-----Original Message-----
From: Dave
Thomas [SMTP:[EMAIL PROTECTED]]
Sent: 21/11/2001
11:12
To: [EMAIL PROTECTED]
Subject: RE: Z18 questions
What pistons are used standard on a Z18ET? They aren't
forged are they?
>From: "Rowe, Adam"
>Reply-To: [EMAIL PROTECTED]
>To: [EMAIL PROTECTED]
>Subject: RE: Z18 questions
>Date: Wed, 21 Nov 2001 11:37:47 +1100
>
>The only way to control
detonation is to avoid it. I don't want to go
>against what Stewart W Rallying said, but I think the std
pistons are good
>for 20PSI if you avoid
detonation. That means you need to have your timing,
>Air/Fuel mixture ratio and air temperature in control. That
means either
>having your setup dynoed and
set up to avoid detonation, especially on the
>high peak boost you want to run. Or fitting some sort of
knock sensor,
>whether a std knock sensor or
a microphone type one, so you know when it is
>about to detonate and can back off and avoid doing damage.
>
>Water
cooling will only help if the problem is caused by after tubo air
>temps being too high. This will not help if
you are running too much
>advance. If you are
not running retard on boost, then 15 deg is too high
>for 12-15lb. IMHO at 3000rpm with 12 psi you should be
running around 4-5
>deg of advance MAX, with
a good intercooler.
>
>I have a set of pistons from a Z18 where the ring land
between the
>compression rings is broken. It
was from excessive boost causing
>detonation.
That must be where the detonation causes failure as the tops of
>the pistons are like new.
>
> > -----Original
Message-----
> > From: mark krawczuk
[SMTP:[EMAIL PROTECTED]]
> > Sent:
21/11/2001 10:17
> > To:
[EMAIL PROTECTED]
> >
Subject: Re: Z18 questions
> >
> > hi, i talked to stewart w ralling and
he said the pistons would be good
> > for
12 lb.( and i was running 15 lb for about 5 mins ) and stewart also
> > said that it was dentonation
> >
> >
> > i also phoned up a turbo place in nsw,
and he said it was dentonation.
> >
> > the two pistons looked absolutely fine
> > , besides the cracked lands, no sign
of any other damage.
> >
> >
> >
> > any ideas on how to controll dentonation? the dizzy was
modified for
> > 15 degrees, with engine
idling and vac line disc, and a total of 20
>
> degrees.
> > i have a inter cooler,
would water inject be a good idea?
> >
> >
> >
> > mark k
> >
> >
> > ----- Original Message -----
> > From: Rowe, Adam
> >
To: [EMAIL PROTECTED]
> >
> > Sent: Wednesday, November 21, 2001
9:17 AM
> > Subject: RE: Z18 questions
> >
> >
> > Are you sure it was the boost, and not
the detonation, that broke
> > the ring
lands?
> >
> > -----Original Message-----
> > From: mark krawczuk [SMTP:[EMAIL PROTECTED]]
> > Sent: 20/11/2001 20:48
> > To: [EMAIL PROTECTED]
> >
> >
Subject: Re: Z18 questions
> >
> > hi, steve t are u using factory z18
turbo pistons, what boost are
> > u
running?
> >
> > the ring land below 1st ring is cracked, stewart w
ralling said
> > that i was running too
much boost (15 lb)
> >
> > mark k
>
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