Heads, blocks, and turbos

[Huw Powell]

> I'm wondering just how similar the I5s are.

very as in that they all appear to be the same casting.  That said, they 
aren't all drilled the same way.  I'm pretty sure the basics - oilways, 
waterways, major component mounting areas - are the same, but there are 
differences, for instance, mounting points for turbo oil/coolant feed 
lines might be an issue.

>  Can I throw a 20v head with an 034 EFI system and an
> exhaust manifold and turbo from a 10vt on the JT and call it good?
> (till I blow it up of course ;-)

Another difference you'll find is that some blocks are fitted with oil 
squirters that spray the back of the piston (and cool it) - typically, 
the turbo engines and the high compression 2.3's.

The JT does not have these, which I would consider a drawback to 
seriously upping the power.

Also, the 10v and 20v heads are not interchangeable except for bolting 
on to the block - you have to have the right manifolds.

That said, if you have those 10vt parts, dropping them on top of your JT 
block (saving the work of engine removal?) would probably be fun, at least.

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/