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16v head on a 1.7L engine



Right on, Dan. Thanks for the real numbers. :^)
--
Scott F. Williams
NJ Scirocco nut
Golf GTI 16v rollycar
Mazda 323 GTX turbo assaulted vehicle
'99 Subaru Impreza 2.5 RS (coming soon)
ClubVAC: "Roads found. Drivers wanted."

Check out our rally team's website!
http://www.usrallyteam.com

> -----Original Message-----
> From: Dan Bubb [mailto:jdbubb@ix.netcom.com]
> Sent: Friday, January 11, 2002 8:08 AM
> To: Scott F. Williams
> Cc: Allyn; jester@westfailure.net; Jerry Carter; Scirocco List
> Subject: Re: 16v head on a 1.7L engine
> 
> 
> OK! I couldn't help it. I did the math. I made some assumptions:
> 1. 16V combustion chamber is all in the head, which is substantially
> true.
> 2. 8V combustion chamber is 36CC (volume of the chamber in the head
> only), which is a number I remember from somewhere.
> I come up with 7.3:1 CR for a 16V head on a 1.7 L 8V block. Plus, I bet
> you'd have to clearance the pistons for the intake valves and maybe even
> clearance the block a little bit for the intakes since the bore is only
> 79.5mm instead of 81mm.
> blah, blah, blah.....
> Dan
> 
> 
> "Scott F. Williams" wrote:
> > 
> > Mr. Reiger wrote:
> > >     Yea, but enough to drop THAT low???
> > > Al
> > 
> > Sure, the 8v head/16v bottom end combo yields about a 14:1 CR. 
> This is 4:1
> > higher than a 1.8l 16v, for instance. Plopping the 16v head on 
> a 1.7l motor
> > will have the reverse effect. You do the math. :^)
> > --
> > Scott F. Williams
> > NJ Scirocco nut
> > Golf GTI 16v rollycar
> > Mazda 323 GTX turbo assaulted vehicle
> > '99 Subaru Impreza 2.5 RS (coming soon)
> > ClubVAC: "Roads found. Drivers wanted."
> > 
> > Check out our rally team's website!
> > http://www.usrallyteam.com
> > 
> > _______________________________________________
> > Scirocco-l mailing list
> > Scirocco-l@scirocco.org
> > http://neubayern.net/mailman/listinfo/scirocco-l
>