VocalNeal Posted March 21, 2020 Share Posted March 21, 2020 2 hours ago, taninthai said: What’s the cbr650 Rev to then ,it’s a replacement for Honda hornet and my hornet screams to 16,000rpm ???? Link to comment Share on other sites More sharing options...
Popular Post VocalNeal Posted March 21, 2020 Popular Post Share Posted March 21, 2020 56 minutes ago, papa al said: papa's 1st bike in 1967 was a 100cc twin. If I could only have one bike. 3 Link to comment Share on other sites More sharing options...
ktm jeff Posted March 21, 2020 Share Posted March 21, 2020 13 hours ago, taninthai said: What’s the cbr650 Rev to then ,it’s a replacement for Honda hornet and my hornet screams to 16,000rpm Only the Honda Hornet 250 would rev to 16K. The 250,s from Yamaha , Kawasaki , Suzuki would rev up to 20K. The Hornet 400 is 14K,and the 600 is 12K Link to comment Share on other sites More sharing options...
taninthai Posted March 21, 2020 Share Posted March 21, 2020 28 minutes ago, ktm jeff said: Only the Honda Hornet 250 would rev to 16K. The 250,s from Yamaha , Kawasaki , Suzuki would rev up to 20K. The Hornet 400 is 14K,and the 600 is 12K Yep my mistake that pic must be 250cc clocks the 600cc revs up to 13,000 rpm???? 1 Link to comment Share on other sites More sharing options...
ktm jeff Posted March 21, 2020 Share Posted March 21, 2020 (edited) ONLY ???? 13K. Thats still over 216 times PER SECOND. Up , stop . Down , stop. Round and round. Valves twitching open/close. A miracle these engines. Edited March 21, 2020 by ktm jeff 1 Link to comment Share on other sites More sharing options...
Happy Grumpy Posted March 22, 2020 Share Posted March 22, 2020 23 hours ago, ktm jeff said: ONLY ???? 13K. Thats still over 216 times PER SECOND. Up , stop . Down , stop. How many times does each cylinder go up, stop, down, stop, on a 4 stroke inline 4 engine at 13k rpm? Link to comment Share on other sites More sharing options...
papa al Posted March 22, 2020 Share Posted March 22, 2020 16 minutes ago, Happy Grumpy said: How many times does each cylinder go up, stop, down, stop, on a 4 stroke inline 4 engine at 13k rpm? Same as for a single. Depends on how long you run it. What! ; trick question. Cylinders don't go up & down. !! Ha ha . Good one. 1 1 Link to comment Share on other sites More sharing options...
Happy Grumpy Posted March 22, 2020 Share Posted March 22, 2020 Someone seems to think they do it 216 times a second. Link to comment Share on other sites More sharing options...
eisfeld Posted March 22, 2020 Share Posted March 22, 2020 33 minutes ago, Happy Grumpy said: Someone seems to think they do it 216 times a second. Assuming you ment piston and not cylinder then I'd also say a bit over 216 times per second. Doesn't matter how many cylinders or 2 stroke vs 4 stroke. A RPM is one round on the crankshaft which is one instance of "go up, stop, down, stop" for a given cylinder assuming it was all the way down at the start. Therefor at 13k rounds per minute you have 13000/60 rounds per second. Each cylinder does the exact same amount of RPM. What are you thinking then? 1 1 Link to comment Share on other sites More sharing options...
Happy Grumpy Posted March 22, 2020 Share Posted March 22, 2020 2 hours ago, Happy Grumpy said: How many times does each cylinder go up, stop, down, stop, on a 4 stroke inline 4 engine at 13k rpm? 38 minutes ago, eisfeld said: Doesn't matter how many cylinders or 2 stroke vs 4 stroke. A RPM is one round on the crankshaft which is one instance of "go up, stop, down, stop" for a given cylinder assuming it was all the way down at the start. Therefor at 13k rounds per minute you have 13000/60 rounds per second. Each cylinder does the exact same amount of RPM. What are you thinking then? I'm simply asking the question. A 4 stroke engine, with 4 pistons/cylinders.... and the crank RPM is 13rpm. Each of the 4 pistons are going up/down 13k per minute. So the total number of pistons going up/down on a 4 cyl engine in one minute is 52,000:.. 4 pistons each doing the up/down 13,000 per minute. That's what you're confirming? Or is it each of the 4 pistons fire once per revolution? 1 Link to comment Share on other sites More sharing options...
Popular Post Damrongsak Posted March 22, 2020 Author Popular Post Share Posted March 22, 2020 Each cylinder fires once every two revolutions on a 4-stroke. 4 strokes: suck stuff bang belch 4 1 Link to comment Share on other sites More sharing options...
papa al Posted March 23, 2020 Share Posted March 23, 2020 6 hours ago, Happy Grumpy said: Or is it each of the 4 pistons fire once per revolution? Ha ha. Another trick question. Pistons don't fire. Plugs and fuel do. This guy is good !! ???? 2 Link to comment Share on other sites More sharing options...
VocalNeal Posted March 23, 2020 Share Posted March 23, 2020 1 Link to comment Share on other sites More sharing options...
eisfeld Posted March 23, 2020 Share Posted March 23, 2020 9 hours ago, Happy Grumpy said: I'm simply asking the question. A 4 stroke engine, with 4 pistons/cylinders.... and the crank RPM is 13rpm. Each of the 4 pistons are going up/down 13k per minute. So the total number of pistons going up/down on a 4 cyl engine in one minute is 52,000:.. 4 pistons each doing the up/down 13,000 per minute. That's what you're confirming? Or is it each of the 4 pistons fire once per revolution? The question keeps changing and seems unclear to me. First it was about ups and downs, then about cylinders, then about how many times the plugs fire? 1 Link to comment Share on other sites More sharing options...
VocalNeal Posted March 23, 2020 Share Posted March 23, 2020 (edited) 35 minutes ago, eisfeld said: Or is it each of the 4 pistons fire once per revolution? On some engines the plug does fire every revolution, even on four stroke engines. It even has a name. Wasted spark design. https://en.wikipedia.org/wiki/Wasted_spark Happens of four cylinder bikes when there are only two coils. Edited March 23, 2020 by VocalNeal 1 Link to comment Share on other sites More sharing options...
Happy Grumpy Posted March 23, 2020 Share Posted March 23, 2020 9 hours ago, Damrongsak said: Each cylinder fires once every two revolutions on a 4-stroke. So 7,500 times per minute at 13,000 rpm. Link to comment Share on other sites More sharing options...
eisfeld Posted March 23, 2020 Share Posted March 23, 2020 35 minutes ago, Happy Grumpy said: So 7,500 times per minute at 13,000 rpm. Nope ???? @VocalNeal I think you misquoted me, that was the Grumpy who said that Link to comment Share on other sites More sharing options...
papa al Posted March 23, 2020 Share Posted March 23, 2020 1 hour ago, Happy Grumpy said: So 7,500 times per minute at 13,000 rpm. You sir are truly hilarious. papa bows to you. Bravo. Bravo. 1 Link to comment Share on other sites More sharing options...
OneMoreFarang Posted March 23, 2020 Share Posted March 23, 2020 4 hours ago, Happy Grumpy said: So 7,500 times per minute at 13,000 rpm. But with 4 cylinders that are 26,000 sparks per minute. Sounds somehow faster. ???? Link to comment Share on other sites More sharing options...
VocalNeal Posted March 23, 2020 Share Posted March 23, 2020 ^ lets not forget that the fuel injector(s) operates at the same frequency.???? 1 Link to comment Share on other sites More sharing options...
ktm jeff Posted March 23, 2020 Share Posted March 23, 2020 23 hours ago, Happy Grumpy said: How many times does each cylinder go up, stop, down, stop, on a 4 stroke inline 4 engine at 13k rpm? If the engine is doing 13K , then per rev , each piston , in each cylinder , goes both up and down per rev. So each piston goes down AND up ( or up AND down ) every rev. Link to comment Share on other sites More sharing options...
papa al Posted March 23, 2020 Share Posted March 23, 2020 ...so 7500 for 4-banger? 1 Link to comment Share on other sites More sharing options...
ktm jeff Posted March 23, 2020 Share Posted March 23, 2020 3 minutes ago, papa al said: ...so 7500 for 4-banger? No 1 Link to comment Share on other sites More sharing options...
ktm jeff Posted March 23, 2020 Share Posted March 23, 2020 (edited) Lets keep the question consistent. 4 cylinder. 4 stroke. Spark plug(s) fire on on each cylinders power stroke (per cylinder) only. Everyone happy so far ?. Edited March 23, 2020 by ktm jeff Link to comment Share on other sites More sharing options...
mike787 Posted March 23, 2020 Share Posted March 23, 2020 You need to buy this ASAP....ride like the speed of light...enjoy it....it would look great on you. 1 Link to comment Share on other sites More sharing options...
Damrongsak Posted March 23, 2020 Author Share Posted March 23, 2020 (edited) Buy two and start chariot racing. Edited March 23, 2020 by Damrongsak 1 Link to comment Share on other sites More sharing options...
ktm jeff Posted March 23, 2020 Share Posted March 23, 2020 A piston goes both up AND down every rev of the crank. No matter how many pistons the engine has. Single cylinder engine revving at 13000 = piston goes both up and down 13000 times per minute. Spark plug (non wasted type) fires 6500 times per minute per cylinder. Every downward power stroke. The 7500 figure does not relate to 13000 revs. (2x 7500 = 15000). On a 4 cylinder engine the spark plug(S) will be firing 26,000 times per minute (6500 times each). Link to comment Share on other sites More sharing options...
Popular Post Damrongsak Posted March 23, 2020 Author Popular Post Share Posted March 23, 2020 Now if you want to impress your friends and annoy the neighbors, you need a 500cc Honda NSR500 V4. At a leisurely 12,000 RPM, it could put out nearly 200 HP. Of course being a 2-stroke, it fired every revolution, so you get twice as much noise. Great noise/weight ratio. 4 1 Link to comment Share on other sites More sharing options...
OneMoreFarang Posted March 24, 2020 Share Posted March 24, 2020 9 hours ago, Damrongsak said: Buy two and start chariot racing. Wow! I never saw that one before. 1 Link to comment Share on other sites More sharing options...
gargamon Posted March 24, 2020 Share Posted March 24, 2020 On 3/21/2020 at 9:37 AM, papa al said: papa's 1st bike in 1967 was a 100cc Yamaha twin jet? My first bike too... Link to comment Share on other sites More sharing options...
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