10v -> 20v -> 20vt

[james accordino]

Yeah, your're right on all counts.  I wasn't speaking
of streetable engines per se, just building in
general.  As someone who pointed to Corky's book
previously said, you need to go low to make more top
end.  The deal is obviously the lower you go the more
it suffers at the low end of the RPM range.  As far as
"dumping fuel", again I didn't mean to mislead, just
pointing out that additional fuel beyond stoc has
benefits-primarily cooling.  Just a bit lean at high
CC pressure/temp. and you just burned a nice hole
right through the top of those $$ pistons.  Finding
the maximum CR you can run effectively requires alot
of research and $$. Turbo or NA.  It IS a delicate
balancing act.  Same as ignition lead.  Alot is really
good.  A bit too much is REALLY bad.  BTW all my
experience in these areas is with SB Chevy and is real
old.  20 yrs. +.  All experiences were low budget.  No
anaylizers or dynos.  Try something and run it.  If it
breaks, try something else.  Much more expensive with
the I-5 turbo, huh?

Thanks
Jim Accordino
--- JShadzi at aol.com wrote:
> I can't think of any street or practical application
> under 600hp where any
> compression ratio under 7:1 would be needed,
> especially in an Audi 5
> cylinder.  In fact, I don't even know how well a car
> with 6.5:1 compression
> would run, at all??
>
> Like Marc says, the highest compression ratio
> possible should be run for best
> performance.  There is a marked difference between
> the MC-1 that is about
> 7.8:1 and the MC-2 at 8.4:1.
>
> I think a lot of those out there who complain about
> turbo lag in the MC-1
> cars are really complaining about doggy response
> from a low comp. motor, the
> MC-2 has much quicker response, especially in
> transition from off boost to
> boost.
>
> As far a "Dumping in fuel", an engine will require a
> precise amount of fuel
> in any given condition, Dumping by any means should
> be avoided, precisely
> metering a higher quantity of fuel would be
> preferred  =)
>
> Javad
> 80tq.com
>
> In a message dated 11/21/2001 12:20:16 AM Pacific
> Standard Time,
> marcswanson at mediaone.net writes:
>
> << > Isn't that part of the deal if you want to run
> insane
>  > boost?   Start with real low compression?  Runs
> like
>  > sh*t down in the RPM range, but when you get it
> wound
>  > up, it rips.  Dump on lots of fuel, maybe some
> water
>  > to keep it from detonating?  Ah, I don't know.
> Anyone
>  > else?
>
>
>  I referred to Corky Bell's book for some
> information on this topic.  The
>  basic idea is to run as low a compression ratio as
> you *need* to.  In other
>  words, yes.. you can run higher boost without
> detonation at lower CR to a
>  point...  He doesn't really specify what that point
> IS, but suffice to say
>  that if the CR is too low you'll never leave the
> line!
>
>  -Marc-
>  87 4ktq
>  88 90q
>   >>


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