[tech]: compression ratio: 9a vs. pl

[marc_scirocco@yahoo.ca (Marc scirocco Québec)]

Not so fast buster, I am almost done converting a 9A
motor to the kingdom of 8V.
 
muhahahahaha

 --- Michael Abatzis <abatzis2@hotmail.com> a écrit :
> get yer jh-3a-8v crap out of here! this is a 16v
> thread :P !
> 
> 
> 
> >From: pbureau@attbi.com
> : Tue, 07 May 2002 22:59:34 +0000
> >
> >JH/3a yeilds about 9.5:1 if head shaved, you can
> get 9.8-
> >10.1:1 maybe
> >
> >--
> >====
> >ATS - Patrick Bureau
> >1985 8v Euro GTX 3A/JH Project
> >1988 16v Euro GT Project
> > > So what does the compression wind up being when
> you mate a 1.8 head to a 
> >2.0
> > > block?
> > >
> > >
> > >
> > > Joshua Hignight
> > > Student Services/IT Services Coordinator
> > > (505) 821-4800 ext. 2116
> > >
> > >
> > > -----Original Message-----
> > > From: Michael Abatzis
> [mailto:abatzis2@hotmail.com]
> > > Sent: Tuesday, May 07, 2002 3:34 PM
> > > To: scirocco-l@scirocco.org
> > > Subject: RE: [tech]: compression ratio: 9a vs.
> pl
> > >
> > > >From: "Scott F. Williams"
> <sfwilliams@comcast.net>
> > >
> > > > > how high a cr can you
> > > > > run w/o blowing headgaskets/pinging,
> > > >
> > > >I'd be nervous to run anything more than 11.5:1
> on the street. Ability 
> >to
> > > >reach even that point requies some high-octane
> fuel. A healthy 
> >combustion
> > > >chamber (no glowing carbon deposits or other
> problems), proper engine
> > > >fuel/ignition mapping, and adequate cylinder
> head cooling should permit
> > > >this
> > > >CR on 94 octane.
> > > how much needs to be taken off a stock head to
> get this cr?
> > >
> > > >
> > > > > hmmm--this is actually a thread that hasn't
> been beaten into the
> > > > > ground before, has it?
> > > >
> > > >I don't think that the CR topic has been beaten
> into the ground at all. 
> >In
> > > >fact, I was just sweating about the same thing.
> See the recent thread
> > > >entitled "Cincy: hotrod plans/what to do?
> ACK!". I was considering the
> > > >purhase of a motor that supposedly had a 12:1
> CR. It turns out that the
> > > >ratio is actually higher. Thus, I'm passing on
> the deal.
> > > >
> > > >P.S. The difference in CR between PL and 9A
> motors is due to the 
> >different
> > > >bore and stroke -not a larger combustion
> chamber volume in the PL. The 
> >9A
> > > >bottom/1.8l head combo is demonstrably faster
> than a 9A bottom/2.0l 
> >head
> > > >set
> > > >up.
> > >
> > > i've got a 2l/1.8 that begs to differ--are there
> any actual dyno reports
> > > showing a difference, or just that flow graph
> (at tt?) that shows
> > > intake/exhaust flow?
> > > -michael
> > >
> > > >--
> > > >Scott F. Williams
> > > >NJ Scirocco nut
> > > >'99 Subaru Impreza 2.5 RS
> > > >Mazda 323 GTX turbo "assaulted" vehicle
> > > >Golf GTI 16v "rollycar"
> > > >ClubVAC: "Roads found. Drivers wanted."
> > > >


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