust is developed at around 300 mph give or take, and that the air needs to be compressed before it passed over the radiator. It works like a ramjet, though expansions comes from taking on heat from the radiator rather than combustion of fuel. |
Natexlh1000
| | Posted on Tuesday, May 15, 2012 - 08:28 pm: |
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Crusty brought up the NOVA.
I took pics in the H-D museum:
I took an absurd amount of pictures in that museum 
(The engine wall just about made me wet my pants)
Anyone want full-rez pics, just let me know. |
Natexlh1000
| | Posted on Tuesday, May 15, 2012 - 08:34 pm: |
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Oh yeah and they had the XB9 running prototype.
WELDED frame. Was awesome.
note all of the extra instrumentation on the exhausts and sticky stuff still on the airbox cover presumably for holding cableties and stuff. |
Sparky
| | Posted on Wednesday, May 16, 2012 - 02:39 am: |
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Ooh, that almost looks like my old '87 FXRT. Cool bike, that was. Really miss its 80 watt stereo AM/FM/stereo tape player these days... |
Hughlysses
| | Posted on Wednesday, May 16, 2012 - 09:54 am: |
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It'd be really interesting to visit the alternate universe where HD management decided to put the Nova into production and see how that would have turned out. That decision is where they started that mindset that Harleys must remain air cooled and look "traditional" for all eternity.
Imagine if the first Buells could have been based on a Nova V-4... |
Natexlh1000
| | Posted on Wednesday, May 16, 2012 - 10:36 am: |
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The engine wall had an overhead cam sportster engine from 1975 and some other odd variant where the heads were on "sideways". |
Rdkingryder
| | Posted on Wednesday, May 16, 2012 - 07:58 pm: |
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"How could you (or better yet, why would you) put an air-cooled engine in a big metal box? Who does that? "
http://ts3.mm.bing.net/images/thumbnail.aspx?q=506 2499974710570&id=ea1f9c5ce473385a959e6f95e8093130 |
Hughlysses
| | Posted on Thursday, May 17, 2012 - 07:47 am: |
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The engine wall had an overhead cam sportster engine from 1975 and some other odd variant where the heads were on "sideways".
I remember seeing a photo of the OHC Sportster in "Hot Rod" magazine's motorcycle column way back when. Got a photo of that? |
Natexlh1000
| | Posted on Thursday, May 17, 2012 - 09:55 am: |
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I got photos of everything in that place!
I need to put them all up on an image hosting site so that you all can see them in full resolution. (I'm at work now though) |
Pons
| | Posted on Thursday, May 17, 2012 - 10:30 am: |
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To Natexlh1000:
Nice pics. A good site for pics is www.Pbase.com You get a lot of space for the money and have many options and how to display your pics. I've been on there about 10 years  |
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