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Gearheaderiko
| | Posted on Sunday, March 05, 2017 - 09:50 am: | 
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Since Montana has many more dirt roads than paved, I added this to the garage. I could've Ulyfied the XBlast or off-roaded a Blast, but this seemed a better choice (and I've wanted one forever).
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Ezblast
| | Posted on Sunday, March 05, 2017 - 03:40 pm: |
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Very nice!!! Their 390cc bike is very nice as well.
EZ |
Gearheaderiko
| | Posted on Sunday, March 05, 2017 - 04:04 pm: |
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The reviews say the 390 is an overweight underpowered wannabe. It's just a cool looking standard, nothing more. Very disappointing. But we'll see how it's history plays out. It is a good looking bike. |
Court
| | Posted on Sunday, March 05, 2017 - 06:51 pm: |
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It's a great looking bike . . . I'm willing to bet you have a great time with it.
It's about the enjoyment my friend . . . . |
Patches
| | Posted on Wednesday, July 17, 2019 - 06:34 am: |
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Wheels Through Time Museum |
Missionbolts
| | Posted on Thursday, July 18, 2019 - 08:44 pm: |
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Patches,
Would you happen to also have anything on the patents that were displayed there?
This is an example of a 4-stroke that does not use a separate camshaft. The cam lobes were on the crankshaft. This detail alone was the basis for Marks claim that this engine was significantly simpler than any other. So I imagine there is a very interesting design covered by one of those patents
I can't find anything in the USPTO advanced patent image database filed under Marks name, other than a hand crank starter and a pencil sharpener
Sometimes, the older stuff doesn't get indexed properly and you just have to have the complete patent number in order to get any results
Were you actually at this museum? If so, could you go back and get that patent number? Much obliged, thanks! |
Missionbolts
| | Posted on Thursday, July 18, 2019 - 10:29 pm: |
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Kept digging into that and found the patents
The relevant patent for the engine was only a 'pending application' during the time period when Mark was attempting to sell his idea to Schwinn. This application had been filed 6/22/1938 serial #220,790. This application was finally granted 4/23/1941 #2,238,208
Now I can see that the cam lobes were actually located on the transmission input shaft, which was being driven at one-half the engine crankshaft speed with a set of gears on the right-hand side of the engine
The patent clearly states the improvements were all about collecting the various typically separate components such as the transmission & engine and combining them into a unitized assembly. There's actually nothing said or shown about the way the valves are operated. Looks like my first search results were bogus, the story about the cam lobes being placed on the crank were just a bit off. Using the transmission input shaft as the camshaft is an interesting solution to reduce the parts count. But nowhere near as interesting as I had hoped for
This idea was fascinating enough, that I just had to sketch out a way to actually have the cam lobes on the crankshaft. My design allows the lifters to bypass the lobes once every other revolution, but isn't necessarily an improvement as it requires another set of moving parts |
Patches
| | Posted on Saturday, July 20, 2019 - 10:20 am: |
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I was looking at prewar Board Track Racers when I seen the pictures Mark Wade Anthony 1939 Harley Davidson.
Pre-unit Big Twin converted to unit construction 30ci Single like the Blast.
"Dale's Wheels Through Time
June 30, 2018 ·
This single cylinder "Knucklehead" is a one of a kind machine that was built by Mark Wade Anthony in 1939, but never made it to production. Mark completed this 30+ c.i. prototype in 1940, and claims that it has half the moving parts of a standard Harley-Davidson Knucklehead. This bike is capable of speeds up to 80 mph and cruises comfortably at 65 mph." -c.o. facebook |
Missionbolts
| | Posted on Saturday, July 20, 2019 - 12:09 pm: |
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Well, seeing as this MWA does not have a rear cylinder, then obviously there's one less piston, rod, set of valves, rockers, pushrods & lifters. But then to also ditch the camshaft & make use of the transmission input shaft as a cam - that really does make for half the moving parts. The patent 2,238,208 shows in enough detail, all the moving parts inside the engine. The gear-set that connects the crankshaft to the transmission input shaft is doing three jobs at once. It is also providing the 2:1 ratio required by the valvetrain in order to drive a set of cam lobes. This is why the pushrods are running well to the rear of the cylinder, as they are being routed to the centerline of the transmission input shaft. Another job done by those gears is to act as the oil pump
None of those design changes could have worked without making the entire engine & transmission a single unit design. So the MWA was really ahead of the game
The Blast has several advantages over the MWA, just in the engine design. Never mind the frame geometry & brakes. The MWA pushrods are excessively long and will really add some weight to the valvetrain, so that alone will really shut down any attempts to get more RPM's out of the motor. Plus the cost savings in making use of a proven engine design is simply how a production bike succeeds. The Blast engine doesn't have one single thing inside it that required any serious R&D. Which actually is kinda tragic, as it really needs some refinements. Just for starters, the intake port area cross-section is much too large for a displacement that small. But, some JB Weld can fix that very easily
If the MWA was my design, I would tilt the cylinder rearwards so as to get those pushrods as short as possible. Plus that would allow a more compact frame. I would also have the intake running in from the front with the exhaust going out the back, like an ATK. The MWA only has three gears, and they are not the constant mesh type like we are used to. The patent drawings do not show any gear synchros, so shifting that bike will take a bit of skill with the throttle
I have a design for a beltless CVT that could have been made in 1900 using what was available back then, that is what I would like to see in a bike like that. My CVT could handle up to 30Hp on a lightweight bike with no problems. With modern alloys, it could go up to 80Hp |
Patches
| | Posted on Saturday, July 20, 2019 - 02:34 pm: |
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“Sons of Speed”
Billy Lane, bring board track racing back to life. |
Patches
| | Posted on Sunday, March 19, 2023 - 07:04 am: |
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buell blast 650cc single 4 valve twincam m8 xb race motor
https://www.youtube.com/watch?v=PQojHnOzB3U&list=P L-BX_Pc-GUyQG5w_YvE3sj8M3bY1p89x- |
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