Long-Stroke Engines and Oil Consumption

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b1377@worldnet.att.net - 08 Jun 2006 02:13 GMT

Allpar.com has a nice interview with a former Chrysler engineer -

http://www.allpar.com/corporate/bios/hagenbuch-interview.html
wherein it is said - long stroke engines suffer from "poor top end
performance and difficulty in attaining satisfactory oil economy."

I knew about the top end performance issue, but oil consumption
problems I did not know about, Why does a long stroke result in oil
consumption issues?

Just wonderin'

Thanks,

Jim

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Shep - 08 Jun 2006 02:18 GMT

Well certainly more cylinder wall is exposed to oil for one.

> Allpar.com has a nice interview with a former Chrysler engineer -
>
[quoted text clipped - 13 lines]
>
> To reply via e-mail, remove the "1" from the address.

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b1377@worldnet.att.net - 08 Jun 2006 02:25 GMT

That was quick - thanks, Shep!!!

I was thinking that. Is it because the oil builds up like snow on a
shovel pushed in a straight line, and eventually if you plow too long.
it" overflows" the blade?

Forgive me - I suspect I'm overlooking the obvious.

P.S. Lots of nice nuggets of info in that article.

Thanks again,

Jim

>Well certainly more cylinder wall is exposed to oil for one.
>> Allpar.com has a nice interview with a former Chrysler engineer -
[quoted text clipped - 18 lines]
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TeGGeR® - 08 Jun 2006 02:34 GMT

> Allpar.com has a nice interview with a former Chrysler engineer -
>
[quoted text clipped - 5 lines]
> problems I did not know about, Why does a long stroke result in oil
> consumption issues?

High piston speeds. The oil can't get out of the way fast enough.

Same sort of thing occurs if too much oil is thrown on to the cylinder
walls on account of worn crank/connecting rod bearings.

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b1377@worldnet.att.net - 08 Jun 2006 02:38 GMT

Wow - this is great - you guys are really kickin' in!!!

Forgot about the piston speed issue - would have loved to see that in
various Internal Combustion Engine books - common sense prevails!!!

Thanks,

Jim

>> Allpar.com has a nice interview with a former Chrysler engineer -
>>
[quoted text clipped - 10 lines]
>Same sort of thing occurs if too much oil is thrown on to the cylinder
>walls on account of worn crank/connecting rod bearings.

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Chas Hurst - 08 Jun 2006 02:36 GMT

> Allpar.com has a nice interview with a former Chrysler engineer -
>
[quoted text clipped - 11 lines]
>
> Jim

A properly designed engine won't have "difficulty in attaining satifactory
oil economy". There are multitudes of engines that are undersquare (stroke
larger than bore) that have absolutely no "oil economy" issues. And of
course, the comment comes from a Chrysler engineer, so consider the source.

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Shep - 08 Jun 2006 02:42 GMT

You are right, but as the engine weakens, ie: oil ring efficiency, cylinder
and piston wear, the long stroke engine would suffer more oil consumption to
some degree. But I agree this is not a chronic problem in the over square
engines produced today. I think the point was probably the potential is
greater in that design engine.

>> Allpar.com has a nice interview with a former Chrysler engineer -
>>
[quoted text clipped - 17 lines]
> course, the comment comes from a Chrysler engineer, so consider the
> source.

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b1377@worldnet.att.net - 08 Jun 2006 02:55 GMT

Shep:

There are a bunch of undersquare engines in production today. Oil
consumption is probably addressed by detail to design, but I thought
it was interesting nonetheless.

Jim

>You are right, but as the engine weakens, ie: oil ring efficiency, cylinder
>and piston wear, the long stroke engine would suffer more oil consumption to
[quoted text clipped - 27 lines]
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>----= East and West-Coast Server Farms - Total Privacy via Encryption =----

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b1377@worldnet.att.net - 08 Jun 2006 02:43 GMT

Chaz,

I know what you're saying. The engineers know what you're saying. The
problem is somewhat North - from the article -

"It’s those kinds of decisions that get made, from the outside looking
in you think these guys have their heads up their a.ses, but there is
usually a reason for something like this."

>> Allpar.com has a nice interview with a former Chrysler engineer -
>>
[quoted text clipped - 16 lines]
>larger than bore) that have absolutely no "oil economy" issues. And of
>course, the comment comes from a Chrysler engineer, so consider the source.

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