10V head mod qustion

[JShadzi at aol.com]

Ya, its hard to say as far as hard facts and dyno numbers, but I recommend it as a great upgrade for the money, flowing more air through the intake valve helps, expecially in a turbo motor where higher HP numbers are happening.  Ideally, a 35 or 36mm exh. valve would be a  good pairing, but aftermarket valves are expensive and tough to come by.  Sodium filled is not a necessity, in fact, good stainless valves are stronger, and with a nice wide valve seat and lack of detonation, there is really no need for it-the factory basically trying to reduce failure and increase reliability whereever they can, but not a necessity.

I notice the bigger valve in the higher RPM range, paired with a good cam, can really help open up the top end on a 10v (especially with EFI  =)

Javad
80tq.com

In a message dated Wed, 7 Nov 2001  4:38:06 PM Eastern Standard Time, ed armstrong <edshred2000 at yahoo.com> writes:

>
> Probably pretty minimal, although with a turbo the
> gain is likely more on a percentage basis of increased
> hp as compared to a normally aspirated engine. Maybe
> you will see a 5 hp increase at high rpm. Perhaps
> Javad has a better feel on this subject.
>
> The point is, if your going to rebuild the head, the
> 40mm valves cost no more than the stock 38 mm. So the
> upgrade is a no brainer. And every little increase in
> hp and flow helps.
>
>  -ed
>
> --- Konstantin Bogach
> <konstantin.bogach at morganstanley.com> wrote:
> > What is estimated performance gain from 40mm intake
> > valves mod?
> >
> > Thank you.
> >
> > Konstantin.
> >
> >
> > ed armstrong wrote:
> >
> > > I rebuilt my MC head recently and installed bigger
> > > 40mm intake valves. The head and motor are not in
> > a
> > > car yet but I think the upgrade can only help a
> > turbo
> > > motor. I don't think you can get bigger sodium
> > exhaust
> > > valves than stock. Even if you could there in not
> > much
> > > room to fit them.
> > >  -ed
> > >
> > > --- Konstantin Bogach
> > > <konstantin.bogach at morganstanley.com> wrote:
> > > > I searched archives on subject of bigger valves
> > but
> > > > I could not find
> > > > much on turbo engines. There is discussion on NA
> > > > engines but not much on
> > > > turbo.  So, what is general consensus on
> > installing
> > > > bigger intake or
> > > > exhaust valves?  Is it worthy to do that on
> > these
> > > > cars ?
> > > > Can I use not sodium filled valves in this cars?
> > > > What is a downside?
> > > >
> > > > I have neither experience nor theoretical
> > knowledge
> > > > in
> > > > technology/materials used in building heads.  I
> > use
> > > > Napoleon's tactic -
> > > > engage first then see what you can do.  I
> > engaged
> > > > already by planning
> > > > taking head off my car tomorrow.  Now... I will
> > > > appreciate if someone
> > > > point me to ABC of head rebuilding (if such
> > write-up
> > > > exists in first
> > > > place).  I also need a good source for rebuld
> > kit
> > > > for K-26.  I called
> > > > ont place - $125. Sounds like big $$$.
> > > >
> > > > Thank you.
> > > >
> > > > Konstantin Bogach.
> > > > 200tq '89
> > > > 200tqa '89
> > > >
> > > >
> > > >
> > >
> > > __________________________________________________
> > > Do You Yahoo!?
> > > Find a job, post your resume.
> > > http://careers.yahoo.com
> >
>
>
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