Asimo Posted August 13, 2022 Share Posted August 13, 2022 V8 2-stroke in a Volvo. (Mercury outboard) https://www.carexpert.com.au/car-news/this-v8-volvo-uses-a-two-stroke-home-made-boat-engine-and-it-sounds-nuts Lacquer Peel, Rustybullethole, CreepingJesus and 1 other 4 Link to comment Share on other sites More sharing options...
Zelandeth Posted August 13, 2022 Share Posted August 13, 2022 Have to admit I'd love to do something silly with a little three cylinder Detroit. They just sound *angry* little buggers. Rustybullethole and Lacquer Peel 2 Link to comment Share on other sites More sharing options...
Richard_FM Posted August 13, 2022 Share Posted August 13, 2022 5 hours ago, HMC said: IIRC Porsche had a go at that configuration with their sports car racing program in the 60s. Some really interesting ideas with experimental materials, and for a relatively small company at the time, it got very expensive for them. The peak of this was probably the assembly of the 25 917s in 1969 for homologation where the 911 line virtually ground to a halt and even admin staff were on the shop floor assembling racing cars. IIRC that beast was a flat 12 that was basically 2 flat 6s joined up, and in original form would blow up if you slightly over revved it. I heard Porsche were close to bankruptcy when they had to show all 25 917s in a line for officials, as none could be sold or raced until they mast muster. I had though the flat 12 was in effect a 180 degree V12 as all cylinders fired one at a time rather than 2 like many other flat engines. The Ferrari flat 12s were also 180 degree Vs. Link to comment Share on other sites More sharing options...
New POD Posted August 13, 2022 Share Posted August 13, 2022 On 12/08/2022 at 12:25, Spurious said: They weren't much better when BMW took them over. I'd like to know how much money BMW pumped into Rover to stop them from going under. They literally had not got much to show for themselves. The 200/25 was dated by the time Ford came out with the Focus and should have been binned for something new then. They were selling the Metro for two years after the Ka came out. Whole thing wasn't worth saving save for the 75 and the Mini. But they didn't have a good car for the important small/medium hatchback and supermini segment. Which is where the sales are and money to be made. No surprise it was split up by BMW, BMW kept the Mini and sold off the rest to whomever would buy it. Smart move as Rover probably would have dragged BMW down with it. Dont get the rose tinted glasses with Rover. They'd some clever designs but dreadful business practice. For a time, when BMW owned Rover, did they also own Land Rover. Did they get the knowledge of how to build 4x4 systems? Would the X5 have been produced if they didn't have help? Also, when Land Rover was sold to Ford? Had the Range Rover been developed with a BMW engine, this commiting Ford to buying engines off BMW. Especially as it costs Billions to change chassis design to cope with a different engine. About that time BMW also owned BMW aerospace, near Berlin, which made small jet engines. They sold the whole lot to Rolls Royce, who factored into the deal the rights to use the Rolls Royce name to make cars, Thus screwing up VW when they bought Crewe and found they hadn't bought RR but Bentley. Link to comment Share on other sites More sharing options...
quicksilver Posted August 13, 2022 Share Posted August 13, 2022 How about a five-bank W30? Sounds crazy but Chrysler made such a thing to use in tanks by grafting five straight-sixes together! https://en.wikipedia.org/wiki/Chrysler_A57_multibank bunglebus, Lacquer Peel and Rustybullethole 2 1 Link to comment Share on other sites More sharing options...
Rusty Pelican Posted August 13, 2022 Share Posted August 13, 2022 There was a 5 stroke engine concept in 2000 , development work was carried out by Ilmor engineering - a company i have dealings with , not sure how fars its got Lacquer Peel and PhilA 2 Link to comment Share on other sites More sharing options...
CreepingJesus Posted August 14, 2022 Share Posted August 14, 2022 I was going to go and find the V8 Evinrude Volvo to post, cos it answered a long standing question for me, when I saw it: Performance Bikes late, great 'technical madman' John Robinson had built a 1,000cc stroker V-twin out of two Honda CR500 engines; I'd been idly playing with a couple of CR250 barrels on a mate's bench round about then, and wondered if the really neat packaging and tidy footprint could be used to some advantage. V8 maybe? And why stop at 250cc per pot? 8 x 500 = 4,000! 4 litre V8 stroker? Sounds fine to me... And it does, if the Evinrude Volvo is anything to go by. Split singles always sound odd, I think. Almost like a twin, but not somehow. Link to comment Share on other sites More sharing options...
martc Posted August 14, 2022 Share Posted August 14, 2022 17 hours ago, Rustybullethole said: Yes of course! Wonder if you can still get the rings for them 🤔 Yes, yes you can! A mere E511 for a set of 2 rings + E87.50 for an oil scrapper, price per piston. (for the curious E = euro, old keyboard don't you know) https://www.cmsnl.com/honda-nr750-1992-n-england_model3529/partslist/E__1300.html Incidently, would they be better called rectangles rather than rings? Rustybullethole, CreepingJesus, twosmoke300 and 1 other 3 1 Link to comment Share on other sites More sharing options...
PhilA Posted August 14, 2022 Share Posted August 14, 2022 13 hours ago, Rusty Pelican said: There was a 5 stroke engine concept in 2000 , development work was carried out by Ilmor engineering - a company i have dealings with , not sure how fars its got Another case of old tech making full circle- steam engines make good use of this principle. That's not bad thermal efficacy though. Link to comment Share on other sites More sharing options...
horriblemercedes Posted August 14, 2022 Share Posted August 14, 2022 22 hours ago, quicksilver said: I suggested a KW12 in the BS facts thread a while ago, using the two KV6s side-by-side instead for potential quadruple OMGHGF. Couldn't you say that about any four head engine? KV6 doesn't have a particular reputation for head gasket failure Link to comment Share on other sites More sharing options...
sheffcortinacentre Posted August 14, 2022 Share Posted August 14, 2022 On 8/13/2022 at 11:06 AM, Zelandeth said: Well not quite, but Oldsmobile did make a diesel V8...which was plagued by problems because they basically did just stick a diesel head and pistons in their existing petrol block. Stretched/snapped head bolts were a recurring issue that dogged it for its relatively short production run. The noise at idle is truly bizarre... especially in a car rather than a big pickup truck or commercial where V configuration diesels are more common over there. If we're talking about the GM diesel V8 of the late 70's then that was based on the 350ci (5.7) cast iron engine not the early 60's 215 ci (3.5) aluminium engine . Most of the problems where due to the block not being able to cope with the far higher compression ratio required by a diesel. Link to comment Share on other sites More sharing options...
CreepingJesus Posted August 14, 2022 Share Posted August 14, 2022 I'm genuinely surprised engine parts are available for the NR750: being the most expensive production bike at the time (and eclipsing the Bimota Tesi on that honour by some margin), I wouldn't have expected any of the few made to have racked up enough mileage to need them. But then, that 750 wasn't Honda's first try at non round piston engines - they'd been doing it on and off since the mid 70s iirc, although the previous efforts were 500cc racers, if I am right. All of them ended up museum/collector pieces in the end. martc 1 Link to comment Share on other sites More sharing options...
bunglebus Posted August 15, 2022 Share Posted August 15, 2022 21 hours ago, martc said: Incidently, would they be better called rectangles rather than rings? I believe that shape is referred to as a stadium martc 1 Link to comment Share on other sites More sharing options...
martc Posted August 15, 2022 Share Posted August 15, 2022 1 hour ago, bunglebus said: I believe that shape is referred to as a stadium Stadium is a good word for them - much better than rectangle. Perhaps 'quartic' as an alternative? Rustybullethole 1 Link to comment Share on other sites More sharing options...
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