RE: Your Bosch Connection

["Avi Meron" <avi@cosmoslink.net>]

Even though compression ratios are lower in turbo engines, is
the "effective" compression in the cylinder higher due to the turbo compared
to a normally aspirated engine?

You are right, the "effective" compression ratio is called BMEP (brake mean
effective pressure) and it is higher in a Turbo engine.
Avi

-----Original Message-----
From:	owner-quattro@coimbra.ans.net [mailto:owner-quattro@coimbra.ans.net]
On Behalf Of Browning David (TVCS)
Sent:	Tuesday, October 27, 1998 5:32 AM
To:	'Lewis, Gary M'; 'Q-list'
Subject:	RE: Your Bosch Connection

Neither are turbos.  They have seemed to last a long while despite the fact
that the teeny, tiny center erodes down into the ceramic.  I'm surprised
they still fire that well.  It must be a compression thing that makes the
difference.  Even though compression ratios are lower in turbo engines, is
the "effective" compression in the cylinder higher due to the turbo compared
to a normally aspirated engine?  I started using them years ago when they
first came out and haven't had any problems with them.  But then again, I
can't afford these fancy turbo cars to know that they won't work.  I'll
probably stick with the triples on my '86 4000, and maybe replace the
platinums in the 944 with triples when they wear out.

It's like oil or anything else, everyone has their own preferences and think
that it's the absolute gospel truth.  I still use 10W40 even though people
look upon it with disdain.

dB

> -----Original Message-----
> From:	Lewis, Gary M [SMTP:Gary.Lewis@West.Boeing.com]
> Sent:	Monday, October 26, 1998 7:38 PM
> To:	'Q-list'; 'Browning David (TVCS)'
> Subject:	RE: Your Bosch Connection
>
> David said:
>
> > Just another data point:
> > I have had the "chain store" platinums in my 944 for the past 20k miles
> > with
> > no problems.  (I've also run them in an '81 Rabbit for much longer with
> no
> > problems.)
> > dB
> >
> Is either car a turbo?  It has been posted many times and proved to I
> believe Ned Ritchie's satisfaction (go to his website) that "Chain Store"
> (tm) platinums DON'T work in 5000/200 TURBO'S, and I believe this applies
> to
> S4/S6 cars as well.  I would venture to say that they won't work well in a
> 944 turbo either.  And I haven't a clue as to why.  Buy the triples.  I've
> used both Bosch and NGK, both seem fine to me.  I haven't used the "Real"
> platinums (you know, the $12-$20 ea ones), so no comment, but I hear they
> are good.
> HTH,
>
> Gary Lewis
> 88 5kcstq 0.0 bar 108km Pearl w/Fuchs
> 86 5Kcst 5sp 1.8 Bar 200km Sapphire
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