[20v] 7A vs 3B C/R

Todd Phenneger tquattroguy at yahoo.com
Wed May 7 11:04:24 EDT 2003

IF they are different its not by much.  A 1-2 cc difference will
NOT Raise your compression to 10.2.  Look at the pistons, they
are very different.  ITs visible.  You dont change compression
from 9:1 to 10:1 simply by shaving a head down or having smaller
Combustion chambers.  Besides, after Polishing the chambers
you'll remove a little material anyhow.  Or are you not
polishign them?

--- Brandon Rogers <brogers at terrix.com> wrote:
> Javad-
>  I trust you based on knowledge you've shared with the list.
> So did you
> measure the chambers yourself or have somebody do it or??  The
> guy here is
> saying he CC's the chamber and found them to be different?
> This is contrary
> to every response I got from the list, including yours.  Any
> further input
> is greatly appreciated as I'm in quandary.  I currently have a
> 7A head at
> the machinist for rebuild so I can put it on my 3B bottom end
> for transplant
> into an urq-but this guy has made me nervous....
> Thanks-
> Brandon
> ----- Original Message -----
> From: <JShadzi at aol.com>
> To: ""Brandon Rogers"" <brogers at terrix.com>; ""20V list""
> <20V at audifans.com>; <200q20v at audifans.com>
> Cc: <urq at audifans.com>
> Sent: Tuesday, May 06, 2003 9:19 AM
> Subject: Re: [20v] 7A vs 3B C/R
> This is not true, the compression he is referencing is the
> pistons, not the
> head, both the 3B and 7A have about 37cc combustion chambers.
> Javad
> >Hi guys-
> >I was talking with a local guy who is said to know a lot
> about Audi tuning
> etc. He said that putting a 7A head on a 3B bottom would have
> a higher
> compression ratio compared to normal 3B. He said it would
> increase from
> 9.3:1 to 10.3:1. This was not my understanding. Can anybody
> confirm or deny?
> TIA-
> >
> >Brandon
> >
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