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The Z18T has bigger gudgons(spelt wrong) on the rods
Malcolm
David Costello wrote:
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 T28the 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 -----
Sent: Monday, November 19, 2001 10:09
AM
Subject: RE: Z18 questions
** See comments.
-----Original Message-----
From: David Costello
[SMTP:[EMAIL PROTECTED]]
Sent: 18/11/2001 19:18
To: [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.
Dave
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