And it looks like you were intending on bridging that?? Good god...

As far as porting the manifold, you don't really have to take off much material. The key is to make the runners as smooth as possible. The important points are the interfaces between the upper and the lower, and between the lower and the block. You want to make sure the runners are the same shape and size so that there isn't any lip on the inside for the air to catch on. I used the gaskets as templates to match the runners. Ideally, sanding off the rough casting would be a good idea as well, but that's much harder to accomplish.

Whether or not that is actually worth any power, I don't know.

 

Oh, so I'm just making sure that there isn't anything to stop a consistant flow. I bet this does something. I may "port that".

 

This is just a pic I saved from the net, not my work or anyone I know.

 

I hope the guy that did that 6port to 4port w/BP didnt use that totally F**Ked up Iron, look how many times he jumped onto the iron face.

Here is one of my port jobs, i called it the Frankienstien, you where able to turn the BP's off and on, it worked out pretty well, but the exhuast was a little bit to big i think. This was very early in my porting days

 

I like that idea!

 

here's a s4 upper ported intake

 

I don't think I'll try bridgeporting just yet. Thanks for that cool porting job!

 

lots of good info in this thread!!!

 

sorry to the o.p. nice ports what template are you using for exhaust?


but to rx7 13bnut ;what was the power gains on aux port bridged ? where they working or open
what was the setup for engine as in was it carbed or efi standalone?

 

I'm using the Pineapple racing exhaust ports advertised on their website. The EP1A. I'll have it up soon, I still have to remove the sleeves(out of gas on welder, don't know how flux core will do on buds harbor freight kind).

 

I removed the exhaust sleeve on my N/A housing. I kept breaking the weld(even when I turned it), so I grinded the pins out. To one his own.

I grinded out the restrictive wings also, but I got a little greedy with the ramp, so I don't know if the open space between the exhaust port and the sleeve matters because, its on the exhaust port. Also attached are pictures of the Exhaust port(part1). The material comes off really fast, faster than on the side housings! I haven't ported to the scribed line because I'm trying to keep it straight and consistent; I will bevel the edges when I get to the line. This is the EP1A Exhaust port from Pineapple Racing, it is huge. I'm being careful on these because they may be re-useable.

 

do you have pictures of the opposite face of the exhaust sleeve????

 

One of the pics I uploaded eariler shows the clearence between the sleeve and the housing.

 

you going to block the EGR holes/passages?

 

I don't think I am. Is this the device that recirculates the exhaust gas back through the intake(Exhaust Gas "Recirulator")? I may, just to keep the intake air cool.

 

yes, that's it. i was just curious because you have the sleeves out and it reminded me that i am contemplating it for my next engine. some people do, some people don't. i haven't actually looked for solid data on how much of a difference it makes yet though.

 

I have both S5 and S4 intermediate irons. The S5 has the EGR basically blocked. I'll take a picture of them side by side.

 

S5 vs S4, S5 has the EGR blocked from the factory, and thats the one I ported.

 

It was a friends setup, he was using a MegaSquirt to run the motor, he was using a stock turbo setup with High Compression Rotors. It really wasnt worth it.

 

Quick progress, I have to remove the other exhaust sleeve and port the other iron. Than port the housings and irons I'll be using in the final engine. Oh, the housings I'm porting are still in spec(under average with one of them chrome flaking very little). I'm still boggling the idea of getting TII sleeves or use the un-diffused sleeves. I found roll pins at a hardware store, so I'm going to grind the others out.

 

How much wheel horse power are expecting?

 

Some. I read and hear that people get 200hp on a streetport, but this is achieved with race rotaries(mostly) that barely go under 9000RPM. They are carb'd and use a single primary port, like the TII. And I digress...

So, I hope to get at least 170hp with working 6 ports. I'm not worried about how much power yet until I start tuning.

 

You should have no problem with 170.

 

I've seen engine dyno sheets that show 267 BHP on a 6 port street port race motor, from an EP car. That should be around 230-235whp for a race setup. I would think 200whp is possible on a street setup.

 

save yourself the hassle and get the turbo inserts, then if you want to go nuts polish them and or ceramic coat them.