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

[abatzis2@hotmail.com (Michael Abatzis)]

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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