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RE: Anyone have a 2117cc 16V
At 09:58 AM 11/1/2001, Fry, Larry wrote:
>Longer rods are benefitial because they put lower side-loads on pistons,
>decreasing friction and wear. Their added benefit of a decrease in piston
>speed is a moot point in our engines, since our engines are nowhere near
>critical piston speed. They also provide for reduced inertial loads (apart
>from loads as a function of pure piston speed) on pistons/pins/rods, but,
>again, outside of a pure racing engine, this means nothing to us street
>people.
Right. And to go one step back, though: Engines that are oversquare (i.e.
have a larger bore than stroke) tend to be lower-revving, higher-torque
motors. Undersquare motors (big bore, little stroke), tend to be smoother
and rev-happier at the expense of low-end torque.
...but that's just one of many, many variables.
Jason
>Larry sandiego16V
>
>
>-----Original Message-----
>From: Randy B [mailto:sirocco@telocity.com]
>Sent: Wednesday, October 31, 2001 5:37 PM
>To: chris jevens
>Cc: scirocco-l@scirocco.org
>Subject: Re: Anyone have a 2117cc 16V
>
>
>Chris,
>Thanks for the info :)
>
>Hmmm.....
>But wouldn't the taller block create slower piston speed and therfore less
>power?
>My basic understanding is that with a smaller angle (piston further from the
>centerline of crank) the speed of the piston in it's down stroke, at 90*,
>and it's upstroke, at 270* would be slower, pulling in less air (or pulling
>it in at a slower velocity). There would also be less compression because
>less air is being compressed.
>Am I even remotely correct in these assumptions???????
>
>The taller block would be smoother (probably why VW went to the taller
>setup) because of less side-load on the pistons and smaller angles for the
>movement of the 'system' to overcome. Again does this make sense?????
>
>Also, isn't rev-ability mainly a function of airflow and/or port velocity?
>
>Thanks
>Randy (wishing he had paid attention in physics class)
>
>
>
> > Randy I have been curious about the same type motor. I have been talking
>to
> > a couple people from Velocity sport tuning... they have been a lot of help
> > to me in the past, and I have found them to have a lot of truth to what
>they
> > say. The BS is at a minimum. They recommend the use of a tall block from
>the
> > later 2.0 8v crossflow motors that seemed to have taken place of the 16v
> > 2.0.
> > This would be:
> >
> > -95.5 crank (lightening of course, possible knife edging)
> > -160mm connecting rods (check the EIP website they have chromoly,
> > forged, and titanium)
> > -pistons? I havn't gone that far, but for this application I guess they
> > would custom... again Velocity has them.
> > As far as the ratio of bore to stroke... I was told by Velocity that using
> > the other older block(9A) from the later 2.0 16v motors of the early 90's
> > you wouldn't be able to spool all the way up to red line... how true? I
> > havn't had a chance to go any further with it... though they said they
>have
> > done the combination 95.5/160mm rods/Bore?(didn't ask)/tall block from a
>2.0
> > 8v, and had great success with it working ridiculously well through the
> > whole power band... sounds good to me... $$$ value?? maybe it would be
> > cheaper to go to a turbo?
> >
> > well I hope that helps you in your quest for power/speed...
> > chris jevens
> >
> > >From: "Randy B" <sirocco@telocity.com>
> > >To: <scirocco-l@scirocco.org>
> > >Subject: Anyone have a 2117cc 16V
> > >Date: Wed, 31 Oct 2001 16:45:09 -0800
> > >
> > >Has anyone built, or know someone who has, a 2117cc 16V (or 8V for that
> > >matter).
> > >I would like to find someone who has tried this succesfully or
>unsucesfully
> > >and why.
> > >
> > >JE (other?) 84mm forged pistons, Carillo (other?) forged rods, and 95.5mm
> > >TDI forged crank (knife-edged to lighten) in a 9A block (16V)
> > >
> > >I am considering finding a 90-92 GTI and doing a complete
> > >motor/fuel/motronic swap.
> > >It seems if I can:
> > >A. B. Have the head flowed and ported as needed for the proper port
> > >velocity.
> > >C. Match th correct cams
> > >D. Run ~11.2:1 compression
> > >
> > >I could have a monster of a motor with good streetability.
> > >
> > >What do you all think, need some advice here :)
> > >
> > >Thanks,
> > >Randy
> > >81 Scirocco S "Mars" - needs a bigger motor
> > >81 Scirocco S "Cosmos" - will get the TT 1847cc 8V for daily duties
> > >
> > >
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> >
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