[V8] turbo v8

[Scott DeWitt]

No the 3.6 and 4.2 heads are different, head gaskets are different. Cams are 
different, all indicating a different cylinder spacing. In Audi's 4.2 new 
product info circular it states that the cylinder spacing was increased to 
compensate for the larger bore. So I'd be willing to bet the 4.2 crank will 
not fit a 3.6.

This poses an interesting question... Unless you have a 4.2 crank lying 
around, you'll have to buy a complete engine unless you can find a destroyed 
one. Those engine's aren't exactly cheap... But wait I do have a 4.2 engine 
that has seen better days..


----- Original Message ----- 
From: <spcole at mn.rr.com>
To: <V8 at audifans.com>
Sent: Monday, August 29, 2005 7:47 PM
Subject: Re: [V8] turbo v8


> yes the interials are different but as far as i can tell the blocks are
> identical as are the heads.  I come to this conclusion due to the fact
> that the valve cover gasket and the oil pan are the same part numbers on
> both motors so that means that the piston centers are the same the heads
> are ideantical as far as outer apperance i haven't sat down and looked
> over the valves yet but the 4.2 crank should fit as far as i can tell.
>
>>The 3.6 and 4.2 are different motors internally, according to Audi. I
>>really doubt that the crankshafts will go from one motor to the other.
>>Other bad part is internal engine bits are hard to find. I'd either
>>find a 4.2 or use the 3.6, unless you want to spend several zeros
>>machining a custom crank etc. etc. etc.
>
> ----- Original Message -----
> From: spcole at mn.rr.com
> Date: Monday, August 29, 2005 3:50 pm
> Subject: [V8] turbo v8
>
>> I know this might have already been discussed in the list but i have
>> been out of town for several weeks and heard that there was an on
> goin
>> discussion and had a proposal for debate. I am the owner of a 3.6L v8
>> out of a 90 V8 this is to be the new power plant for my 91 CQ i have
>> been looking and parts for this motor and it dawned on me that if the
>> 4.2 is the same casting only bored and stroked you could make a far
>> supior 4L that would be ideal for a twin turbo application.  does
>> anyoneknow if my crazy idea would work with a 3.6L with the 93mm
>> crank and
>> 82.5mm pistons. this i belevie would be a far more durable motor then
>> the 4.2 and would be able to go to higher rpms.  if anyone knows
>> if this would work please let me know because i am seriosly lookin at
> buildin
>> this motor and runnin it normally aspirated for now but it would only
>> need a piston swap for the tt conversion and would most likly be
>> runninga coil per cylinder igintion system from electromotive.
>>
>> thanks sean
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>>
>
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> Have a V8 answer? ... Please help others by adding to the KB ... all 
> contributions welcome!