2.1 Liter 16V.... Which Crank will do it????

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

I don't have any specific data on piston pin height. But it should be
obvious that the deck height (crank main bearing centerline to top of block)
minus 1/2 the stroke minus the rod length would leave X distance from the
piston pin centerline to the top of the block. If you change one of these
dimensions something else will have to change to keep the correct piston to
head clearance. I don't want to be ignorant, but if you can't visualize this
you really shouldn't be dicking around with major engine components.
If you increase stroke without changing rod length or piston pin height the
piston will most likely hit the head.
If you decrease stroke without changing rod length or piston pin height the
piston will be down the bore at TDC and you will have a lower CR (and of
course less displacement). Probably too low of a CR for even a turbo motor.
Erik Patterson did a COMPLETE analysis of this applied to a 16V in a list
posting on February 16, 2002 at 2:17PM titled "Figuring compression".
Dan

----- Original Message -----
From: Allyn <amalventano1@comcast.net>
To: <jdbubb@ix.netcom.com>; DAN <sciroccodriver@yahoo.com>
Cc: <scirocco-L@scirocco.org>
Sent: Monday, March 18, 2002 3:18 PM
Subject: Re: 2.1 Liter 16V.... Which Crank will do it????


> Whered you get these pin height numbers from? Im not saying they are
wrong, im saying i want some
> piston tech info!
> Al
>
> ----- Original Message -----
> From: "Dan Bubb" <jdbubb@ix.netcom.com>
> To: "DAN" <sciroccodriver@yahoo.com>
> Cc: <scirocco-L@scirocco.org>
> Sent: Monday, March 18, 2002 2:27 PM
> Subject: Re: 2.1 Liter 16V.... Which Crank will do it????
>
>
> > I think the next step up is a 1.9 diesel crank with a 95.5 mm stroke.
> > With your pistons that would net 2067cc.
> > BUT, there is one problem. The pistons you have (which are presumably
> > for a 92.8 mm stroke) will have the wrong piston pin height for the
> > 95.5mm stroke and will stick out the top of the block .053" more than
> > they do now.
> > There seems to be a common misconception among alot of people on this
> > list that if you want a longer stroke you just drop in a bigger crank
> > using the same rods and pistons. Then the piston will just go little
> > farther up the bore and as a bonus you also get an increase in
> > compression. But, the fact is that the piston to head clearance on these
> > engines as they come from the factory is already a reasonable minimum
> > and you cannot increase stroke without either using a shorter rod, using
> > a piston with a different piston pin height or machining the top of the
> > piston (if you think it will be strong enough afterwards!).
> > It's also necessary to keep in mind that you need ~1mm piston to head
> > clearance measured statically. When the engine's running at 6000 RPM
> > crank, rod and piston stretch will use up that 1mm and allow the piston
> > to come very close to the head.
> > Just trying to educate a little and prevent unnecessary expense.
> > Dan
> >
> > DAN wrote:
> > >
> > > Here's what I'm thinking... I've already got a 2.0L
> > > block that I've been drooling over for 2 or 3 years.
> > > I've already got biggger pistons to get me up to
> > > 2008cc which I've also been drooling over for years.
> > > I think I might as well find the crank that'll give me
> > > 2.1 liters since I'm already going that far.  Can
> > > anybody share pros/cons... DALE??  Also, let me know
> > > what bottom end I need to source out for the crank and
> > > possibly any identifying #'s on the crank just in case
> > > I happen to have the right one in my garage already
> > > from past parts conquests.  Spanks very much!
> > >
> > >
> > > =====
> > > Dan May - Greensboro NC
> > > 1992 16V Passat
> > > 1987 16V Scirocco
> > > 1979 Scirocco
> > > 1972 Harley Davidson Rapido(Handlebars WANTED!)
> > > http://members.aol.com/scirocco87
> > > "I thought I wanted a career... turns out I just wanted
aychecks."  -unknown
> > >
> > > __________________________________________________
> > > Do You Yahoo!?
> > > Yahoo! Sports - live college hoops coverage
> > > http://sports.yahoo.com/
> > >
> > > _______________________________________________
> > > Scirocco-l mailing list
> > > Scirocco-l@scirocco.org
> > > http://neubayern.net/mailman/listinfo/scirocco-l
> >
> > _______________________________________________
> > Scirocco-l mailing list
> > Scirocco-l@scirocco.org
> > http://neubayern.net/mailman/listinfo/scirocco-l
>