Diesel RVs: Re: [diesel_mercedes] running centrifuged oil

Ok. But something here is still confusing me because the 300d Mercedes Om617 engine has a compression ratio of 21,5 and a turbo! Presumably there must be some advantage to this.

The 240/300d engines are pre chamber - would that explain it?

/KJ.

2010/12/29 Nate Rector <tccservice111@yahoo.com>

High compression is now acheived by using superchargers or turbos.So they can build a lower compression engine then blow air into it.

--- On Wed, 12/29/10, Old Grumpy <grumpygubbe@gmail.com> wrote:

From: Old Grumpy <grumpygubbe@gmail.com>
Subject: Re: [diesel_mercedes] running centrifuged oil

To: diesel_mercedes@yahoogroups.com
Date: Wednesday, December 29, 2010, 3:16 AM

That's interesting and heres the difference: In an auto-ignition diesel engine, (no electrical sparking plug—the hot air of compression lights the injected fuel) the CR will customarily exceed 14:1. Ratios over 22:1 are common. The appropriate compression ratio depends on the design of the cylinder head. The figure is usually between 14:1 and 16:1 for direct injection engines and between 18:1 and 23:1 for indirect injection engines. I wonder though what difference would that make? Would the fuel ignite more eficiently at a higher compression compared to low? Would the ignition temperature be higher the higher the compression or is it just a design issue..........

/KJ.

2010/12/29 briankk <briankk@att.net>

FWIW, the Cummins has 16:1 compression, I think the 240 is 21:1...

bk

--- On Tue, 12/28/10, ygmir111 <ygmir111@att.net> wrote:

> From: ygmir111 <ygmir111@att.net>
> Subject: [diesel_mercedes] running centrifuged oil
> To: diesel_mercedes@yahoogroups.com, 126diesel@yahoogroups.com
> Date: Tuesday, December 28, 2010, 2:23 PM

> HI all,
> so, I'm running my first batch of WMO, in my 93 Dodge
> Cummins.
> I'm using this truck, as my first test, since, it is
> easiest starting, and
> probably better compression than the 240D.
>
> I'm running 25% WMO, to diesel.
> It seems to start and run fine.
> Slightly more smoke, I think.
>
> so, so far, so good.
>
> I may wait for warmer weather, to put the WMO fuel in the
> 240, just from
> starting issues.
>
> Henry
>
>
>
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