j********2
发帖数: 4438 | 1 camshaft不是小事啊，估计timing没对上，说不定哪天就撂路上了。 |
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Q********g
发帖数: 2465 | 2 这么热闹的帖子，踩一脚说两句：
我是半专业修车的，自个换过正时皮带，
你那个灯亮了，是因为对正时的时候crankshaft 和
Camshaft的 timing mark 没有对准，有可能错了半齿或一个齿。这个很常见。
错过了正时， 发动机的活塞和进气就出现不合拍，造成燃烧不充分，从而尾气排放不
合格，造成engine light 亮。
自
发动机灯亮是监测尾气标准的，任何机械故障会造成尾气超标的都会trip engine
light. |
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h****y
发帖数: 9234 | 3 就是把那个引擎再加强一下吧.
The Golf R features these main upgrades over the standard FSI EA888 engine:
Lower compression forged pistons
Strengthened connecting rods
Enlarged wrist pins
Stronger piston rings
Upgraded bearings
Reinforced engine block
Upgraded camshafts (longer duration)
Upgraded injectors (+13% flow)
Larger K04 turbo producing 1.2 bar of boost (+3 PSI over K03 equipped GTI)
Larger intercooler (+30%)
Relocated bypass valve |
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m****i
发帖数: 4452 | 4 The codes relate to the intake valve timing control. This is not the
camshaft angle sensor or the crank angle sensor. Basically, Nissan uses
variable valve timing and what is going on is the variable valve timing is
sticking. This was a problem on older Nissan cars. After 1999 the problem
was pretty much corrected. Now, you say that after the oil was changed the
problem goes away for a time. Just to let you know, the variable valve
timing uses oil and the variation in oil pressure to advan |
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b*******r
发帖数: 5 | 5 我去 autozone 查了，用的OBD-II仪表，读出来的code是P0341 Camshaft Position
Sensor Circuit Range/Performance。 他们可以帮忙读code，但他们不会清除代码，
他们建议我去dealer那里。
因为我想知道是否因为这个DISTRIBUTOR的问题引起check engine light亮，所以清除
一下内存，如果灯还亮，说明是其他问题了。所以，还请coliphage 说说怎么清除吧，
谢谢了~~~
原因 |
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m**********1
发帖数: 43 | 6 所有的fluids全换了.also换了火花塞，camshaft, home brew cai (heat shileld
later)
dont tell me i need strut tower brace, its useless and only a piece of eye
candy :) |
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m**********1
发帖数: 43 | 7 不喜欢canada，原来的车主把motor给blown了，dealer找不到好地us spec motor，就
搞了个euro spec的。但是detune过，搞成了single vanos，现在给我换成了dual
vanos,在搞了uuc 的rsc36,还有racing camshaft。但是好久没有dyno了，不知道具体多少rwhp |
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p*********e
发帖数: 32207 | 8 ☆─────────────────────────────────────☆
mianhuatang1 (红棉花糖) 于 (Sat Jun 21 13:51:25 2008) 提到:
所有的fluids全换了.also换了火花塞，camshaft, home brew cai (heat shileld
later)
dont tell me i need strut tower brace, its useless and only a piece of eye
candy :)
☆─────────────────────────────────────☆
Kiroro (山顶冻人) 于 (Sat Jun 21 15:52:08 2008) 提到:
nice！you may need a box for that filter to block the heat
☆─────────────────────────────────────☆
Kiroro (山顶冻人) 于 (Sat Jun 21 15:54:50 2008) 提到:
damn i |
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y*******n
发帖数: 10103 | 9 发动机里很多都不是铁啊。不是铁、镍的都吸不到。。
机油里的金属：
Iron: Comes from cylinder liner, camshaft, oil pump, and timing chain wear
Chromium: Comes from piston ring wear
Copper: Comes from bearings, valve guides, and bushings wear
Lead: Comes from bearing wear
Aluminum: Comes from piston and piston thrust bearing wear
Silver & Tin: Comes from bearing wear |
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y*******n
发帖数: 10103 | 10 来自主题: _Auto_Fans版 - bmw问题 只要是Overhead camshaft都会有点ticking的啦。 |
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r**********e
发帖数: 2821 | 11 crankshaft position sensor? 应该不是camshaft position sensor吧，俺认识的一个
阿三的altima也是这个sensor挂了。 |
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p*********e
发帖数: 32207 | 12 "
However, let's look at some astounding domestic technology. The 2006 Nextel
Cup engine is a severely-restricted powerplant, being derived from
production
components. It uses a production-based cast-iron 90V8 block and 90steel
crankshaft, with a maximum displacement of 358 CID (5.87 liters). A typical
configuration has a 4.185" bore with a 3.25" stroke and a 6.20" conrod (
R/S = 1.91). Cylinder heads are similarly production-based, limited to two
valves per cylinder, but highly developed. The ... 阅读全帖 |
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k**0
发帖数: 19737 | 13 直接贴一段GOOGLE来的东西吧! 去睡了.
OHV means OverHead Valve - an engine design where the camshaft is installed
inside the engine block and valves are operated through lifters, pushrods
and rocker arms (an OHV engine also known as "Pushrod" engine). Although an
OHV design is a bit outdated, it has been successfully used for decades. An
OHV engine is very simple, has more compact size and proven to be durable.
Downside: it's difficult to precisely control the valve timing at high rpm
due to higher inertia cau |
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c*********r
发帖数: 19468 | 14 简单的点评一下：
OHV means OverHead Valve - an engine design where the camshaft is installed
inside the engine block and valves are operated through lifters, pushrods
and rocker arms (an OHV engine also known as "Pushrod" engine). Although an
OHV design is a bit outdated, it has been successfully used for decades.
误区，OHV的进化又没有停止过，哪来的outdated?
说起来DOHC还比OHV早出现了将近40年呢
An OHV engine is very simple, has more compact size and proven to be durable.
Downside: it's difficult to precisely control the valve timin |
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c*********r
发帖数: 19468 | 15 much smaller S65B40's
for DOHCs, the twin camshafts are PART of the cylinder head
and they're revving parts, so you have to further strengthen the head due to
NVH concerns
so the head is finally much taller than the one on a OHV
I once presented you the picture showing Ford's 4.6L DOHC and 5.0L OHV
together
probably you didn't pay any attention to it...
go look at that picture, you'll understand why I say an OHV head is much
more compact than a DOHC head.
59 |
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x*x
发帖数: 2001 | 16 我的E39 528的camshaft position sensor坏掉的时候，
是导致vanos不正常，结果就是2500转一下明显乏力 |
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y*******n
发帖数: 10103 | 17 boxer engine要用dohc得用4根camshaft，成本比较高，只有wrx、sti上才舍得用啊。
不过它这个sohc的性能也说的过去了，跟主流买菜车4缸DOHC性能差不多。 |
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f********m
发帖数: 8397 | 18 Subframe done on7/17/2006
Cooling completed on 12/2006
Cooling-Parts came from Bavarian Autosport and have ALL receipts: Water
pump, gasket, pulley, all belts, expansion tank bleeder, radiator cap,
both upper and lower hose, thermostat... all is new and should not have
to be touched for another 70K miles.
Another item that malfunctions are the camshaft position sensor (intake
and exhaust), both were replaced in 11/2007.. also have receipts.
Subframe done on 7/2006: Based on the $2.8K invoice mos |
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a********e
发帖数: 3771 | 19 update: code P0340
小二参考VW的explanation，说camshaft position (ＣＭＰ）sensor “intake"
circuit bank 1
Explanation：
1 poor electrical connection
2 faulty CMP sensor
3 engine mechanical condition
他拔下code reader以后CEL就灭了，直到开回家一直没亮。
偶正在学习saabcentral的历史文件。 |
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s**n
发帖数: 996 | 20 问题是那个P0316，好像是camshaft sensor的问题，这个好像是vulcan的常见毛病 |
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s******o
发帖数: 2233 | 21 还有water pump，window regulator，camshaft position sensor。。。 |
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s******o
发帖数: 2233 | 22 还有water pump，window regulator，camshaft position sensor。。。 |
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l******a
发帖数: 10467 | 23 换timing belt的时候最好把camshaft seal, crankshaft sal, oil pump seal以及
oring一起换了， 这些东西到这个岁数都老化了， carnkshaft seal只是其中的一个 |
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s********n
发帖数: 63 | 24 今天换vlave cover gasket， 看见 camshaft 上面的sludge 很多，类似于照片里面的。
不要骂我啦，车拿来的时候就这样。（98 mazda prptege lx）
还很脆，大多一碰就掉，让我很紧张，因为common sense 告诉我掉在机油系统里面可
能后果不大
好。
大家都说说看，也算是給我建议：
如何有效（安全）的除掉这些东西？ |
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R****n
发帖数: 708 | 25 最近入手了一辆07 mercury montego. check engine light 检查出来code P0340. 因
为赶着回家，就在当地一个dealer检查了一下，花了100多。本来想自己换一下，回来
一看powertrain是五年保修，这个检查的钱是不是应该可以要回来？维修是不是也免费
的？ |
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d***8
发帖数: 2039 | 26 换 Crankshaft seal and two camshaft seals. |
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d********5
发帖数: 31 | 27 谢谢大家的回复了，后来又去dealer了，结果
那边人说这次绝对修好了，然后发现其实是
camshaft sensor的问题， 又要450刀，最后
和他们吵结果还是交了150.
要是自己能找到问题自己修就好了 |
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i****x
发帖数: 17565 | 28 我知道matlab可以做傅里叶分析，但我手里没有。我能听出I5/V10的两个主频率相差约
为一个小三度，所以我预测在matlab的频谱分析上应该能看出两个高峰，而且频率值之
比约为2的四次方根(2^(3/12))，也就是一个比另一个高12%。版上有没有搞过频谱的来
试试？
至于我说我给出的声音特征是结构使然，属于逻辑推理。完全不同的I5车子，引擎声有
明显的相似特性，有两个解释：1、引擎结构使然；2、两车碰巧使用了一样的排气系统
。很明显，前者要合理得多。。。
用声音来分析机械是一门学问，通过噪音来找那个零件有明显振动。通过频率关系可以
推理出一些简单结论。比如有的引擎能听到八度的和声，八度意味着频率翻倍，也就是
说某个东西比另一个东西转的快一倍。crankshaft比camshaft就快一倍，balance
shaft又比crankshaft快一倍。诸如此类。 |
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c*********r
发帖数: 19468 | 29 汽油机的噪音主要来源确实是机械噪音，其中主要还是活塞在TDC附近发出的
其次是camshaft，这个转速只有曲轴一半
要说双倍转速的部件，I4的平衡轴倒是一个，但是不是噪音主要来源啦 |
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V***b
发帖数: 3419 | 30 就算不考虑价格的话，这个用在SL65 AMG上的turbo V12 (M158)还是挺古董的，一根
camshaft，一个缸上3个valve，没有VVT，没有DI。发动机重不说，声音也不行。
双离合也没有。
那两片树叶也有点接受不了。
排气倒是很漂亮。 |
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V***b
发帖数: 3419 | 31 这个气动气门当rpm高的时候气门的动作就变得难控制了，他把转速提到9000rpm的时候
，那个平台就不见了，变成了尖尖的峰，所以说气门开关动作还是不够快。也许菜车低
转速引擎用这个合适。另外不知道VVL如何实现，传统的Camshaft （机械控制）+ CVVL
（电机控制）还是比这个可控性强吧。这系统重量体积真是优势。至于积累压缩空气普
通引擎也能做啦。 |
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p*********e
发帖数: 32207 | 32 嗯,气动本身不是问题,很成熟的技术
尖峰这个,毕竟你到9000rpm了本身给你开闭的时间窗口也很小
就算不用气动,传统的camshaft的话你利用凸轮轴,
cam和弹簧做动的话也不是真正的instantaneous,弹簧作用下气门归位也需要时间
如果能有对比看一下传统valvetrain在9000rpm下的表现或许更方便评估新系统的水平
另外这个气动我觉得不应该是简单的on/off,那么利用气动量控制做动行程
那就是vvl了
CVVL |
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l******o
发帖数: 1550 | 33 F1上18k rpm的气门就是压缩空气控制的，不知道开气门的程度是不是也是一个峰。反
正camshaft出来的肯定是一个峰。
我觉得主要是要歇缸的话，这么控制容易多了
CVVL |
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s*****b
发帖数: 4115 | 34 Nissan VQ35DE，2004，12万迈
P0021困扰了近半年，最近终于完全搞清楚，写下来供人参考吧。
三个体会：1.别乱扔钱买新零件，2.别图省钱省事引入新问题，新问题会把本来的问题
给遮住，把简单的问题复杂化，3.O Ring这些小东西尽量用原厂的，花几十块钱换个O
Ring也有一腚的道理。
P0021字面的查询结果是
A P0021 DTC trouble code may be caused by one or more of the following:
Incorrect camshaft timing
Wiring problems (harness/wiring) in intake timing control valve control
solenoid system
Continuous oil flow to VCT piston chamber
Failed timing valve control solenoid (stuck open)
如果去车铺，不懂行的上来就会让你换CPS/Crankshaft Sensor/IVT Solenoid，每个零... 阅读全帖 |
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e**n
发帖数: 1326 | 35 haha let's call that DOFC... double offset camshaft
下面的那套凸轮轴和推杆，只要厚度不超过油底壳的突出部分，应该也不会抬高发动机
.
些了 |
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e**n
发帖数: 1326 | 36 没错，都是老概念。
唯一区别就是都是通过推杆，而不是直接overhead cam （camshaft挪到中间或者侧
面），希望尽量减少boxer的宽度，所以不算是sohc or dohc. |
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a******7
发帖数: 7936 | 37 06 saab 9-5，经常白天开亮灯，晚上再出门就灭了，第二天早上又亮
抽空去Autozone读了code，有两个P1312， 和P0340
1312是Open or short circuit condition. Failed exhaust gas temperature sensor
. Poor electrical connection. Failed ignition coil.
0340是Camshaft position sensor signal.
上网做了一下功课，一般这两个code是火花塞问题
借了朋友的工具卸了火花塞看看，也看不出什么问题，不过还是去autozon买了NGK
PFR6H-10 Laser Platinum，还没现货，等了一天。测了一下gap，出厂大约是0.95mm不
到一点，就都调到0.95mm。
装好以后接头的地方抹一点Dielectric grease。再盖好DIC。
打火，还有灯。网上说如果故障消除了，是三次打火以后就会灭灯。
我是拆了dash左边的fuse box第三排左数第一个20 amp的fuse，等5分钟再装上，打火
。灯灭了
... 阅读全帖 |
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b*****e
发帖数: 819 | 38 1996 E36 M3, 5sp maunal, 210k miles. Yes, very high mileage. over $3000
replacement parts in past year. The owner is a guy I know. I want to buy
this car, and have fun as a toy for maybe several years, even though it
would be difficult to sell it later. The exterior and interior is very good
compared to other similar age E36.
Please help me to take a look at the stuff that have been changed, is there
anything also might need replacement? I will test drive the car next week.
Thanks!
AFTERMARKET:
... 阅读全帖 |
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e**n
发帖数: 1326 | 39 来自主题: _Auto_Fans版 - X5的引擎 "In the affected vehicles, the bolts that secure the housing for the
variable camshaft timing adjustment (VANOS) unit can loosen over time and
may possibly break."
虽然不是属于这个recall,我以前的n54的vanos也坏过一次.... |
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B*Z
发帖数: 7062 | 40 我自己查了查，现在已经不是twin spark了。四个valve都没地方对称的放spark plug。
不知道mb当初为什么那样设计。
The Mercedes-Benz M272 engine is a V6 automobile piston engine family used i
n the 2000s (decade). Introduced in 2004, it is based on the M112 V6 introdu
ced in 1998.
All M272 engines have aluminum engine blocks with a 90° vee angle with sili
con/aluminum lined cylinders. The aluminum DOHC cylinder heads have 4 valves
per cylinder. Direct injection is used in a limited fashion on the 3.5 L V6
, whereas others use conventional po... 阅读全帖 |
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c*********r
发帖数: 19468 | 41 1949/Ferrari 166 MM/Ferrari 2.0L SOHC V12
1950/Talbot-Lago T26 GS/Talbot-Lago 4.5L OHV twin camshafts I6
1951/Jaguar C-Type/Jaguar 3.4L DOHC I6
1952/Mercedes-Benz 300SL/Mercedes-Benz 3.0L SOHC I6
1953/Jaguar C-Type/Jaguar 3.4L DOHC I6
1954/Ferrari 375 Plus/Ferrari 4.9L SOHC V12
1955/Jaguar D-Type/Jaguar 3.4L DOHC I6
1956/Jaguar D-Type/Jaguar 3.4L DOHC I6
1957/Jaguar D-Type/Jaguar 3.8L DOHC I6
1958/Ferrari 250 TR/Ferrari 3.0L SOHC V12
1959/Aston Martin DBR1/Aston Martin 3.0L DOHC I6
（50年代英国车厂牛B，J... 阅读全帖 |
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o*v
发帖数: 371 | 42 ENGINE PULL DIY
TIMING CHAIN DIY (Will be available once i am able to get my hands on one)
Cost of Parts
Depending on your situation and your mechanical ability, the timing chain
service price can fluctuate. At the bare minimum you are looking at the cost
of the new parts if you plan on doing everything yourself. Here is a list
of the parts required for a COMPLETE overhaul. Please note that you may not
need to do everything listed here, such as the Cam Adjusters.
079109087N — Cam Adjuster [2]- $... 阅读全帖 |
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e*****n
发帖数: 124 | 43 要换个camshaft position sensor
不知道从哪儿买比较便宜点？ |
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