i have this idea in mind why cant i combine the 5th and 6th ports and just make one big port has anybody dont this yet?

 

Another member on here that I know asked me the same Q.
I think why it shouldn't be done, might be because it might cause side-house weakness, among other things that Im not sure about.

But go ahead and try it, see what happens.

 

If you mean the pairs of ports in the front and rear irons its done all the time in E Production racing engines. You will lose a lot of bottom end response because of lower velocity in the ports but the top end sees some gains. I wouldn't recommend it for a street engine.

 

"yanw power" you can see pics of port done.

 

"yanw power" you can see pics of port done. it changes port timing by about 40%

 

That would be Yaw Power http://www.yawpower.com/dec2004.html

 

omg, huge port.

 

they should bridge-port it next. ha ha.

 

I wish they had posted a dyno...It's very nice work! But the thing probably doesn't make any power until 6500RPM or so. Not the best idea for the street.

 

and supra owners thought they where the only ones with dyno graphs that looked like roller coasters...

 

my friend had one of these siamesed streetports with a Holley setup and from what i remember, it seemed to do alright on the low-end. i never saw the motor before assembly, so i have no idea how large the secondaries were, but a 6-port housing is a 6-port housing is a ...

another issue is that it was a very, very long time ago and i'm sure my assessment of the car's low-end character now might be different. one thing is for certain though, it kicked like a mule upstairs!

 

does anybody have any videos of one of these idling? I want to try this on my spare motor