Oil squirters on 2.3? 20v compression?

[Marc Swanson]

> A wile back I read something that suggested that the 2.3 (NF or NG, maybe
> both) had the oil jet to squirt the backside of the pistons. Can anyone
> confirm this?

Yes, this is true. 

> I am seriously considering getting a 2.3 and running a 7A 20v
> head with it.

Cool.  

> People have suggested this would give around 8.5:1
> compression. Does anybody have any ideas on how to figure out what the
> compression would be?

I've also speculated with others on this list that compression would be 
somewhere in that neighborhood.  Can't confirm a number though.  Why don't 
you try it and tell us how it goes ;-)


I can tell you that Paul Tingaud was running an MC lower end with a 7A top 
end resulting in roughly 6.5:1 according to him.

> Also, is the 20v head less prone to knocking? 

I don't see why this would be the case other than a change in CR.

> The
> factory runs ~9.5:1(!) compression on the UR-S4 and S6 cars and a lot of
> boost pressure is used.

They also have very sophisticated ECUs.  The S4/S6 has distributorless 
ignition (it uses coil packs:  one for each cylinder).  This might account in 
part  for why they can safely run a relatively high CR with moderate boost 
pressure.


-- 
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Marc Swanson
MSwanson Consulting

Phone:  (603)868-1721
Fax:    (603)868-1730
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mswanson at mswanson.com
http://www.mswanson.com
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