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Joe. Mercury made a 2 stroke DI outboard. Pretty sure they had multiple variants of it too. V6 Optimax is what they were called.
I think it's discontinued though. |
The 2 stroke classes in outboard racing is extremely popular.
(SST boats) Though I think these are regular carburated engines. https://cimg6.ibsrv.net/gimg/www.mia...3ab6127392.jpg |
Originally Posted by Erat
(Post 1611351)
Joe. Mercury made a 2 stroke DI outboard. Pretty sure they had multiple variants of it too. V6 Optimax is what they were called.
I think it's discontinued though. While it was using DI for fuel delivery, it seems to be an otherwise ordinary 2 stroke. I infer this from the fact that the literature boasts of how "Mercury engineers installed an ECM-controlled oil pump that oils connecting rods directly. With the ability to electronically control the pump, oil ratios vary from 400:1 at idle to 44:1 at wide-open throttle. As a result, OptiMax engines use up to 50 percent less oil and run virtually smoke-free." So it's still burning its own lubricating oil. As automakers struggle to keep internal combustion relevant, wouldn't it be great to develop an ICE which has double the power-to-weight ratio of any other on the market, and an eighth the moving parts, without sacrificing either fuel efficiency or emissions? What am I missing that makes a supercharged, sealed-crankcase DI 2 stroke not an avenue worth exploring here? |
It might be, Joe. But the industry is looking for something other than fossil fuelled ICE, or fossil fuelled anything. The investment is swinging into electric (for better or worse) and investing in better ICE engines looks a bit like breeding 6-legged horses as Henry was firing up the T model production line.
The trucking/shipping use case might be a basis for its examination, but for more mainstream personal transportation electric has the momentum. That could change if some ICE-related innovation emerges, but if the tipping point hasn't yet been reached, it is not far away. I see Tesla has pulled its web pages for the cybertruck, while Ford seems to be saying that it is going battery for the F series - are Tesla reacting to Ford, do they have another ace up their sleeve? |
@Joe Perez , Did you watch the video I posted in 31471? Ferrari used crankcase oil, a positive displacement supercharger, and an exhaust valve. Almost exactly what you are asking about, except for the 120* (I am picturing a radial engine) arrangement.
DNM Gee Emm. Electric vehicles is a recipe for shortages until nuclear power is brought in to produce the electricity the vehicles need. They will only speed the USA into its transition into a third world nation. EDIT: Erat... I think the motor you show on the green boat has the letters "FI" on it, which I take to mean "Fuel Injected". |
I think it says F1 for NGK formula one series.
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Originally Posted by DNMakinson
(Post 1611382)
@Joe Perez , Did you watch the video I posted in 31471? Ferrari used crankcase oil, a positive displacement supercharger, and an exhaust valve. Almost exactly what you are asking about, except for the 120* (I am picturing a radial engine) arrangement.
And while that was definitely moving in the direction I was thinking of, it stopped short. GDI wasn't really a thing in the 90s, so I get that. The engine also appears to have a camshaft driving exhaust valves, which sorta makes sense if you're aiming to score that last little bit of power for a racing engine, but takes away some of the advantages of the overall design concept for a street engine. Here's what's really bugging me: 1: New gasoline / ethanol engines are still being designed by mainstream automakers. Toyota is working on a compression-ignition design, Nissan and GM are doing variable compression, etc. But they're all variations on the 4 cycle OHC theme. 2: Crackpot inventors are also coming up with all sorts of wild engine designs in an attempt to score investor funding. Opposed-piston, weird rotary things, things with swish-plates, etc. But they're all obviously going for maximum absurdity in order to create something truly novel and patentable. What happened to the middle-ground? |
Originally Posted by Erat
(Post 1611418)
I think it says F1 for NGK formula one series.
EDIT: Understood, Joe. |
I have not watched this yet. But it is a look at continuing research into improved ICE's. |
Originally Posted by DNMakinson
(Post 1612190)
I have not watched this yet. But it is a look at continuing research into improved ICE's.
One thing that will improve gasoline engines is a hydrogen/gasoline hybrid. Hyrogen has a very high flame front which will help dramatically with combustion. Mythbusters did a shit experiment on it long ago but they fucked it up because they didn't retard the timing at all and got tons of knock. This is how HHO water/hydrogen models work.. the goal here is to mix in hydrogen to get a benefit of the flame front which improves combustion of the gasoline mixture. Here's the mythbusters episode highlights in a random video. first they screwed up royally on the HHO generator so that was a fail but in the end, they powered a vehicle with strictly hydrogen which again worked but didn't work properly because they were running at 20 degrees advanced timing.. 2:45 for the hydrogen experiment. Straight off of the website here.. The flame speeds are not the actual engine flame speeds, A 12:1 compression ratio gasoline engine at 1500 rpm would have a flame speed of about 16.5 m/s, and a similar hydrogen engine yields 48.3 m/s, but such engine flame speeds are also very dependent on stoichiometry. (http://www.faqs.org/faqs/autos/gasol...section-1.html) |
Originally Posted by triple88a
(Post 1612223)
One thing that will improve gasoline engines is a hydrogen/gasoline hybrid.
The problem with hydrogen is that it doesn't exist. At least not in its pure form, in nature. Hydrogen *really* loves to spontaneously combine with other stuff, like oxygen and carbon. Or, if you're having a particularly bad day, both of them at the same time, plus a dash of nitrogen. Obtaining pure hydrogen, therefore, is a real ball-buster. The vast majority of hydrogen produced at industrial-scale is from steam-reformation of hydrocarbons. Meaning that you take fossil fuel, put a bunch of energy into it, and get some hydrogen (plus a bunch of carbon monoxide) out of it. The resulting hydrogen contains *way* less energy than the original fossil-fuel did, and you still used up that fossil fuel and released all of the carbon from it. Of course, hydrogen can also be obtained by running electricity through water. This is massively inefficient and costly, which is why it's not done at large scale. Also, most of the electricity in both the US and the world comes from (drumroll, please...) fossil fuel. So why not just build tons of solar / wind generation, and use those to electrolytically liberate hydrogen? Well, yeah. You can totally do that. Except that it's still massively inefficient, and you wind up with way less useful energy in the end than you would have by just using that electricity to charge batteries. Unless something really amazing happens in the foreseeable future, hydrogen is a dead-end technology as a vehicle fuel. Speaking of batteries... CHEAP TOOL ALERT! Do you own at least one Ryobi One+ battery already? Then go to Home Depot and buy this Ryobi inflator for $19.97 while supplies last: https://www.homedepot.com/p/RYOBI-ON...737D/307627867 https://cimg2.ibsrv.net/gimg/www.mia...d21dfb4d6a.png |
Originally Posted by Joe Perez
(Post 1612393)
The problem with hydrogen is that it doesn't exist. At least not in its pure form, in nature.
(but I agree, hydrogen makes no sense as internal combustion engine fuel for cars) --Ian |
Originally Posted by codrus
(Post 1612394)
Sure it does -- just not on Earth. :) LOTS of the stuff on Jupiter.
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I has a sad. With the first snowfall of the season, the Miata is off the road until spring.
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Today I learned:
The Samurai were officially abolished as a caste in Japanese society during the Meiji Restoration in 1867. The first ever fax machine, the "printing telegraph," was invented in 1843. And, of course, Abraham Lincoln was famously assassinated in 1865. Which means that there was a 22 year window during which, in theory, a Samurai could have sent a fax to Abraham Lincoln. |
I am currently serving day 7 of a two week house arrest.
2 weeks is the standard sentence for testing positive for Covid. Delta variant, to be precise. The only symptom I can report is loss of smell. I am pretty much normal other than that. I feel sorry for the virus for messing with me. |
Originally Posted by Godless Commie
(Post 1613978)
The only symptom I can report is loss of smell. I am pretty much normal other than that.
You were never normal. :giggle: |
Originally Posted by Godless Commie
(Post 1613978)
The only symptom I can report is loss of smell. I am pretty much normal other than that.
I feel sorry for the virus for messing with me. |
Originally Posted by Joe Perez
(Post 1612968)
Today I learned:
The Samurai were officially abolished as a caste in Japanese society during the Meiji Restoration in 1867. The first ever fax machine, the "printing telegraph," was invented in 1843. And, of course, Abraham Lincoln was famously assassinated in 1865. Which means that there was a 22 year window during which, in theory, a Samurai could have sent a fax to Abraham Lincoln. Another weird/random thing I didn't know. |
This is one of the odder nuclear incident reports which I've read:
ACCESSION #: 9603120071 LICENSEE EVENT REPORT (LER) FACILITY NAME: SAN ONOFRE NUCLEAR GENERATING PAGE: 1 OF 3 STATION, UNITS 1, 2 AND 3 DOCKET NUMBER: 05000206 TITLE: DISCOVERY OF FOUR SLIGHTLY CONTAMINATED KITTENS AT SAN ONOFRE NUCLEAR GENERATING STATION EVENT DATE: 02/01/96 LER #: 96-001-00 REPORT DATE: 03/05/96 OTHER FACILITIES INVOLVED: SONGS UNIT 2 DOCKET NO: 05000361 SONGS UNIT 3 05000362 OPERATING MODE: 0 POWER LEVEL: 000 THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR SECTION: Other: VOLUNTARY REPORT LICENSEE CONTACT FOR THIS LER: NAME: R. W. Krieger, Vice President, TELEPHONE: (714) 368-6255 Nuclear Generation COMPONENT FAILURE DESCRIPTION: CAUSE: SYSTEM: COMPONENT: MANUFACTURER: REPORTABLE NPRDS: SUPPLEMENTAL REPORT EXPECTED: NO ABSTRACT: On 2/1/96, four kittens were discovered in a small space between office buildings inside the Unit 1 Protected Area/Restricted Area but outside the radiologically controlled area. As they were being taken out of the Protected Area/Restricted Area, contamination was detected on them by the exit portal monitors. The kittens were surveyed and each measured about 6000 counts per minute. Health Physics workers gave each kitten a warm bath and shampoo, which lowered the levels to about 1000 counts per minute. After the baths, Health Physics analyzed each kitten and found about one microcurie of activity, (primarily cesium 137, and small amounts of cesium 134 and cobalt 60). While the quantity of radioactive material found on and in the kittens is far below Nuclear Regulatory Commission (NRC) reporting requirements, Edison is voluntarily providing this report. After the kittens were found, the remains of an adult cat on Interstate 5 were sighted and recovered by a plant worker. Subsequent analysis of the cat found similar levels of activity as in the kittens. Based on the similarity of color between this adult cat and the kittens, the rarity of cats on-site, and the similar contamination in each case, Edison believes it likely the adult cat was the mother of the kittens. The kittens remain under the care of plant workers. A local veterinarian has described the kittens as very healthy. There have been over 500 requests from local residents, the general public, and plant workers who wish to adopt the kittens. Because of the very low quantities of activity involved, this occurrence did not affect the health or safety of plant workers or the public. END OF ABSTRACT TEXT PAGE 2 OF 3 DESCRIPTION OF THE EVENTS: Plant: San Onofre Nuclear Generating Station, Units 1, 2, and 3 Reactor Vendor: Combustion Engineering Discovery Date: February 1, 1996 Mode: Unit 1, Safestor Units 2 and 3, About 99% Power On February 1, 1996, four small black kittens were discovered in a small space between two Unit 1 administration buildings inside the Protected Area/Restricted Area but outside the radiologically controlled area. As the kittens were being taken out of the Protected Area/Restricted Area, contamination was detected on them by the exit portal monitors in our security building. Health Physics immediately responded and surveyed the kittens and the workers who handled them with a standard frisker. The results showed that none of the workers were contaminated, but each kitten measured about 6000 counts per minute. To reduce this activity, Health Physics workers gave each kitten a warm bath and shampoo, which lowered the levels to about 1000 counts per minute. After the baths, Health Physics analyzed each kitten and found about one microcurie of activity, primarily cesium 137, and small amounts of cesium 134 and cobalt 60. Since the initial evaluation, measured activity has steadily decreased. A local veterinarian, who has made several visits to the plant and provided the first recommended vaccinations, describes the kittens as very healthy. Presently, their living quarters, which includes a pen, bed, and toys, is in a room within the Unit 2/3 radiologically controlled area near the main entry station. They remain in the care of plant workers. The quantity of radioactive material found on and in the kittens is far below Nuclear Regulatory Commission (NRC) reporting requirements. Nevertheless, SCE has provided prompt and frequent updates to NRC resident and regional personnel and is voluntarily providing this Licensee Event Report. During an effort to find the kittens' mother, we learned that an animal control officer had caught an adult cat on Edison property just outside the Protected Area/Restricted Area near Unit 1, one day before the kittens were found. Because the cat was wet from a rainstorm and listless, the animal control officer took the cat home where it slept overnight in a cage in the officer's garage. The next morning, the cat appeared healthy and alert. Thus, consistent with our practice, the cat was released in a suitable area away from the plant. After the kittens were found, workers at the plant tried, without success, to find the adult cat in the area where it had been released. Health Physics then contacted the animal control officer who handled the cat and surveyed him, his vehicle, and his home. While no contamination was found in or on him or in his vehicle or home, trace levels of activity (a few nanocuries) were found on a rag he used to dry the cat, and in feces deposited in the cage. As the search continued, the remains of an adult cat on Interstate 5 were sighted and recovered by a plant worker. Health Physics analyzed the cat and found similar levels of activity as in the kittens. Based on the similarity of color between this adult cat and the kittens, the rarity of cats on-site, and the similar contamination in each case, Edison believes it likely the adult cat was the mother of the kittens. In an effort to find out how the kittens became contaminated, Health Physics performed a comprehensive survey both inside and outside the radiologically controlled area. While no contamination was found in either the area where the kittens were discovered or outside the radiologically controlled area, a few areas were identified inside Unit 1's radiologically controlled area where a small animal (like a cat) could gain access and become contaminated. These areas meet all the regulatory requirements for access control and precautionary procedures to restrict TEXT PAGE 3 OF 3 worker access. Nevertheless, to reduce the chance of a small animal entering these areas again, additional physical barriers will be installed, where practical. The kittens remain under the care of plant workers. There have been over 500 requests from local residents, the general public, and plant workers who wish to adopt the kittens. Because of the very low quantities of activity involved, this occurrence did not affect the health or safety of plant workers or the public. ADDITIONAL INFORMATION: A search of the LER files yielded no similar event in the last three years. ATTACHMENT TO 9603120071 PAGE 1 OF 1 SOUTHERN CALIFORNIA R. W. Krieger EDISON Vice President Nuclear Generation An EDISON INTERNATIONAL Company March 5, 1996 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D. C. 20555 Subject: Docket Nos. 50-206, 50-361 and 50-362 Voluntary Report Licensee Event Report No. 96-001 San Onofre Nuclear Generating Station, Units 1, 2 and 3 This submittal provides a voluntary report describing the discovery of four slightly contaminated kittens at San Onofre. Neither the health nor the safety of plant personnel or the public was affected by this occurrence. Sincerely, Enclosure: LER No. 96-001 *** END OF DOCUMENT *** Source: https://adamswebsearch2.nrc.gov/webS...ber=9603120071 |
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