Flat Plane Crankshafts


Comments • 647

  • Mark Richards
    Mark Richards  5 days back

    Very simple informative explanation

    • badad0166
      badad0166  7 days back

      Concise information delivered in a professional manner. Most satisfying Utube experience. Harumph.

      • V. E.
        V. E.  7 days back

        Sure can hear the Coyote Mustangs when they rev. Completely different than a standard cross plane V8 - angrier, perhaps. lol

        • Runkization
          Runkization  1 weeks back

          Do some cylinders underperforms in V4 and in Yamaha crossplane inline 4 too? Cause even these engines fire unevenly.

          • Grahame Rex
            Grahame Rex  1 weeks back

            Great explanation. I’m new to understating these mechanics. Recently purchased an Alfa Romeo Giulia which has a flat plane crank V6 at 90 degrees. I found your video very informative.

            • Sean Murkidjanian
              Sean Murkidjanian  1 weeks back

              The point that is missing from this technology other than performance is endurance. meaning pistons that fire off at the same area of aluminium block is sure to fail due to heat offset in the block as a whole. endurance of the bearing package of this engine will have failure where that bearing is hit twice per fire order. with regards to performance, you pedal a bike at 180 and two adjacent axis. get a bike for two and find peak performance and build your crankshaft around that. Now you understand when you have a feeling your mechanical counterpart goes through.

              • John Douglass
                John Douglass  2 weeks back

                This video was an outstanding informative and concise demonstration of the flat plane crank. Exactly what I was looking for. Great job!

                • 88SC
                  88SC  2 weeks back

                  Single plane crank. Or “flat” crank.

                  • Quiet Knight
                    Quiet Knight  3 weeks back

                    In what universe is a cross plane crank traditional?? You state yourself that the flat goes back to the earliest days of motoring, it seems to me that cross planes are found almost exclusively in higher end euro machines.

                    • Rock Fisher
                      Rock Fisher  3 weeks back

                      Its looks like a flat plane crank would get more vibration because it looks like a giant rocking couple (picture a bicycle crank) when in operation. Parallel twins get that, especially when the bores get bigger.

                      • Inazuma MR
                        Inazuma MR  3 weeks back

                        Thx - very cool explanation. Now I know how it really works

                        • M535
                          M535  3 weeks back

                          Better sound. No...

                          • Arno Kilianski
                            Arno Kilianski  3 weeks back

                            Related question: Are there any v-8 cars that use fork and blade connecting rods, like a Harley v-twin?

                            • Nippon Nostalgic TV
                              Nippon Nostalgic TV  3 weeks back

                              With cross plane cranks. Could you alter the exhaust runner length on the appropriate cylinder to prevent the pulses overlapping like in the animation? Also, cylinders with uneven performance, would there be any gains to be had to different cam profiles fine tuned for each cylinder to reduce this issue?

                              • Cyphrix101
                                Cyphrix101  3 weeks back

                                Flat-Plane or Cross-Plane, it doesn't matter to me. Long live the V8!

                                • Raspian Kiado
                                  Raspian Kiado  4 weeks back

                                  I'm planning on making a (viewed from the first crank, to the back) Y shaped Crank. Would it be worth it.

                                  • twl197860
                                    twl197860  1 months back

                                    Everyone forgets in the early 1900s everyone was using flat plane cranks even the model t had one as for a cross plane crank being more reliable that really depends on several factors and flat or cross plane crank isn't one of them . So tired of ppl using Google for their info go to school or actually read a book .

                                    • A Christian
                                      A Christian  1 months back

                                      Wow, they are using a Porsche design. All boxers use that crank. lol

                                      • Rick Murray
                                        Rick Murray  1 months back

                                        The secondary imbalance mentioned here was not explained. It's the same reason 4 cyl inline engines shake or buzz (depending on their size and mounting). In a flat plane crank V8, you have 2 4 cyl engines 90 degr from each other, both shaking. You don't see modern 4 cyl engines over 2.5 ltr that don't have balance shafts. The shake is just too much to put up with over that (the Porsche 3 ltr 924 engine has a balance shaft, for instance). This imbalance is the result of the fact that the pistons are accelerated differently at each end of the stroke. And that is because of rod angularity when the piston moves in a straight line and the big end of the rod moves in a circle. The point in the stroke at which the piston movement changes from accelerating to decelerating is when the rod center line is at right angles to a line between the rod bearing and the main bearing. That puts the piston a little higher than midpoint of its stroke. Longer rods reduce this effect (it affects breathing as well). So the piston has less distance to travel in its reversal of direction at the top of its stroke than it does at the bottom of the stroke. The big end has farther to travel during the lower swing. The piston reverses direction quicker at the top of the stroke than it does at the bottom. That means it changes direction quicker at the top than at the bottom. That difference in acceleration produces different forces at the top and the bottom as well. Remember F=MA? Force = mass x acceleration. The difference in force at the top and bottom is what causes the shake. "Balancing" the parts has nothing to do with it. It is a result in differences in acceleration. "Boxer" engines, by virtue of their opposed cylinders cancel these forces out.

                                        • BakerOne
                                          BakerOne  1 months back

                                          Superb explanation, thanks

                                          • EightFiveZero Braxton
                                            EightFiveZero Braxton  1 months back

                                            better explanation than engineering explained, I like the animations you did

                                            • Lefty16Vek
                                              Lefty16Vek  1 months back

                                              Great video like the explanation and the visuals

                                              • Colin Bremner
                                                Colin Bremner  1 months back

                                                Sadly electric engines yield this tech obsolete very soon

                                                • Rick Murray
                                                  Rick Murray  1 months back

                                                  Electrics are motors. That's what motor means. Internal combustion devices are engines. Using the term Motor referring to engines is popular, but technically not correct.

                                              • Colin Bremner
                                                Colin Bremner  1 months back

                                                You explain so nicely. What a clear mind and talent you have

                                                • lawyers9
                                                  lawyers9  1 months back

                                                  In reference to the flat plane shorter life span, just how much shorter?

                                                  • DukeDalington
                                                    DukeDalington  1 months back

                                                    Very interesting, thank you.

                                                    • Marko Uzelac
                                                      Marko Uzelac  2 months back

                                                      IT IS NOT NEW TECHNOLOGY!!!!

                                                      • Tj930
                                                        Tj930  2 months back

                                                        Great video

                                                        • Diesel Ramcharger
                                                          Diesel Ramcharger  2 months back

                                                          flat plane used in earliest cars. you then go to say more traditional cross plane. come on dude. direct contradiction not even 1 minute in.

                                                          • stefano ath
                                                            stefano ath  2 months back

                                                            Who care about roughness when you are on a race car

                                                            • Scott Weatherman
                                                              Scott Weatherman  2 months back

                                                              That is called a 180 degree crankshaft

                                                              • baden pobjoy
                                                                baden pobjoy  2 months back

                                                                VERY interesting ....thankyou

                                                                • sking0369
                                                                  sking0369  2 months back

                                                                  I'm wondering tho...... Couldn't the cam be disigned to fire the flat plane crank engine 1,2,5,6,3,4,7,8 instead of 1,2,3,4,5,6,7,8 as in your diagram? This wouldn't help the exhast flow problems but would seem to help NVH.

                                                                  • jgto17
                                                                    jgto17  2 months back

                                                                    Ever heard a 500 inch cross plane v8 at 11,000 rpm? No?! You should.

                                                                    • Crushmania
                                                                      Crushmania  2 months back

                                                                      so what's about vibration?

                                                                      • TurboDieselDan
                                                                        TurboDieselDan  2 months back

                                                                        Bummer that Ford had to make so many compromises with their flat plane crank and the reason why it doesn't sound and rev like a Ferrari. Motor Trend discusses this in their video which shines a light on the differences like Ford's use of cross plane style intake manifold design, cross plane exhaust design, a crank shaft that's closer in weight to a cross plane then a flat plane and subsequent non-Italian firing order.

                                                                        • jdr ok
                                                                          jdr ok  2 months back

                                                                          Well firing order isnt so easy to say. Given cylinder numbering differences.

                                                                      • ROFLWOFFL
                                                                        ROFLWOFFL  2 months back

                                                                        This was totally informative. Thank you very much!

                                                                        • Yellow Hammer
                                                                          Yellow Hammer  2 months back

                                                                          EXCELLENT EXPLANATION SIR. THANK YOU FOR THE EDUCATION!

                                                                          • Chris Carr
                                                                            Chris Carr  2 months back

                                                                            Does sound cool

                                                                            • AndreS123_03
                                                                              AndreS123_03  2 months back

                                                                              Low end torque production, you know, for getting work done. How's that?

                                                                              • David Hunt
                                                                                David Hunt  2 months back

                                                                                Since you don't know how to draw a flat plane crank (i.e. the counterweight) and v-configuration you definitely don't know what you're talking about! period.

                                                                                • WickedSickah
                                                                                  WickedSickah  3 months back

                                                                                  Love this video

                                                                                  • Knut Bjornlarsen
                                                                                    Knut Bjornlarsen  3 months back

                                                                                    Decades ago a friend of mine hijacked a billet crankshaft complete with wooden box to hold it, from a famous race team. Believe me if I said the name everyone would recognize. So we know this is a sweet piece, but what does it go in? It was a single plane crankshaft or so we through it made sense considering the source. When we took it to a crankshaft grinding shop there was a guy there that just glanced at it and said oh yeah that's a turbo offy crank we were blown away needless to say we didn't have a block for it to fit in or head or other pieces

                                                                                    • tankerboysabot
                                                                                      tankerboysabot  3 months back

                                                                                      So why not make a V10 flat plane?

                                                                                      • jdr ok
                                                                                        jdr ok  2 months back

                                                                                        Because what a v8 benefits from a v10 might honestly not. More pistons generally will solve a lot of balance issues and doesnt always suffer from the same issues as other engine configurations.

                                                                                    • Joey
                                                                                      Joey  3 months back

                                                                                      I like the "sound" of the LS!

                                                                                      • Big Red
                                                                                        Big Red  3 months back

                                                                                        In the motorcycle world, crossplane cranks for cylinder bikes seems to provide more reliability and higher engine revs up to 14,000 rpm's. Perhaps there are adavantages for fours not no avaiable to an eight.

                                                                                        • jdr ok
                                                                                          jdr ok  2 months back

                                                                                          The cylinder configuration and count will play huge roles.

                                                                                      • YY H
                                                                                        YY H  3 months back

                                                                                        yamaha's cp3 sounds just sweet

                                                                                        • tehsheik
                                                                                          tehsheik  3 months back

                                                                                          Flat plane advantage is not sound....a v8 that sounds like a 4 cyl doesnt sound good.