-----Original Message-----
From: David
Costello [SMTP:[EMAIL PROTECTED]]
Sent: 19/11/2001
11:29
To: [EMAIL PROTECTED]
Subject: Re: Z18 questions
it wasn't my choice to shave the head, they had
some problems with it and it was either shave the head or replace it and he
didn't have the money at the time..are Z18 head relatively cheap/easy to
find cause I'd be looking at replacing it.
also he didn't
downgrade from a T3 down to the T28
the
motor had a T25 on it when it came in from the importers, he upgraded it to
a T28.
I can't use a Z22 bottom end cause the car it's going into is only
just over 800kg which limits me to a 2L with forced induction.
I have a spare
L18 bottom end here, can I just bolt that under the Z18 head, instead of
going to the trouble of stripping the current one down to inspect
it.
Dave
----- Original Message -----
From: Rowe, Adam <mailto:[EMAIL PROTECTED]>
To:
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
Sent: Monday, November 19, 2001 10:09 AM
Subject: RE: Z18 questions
** See comments.
-----Original Message-----
From: David Costello [ SMTP:[EMAIL PROTECTED] <mailto:SMTP:[EMAIL PROTECTED]>]
Sent: 18/11/2001 19:18
To:
[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>
Subject: Z18 questions
thinking of buying a Z18 turbo just wanted to
check a few facts first
#1 the guy says it's still standard pistons but the head
has been shaved .040" ,what compression ratio would this make.
**The STD ratio is 8.5:1. As
far as I know the head setup is good for 20psi with no problems of
detonation, everything else needs to be up to scratch. I wouldn't be
wanting a shaved head for turbo work though.
#2 how much boost can be run through a standard
Z18 (taking into consideration the head shave) wolf 2d computer, T28 and
no intercooler. he said it's never been taken above
10psi.
**Why does it have a T28? If
the turbo is not of the T3 style then the intake and exhaust plumbing would
be different. Hard to see why they would do that, as there is nothing
wrong with a good T3 setup. The limit is around 10psi with no
intercooler, but you need to be careful of detonation. The factory
boost is set to ~7psi.
#3 the car made 176hp @ wheels on 6psi, is this
fairly average for a Z18? sounds fairly high for 6psi.
**I
don't think so. Not unless it was doing 10,500rpm. Factory boost
gets you 108kw at flywheel at 5,500rpm.
#4 a bottom end bearing has gone, would the
most cost effective option be replacing the bearing, or just dropping in
an L20 bottom end?
**If
one of the bearings is gone, then you will have to strip it down to check
what else has gone. Seems strange for just one bearing to wear out
prematurely unless there was problem with the rebuild or oil problems.
The L20B pistons will need to be flycut for the valves. Try a Z22
bottom end.
my plan was to get a Z18 and put the L20 bottom
end under it, I was interested in this one cause of the price (just
over a grand for the complete stanza) but I'm thinking now that if
the head on it's shaved I'm gunna be up for another head later if I wanna
reduce compression, so maybe there's no point buying this. Or is it
still good for the price, considering I'd get the T28, Wold2d, manifolds
etc
etc.
