-----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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