engine questions

[JShadzi at aol.com]

Nate, to my knowledge all MC motors have the same size valves, and all 10v heads have the same size exh. valve, 33.3mm without exception.  Some later NG/NF motors came with 40mm intakes vs. 38, but that's the only valve size changes.

There is no real advantage to using the MC2 head over MC1, but the MC2 bottom end will give you a more responsive yet more detonation prone motor.

Javad

>
>Does the MC-2 have larger exhaust valves?  I have a head with the larger
>exhaust valves, and since I am gonna be pulling the motor apart to put new
>rings, seals, and bearings in I could put a head on it with larger exhaust
>valves, or swap turbos.  Does anyone have any ideas?   of how I should put
>this all together?
>
>I have complete MC-2
>I have complete MC-1 minus #4 piston due to hole, and minus head due to
>spark plug reaming out the hole on removal
>
>I have a head from a 4kq with the larger exhaust valves.
>
>Any ideas will be helpful.
>
>Nate
>-----Original Message-----
>From: Jim Green
>To: Richard Hoffman; Nate Beck; quattro at audifans.com
>Sent: 10/6/2003 6:50 AM
>Subject: Re: engine questions
>
>
>--- Richard Hoffman <billzcat1 at hotmail.com> wrote:
>> There are some ECU differences (MAC10, 11, etc) but
>> I don't know too much
>> about that.  I know the MC2 got the smaller K24
>> turbocharger to improve
>> spool up and turbo lag.
>
>
>Yea, you'll need the MC-2 ecu or it will knock all
>over the place or you'll be running in constant retard.
>
>=====
>Jim Green
>'89 90tq 034EFI Stage II
>http://www.mswanson.com/~jgreen/car_home.html
>
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