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

JShadzi at aol.com JShadzi at aol.com
Wed May 7 14:05:20 EDT 2003

Yes, that's correct, the 10v heads are all about 29cc or so, so that is within range.


>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