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

Keith Lloyd spot.ontheroad at virgin.net
Wed May 7 18:46:19 EDT 2003

When I rebuilt my WR I cc'd the head and have record showing them to be
The figures were:
bore 79.934
chamber 60.9 (including recess in piston)
gasket thickness1.7
piston/deck height .508
stroke 86.4
give compression ratio of 7.2:1 so I guess 28cc is about right.
Just my 2p worth.

Keith Lloyd
----- Original Message -----
From: "Brandon Rogers" <brogers at terrix.com>
To: <JShadzi at aol.com>; ""20V list"" <20V at audifans.com>;
<200q20v at audifans.com>
Cc: <urq at audifans.com>
Sent: Wednesday, May 07, 2003 4:26 PM
Subject: [urq] Re: [20v] 7A vs 3B C/R

> 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
> 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
> 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
> 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
> 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
> TIA-
> >
> >Brandon
> >
> _______________________________________________
> 200q20v mailing list
> 200q20v at audifans.com
> http://www.audifans.com/mailman/listinfo/200q20v
> _______________________________________________
> Audifans urq mailing list
> Send posts to: mailto:urq at audifans.com
> Manage your list connection: http://www.audifans.com/mailman/listinfo/urq

More information about the 200q20v mailing list