2.3 NF block with MC-1 head?

[Alan Pritchard]

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Just want to confirm my thoughts on this for my turbo project. My engine
consists of a kv bottom end (2226) and an ng head (2309), both engines are
spec'd at 10:1 compression ratio.
KV engine: 81 Bore, 86.4 Stroke
NG Engine : 82.5 Bore, 86.4 Stroke
So capacity of each cylinder =
KV 2226/5 = 445.2
NG  2309/5 = 461.8
Therefore for both engines to have 10:1 compression ratio, at tdc the volume
above the piston must be:
KV 445.2/10 = 44.52
NG 461.8/10 = 46.18
So logic dictates that if the ng head is fitted to the kv bottom, the
compression will be lowered: so working on the fact that my 2226 engine now
has 46.18 cc above the piston at tdc gives me....
2226/5 (capacity of cylinder) = 445.2/46.18 (new volume above piston) =
9.64:1
Does this follow, or have I missed something, my goal has always been 8psi.
my head says yes, but when I posted before no one could back me up.


Best Regards,
Alan Pritchard
Network Administrator

Seaeye Marine Ltd.

Tel.  01329 289000
Fax. 01329 289001
www.seaeye.com

-----Original Message-----
From: Mihnea Cotet [mailto:mik at info.fundp.ac.be]
Sent: Tuesday, February 18, 2003 9:45 PM
To: duandcc_forums at cox.net; ben swann; JShadzi at aol.com
Cc: quattro at audifans.com; benswann at comcast.net
Subject: Re: Re: 2.3 NF block with MC-1 head?

Oh right, he was talking about making a turbo 2.3 10v.... bad idea indeed,
only maximum 5 psi are possible with some very high octane fuel and much
retarded ignition timing... However, lowering the CR a tad to say 9.5:1 and
a pretty good ignition control system would allow him to have a setup
similar to the 20vt... not a very bad idea! I'll try to look into making a
9:1 CR 10vt with a good ignition system (accurate is the word, I have the
timing values for 20vt engines so transposing these values on the 10v
engine won't be the issue, accuracy of the spark control will instead) and
a nice turbo as well... sounds like fun anyway!

Mihnea

At 16:15 18/02/2003 -0500, duandcc_forums at cox.net wrote:
>Your right, it's not the head that's the problem, it's the block. NF =
>10.1:1, same as my NG. I doubt you could run much, if any, boost through a
>10.1:1 CR engine without some pretty sophisticated engine management stuff
>(like they use on modern 1.8Ts, gost I miss my chipped passat 1.8T).
>
>Dave
>
> >
> > From: Mihnea Cotet <mik at info.fundp.ac.be>
> > Date: 2003/02/18 Tue PM 03:59:58 EST
> > To: <duandcc_forums at cox.net>, ben swann <benswann at comcast.net>,
> >  JShadzi at aol.com
> > CC: quattro at audifans.com, benswann at comcast.net
> > Subject: Re: 2.3 NF block with MC-1 head?
> >
> > Why would he? The compression ratio is given by the pistons, not the
head
> > AFAIK..
> >
> > Mihnea
> >
> > At 15:40 18/02/2003 -0500, duandcc_forums at cox.net wrote:
> > >I'm pretty sure you'd end up with WAY too high of a compresion ratio to
a
> > >turbo engine...
> > >
> > >Dave
> > >1987 CGT Special Build
> > >SE Virginia
> > >
> > >
> > > >
> > > > From: ben swann <benswann at comcast.net>
> > > > Date: 2003/02/18 Tue PM 01:32:02 EST
> > > > To: JShadzi at aol.com
> > > > CC: quattro at audifans.com,  benswann at comcast.net
> > > > Subject: 2.3 NF block with MC-1 head?
> > > >
> > > > Javad, Quattrophile,
> > > >
> > > > Just a thought.  I have an NF block and was looking into the
> > > > possibility of installing my MC-1 turbo head to have a 2.3 MC-1
setup.
> > > >
> > > > Can it be done without shaving the head or block? Issues?  Worth it?
> > > >
> > > > Ben
> > > >
> > > > [From: JShadzi at aol.com
> > > > was -Re: 80tq: Head Gasket Failure
> > > >
> > > > Just a standard one this time around, this motor is temporary but
I'm
> > > > researching using the S6 gasket in the 2.3 motor, thought the bore
is
> > > > bigger.
> > > >
> > > > Javad]
> > > >
> > > >
> > > >
> >
> >