Compression question

[egraffy@earthlink.net (Carpenter/Graffy)]

Plus, each compression tester reads different from the next...
Cris

At 03:59 PM 5/7/2003, Patrick Bureau wrote:
>I dont think you calculate piston compression and
>compression reatio that way..
>
>My 8v 1.8: stck ran 160 PSI on all four pistons
>(bentley tells 145-174 average for new engine) but it
>still only 8.5:1 compression ratio. (ie: 8.5 times the
>weight of earth's atmostphere (which is the base
>xx:1).
>
>VW engines which came stock in a Scirocco, or are a
>popular replacement
>Typical Name & Code Bore (mm) Stroke (mm) Year / Model
>available HP@RPM / TQ@RPM CR
>
>1.8L JH 8v 81 86.4 83-89 90@5500 / 100@3000 8.5:1
>1.8L GX 8v 81 86.4 Fox 85@5250 / 96@3000 8.5:1
>1.8L PL 16v 81 86.4 86.5-92 Scirocco (88 USA, 89
>Canada, 92 Europe) 123@5800 / 120@4250 10:1
>2.0L 9A 16v 82.5 92.8 90 - 92 Passats / Golfs / Jettas
>134@5800 / 133@4400 10.8:1
>2.0L ABA 8v 82.5 92.8 93-98 Golf / Jetta / Cabrio
>115@5250 / 122@3250 10.5:1
>
>Note that all the engines up to the first 1.8L have
>136mm rods, while the later motors have 144mm rods
>
>look it up on the net.. my numbers are pretty close to
>what it is all about.
>
>
>--- worldcyclist <worldcyclist@earthlink.net> wrote:
> > I've got some firsthand experience that might be
> > helpful.
> > My 1.8 16V with stock cam timing gave 150psi doing a
> > compression test.
> > With the cam advanced 8* it was 175psi. Otherwise
> > it's 10-1 in terms of
> > ratios.
> > The JH engine I had was 135psi or 8.5-1.
> > The Alfa with 9.5-1 gives me 173 psi with stock cams
> > and timing.
> >
> > An interesting site is www.smokemup.com
> > they have GUI programs to play with stuff like this,
> > plus more.
> >
> > Gary
> > 87 16V Scirocco (FS $975)
> > 80 Callaway Stage 3 Rocco
> > 91 Alfa Romeo 3.0 V6 5spd, lowered
> >
> > Message: 57
> > From: "Scourge" <scourge@cogeco.ca>
> > To: "Rocco list" <scirocco-l@scirocco.org>
> > Subject:
> > Date: Mon, 5 May 2003 18:33:42 -0400
> >
> > This is a multi-part message in MIME format.
> >
> > ------=_NextPart_000_0007_01C31334.DABF40A0
> > Content-Type: text/plain;
> >         charset="iso-8859-1"
> > Content-Transfer-Encoding: quoted-printable
> >
> > Hey
> >
> > Just curious, what the stock compression on 16v's?
> > 2.0 and 18
> > And what about a stock jh?
> >
> > I think it's in the high 8's or low 9's for the jh.
> > Does a 1.8 16v head
> > =
> > on a 2.0 16v actually increase compression?
> >
> >
> > thanx
> >
> >  -The George
> >
> >
> > > begin:vcard
> > n:F;Gary
> > tel;work:541.334.8485
> > x-mozilla-html:FALSE
> >
>url:http://home.earthlink.net/~worldcyclist/index.html
> > org:World Cyclist
> > adr:;;;Eugene;OR;;
> > version:2.1
> > email;internet:worldcyclist@earthlink.net
> > note;quoted-printable:Lots of bikes and parts for
> > sale=0D=0Aand=0D=0ARV- Eagle 05 Conversion for
> > $18,900
> > fn:World Cyclist
> > end:vcard
> >
>
>
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