Gearhead

iTrader: (1)

Has anyone ever tried to bridge a 6P housing? I was just looking at the closing duration and it seems that a 6P would close much later than a street port could be made to. The most radically ported car I have driven was a Peripheral w/factory PP housings, so I know how it ran. It looks like a bridge 6P housing would have like 450 degrees of duration on the intake or so. I was also thinking about cutting the wall out between the main and aux port on the housing. Of course this engine will be running typical large turbo equipment, and will obviously be a track only car. I was also thinking of making some PP housings, but I was going to try this first. Thanks for any info.
Don.

Gearhead

iTrader: (1)

Anyone? Surely some of you aussies have tried this. I know I'm not the first one to think of this.

RICE RACING

Have run a 6 port bridge in a N/A application and it was very good compared to a normal 4 port bridge run by same team.

I have not done a back to back test though, also did not machine it out to make one big secondary either.

Not much of an answer for you, but it worked very well in N/A tune.

crispeed

I know a lot of people cheating in SCCA with secondary 6-port bridges! It works very well and they idle like stock if you leave the sleeves in!
Whatever you do don't make the stock ports into one huge port. Everybody I know of that have done that said it ran a lot worse that way. I guess it have something to do with the velocity plus you can't actually port the bridge between the upper and lower ports all the way to the port floor because it's hollow in the back and you will break into the water jacket!

crispeed

Gearhead

iTrader: (1)

Thanks very much. I am going to build my friend's engine, and he wanted to make good N/A power because he sold his TII. I'm about to build another Turbo engine, and I was contemplating using 6port irons because the upper lip of the aux ports is so high. I kinda had an idea that the flow would be off with the big port.
Cris, are you saying that only the aux ports are bridged... like a .75" long bridge port? Did they cut the rotor housings to match? Thanks for the info guys. I knew I could count on the 2 of you.
Don.