The flat plane crank is just a configuration that gives alternate bank firing in a 90 deg V8 block -- other block designs use a different crankshaft configuration to get that same condition. Crank journals or crankpins, whatever you want to call them, these small devices attached to the crankshaft's big end bearings make the difference between a boxer and a flat motor.
Thank you for helping keep Eng-Tips Forums free from inappropriate posts.The Eng-Tips staff will check this out and take appropriate action. [1], Flat-plane cranks are used in V-configuration engines, generally with eight cylinders.[1]. The most common type of flat-six engine is the boxer-six engine, where each pair of opposed cylinders moves inwards and outwards at the same time. I'm glad there was at least some merit to the idea that was put in my head. FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers, "Schiefgehen wird, was schiefgehen kann" - das Murphygesetz. Maybe this unusual flat V8 has the right perfomance characteristics, but still sounds "traditional"? But the lack of torque below 3000rpm, and the spike in torque at that rpm, would not be suitable for most other vehicles. These characteristics result in low vibration for flat-six engines (as per straight-six engines), especially when compared with the imbalances that are present in V6 engines with a 90-degree bank angle. Are there any flat plane crank V8s which use a traditional flat plane crank without balancing weights? If I were to sell my Cobra, it would be so that I could buy a GT350. Yeah launch control is popular in drag racing. You want inertial torque and engine torque benefitting eachother. Super light components increase the horsepower and revolutions per minute for any engine in our total manufacturing scope. I strongly suspect the resulting sound is more a result of the unconventional "unequal-length 4-into-3-into-1 exhaust manifolds" than the crankpin arrangement itself. As a small, weird guy, I've always had a special affinity for small and weird engines. Is there really? I think the GT350 is a great car. The crossplane crankshaft is used in most every production V8 sold in America today.On a crossplane crank, the four crank journals are arranged at 90-degree intervals (see image at left).
Click Here to join Eng-Tips and talk with other members! I've heard it argued, though not with back to back data or numerical analysis, that more rotating inertia can reduce 1/4 mile times, assuming a given launch rpm (and, I suppose, that the extra stored energy at launch goes into acceleration, rather than tire smoke or clutch heating). - it may not be a secret. If somebody attempted to install it in their garage, the wiring might be intuitive, or worse, easy to work on :p. With questions like this about why a certain crankshaft layout is chosen and similar questions - why not just ask Ford? For this reason, it remains useful in sports and racing cars. The SCG customers can now order a V8 engine that sounds and performs like a Ferrari at a fraction of the cost. That can get loud, too. ~ Joseph Stalin. [...] Your High Performance Headquarters SCAT Crankshafts is a true pioneer & leader in ingenuity, design & innovation. No stinking energy conserving going on here! Thanks for reply Melo , I was wondering if the V6 engine of the Dino and the 1960 Mondial 4 cylinder race car had flat plane crank shaft as well ? Flat-plane cranks have two pairs of journals 180 degrees apart from each other, so when viewed from either end, they look—well, flat. But spinning those parts up to that higher speed requires higher amounts of inertial torque.
http://www.mustang6g.com/forums/attachment.php?att... http://www.mustang6g.com/forums/showthread.php?t=1... http://www.uucmotorwerks.com/flywheel/LWF_DRAG_TES... http://www.caranddriver.com/flipbook/17-reasons-th... http://files.engineering.com/getfile.aspx?folder=067f610d-8782-40ca-baab-0f, Solutions Brief - Protecting and Rescuing On-Ground Personnel, White Paper - Cobots vs Covid: Today's Manufacturing Reality and Tomorrow's New Normal, Datasheet - Creo Generative Topology Optimization Extension. That is true, but there are more factors at play here. And I'm sure there's some shrieking of the driver as he or she realizes this big V8 is revving up like a sportbike engine or something. Flat-Plane V8s are commonly only used in high-performance engines, such as the likes of Ferrari. The benefit of using inertial torque on launches is that it is constructive to the engines peak torque output, which means more energy to get the car up to speed, which means the car gets into the power band faster. To this assertion, "...The rpm for peak torque bears no relationship to the rpm for peak power...", I'll make this reply: It's a lot like 4 cylinder engines that do not feature balance shafts - typically pretty smooth up to about 2 liters but get progressively rougher as displacement is increased much beyond that. Interested in our work? A racing engine that's light, small, and revs to ungodly numbers is far more important than one that has a bit of the shakes. A boxer-style flat-six engine is able to have perfect primary and secondary balance. Hence, the name crossplane.Using the traditional V8 firing order of GM, AMC, Mopar, and most Ford OHV V8s (1-8-4-3-6-5-7-2), a cross plane crankshaft will pro… The higher RPM you launch at, the faster all of the parts in the drivetrain will spin for that inertial torque to be transmitted. For the purposes of this quick explainer (there's much more detailed information available, of course) we won't go too deep into the details, but suffice it to say that a flat-plane V8 can generate a significant amount of vibration, especially on large displacement engines. Thank you for producing yet another World-first crankshaft for our World Championship winning Sprintec Sprint Boat! Nothing makes you appreciate simple cars quite like owning a complex one for long periods of time. I remain skeptical until I see the data or analysis. A flat-plane engine can also scavenge exhaust from the cylinders in a more efficient way, which offers performance and efficiency boosts as well, with less complex exhaust manifolds.
If its breathing is adequate for that then there is no reason to shoot for less hp. A voodoo swap is a highly advisable investment though.
Rapidly explore innovative design options to reduce development time and expense, all within the Creo design environment. I am starting to suspect it was down to machining/production capabilities. Gruntguru, ".....Shifting should be performed so that the average power output is maximised for the period spent in each gear. Launches are the period of time when engine speed, wheel speed, and vehicle speed are being coupled. Everything you need to know about and expect during, the most important election of our lifetimes, ADabOfOppo; Gone Plaid (Instructables Can Be Confusable), surprisingly well-balanced 3-cylinder engine. By definition therefore, you can't have a cross plane crank in a 6. Flatplane crank engines lose much higher amounts of rotational torque by the time the engine speed falls to peak torque RPM. Seems most plausible. Send us an email and we'll get back to you, asap.
Owning a simple car and developing it into what YOU want can have benefits. But, you can't sell a thoroughbread road race car to the general public very well, and/or a good chunk of Mustang customer base. The smaller frontal area compared with a radial engine also results in less drag. Flat-plane cranks have two pairs of journals 180 degrees apart from each other, so when viewed from either end, they look—well, flat. I do not understand exactly why that is said. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. The rotating assembly is designed as a single unit to reduce the feared resonant frequencies and irritating vibrations. IRStuff, I thought my OP highlighted what I saw as the disadvantages clearly enough.