Common sense engine upgrades

[jdbubb@ix.netcom.com (Dan Bubb)]

We have got to stop this "use diesel pistons with a 16V head"..."use 8V
pistons with a 16V head"..."use 16V pistons with an 8V head" bullshit! 90%
of the time this is a non-starter anyway because of piston pin height in the
piston, BUT....
Combustion chambers are designed to provide the required CR, squish area,
valve area, minimal valve shrouding, turbulence for efficient burn rate,
minimal surface area for thermal efficiency and minimal emissions.....blah,
blah,blah.....
The top of the piston is the bottom of the combustion chamber and there are
many more issues than CR to have an effective combustion chamber!
You can do a mix and match if you have enough sense to avoid piston to valve
collisions and piston to head collisions, but it isn't going to be even
close to optimum!
What the hell is the point of putting a turbo on an engine, adapting the
fuel and ignitions systems to support this, then bastardizing the whole
effing thing with a combustion chamber that has a CR that is too high or too
low because you used some POS pistons that you had laying around that have
poor turbulence and burn rate because the squish area is lost, long burn
rates because the combustion chamber is the whole diameter of the piston
instead of being centrallized, that is all MORE prone to knock than if you
had just bothered to get a piston with the right CR that was made for the
application.
Being cheap is one thing. Being stupid is another.

I'm thinking that  pistons from a Honda B18A would be the ticket for my high
reving 8V!!
Dan
Not picking on you Dave! Just the perverbial straw......

----- Original Message -----
From: Dave Ewing <rabbit16v@prodigy.net>
To: Scirocco List <scirocco-l@scirocco.org>
Sent: Friday, January 11, 2002 10:34 PM
Subject: Re: 16v head on a 1.7L engine


> This would work OK and I have actually been thinking about a 1.6L 16v race
> motor but you would have to do two things.  First, you would have to do
what
> Scott explains below (welding the oil return hole then surfacing the
head),
> then you would either have to use deisel pistons to up the compression or
it
> would be a great base for a turbo!!  HTH!!
>
> Dave
>
> > Nope, no you wouldn't. :^) In order to fit the 16v head to the earlier
> > block, you have to weld shut some of the oil return holes in the head.
> Thus,
> > it is a one way trip. Just drop the 2.0l 8v motor in there with a big
> valve
> > head and call it a day.
> > --
> > Scott F. Williams
> > NJ Scirocco nut
> > Golf GTI 16v rollycar
> > Mazda 323 GTX turbo assaulted vehicle
> > '99 Subaru Impreza 2.5 RS (coming soon)
> > ClubVAC: "Roads found. Drivers wanted."
> >
> > Check out our rally team's website!
> > http://www.usrallyteam.com
> >
> >
> >
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>
>
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