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Compression question
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Just to be clear: compression ratio is the displacement difference
between cyclinder swept volume VS the head's volume. It is not based
from atmospheric pressures.
Another point:
I don't see any reason to poke fun at people. If someone has something
to add, that is great, but "ribbing" is not very polite, especially when
it comes to insulting one's intelligence. I think we were all tought (or
should have been) that if you don't have anything good to say then
don't.
I'd rather not get pointless emails in my inbox of that nature......
Gary
Brian Wagner wrote:
> Wow he is scary smart. LOL
>
> Patrick Bureau <txrocco@sbcglobal.net> 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 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"
> > To: "Rocco list"
> > 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
> >
>
>
> _______________________________________________
> Scirocco-l mailing list
> Scirocco-l@scirocco.org
> http://neubayern.net/mailman/listinfo/scirocco-l
>
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Just to be clear: compression ratio is the displacement difference between
cyclinder swept volume VS the head's volume. It is not based from atmospheric
pressures.
<p>Another point:
<br>I don't see any reason to poke fun at people. If someone has something
to add, that is great, but "ribbing" is not very polite, especially when
it comes to insulting one's intelligence. I think we were all tought (or
should have been) that if you don't have anything good to say then don't.
<p>I'd rather not get pointless emails in my inbox of that nature......
<p>Gary
<p>Brian Wagner wrote:
<blockquote TYPE=CITE>Wow he is scary smart. LOL
<p><b><i>Patrick Bureau <txrocco@sbcglobal.net></i></b> wrote:
<blockquote style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">I
dont think you calculate piston compression and
<br>compression reatio that way..
<p>My 8v 1.8: stck ran 160 PSI on all four pistons
<br>(bentley tells 145-174 average for new engine) but it
<br>still only 8.5:1 compression ratio. (ie: 8.5 times the
<br>weight of earth's atmostphere (which is the base
<br>xx:1).
<p>VW engines which came stock in a Scirocco, or are a
<br>popular replacement
<br>Typical Name & Code Bore (mm) Stroke (mm) Year / Model
<br>available HP@RPM / TQ@RPM CR
<p>1.8L JH 8v 81 86.4 83-89 90@5500 / 100@3000 8.5:1
<br>1.8L GX 8v 81 86.4 Fox 85@5250 / 96@3000 8.5:1
<br>1.8L PL 16v 81 86.4 86.5-92 Scirocco (88 USA, 89
<br>Canada, 92 Europe) 123@5800 / 120@4250 10:1
<br>2.0L 9A 16v 82.5 92.8 90 - 92 Passats / Golfs / Jettas
<br>134@5800 / 133@4400 10.8:1
<br>2.0L ABA 8v 82.5 92.8 93-98 Golf / Jetta / Cabrio
<br>115@5250 / 122@3250 10.5:1
<p>Note that all the engines up to the first 1.8L have
<br>136mm rods, while the later motors have 144mm rods
<p>look it up on the net.. my numbers are pretty close to
<br>what it is all about.
<br>
<p>--- worldcyclist <WORLDCYCLIST@EARTHLINK.NET>wrote:
<br>> I've got some firsthand experience that might be
<br>> helpful.
<br>> My 1.8 16V with stock cam timing gave 150psi doing a
<br>> compression test.
<br>> With the cam advanced 8* it was 175psi. Otherwise
<br>> it's 10-1 in terms of
<br>> ratios.
<br>> The JH engine I had was 135psi or 8.5-1.
<br>> The Alfa with 9.5-1 gives me 173 psi with stock cams
<br>> and timing.
<br>>
<br>> An interesting site is www.smokemup.com
<br>> they have GUI programs to play with stuff like this,
<br>> plus more.
<br>>
<br>> Gary
<br>> 87 16V Scirocco (FS $975)
<br>> 80 Callaway Stage 3 Rocco
<br>> 91 Alfa Romeo 3.0 V6 5spd, lowered
<br>>
<br>> Message: 57
<br>> From: "Scourge" <SCOURGE@COGECO.CA>
<br>> To: "Rocco list" <SCIROCCO-L@SCIROCCO.ORG>
<br>> Subject:
<br>> Date: Mon, 5 May 2003 18:33:42 -0400
<br>>
<br>> This is a multi-part message in MIME format.
<br>>
<br>> ------=_NextPart_000_0007_01C31334.DABF40A0
<br>> Content-Type: text/plain;
<br>> charset="iso-8859-1"
<br>> Content-Transfer-Encoding: quoted-printable
<br>>
<br>> Hey
<br>>
<br>> Just curious, what the stock compression on 16v's?
<br>> 2.0 and 18
<br>> And what about a stock jh?
<br>>
<br>> I think it's in the high 8's or low 9's for the jh.
<br>> Does a 1.8 16v head
<br>> =
<br>> on a 2.0 16v actually increase compression?
<br>>
<br>>
<br>> thanx
<br>>
<br>> -The George
<br>>
<br>>
<br>> > begin:vcard
<br>> n:F;Gary
<br>> tel;work:541.334.8485
<br>> x-mozilla-html:FALSE
<br>>
<br>url:<A HREF="http://home.earthlink.net/~worldcyclist/index.html";>http://home.earthlink.net/~worldcyclist/index.html</A>
<br>> org:World Cyclist
<br>> adr:;;;Eugene;OR;;
<br>> version:2.1
<br>> email;internet:worldcyclist@earthlink.net
<br>> note;quoted-printable:Lots of bikes and parts for
<br>> sale=0D=0Aand=0D=0ARV- Eagle 05 Conversion for
<br>> $18,900
<br>> fn:World Cyclist
<br>> end:vcard
<br>>
<br>
<p>_______________________________________________
<br>Scirocco-l mailing list
<br>Scirocco-l@scirocco.org
<br><A HREF="http://neubayern.net/mailman/listinfo/scirocco-l";>http://neubayern.net/mailman/listinfo/scirocco-l</A></blockquote>
</blockquote>
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