X-Mozilla-Keys:                                                                                 
Paul Yaw wrote:

Paul wrote:

James Phillips wrote:

Just wondering what the opinions are on porting for aircraft use. Is
anyone using or planning on using anything other than the stock
porting. I was wondering about the suitability of street porting or
peripheral porting.       James

I intend to use street porting on my turbo. Bruce mentioned he
did a mild street port on Tracy's new engine. It is easy
and I highly recommend it. No drawbacks for an aircraft
engine as far as I can tell. Paul Yaw mentioned something
about the stock sharp lip in there helping the BSFC as
I recall.

Paul Lamar

The best bang for the buck (Or hours of labor.) would be to use the
Turbo II rotor housings, and port the exhaust using a "Street Port"
template from Racing Beat. This will open the exhaust port 10 degrees
earlier, and close it 10 degrees later.  As for the intake, the best way
to make serious gains is to build a new manifold with mandrel bent
tubing.  This will improve the total induction airflow more than any
intake porting will. (This is only true of the 6 port motors.)  If at
all possible, keep it as long as the stock piece.  The intake ports are
quite a mess.  

I have spent hours on the flowbench trying to make
SERIOUS gains with very little luck.  Smoothing the high speed ports
with epoxy is not as beneficial as it looks.  Luckily the GOBS of port
window area make up for the poor airflow cahracteristics.  Well...sort
of.  As for the rest of the system, if you do not plan to have the
engine dyno tuned, I would suggest following what is already proven to
work.  Copy Tracy's setup.

PY

 
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