w********2
发帖数: 632 | 1 An air-cooled rotary that powered a number of successful World War I
aircraft
History
The rotary engine is unique in that, unlike fixed radial engines, it has a
stationary crankshaft bolted to the firewall, with everything else (
cylinders, crankcase, propeller) all rotating. The rotary in its original
form is extinct, with the term now being used to describe "Wankel" rotary
combustion engines such as those built by Mazda. Though automotive and
motorcycle rotaries were built in the United State... 阅读全帖 |
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t**********3
发帖数: 12623 | 2 http://en.wikipedia.org/wiki/Crankcase_ventilation_system#Posit
Positive crankcase ventilation (PCV)
During World War II, however, a different type of crankcase ventilation had
to be invented to allow tank engines to operate during deep fording
operations, where the normal draft tube ventilator would have allowed water
to enter the crankcase and destroy the engine.[3] The PCV system and its
control valve were invented to meet this need, but no need for it on
automobiles was recognised.
In 1952, ... 阅读全帖 |
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f**********n
发帖数: 3081 | 3 PCV, stands for positive crankcase ventilation. Since the piston rings
cannot stop every bit of combustion gases from escaping past them into the
crankcase(oil pan) area, there needs to be some way to safely vent that
pressure, so that it wont build up and blow the seals out of the engine. The
PCV valve does this, by applying a controlled amount of vacuum to give the
combustion gases a way out and keep them from building up.
EGR stands for exaust gas recirculation. The EGR valve opens at the
app... 阅读全帖 |
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m**s
发帖数: 221 | 4 哦，讲有毛病就是讲大毛病，发动机，transmission，Steering，Braking之类。
你以为换的电池灯泡啥的人家有法子统计么？
随便查查 MSN Auto 上bmw 3 2006的问题：
Engine
Moderate Problems
An occasional problem on this vehicle is failure of the Crankcase
Ventilation Valve. The cost to repair the Crankcase Ventilation Valve is
estimated at $54.00 for parts, $247.00 for labor. All prices are estimates
based on $65.00 per flat rate hour and do not include diagnostic time or any
applicable sales tax.
Transmission & Driveline
Minimal Problems
Infrequent probl... 阅读全帖 |
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B*Z
发帖数: 7062 | 5 The 10 Best Engines of the 20th Century
Don Sherman | WardsAuto
Jan 1, 2000
It took a century for automotive engines to mature from cantankerous
contraptions to the smooth, reliable machinery that currently enables our
mobility. The following honor roll celebrates the 10 best - those engines
that motored far beyond the call of duty to advance the internal-combustion
cause.
Ford Motor Co. Model T Inline-4 (1909) After eight lackluster designs, Henry
Ford finally hit paydirt with his 1909 Model T.... 阅读全帖 |
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a***n
发帖数: 5665 | 6 【 以下文字转载自 AutoFans 讨论区 】
发信人: EXXON (不限), 信区: Saab
标 题: Re: Bimmer Cyclone Separator 图
发信站: BBS 未名空间站 (Thu Mar 29 17:11:34 2007)
Could be the PCV system blockage. However, I highly suspect it's because of
the aging of the cover gasket rather than high crankcase pressure. Because
if it's the later, you will mostly get leaking from shaft seals rather than
cover gasket.
One easy way to check if you have higher than normal crankcase pressure is
to remove the oil dipstick while engine is running. Y |
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m****o
发帖数: 41 | 7 Agree, but the engine is actually composed of 4 cast-iron (steel)
cylinders and an Al crankcase.
they |
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h*******r
发帖数: 847 | 8 最纯粹的技术帖：汽车术语 中英文对照
汽车之家 日期：9/7/2005 点击：1664
http://club.autohome.com.cn/050922/27357.html
原帖：汽车术语- 中英文对照
引擎系统(Automotive Engine System)
燃烧室(Combustion Chamber)
活塞到达上死点后其顶部与汽缸盖之间的空间，燃料即在此室燃烧。
压缩比(Compression Ratio)
活塞在下死点的汽缸之总容积除以活塞在上死点的总容积(燃烧室容积)，所得的值就称为
压缩比。
连杆(Connecting Rod)
引擎中连接曲轴与活塞的连接杆。
冷却系统(Cooling System)
可藉冷却剂的循环，将多余的热量移出引擎，以防止过热的系统。在水冷式的引擎中，包
括水套、水泵、水箱及节温器。
曲轴箱(Crankcase)
引擎下部，为曲轴运转的地方，包括汽缸体的下部和油底壳。
曲轴(Crankshaft)
引擎的主要旋转机件，装上连杆后，可承接连杆的上下(往复)运动变成循环(旋转)运动。
曲轴齿轮(Cr |
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t********6
发帖数: 163 | 9 your burning smell could be well related to your PCV crack if it is located
somewhere above your CAT or exhause pipe. (PCV leaks engine oil onto your
hot CAT or exhaust)
If PCV is not in that area, it could be one of your gasket (most likely VCG
valve cover gasket) is leaking oil onto CAT or exhaust.
clogged PCV system often cause leaking VCG (because pressure building in the
crankcase). be sure to check it after you fix your PCV. (you need to not
only replace the leakage elbow but also the valv |
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t**l
发帖数: 577 | 10 DIY timing belt的话题在版上零零散散，对大牛来说啥当然都是小菜，对一般DIY来说
因为看法不一总是难以决断是否应该DIY。teil在月前闲暇实在手痒，DIY了大俗车
Accord，手记带图给大家做个参考。 侧重点在于提供网上不是很容易查到的第一手信息
首先作为总结，teil花了大概1天半时间，主要是因为中间漏买工具出了点差错，感觉
你要觉得DIY是自己的一个爱好，的确乐在其中，不妨一做，没想象那么困难。否则还
是送车铺算了。 另：更换过程发现上次换timing belt的车铺给忘放了两个密封圈/垫
，当然是小问题。
内容包括 timing belt和balancer belt (Accord是两条带）, water pump, 两个
tensioner, 两个tensioner 弹簧，顺便做了 valve clearance adjustment和valve
cover gasket/SP grommet (of course)，换了外面的两条V-belt.
1. 材料和工具采购
先说配件采购问题，
IMG_3269.JPG
照片1是引擎上拆出来的东西（valve co... 阅读全帖 |
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s*******n
发帖数: 452 | 11 What Goes Wrong With Cars, and When
By Larry Carley c2009
Owning and driving a car involves two things most motorists would rather
avoid: spending money on maintenance and spending money on repairs.
If you do not maintain your car (meaning regular oil changes, filter
replacements and keeping an eye on critical fluid levels), you will be faced
with major repairs much sooner than you should. Most people realize a car
is an investment, and to get the most out of your investment you have to
take car... 阅读全帖 |
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k**********i
发帖数: 8706 | 12 不知道我的理解对不对
如果Seafoam这样的fuel/oil additive
加入油箱当中，主要起的作用是清洁fuel injector和combustion chambers
打开vacuum line(或者throttle gate)往里灌，主要的作用是清洁combustion chamber
s和throttle body
而且还可以加到机油engine oil里面，主要是清洁crankcase ? 是不是理论上用去污力
比较强的机油比如Mobil 1，就不用往机油里再加什么添加剂了？ |
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s*****n
发帖数: 134 | 13 【 以下文字转载自 Auto_Fans 俱乐部 】
发信人: seankun (kun), 信区: Auto_Fans
标 题: 换火花塞, PCV valve清Throttle Body，MPG反而降了
发信站: BBS 未名空间站 (Thu Jul 12 15:44:41 2012, 美东)
04年的Taurus, 24valve DOHC 3.0L Duratec发动机，从dealer哪里买来开了两万麦到
了100K。之前自己换过前刹车片，自信心过度膨胀，于是想DIY 100K tune up. 因为是
V6发动机，前三个火花塞很好拆，后三个需要拆Upper Intake Manifold，对其难度估
计过低。
按照保养手册上的指示要换的几样东西就是火花塞，PCV(positive crankcase
ventilation) valve，有必要的话可以把Upper Intake Manifold的垫圈也换了。零件
在Rockauto上买的，感觉比Amazon 和 Autozone都要便宜一点，倒是工具前前后后跑了
好几趟Zone，共计有spark plug socket, e... 阅读全帖 |
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i****x
发帖数: 17565 | 14 PCV valve其实就是个单向阀，油污多了黏住开闭不顺，会造成crankcase内压增高，把
机油压进气缸去，原理就这么简单。从原理上讲，那根管子只要没有堵住一大半，就不
应该有影响。不过这只是纯理论分析。。。等dsb或三哥来讲解具体修理经验 |
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m***o
发帖数: 55 | 15 04 Honda Pilot 90K. Timing Belt Due.
地 雷 说 ： T-Belt + Water Pump + Seals $700 plus tax
但 是 我 想 找 LOCAL MECHANIC (Only Charge for Labor), 这 样可 做 如 下 ITEM:
1. T-Belt + Water Pump + Seals
2. Hydraulic Tensioner (is it necessary?)
3. 2 drive belt.
4. Side engine mount (need to remove anyway)
不 算 Tensioner 他 要 $300。 OEM Parts $260. 可 能 我 还 要 买 个 Crankcase
Pulley Holder ($20). 怕 他 万 一 没 有 而 用 其 他 方 法 下 PULLEY BOLT。
看 了 一 遍 SERVICE MANUAL，没 发 现 特 别 的 地 方 FOR PILOT，除 了 一 些
关 于 High Interference Engin... 阅读全帖 |
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l********i
发帖数: 8858 | 16 vcg 有没有漏很好检查 看看火花塞有没有机油即可
Crankshaft Seal 也可能漏机油
原罪可能 pcv堵了造成crankcase over pressure
所以说最好就是买个vented oil filler cap... 这样pcv堵了 也不会把vcg搞挂 |
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l********i
发帖数: 8858 | 17 高速跑得多的话 不容易烧机油 其实就是部分德国车intake到crankcase pcv/breather
系统设计的不好 |
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w********r
发帖数: 14958 | 18 如果你这不是坑， 我建议你检查crankcase ventilation valve. |
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a*******a
发帖数: 4212 | 19 Check this page out:
http://answers.edmunds.com/question-2012-Subaru-Outback-3-6-is-
I would have the dealer check the Positive Crankcase Ventilation system.
Also be sure to record on the repair orders at the dealership the nature of
your complaint and the level of oil consumption. Make sure the repair order
is dated and that the mileage on your car is recorded.
If there is an engine problem, this can be determined by a Cylinder Leakdown
Test.
The dealer may tell you that this level of consumpti... 阅读全帖 |
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g********d
发帖数: 19244 | 20 可能是 crankcase ventilation hose
不影响点火 |
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g********d
发帖数: 19244 | 21 ☆─────────────────────────────────────☆
felixcat (felixcat) 于 (Thu May 9 13:40:40 2013, 美东) 提到:
其实有个症状之前已经偶然出现过好几回。这个症状就是135i停在路上，发动机在怠速
的时候，发动机转速会突然在600到1000转之间窜来窜去（怠速不稳），并且车子有比
较强烈的振动，让人感觉好像是发动机频临死火，但又挣扎着不想死火那样。
因为不是持续出现这种现象，很难reproduce出来，所以我之前把它归咎于这车子的发
动机和ECU是调教得比较运动化，比较粗野的风格而已。
结果前天开车上班路上，在一个路口等红灯的时候，这症状又冒出来了；但这回把我吓
到的是，因为路对面是一片树林，有了这绿色的背景，我很清楚看到我车子的发动机盖
子下面正在冒出一缕缕白烟。好在那天还没看到坛子上的那个328起火自燃的帖子，不
然我当时肯定要跳出车子了。
因为情况没继续变严重，后来变绿灯我就开车走了，车子开起来这些症状就感觉不到了
。后来到停车场停好车，发动机怠速好像不那么抖了，但白烟还是在冒。我仔细查看了
... 阅读全帖 |
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y****i
发帖数: 778 | 22 http://www.motortrend.com/cars/2010/toyota/corolla/recalls/
Make sure you did all recall services before.
Recall ID # 67843 - SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM
TOYOTA IS RECALLING CERTAIN MODEL YEAR 2008-2009 SCION XD AND MY 2009-2010
COROLLA, AND COROLLA MATRIX VEHICLES EQUIPPED WITH 1.8L ENGINE AND
ORIGINALLY SOLD IN OR CURRENTLY REGISTERED IN THE STATES OF ALASKA, COLORADO
, IDAHO, ILLINOIS, IOWA, KANSAS, MAINE, MICHIGAN, MINNESOTA, MONTANA,
NEBRASKA, NEVADA, NEW HAMPSHIRE,... 阅读全帖 |
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x*b
发帖数: 5723 | 23 减重实在太牛了，比E46 M3还要轻!! 这性能绝对同级别再次无争议的标杆!
ENGINE
Inline 6 cylinder engine with two mono-scroll turbochargers◦Direct
Injection
VALVETRONIC
Double-VANOS
closed-decked crankcase
twin-wire arc-spray coating (instead of liners) in cylinder bores reduce
engine weight
430 HP (approximately)
369+ LB-FT (500 Nm)
Higher than 7500 RPM redline
WEIGHT
Under 3,306 lb (1500kg) weight (no mention if this is curb weight and no
specifics provided as to what equipment included/not included in figure)
compare to... 阅读全帖 |
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E*********o
发帖数: 5965 | 24 转一个：
铸铁发动机，我也说两句 （日本车托看完后闭嘴吧，别老拿全铝发动机说事）
实在看不下去了，一群开着日车的小样如此得瑟。。。。
以下是我在wikipedia.com上原文粘贴下来的，关于EA888发动机的技术参数。
EA888
160 hp (119 kW) - 170 hp (127 kW) 1.8 TFSI I4
Configuration
1798 cc water cooled inline 4, bore 82.5 mm/stroke 84.1 mm
Head
9.6:1 compression ratio, toothed chain driven camshaft, continuous adjusting
intake
Block
88 mm cylinder spacing, 33 kg grey cast iron (GJL 250) <----------看见了吗？
33千克灰铸铁 （GJL 250）
Crankcase
two toothed chain driven counter-rotating balancing shafts suppressin... 阅读全帖 |
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x*b
发帖数: 5723 | 25 这颗S55机头比BMW普通的N字头3.0T还是好不少啊，走的和M838T类似的路线。貌似没人
说M838T的不好啊。
S55 Engine / Exhaust
•3.0L inline 6 cylinder Twin Turbo engine
•2,979 cc
•Stroke/Bore: 89.6mm / 84.0mm
•425 HP from 5500-7300 RPM
•406 LB-FT torque from 1850-5500 RPM
•0-60 MPH: 3.9 seconds (DCT) / 4.1 seconds (manual)
•7600 RPM rev limiter
•10.2:1 compression ratio
•Top Speed: 155 MPH / 250 KMH
•Nearly 25% fuel consumption and emissions reduction over E90/E92 M3
•22 pound... 阅读全帖 |
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B*Z
发帖数: 7062 | 26 positive crankcase valve |
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B*Z
发帖数: 7062 | 27 是高速的时候intake manifold的真空变多，压力会变小吧。crankcase里面会有什么压
力？ |
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B*Z
发帖数: 7062 | 28 这个不是少机油。是blowby 的gas跑到crankcase里面遇热挥发出来。更像是汽油和机
油混合气体。你要想实验，下次用火柴点一下。我可不负责任：) |
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a******o
发帖数: 16625 | 29 我觉得轻松能装进去。整个crankcase里面大概都是油了。 |
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B*Z
发帖数: 7062 | 30 pcv是从crankcase出去的，能有几个气。不如egr靠谱。 |
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b**********r
发帖数: 317 | 31 看了woyeye和casual两位的帖子，感觉比较贴近现实。我的这台X5 也开了有6年多了，
从最开始的换灯泡开始，一路自己买工具，看教程，捉摸修，感觉很多设计还是为后期
的维护考虑的，只不过很多需要专用工具，Bolt Torque自己到TIS上查。换过Valve
Cover Gasket, CCV, Spark Plugs, Tensioner, Idler Pulley, V-Belt, A/C Belt,
Window Regulators (2X), Crankcase Positioning Sensor, Brake Pads & Rotors (
4X), Lower&Thrust Control Arms, Drive Axle, Struts & Shock Absorbers, HID
Conversion (w/ Projector).
暂时能想起来的就这么多。其他的像换油之类的就不赘述了，想必大家也都动手能力很
强。总体感觉一点：大毛病没有，小毛病不断。所以只要有时间，有工具，加点儿机械
常识，我感觉版上绝大多数人都可以做到这些。
下附几张今早刚完工的一个小Jo... 阅读全帖 |
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m*******e
发帖数: 1569 | 32 不久前见过这warning, 拿去dealer说是crankcase vent什么的裂了，讲是小问题，但
nm开起来真是有点提心吊胆，抖得不行，德国车过了warranty还是果断trade in
[在 LZSM (LZSM) 的大作中提到：]
：大半年前的事啦 车刚出保半年 晚上回家一发动车就就弹出个画面说是“引擎不能发
挥最大马力工作 需联系Dealer”
：当时就觉得不妙高速并线超车时是比之前肉多了，结果在家门口5分钟路程的一个路口
：........... |
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k***e
发帖数: 1931 | 33 收到Audi的通知，要求去dealer装一个crankcase pressure regulating valve，这个
装了对车有什么影响吗比如说影响马力什么的？ |
|
f****o
发帖数: 4067 | 34 我上面说这个就是被媒体忽悠，或者忽悠别人的。 机油在crankcases里面转悠，人家
能给你流到汽缸里和进出气道去顺便清理积碳，太先进了，绝对牛逼。 |
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B*Z
发帖数: 7062 | 35 就是大众只适合轻负载的工况。那整天吹牛1500rpm就max了扭矩岂不是坑人么，哈哈。
这就是典型的crankcase 压力处理不行。pcv系统太差。发动机设计101考试不及格。
autobahn |
|
n***s
发帖数: 10056 | 36 不好的news。head gasket可能漏了。
你以前有没有做过PCV管路/阀的清洗？ 如果没有，做一下。PCV堵了或PCV 阀坏了，会
增加 crankcase 压力。导致head gasket 漏。 PCV通后可能会不漏了。
以上的前提是你从车底没有看到明显的漏coolant的地方。 |
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m****a
发帖数: 2593 | 37 If you move to more late model stuff, the situation gets a bit more dire.
Let’s take the E46 M3, for example. It featured a 333-horsepower naturally
aspirated inline six cylinder engine that was more unreliable than an AA
meeting sponsored by Miller Lite. These engines were were plagued with
connecting rod bearing failures, issues with the variable cam timing (VANOS)
, crankcase ventilation failures, hard starting, and their cooling systems
were made of plastic and sealed, ensuring catastrophic ... 阅读全帖 |
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M*******r
发帖数: 551 | 38 这是 home depot 的答复. 大家看该怎么做？
Your question has been answered!
Your questions are very important to us and the Home Depot community. Thank
you for taking the time to ask a question about 24 in. Two-Stage Electric
Start Gas Snow Blower.
YOUR QUESTION
I recently bought the SNO-TEK 24 inch from home depot. The unit was already
assembled when I made the purchase. A guy from home depot and myself loaded
the unit into my SUV. In order to fit the SUV, we had to let the machine lie
on its side (not rememb... 阅读全帖 |
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i***e
发帖数: 9429 | 39 furnace 变压器， 电铃变压器，空调内的压缩机上如有crankcase heater的话， 等等
。。。 |
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n****7
发帖数: 8354 | 40 If the dipstick shows a full oil level, then low oil obviously isn't your
problem. The oil pressure may be low because of a worn or broken oil pump, a
plugged oil pickup screen in the engine's crankcase, possibly a plugged oil
filter or excessive bearing wear. Or, the oil pressure may be fine but the
oil pressure sending unit has failed. Further diagnosis will be required to
determine what's wrong.
http://autos.yahoo.com/maintain/repairqa/warning_lights/ques051_0.html |
|
n***o
发帖数: 210 | 41 Similar function as PCV system. However, it has a "trap" for oil vapor,
which is prone to blockage, thus increased crankcase pressure, thus oil
leakage.
Yeah, 236bhp @ 5100.
Did not drive hard since the torque rod bushing was broken. Will change it
soon. But when the turbo kicks in, you can heard a low "humming" sound, and
a slight push. High speed passing is really a brizz.
Will try it hard after all imperfections are addressed. |
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w******x
发帖数: 4396 | 42 engine bay cleaning is much more than pre-sale detailing. if you are doing
engine work a clean engine is much easier to work with. you don't need worry
about debris falling into crankcase or coolant passages. and you can easily
see any leaks afterward.
otoh, cleaning the bay just for the sake of it is kind of a waste of time. |
|
|
w******x
发帖数: 4396 | 44 从哪出来?是exhaust还是crankcase还是exhaust shroud? |
|
|
s*****n
发帖数: 134 | 46 04年的Taurus, 24valve DOHC 3.0L Duratec发动机，从dealer哪里买来开了两万麦到
了100K。之前自己换过前刹车片，自信心过度膨胀，于是想DIY 100K tune up. 因为是
V6发动机，前三个火花塞很好拆，后三个需要拆Upper Intake Manifold，对其难度估
计过低。
按照保养手册上的指示要换的几样东西就是火花塞，PCV(positive crankcase
ventilation) valve，有必要的话可以把Upper Intake Manifold的垫圈也换了。零件
在Rockauto上买的，感觉比Amazon 和 Autozone都要便宜一点，倒是工具前前后后跑了
好几趟Zone，共计有spark plug socket, extension bar, vice grip, 还有一个很变
态很贵的专门用来解 hose clamp的工具http://www.sears.com/shc/s/p_10153_12605_00947390000P
纯新手操作，完全依赖于这个youtube上的视频http://www.youtub... 阅读全帖 |
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c*********r
发帖数: 19468 | 47 not that easy
the R35 is a purpose-built sports car, with many features an M3 won't have
in the near future. Just name some: the rear-mid-mounted transaxle and the
front diff in crankcase |
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x*b
发帖数: 5723 | 48 减重实在太牛了，比E46 M3还要轻!! 这性能绝对同级别再次无争议的标杆!
ENGINE
Inline 6 cylinder engine with two mono-scroll turbochargers◦Direct
Injection
VALVETRONIC
Double-VANOS
closed-decked crankcase
twin-wire arc-spray coating (instead of liners) in cylinder bores reduce
engine weight
430 HP (approximately)
369+ LB-FT (500 Nm)
Higher than 7500 RPM redline
WEIGHT
Under 3,306 lb (1500kg) weight (no mention if this is curb weight and no
specifics provided as to what equipment included/not included in figure)
compare to... 阅读全帖 |
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p*********e
发帖数: 32207 | 49 ☆─────────────────────────────────────☆
yeemartin (猪头) 于 (Mon Aug 17 05:10:38 2009, 美东) 提到:
看了一篇的文章
有解释为啥Shell Rotella T、Mobil Delvac这些heavy duty diesel oil的Used oil
analysis结果都很突出的原因，普通engine oil是S certification，例如SJ、SM。商
用truck engine oil是C certification， 目前是CI、CJ。C的additive package比S的
牛x很多，但有可能会不兼容乘用车上的catalytic converter。
我的G35目前就在用Shell Rotella T，摩托车下次换油也准备用这个。mobil的
synthetic motorcycle oil 1 quart 12刀，受不了。
Commercial (Diesel) Oil
The additive packages for C (commercial) certification... 阅读全帖 |
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m****a
发帖数: 2593 | 50 来自主题: _Auto_Fans版 - [无标题] If you move to more late model stuff, the situation gets a bit more dire.
Let’s take the E46 M3, for example. It featured a 333-horsepower naturally
aspirated inline six cylinder engine that was more unreliable than an AA
meeting sponsored by Miller Lite. These engines were were plagued with
connecting rod bearing failures, issues with the variable cam timing (VANOS)
, crankcase ventilation failures, hard starting, and their cooling systems
were made of plastic and sealed, ensuring catastrophic ... 阅读全帖 |
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