Can it be done? 20V head on a 2.3 NG?

[JShadzi at aol.com]

I think overall, with that compression, the motor would still make more power, and have much better high rpm power.  Problem is, no 20v motor was ever run on CIS, so you have not only the fabrication issues to deal with, but also whether the CIS system is flexible enough to meet the needs of the 20v motor.  My guess would be that overall, you're better off to swap a whole motor with the original fuel management system.

javad

In a message dated Thu, 2 May 2002  4:00:48 PM Eastern Daylight Time, <David.Ullrich at ferguson.com> writes:

>OK, so it CAN be done. So, is it worth it? What kind of power would it make? 8:1 CR seems low to me, but the extra valves help make up. So is a break even deal? Of less power? Coming up with custom exhaust shouldn't be a problem. So, how hard would the fueling issues be to correct?
>
>Dave
>
>1987.5 Audi Coupe GT "Special Build" 2.3 - Anthracite Black
>1998 VW Passat GLS 1.8T - For Sale CHEAP
>
>
>-----Original Message-----
>From: JShadzi at aol.com [mailto:JShadzi at aol.com]
>Sent: Thursday, May 02, 2002 3:45 PM
>To: "Brady Moffatt"; "Ken"; quattro at audifans.com
>Subject: Re: Re: Can it be done? 20V head on a 2.3 NG?
>
>
>The 10v comb. chamber is 29cc, the 20v is about 38cc, the resulting drop in compression is more like 8:1, not 7:1.  Yes, the head fits perfectly, you can even use the stock NG head gasket, the real issue is intake/exh. configuration and proper fueling.
>
>Javad
>
>In a message dated Thu, 2 May 2002  3:20:55 PM Eastern Daylight Time, "Brady Moffatt" <bradym at sympatico.ca> writes:
>
>>Yup, I'd imagine that in order to fit 2 more valves into a combustion
>>chamber, you might have to make it a bit bigger, and/or dish the pistons a
>>bit more. However, to drop the CR from 10:1 to 7:1 you'd have to add almost
>>26cc to the volume. That's a 50% increase! That seems _highly_ unlikely.
>>
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