HTTP/1.0 200 OK Cache-Control: private, must-revalidate Content-Type: text/html; charset=UTF-8 Date: Sun, 29 Nov 2020 13:28:29 GMT Expires: -1 Pragma: no-cache 大世界app客户端
  1. home
  2. how to
  3. engine
  4. What Is A Flat-Plane Crank?

What Is A Flat-Plane Crank?

In the world of 90-degree V8s, there are two basic crankshaft designs.

*Guest Actress in a Comedy Series: Tina Fey and Amy Poehler, “Saturday Night Live”
这一次,湖人队处境不错,而且不需要赶着去做什么事,给他们点时间,看看他们到底会怎样。用这样的防守质量他们很难进入季后赛,但是这并不是这个赛季的重点。
3. Kate Upton
潘通色彩研究所(Pantone Color Institute)的执行总监莱亚特丽斯·艾斯曼(Leatrice Eiseman)说:把这两种颜色组合起来反应出“一种令人慰籍的秩序感与和平感”,在这个全球动荡和缺乏安全感的时代,把这种感觉融入产品应该具有吸引力。它也暗示着,“我们”和“他们”之间没有界线。

Cross-plane cranks gets their name because when viewed along its axis from either end, the four crank journals are arranged at 90-degree intervals, making a +. The tradition V8 firing order used by GM, AMC, and Mopar (and most Ford OHV V8s if the cylinders were numbered similarly) is 1-8-4-3-6-5-7-2. With this firing order, the odd-numbered cylinders are on the driver side, the even-numbered cylinders are on the passenger side. Notice that the cylinders 8 and 4 fire 90 degrees apart and are on the same bank, just as 5 and 7 (which do the same). There are alternative firing orders, including the 4/7 swap, but none of them get rid of having two pairs of adjacent cylinders firing in succession, pulling an intake charge from the same corner of the intake. Having two consecutive exhaust firings on one bank is what helps give the rumble associated with American V8s, although it makes exhaust scavenging less efficient. It also means cross-plane crankshafts have to use large counterweights to properly balance the engine, helping to keep it from rocking up and down, while keeping rotational mass high, making for a slower-revving engine. The benefit is that it is smooth and helps mitigate second order vibrations (a vibration at twice the engine rpm).

Flat-plane cranks have two pairs of journals 180 degrees apart from each other, so when viewed from either end, they look—well, flat. Flat-plane V8s, no matter the firing order, will always alternate between banks. That makes for efficient exhaust scavenging without needing to have header primaries cross over from one bank to the other, as Ford did in the GT40 for the classic "bundle of snakes" exhaust. Flat-plane cranks don't require massive counterweights and consequently rev very quickly, although they tend to have a noticeable secondary vibration. The vibration is typically not an issue, as flat-plane-crank V8s are used almost exclusively in race applications or in exotic sports cars.

Crank Facts

她还表示,从较长期来看,另一个让她担心的“R”是“重置”(reset),她解释称,全球各地的货币和财政政策在回归正常之前还有很长的路要走。她补充称:“最终的重置是那些在全球各地都有必要实施的结构性改革。”

一站式服务竟如此折腾 郑州买卖二手房要跑12趟