turboing an 8v

[drew at scirocco.cs.uoguelph.ca (Drew MacPherson)]

A "regular" diesel would be normally aspirated, not turbocharged... :)

But you are correct, mine is indirect injection (uses pre-combustion
chambers,) not direct-injection (TDI.)  Passenger car implementations of
diesel engines generally sacrifice the "ideal" diesel compression ratio
(around 16:1) for cold weather starting performance.  Computer controlled
direct injection and the resulting combustion chamber design (reduced
surface area to limit heat loss) allow for lower compression ratios on
the TDI, which in turn increases turbocharger efficiency, while still
maintaining excellent cold weather starting characteristics.  IN order to
maintain cold start capability on the IDI diesel technology, VW used a
quite high compression ratio, which in turn reduces the power output of
the engine.  Although I could shave my piston tops to reduce compression
ratio and increase power, I'm not ready to take the plunge because a) I
can't afford it, and b)  although my TD Scirocco is a summer ride, it
performs standby duty for the winter beater (in case I wrap it around a
tree or a snow plow or something.)

Drew

On Tue, 21 Oct 2003, Adrian wrote:

> Hehehe .. sounds like a TDi :P
> But TDi's only have 19:1 not 23:1
> 23:1 is just a regular Diesel :) 
> 
> Adrian C.
> Project Scirocco R2.oT - "The Turbocharged 16Valves of Fire Breathing
> Fury"
> ( 2.0L 16V T66 )
>  
> 
> -----Original Message-----
> From: scirocco-l-bounces@scirocco.org
> [mailto:scirocco-l-bounces@scirocco.org] On Behalf Of Drew MacPherson
> Sent: October 21, 2003 6:52 PM
> To: Dan Smith
> Cc: scirocco-l@scirocco.org
> Subject: Re: turboing an 8v
> 
> 
> I suppose you're so totally not interested in hearing about an 8V turbo 
> that runs 23:1 compression ratio, 12 pounds of boost and gets 50+mpg,
> are 
> you? :)
> 
> Drew
> 
> 
> On Tue, 21 Oct 2003, Dan Smith wrote:
> 
> > I've always wanted a turbo car, enough so so I got that p.o.s. Saab
> mainly because it had a turbo in it. But turbos always seem out of my
> league. However, I know a bunch of you have turbo'd 8v's and I was
> wondering just what is the cost. What parts can come from yards, what
> has to be bought, how hard is it to find yard parts and what kind of
> work does it take? I've looked at the 'kits' people have put together on
> vortex and they all seem $1000 or more. The more detailed you are the
> better. Like if you put: 4 mandrel u bends, 2 18" pieces of aluminum
> pipe - $75 that would be way helpful. Even better, anyone have a tech
> writeup on it? Just give me the low-down on what it takes to turbo an
> 8v.
> >  
> > TIA,
> > Dan
> > Always researching
> > 
> > 
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> 
> 

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