Hmm. My experience is that the VW/Audi engine is MUCH noisier than the
Benz engine -- my Volvo used to turn heads at idle, clanking and
banging away. Currently suffering from, I think, another dead IP.
The rotary pump has a large piston flying back and forth, I'd not
expect it to be any qui
The fuel must actually ignite after TDC, but the actual ignition timing
has to be set faster -- takes a finite amount of time for the spark to
actually jump the gap and from there to actually ignite the bulk of the
fuel. The faster the engine is turning, the more "lead time" the spark
must hav
Jim Cathey wrote:
> I am told that a surprising amount of the diesel's noise is
> due to the Bosch inline pump. I test-drove an older Dodge diesel
> (for a fellow lister) once that had a rotary pump in it, and it
> was noticeably quieter than mine, which has an inline P7100.
> The pump on a test s
Gerald R. Flintrop wrote:
> The part about, "the fuel mixture must be ignited after TDC, else you get
> spark knock" makes me wonder about the static and dynamic (vacuum and
> centrifugal) timing settings on the old mechanical distributors. I seem to
> recall that they would often start out at 8-10
: Re: [MBZ] what IS the "diesel noise"?
Peter
Thanks for the explanation. Write more!
tnx
73
Hank WD5JFR
- Original Message -
From: "Peter Frederick" <[EMAIL PROTECTED]>
To: "Mercedes Discussion List" <[EMAIL PROTECTED]>
Sent: Sunday, February 05,
Peter
Thanks for the explanation. Write more!
tnx
73
Hank WD5JFR
- Original Message -
From: "Peter Frederick" <[EMAIL PROTECTED]>
To: "Mercedes Discussion List" <[EMAIL PROTECTED]>
Sent: Sunday, February 05, 2006 9:12 AM
Subject: Re: [MBZ] what I
Gasoline engines have a fairly rapid burn, so the fuel mixture must be
ignited after TDC, else you get spark knock. Diesel engines indeed
have fuel injected for a large portion of the power stroke (and in
fact, sometime after when people fiddle with the IP to get more power
-- also more black
Diesels cannot detonate, the fuel has to be all present at once for
detonation to occur.
Here's my theory:
Detonation, like the technical definition of explosion, is when the
combustion wavefront is faster than the speed of sound in the mix.
Modern gunpowder is a propellent, for example, wherea
Craig McCluskey wrote:
> I had heard the opposite: that combustion in gasoline engines was rapid
> and that combustion in diesel engines was slower. The slower combustion,
> over much of the piston's downward travel, was what was supposed to give
> diesels the higher characteristic torque.
I beli
On Fri, 3 Feb 2006 23:25:37 -0800 Alex Chamberlain
<[EMAIL PROTECTED]> wrote:
> I had the impression that there WAS no "combustion front" in a diesel in
> the sense that there is in a spark ignition engine... rather, all the
> fuel combusts simultaneously as it is sprayed into the hot air in the
>
I had the impression that there WAS no "combustion front" in a diesel in the
sense that there is in a spark ignition engine... rather, all the fuel
combusts simultaneously as it is sprayed into the hot air in the prechamber
or cylinder at the top of the compression stroke. Always assumed THIS was
The noise is a combination of things, starting with a supersonic shock
wave at the combustion front. Fixed timing engines also suffer from
excessively early injection at idle, contributing to the noise in the
same way spark knock does.
The high speed swirl in the prechamber breaks up the shoc
Danke Doktor!
Chris
Marshall Booth <[EMAIL PROTECTED]> wrote: Christopher McCann wrote:
> I'm talking about a perfectly healthy purring engine. I'm thinking:
>
> 1. Injection pump getting fuel up to pressure (BTW, what pressure does the
> fuel inject at on an OM617? OM603?)
> 2. The
about.
Trampas
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Marshall Booth
Sent: Friday, February 03, 2006 3:59 PM
To: Mercedes Discussion List
Subject: Re: [MBZ] what IS the "diesel noise"?
Christopher McCann wrote:
> I'm talking
Christopher McCann wrote:
I'm talking about a perfectly healthy purring engine. I'm thinking:
1. Injection pump getting fuel up to pressure (BTW, what pressure does the fuel inject at on an OM617? OM603?)
2. The detonation under higher compression
New injector injection pressure for a n
I'm talking about a perfectly healthy purring engine. I'm thinking:
1. Injection pump getting fuel up to pressure (BTW, what pressure does the
fuel inject at on an OM617? OM603?)
2. The detonation under higher compression
Thanks!
Christopher McCann, Squier Park, Kansas City, Missou
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