[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:
>chamber 60.9 (including recess in piston)
>piston/deck height .508
>give compression ratio of 7.2:1 so I guess 28cc is about right.
>Just my 2p worth.
>----- 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
>> 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....
>> ----- 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.
>> >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
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