[urq] WX head build recommendations

[Thatcher Hubbard]

The explanation for the MC being a more powerful fealing engine versus
the WX/WR that I usually get is that the WX/WR has such a low
compression ratio -> 7.0:1.  The MC-1 is somewhat higher, and the MC-2
even higher than that.

The low CR of the WX/WR can be great if you're looking to smack a huge
turbo onto the engine and run a ton of boost, but if this is a "mild
street engine" that's probably not the case.  I'm doing an EFI
conversion on my totally stock WX, but my first step toward running a
"tuned" engine will be to replace the WX with an MC-1.

On 4/22/05, Louis-Alain_Richard at computerhorizons.com
<Louis-Alain_Richard at computerhorizons.com> wrote:
> 
> 
> Steve,
> I was with Brady last night: we discussed the merit of some 10V heads and
> we have a few questions for you:
> Is it possible to bolt an MC head on the WX block ?
> If not, what are the options for a mild street engine with a custom EFI
> setup ?
> If he must keep the WX, then what are the drawbacks of this head with
> regards to cam, valves, flow, lifters, etc ?
> 
> Thanks in advance,
> 
> Louis-Alain
> 
>              Steve Eiche
>              <seiche at shadetree
>              software.com>                                              To
>              Sent by:                  bradym at sympatico.ca,
>              urq-bounces at audif         urq at audifans.com
>              ans.com                                                    cc
> 
>                                                                    Subject
>              2005-04-21 12:20          Re: [urq] WX head build
>                                        recommendations
> 
>              Please respond to
>              seiche at shadetrees
>                 oftware.com
> 
> 
> Brady,
> Before you go ordering big valves, etc.  It would be wise to pull the head
> and have it pressure tested.  WX heads are prone to cracking, which is
> terminal.  Good WX heads are rare as hens teeth.  I might go so far as to
> recommend spending your money on an MC engine, which will give you longer
> life, especially once you turn up the boost.
> 
> Just my .02
> 
> Steve
> 
> Brady wrote:
> 
> Hi All,
> 
> It's been awhile, but now that my home computer seems to be working again,
> I'm back. And it's good to be back!
> 
> It looks like I'll have to pull the head on my 83 urq very soon since the
> car puffs sweet-smelling white smoke on startup. The oil and coolant are
> both clean, and, for the moment, there are no other signs of impending
> doom.
> The dry compression test, on a cold engine that had sat all night, yielded
> the following:
> Cylinder 1: 117psi
> Cylinder 2: 130psi
> Cylinder 3: 105psi
> Cylinder 4: 130psi
> Cylinder 5: 122psi.
> 
> I've already ordered the ARP head stud kit, and I'm wondering if anyone
> knows for sure if a 3B/AAN head gasket will work on a WX. Also, should I
> have bigger valves fitted? Anyone have a WR cam for sale??
> 
> The car is currently running 1bar boost on a stock
> intake/turbo/engine/exhaust manifold, and is controlled by an 034efi Stage
> IIc ECU. In the future, I'll turn up the boost, so I'd like to build a
> strong head while it's open.
> 
> Suggestions?
> 
> Cheers, Brady
> 83 urq, 60,000miles
> 86 4kq, 361,000km
> 72 240Z, 165,000miles
> 
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