s******o
发帖数: 656 | |
s******o
发帖数: 656 | |
w******x
发帖数: 4396 | 3 b5254t? a 10 year old engine.
【在 s******o 的大作中提到】
: 看着参数不错，达人们说说这个发动机皮实吗
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s******o
发帖数: 656 | 4 b5254t4，装在07 S60上的那个，专家给点评一下吧
【在 w******x 的大作中提到】
: b5254t? a 10 year old engine.
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w******x
发帖数: 4396 | 5 still, a 10 year old engine in its current form. pretty much a b5234 (which
dates back to '92) bored over with variable valve timing and a turbo.
a bit more info here.
http://www.volvoclub.org.uk/tech/2004r/R5-Engines.pdf
【在 s******o 的大作中提到】
: b5254t4，装在07 S60上的那个，专家给点评一下吧
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s******o
发帖数: 656 | 6 我靠，这个太专业了，看不懂。不过看升功率跟升扭矩都不错呀
(which
【在 w******x 的大作中提到】
: still, a 10 year old engine in its current form. pretty much a b5234 (which
: dates back to '92) bored over with variable valve timing and a turbo.
: a bit more info here.
: http://www.volvoclub.org.uk/tech/2004r/R5-Engines.pdf
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w******x
发帖数: 4396 | 7 turbo的说这两个没太大意义。
【在 s******o 的大作中提到】
: 我靠，这个太专业了，看不懂。不过看升功率跟升扭矩都不错呀
:
: (which
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s******o
发帖数: 656 | 8 也就是说这个发动机技术比较落后了？
【在 w******x 的大作中提到】
: turbo的说这两个没太大意义。
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c*********r
发帖数: 19468 | 9 除非特别牛的，否则不建议I5，先天不足
【在 s******o 的大作中提到】
: 看着参数不错，达人们说说这个发动机皮实吗
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f********m
发帖数: 8397 | 10 为什么呀？
【在 c*********r 的大作中提到】
: 除非特别牛的，否则不建议I5，先天不足
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w******x
发帖数: 4396 | 11 other than the intake runner length problem, what else?
【在 c*********r 的大作中提到】
: 除非特别牛的，否则不建议I5，先天不足
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c*********r
发帖数: 19468 | 12 平顺性、成本……各方面都有些尴尬
【在 f********m 的大作中提到】
: 为什么呀？
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D*****I
发帖数: 8268 | 13 not natually balanced
【在 f********m 的大作中提到】
: 为什么呀？
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f********m
发帖数: 8397 | 14 should I5 be smoother than I6 or worse?
【在 c*********r 的大作中提到】
: 平顺性、成本……各方面都有些尴尬
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D*****I
发帖数: 8268 | 15 I6 is the best
【在 f********m 的大作中提到】
: should I5 be smoother than I6 or worse?
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w******x
发帖数: 4396 | 16 well, neither is i4. at least i5 has some overlap.
【在 D*****I 的大作中提到】
: not natually balanced
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c*********r
发帖数: 19468 | 17 u kidding... no comparison at all...
【在 f********m 的大作中提到】
: should I5 be smoother than I6 or worse?
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D*****I
发帖数: 8268 | 18 i5的2nd 和3rd order vibration 都增多了
高rpm的时候就不灵了
【在 w******x 的大作中提到】
: well, neither is i4. at least i5 has some overlap.
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c*********r
发帖数: 19468 | 19 overlap is just one thing
consider the following:
I4:
1st order force: balanced
2nd order force: imbalanced
1st order moment: balanced
2nd order moment: balanced
so, for an I4, you can easily correct its vibration by adding a pair of
double speed balance shafts
I5:
1st order force: balanced
2nd order force: balanced
1st order moment: imbalanced
2nd order moment: imbalanced
here's the issue: you can probably make up for the 1st order moment but the
2nd order moment on an I5 is
actually almost as
【在 w******x 的大作中提到】
: well, neither is i4. at least i5 has some overlap.
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c*********r
发帖数: 19468 | 20 other issues of I5s:
let's take the TT RS as an example.
it has only one turbo.
ok, you can say "show me a turbo I4 with 2 turbos"
this is not the issue. you can use a twin-scroll turbo on a high-output
turbo I4
even on others that have no twin-scroll turbo, such as the 2.0T on the TTS,
the exhaust manifold can still be
separated in a similar way. how can you do this on an I5?
【在 c*********r 的大作中提到】
: overlap is just one thing
: consider the following:
: I4:
: 1st order force: balanced
: 2nd order force: imbalanced
: 1st order moment: balanced
: 2nd order moment: balanced
: so, for an I4, you can easily correct its vibration by adding a pair of
: double speed balance shafts
: I5:
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w******x
发帖数: 4396 | 21 sure, it's not perfect. the inherent imbalance in torque is just a tradeoff
for overlap compared to i4 and for better packaging compared to i6 esp in
FWD applications. you can't have everything all at once. at least you CAN
balance an i5, but there's no way you can give i4 any overlap.
as for turbo setup--if you can't use parallel twin turbo, try sequential
twins.
【在 c*********r 的大作中提到】
: overlap is just one thing
: consider the following:
: I4:
: 1st order force: balanced
: 2nd order force: imbalanced
: 1st order moment: balanced
: 2nd order moment: balanced
: so, for an I4, you can easily correct its vibration by adding a pair of
: double speed balance shafts
: I5:
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c*********r
发帖数: 19468 | 22 I can simply put a decently balanced (turbo) I4 wherever you use a (turbo)
I5. why do I need overlap? to reduce
the size of the flywheel? come on...
as for I6... do I really need a transverse I6 on an FWD? I don't think so.
why not just a normal V6?
tradeoff
【在 w******x 的大作中提到】
: sure, it's not perfect. the inherent imbalance in torque is just a tradeoff
: for overlap compared to i4 and for better packaging compared to i6 esp in
: FWD applications. you can't have everything all at once. at least you CAN
: balance an i5, but there's no way you can give i4 any overlap.
: as for turbo setup--if you can't use parallel twin turbo, try sequential
: twins.
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D*****I
发帖数: 8268 | 23 overlap本身就是平顺性的一个方面而已
i5高转速就比不过i4了啊
balance shaft也要占空间
奇数缸本来就有先天缺陷
市场也已经作了选择
tradeoff
【在 w******x 的大作中提到】
: sure, it's not perfect. the inherent imbalance in torque is just a tradeoff
: for overlap compared to i4 and for better packaging compared to i6 esp in
: FWD applications. you can't have everything all at once. at least you CAN
: balance an i5, but there's no way you can give i4 any overlap.
: as for turbo setup--if you can't use parallel twin turbo, try sequential
: twins.
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c*********r
发帖数: 19468 | 24 it's not about how many turbo do you need
you cannot easily design a exhaust manifold with relatively stabilized back
pressure (for the cylinders)
and exhaust flow (for the turbo) for an I5
tradeoff
【在 w******x 的大作中提到】
: sure, it's not perfect. the inherent imbalance in torque is just a tradeoff
: for overlap compared to i4 and for better packaging compared to i6 esp in
: FWD applications. you can't have everything all at once. at least you CAN
: balance an i5, but there's no way you can give i4 any overlap.
: as for turbo setup--if you can't use parallel twin turbo, try sequential
: twins.
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c*********r
发帖数: 19468 | 25 Volvo has debuted their new direct injection turbo I4.
I guess they'll phase out their I5s gradually in the future.
【在 D*****I 的大作中提到】
: overlap本身就是平顺性的一个方面而已
: i5高转速就比不过i4了啊
: balance shaft也要占空间
: 奇数缸本来就有先天缺陷
: 市场也已经作了选择
:
: tradeoff
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R*******a
发帖数: 2463 | 26 Volvo的I5，70年代就开始用了吧
当然这只是说明历史悠久，不代表性能不行
Jaguar 的AJ V8还可以追溯到50年代呢
不一样还装在range rover sport上 |
s******o
发帖数: 656 | 27 碳大侠开什么车？
【在 c*********r 的大作中提到】
: 平顺性、成本……各方面都有些尴尬
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w******x
发帖数: 4396 | 28 lol let's leave the "market selection" crap out of this shall we? market is
limited by technology and resources, not the other way around.
【在 D*****I 的大作中提到】
: overlap本身就是平顺性的一个方面而已
: i5高转速就比不过i4了啊
: balance shaft也要占空间
: 奇数缸本来就有先天缺陷
: 市场也已经作了选择
:
: tradeoff
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w******x
发帖数: 4396 | 29 where did you get that idea from? never heard of a volvo 5 cylinder before
1992. the diesel 5 cylinder is from vw.
【在 R*******a 的大作中提到】
: Volvo的I5，70年代就开始用了吧
: 当然这只是说明历史悠久，不代表性能不行
: Jaguar 的AJ V8还可以追溯到50年代呢
: 不一样还装在range rover sport上
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w******x
发帖数: 4396 | 30 that's true. plumbing is an issue on i5. as for overlap, of course a smaller
flywheel is good.
back
【在 c*********r 的大作中提到】
: it's not about how many turbo do you need
: you cannot easily design a exhaust manifold with relatively stabilized back
: pressure (for the cylinders)
: and exhaust flow (for the turbo) for an I5
:
: tradeoff
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c*********r
发帖数: 19468 | 31 I'd rather take a balanced I4...
smaller
【在 w******x 的大作中提到】
: that's true. plumbing is an issue on i5. as for overlap, of course a smaller
: flywheel is good.
:
: back
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D*****I
发帖数: 8268 | 32 market drives all
technology wise, i don't respect i5
is
【在 w******x 的大作中提到】
: lol let's leave the "market selection" crap out of this shall we? market is
: limited by technology and resources, not the other way around.
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