Is it possible or has it been done to combine or oval out the 5th and 6th port runners with the lowers on the outside irons. Just to oval out the two cylander runners into one big oval port. Combining the two , making a 4 port out of a 6 port? Just a thought.. Don't know if it has been done or not, but came up with the thought when I saw a 6 port bridgy Iron and all those ports and thought why not just make two. Although I am aware that some modifications to the coolant passage might need to be made depending on the size of the port. Who knows I might just pull out one of my many **** irons and try it.
Let me know if anyone has heard or knows of this being done. I would sure like to see and or hear about it. Thanks, Robert.

 

It's been done many times over.

 

Sweet I might give it a go. any pics of this?

 

There are a few pics floating around the board. If I remember right, Mazdatrix ran that setup on one of their race cars.

 

TRY looking up yawpower.com they did a engine that way

 

If you're not constrained by rules forbidding adding material to the ports or runners, it might be a really good idea to, after hogging out the space between the 5th and 6th ports, close a lot of it back down with devcon and work an actual smooth transition. The cross-sectional area's going to get way strange in places otherwise, though I know that the EProd 13Bs make pretty decent power despite the transition...

 

If you are not doing this on a street car and only on a race car that has a close ratio transmission that allows you to shift at 10K rpm then by all means go ahead. If you want to do this to a street car and/or still have a stock transmission then don't do it. You'll be slower! There is no point in a porting style that has it's sweet spot at a point where your transmission isn't geared to take advantage of it. Just revving it up there anyways doesn't exactly work that well. If it's a street car, I'd think of a better option. If you are still using a stock intake manifold or computer then stay away like it's the plague. That also applies to bridgeporting.

 

And be prepared to spend a lot of time with the die grinder!

 

here. here. it's one the most exhaustive porting jobs i've ever done.

 

Has Any one ever tried to boost on this style of port?

 

Im acually doing this style port with a big turbo setup and megasquirt. I started out with adding material. My buddy made a metal slug to put in the 5th and 6th ports. basicly not hollow actuator sleeve. Then I cleaned it all back out. It is a very very time consuming port job.

How high do you think the rpm band will be with the ports that big and a turbo? 10k still?

 

+1

Anyone?

Chris

 

would love to see pics of that plate!!!

 

i've done this also... the tiring part is cutting out the material in the runners to make them one...

porting the area on the face of the plates isnt so bad. but still takes much longer than a street port.

 

Enlarging the 2 ports into one (from the intake) will compromise the strength of the plates. Making a mega port has never proven successful, better to get 4 port plates and bridge them. Here is a bastard port on a 6 port vs a nice bridgeport. Believe it or not, this plate came off a running engine.

 

i don't understand this statement. it's been done and documented. granted, i don't know the ultimate fate of the engines running those ports because i don't own one personally, and the one that i had personal link to was sold several years ago. however, i can verify that they successfully run, and run pretty hard, too.

but you're very correct in stating that that first photo represents one that was not done right.

 

They're pretty damn successful in EProd... I really don't think that's "never".

 

With stock intake and/or ECU this would be true. This is a really nice port where PPort and BP are not allowed or where you would like high rpm performance with less over lap than a BP.