[DML] Re: Head mods

["captain_hydrogen" <captainhydrogen@xxxxxxx>]

Dave is right about there being many more performance options in 
Europe. Martin Gutkowski at www.delorean.co.uk may be able to guide 
you in what you are looking for and provide a source for better 
engine internals.

As far as porting and polishing heads, I know that just about any 
machine shop can do it, there is one here in Mesa, AZ that says they 
can do it for about $300, but if you want a source that you are more 
familiar with, then you may want to contact:

(listed in alphabetical order by vendor name)

www.deloreanmotorcenter.com - Don Steger has a very cool and crazy 
cam shaft, but also had head work done. His car is using the 
performance exhaust from www.delorean.com and pulls solidly from idle 
to over 7,000 rpm.

www.specialtauto.com - John Hervey has some performance options 
including porting and polishing of heads via core exchange. He is 
also selling DeLorean specific headers that any muffler shop can add 
cats, muffler, and tips to.

In my own research using the current parts catalog for Mahle, the 
original piston manufacturer for the PRV-6 engines of the erra that 
our engines were made, I found the following in terms of PRV-6 Volvo 
equivalent:

Mahle is the original manufacturer for the PRV-6 piston/sleeve/ring 
assembly and provided:

North American Market Volvo B28F Mahle part # 037 62 90 with 8.8:1 
compression ratio.

European Market Volvo B28E Mahle part # 037 60 90 with 9.5:1 
compression ratio.

Both version utilize the same crank and rods.

What I suggest doing is getting the piston/sleeve/ring assembly for 
the B28E, Mahle part # 037 60 90. Utlize John Hervey's head porting 
exchange program. Get Don Steger's crazy cam (also an exhange piece). 
Then get the exhaust system of your choice.

www.specialtauto.com (not sure where on the web site the headers are, 
but they are available right now with ceramic coating.)

www.delorean.com/pexhaust.asp (tried and tested, not sure if it is 
stainless or ceramic)

www.stainless-exhaust.com/discuss.htm (please contact Rob Grady 
(www.pjgrady.com) to order and with issues concerning which level of 
exhaust tone to recommend, 'cause this system is LOUD!!!)

There is a custom exhaust system in the AZ-D with shorty headers 
designed and developed Club Mechanic - Ryan Gould. It is currently in 
use on Daniel Fox's EFI converted DeLorean.

With the above mentioned mods you would have a free-breathing engine 
with 9.5:1 compression ratio and a hot rod cam that idles a little 
rough, but screams when you hit the "GO" pedal.

Just my $0.02.

Thank you,
Ben Feguson
Arizona DeLorean Club, Car Cruise Director - VIN 10365

--- In dmcnews@xxxxxxxxxxxxxxx, "David Teitelbaum" <jtrealty@...> 
wrote:
>
> Because of the way the PRV engine was manufactured there is not a
> whole lot to be gained by porting and polishing. It is not built 
like
> a traditional American motor with mismatched ports, rough castings,
> protuding flashing, etc. That said, it can't hurt either, just don't
> expect much. You cannot increase displacement by just changing
> pistons. That would involve "boring and/or stroking". Boring is
> another way of saying increase the diameter of the cylinders (which
> does mean changing the pistons) and stroking means changing the
> crankshaft for more piston travel. Boring and stroking the PRV is 
not
> easy in the US, we do not have easy acess to the parts. This engine
> was a lot more popular in Europe. You would have to guess what parts
> to try. It could take a lot of trial-and-error. DMCH did this and 
they
> call it their "Stage II" crate engine. On the outside it looks 
pretty
> stock except for the exhaust. It does produce more power than stock
> but not a whole lot more. This is a great upgrade if you have to
> replace a motor anyway (because you melted it from a failed coolant
> system for instance).
> David Teitelbaum
> vin 10757
> 
> 
> 
> --- In dmcnews@xxxxxxxxxxxxxxx, "Steve Brodsky" <ASNAKEINTX@> wrote:
> >
> > Anyone have any experience/advise regarding head 
polishing/porting to 
> > get a little better performance? How about some larger 
displacement 
> > pistons?
> >
>









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