Snip

Mike I am doing the same type of porting to my 6 port 13B.

Would

you have

any additional photos of your 6 port modifications showing

more

interior

detail of the port?

     Thanks
     Kelly Troyer
     Dyke Delta/13B

Unfortunately no.  I bought the engine running this way and have not

had

it apart myself.  You can probably get more info at Pineapple Racing,

they

are the ones who built the engine.   http://www.pineappleracing.com/

Mike

Mike McGee, RV-4 N996RV, O320-E2G, Aurora, OR
13B in gestation mode

Snip

  Mike I am interested in the 6 port entrance mods where the metal

between

the ports is removed, not the interior port mods (if any).

  Thanks

      Kelly Troyer
      Dyke Delta/13B

That is interesting. What is your reasoning Kelly?

Paul Lamar

  Paul
   From what I can tell from Mike's photo it looks like the divider wall
between the port openings has been removed entirely to some depth. My port
openings have been ported to a "D" shape and the web between the ports
ground to a knife edge at the face of the housing.

 Kelly Troyer

I guess that will work but I think if you remove the divider completely
you will improve the flow because the skin friction from the
bottom of the top port and the top of the bottom port will
go away. You will also pick up a bit of port area. Of course
you will have to disassemble your engine and you may not want to
do that. The advantage of no divider at all over what you have
may be small. What is your psru ratio?

Paul Lamar

  Paul
     "2.85 Ross (unfortunatly)"
  Kelly Troyer

Not necessarily. The early ones seem to be fine and it is easy to add
a gear thrust bearing. The 2.85 ratio is a plus particularly if
you have bigger ports with lower air velocity :-)>

Paul Lamar
 
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