[T3] FW: Secondary oil cooler

["Erkson, Toby" <toby.erkson@intel.com>]

My comments below.
   Toby Erkson
   air_cooled_nut@pobox.com  <-- Please use this address for email
   '72 VW Squareback 1.6L bored and stroked to 2.0L, Berg five-speed
   '75 Porsche 914 1.8L, ORPCA member
   Portland, Oregon, http://www.geocities.com/MotorCity/8501/

>-----Original Message-----
>Well, I took a look a t your "stats" and it's an impressive list of
>parts.   It looks like you have a good combination that should provide
>years of enjoyment.  I was particularly impressed with you mileage
>figures.  Is this a daily driver?

Thanks.  It's been expensive too, but I entered it knowing that and I
actually
enjoy myself.  Yes, she's definitely a daily driver.  My purpose is to have
a
performance, daily driver.  FI would put me in my "total satisfaction"
category
but that's an expensive modification at this time.  The mileage became
better
when I went to the stock R&P, 1st and 2nd gears.  Previously I had a tranny
custom geared for speed and my mileage figures were down by five points --
yuck!
 The Jacobs computerized ignition really, truly does help improved the
mileage.

>What compression ratio and deck height are you running?   This engine is
not
>that big and the stock oil
>cooler should be adequate unless your compression ratio is too high and
>causing higher than normal head temps.

I disagree:  a 2.0L is a big engine when it's supposed to be less than
1600cc
(stock size)!  Compression ratio is 8.0:1.  I don't know the deck height.

>I suggest that you check that
>CR and if it's higher than 7.5:1, bring it down.  You will lose some HP
>but you won't have all that plumbing to do or that cutting of bumpers.

I know about CR -- hp loss would be less than 10hp, roughly.  No bumpers so
no
cutting needed :)

>The fact that you have a 5 speed should have no affect on your engine
>temps.  I think that your 5th gear is a bit taller than stock and that
>might have you running a bit higher temps at speed.  But you are also
>running tires that are not stock circumference, so that would also
>factor into the equation.

Yes, the 5th gear is a tad taller than stock which certainly doesn't help
the
engine work at optimum cooling capacity during long runs.  I put a lot of
study
into building the tranny and designed an Excel spreadsheet to assist me.
I've
factored in tire height into the formulas because I know how it can affect
speed
and cooling.  You can download it from my Type Three Tech page at
http://www.geocities.com/MotorCity/Speedway/1641/

>It would not be time wasted if you spent a weekend driving around and
>measruing your engine temps and ... I think that the stock cooling system
is
>deliberately over
>built/engineered and can adequately handle much higher performance than
>stock provided that CR's are kept in check for a daily driver...

I agree.  However, why limit my hp because of compression when I can adjust
cooling issues with a thermostatically controlled secondary cooler in a
proper,
full flow system?  I've already pushed the engine beyond its design and as
such
must make compensations to the other systems as needed.  It is very common
to
see built Porsche engines (air-cooled variety that I'm familiar with) that
have
secondary oil coolers and it makes perfect sense.  More hp, more heat, and
it
has to be dissipated some where, some how.

Just to set things straight, I do have a pretty good idea what I'm doing and
everything you've mentioned I already know.  I am by no means an expert
engine/tranny builder -- I leave that skill to the experts -- but I do
consider
and use my builders advice, as well as others.  Trouble is, everyone has an
"expert" opinion and it's up to me to filter the good and the bad.  That's
not
easy when I have several expert opinions.  I also have several manuals and
other
documentation (including the Gene Berg stuff) and I read every post by Parks
and
Adney because knowing how the stock systems work help me when I get into my
modified systems.  I also know that whatever I do may be met with
disagreement
but everyone, again, has their opinion.  My work is researched and I don't
do it
blindly.

However, I still value input from others and it's nice to know that there is
another person out there who is familiar with the ups-n-downs of big engines
:)

Thanks!
        Toby Erkson

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