Yeah, try not to go too far toward the inside of the motor. Going up is what you really want to do.

Porting the engine is just where you enlarge both the intake and exhaust ports. It allows for more airflow. More CFM=more power.



When using 3 mm apex seals on a rotor made for 2 mm seals you have to cut the apex seal groove so the wider seals will fit. This is done on a milling machine. 3 mm seals are usually more durable, but they don't seal quite as well as 2 mm seals. I like my 3 mm seals.

do they make more durable 2 mm seals than the stock ones? do these make the life of the engine longer?

Apex seals aren't the only part of the engine that fails. There are other companies that make 2 mm seals besides Mazda. I wouldn't know which is better as the only seals I have ever used were either Mazda 2 mm or Hurley 3 mm.

I spoke to Peter today about this. He says that mazda's stock 2mm apex seal is the best one there is. . Ray his head tech runs 643 rwhp on stock 2mm apex seals and hasn't broke one yet.He and Peter both swear by them. Since mine are fine, I checked them on a straight edge to make sure that they are not bowed out. I will just reuse them. He also told me that on any reman they stock apex seals are always reused and only get replaced if they are not up to spec. So they are not replaced just for the sport of it. If ya catch my drift.

Ok ace13b answered but here is mine. Porting involves opening the intake and/or the exhaust ports on the housings. The are three general types of ports

Street port

Bridge port

Periphial port



The street port is the most common. This basically involves opening up the in take a little on the top and botom. This is done by cutting away the alluminum by hand using a pnuematic rotary tool and a few Carbide burrs.

I learned that is is uncommon and unnecessary to open the exhaust ports any on a street car i.e. on stock turbos. Otherwise you will get boost creep most likely and will have to port oyt the wastegate opening in the turbo manifold to try to even things out a bit if you will.



I think generally your average street port adds apx. 30% more hp on the engine.





Notice the difference between the stock port and the "street" ported housing.

Yeah, that's what I've heard too, BUT the 3 mm seals are better for us "seat of the pants" tuners. That's literally how I tuned my car. https://www.nopistons.com/forums/pub...#>/biggrin.png

I hear that. Peter said only a ping is a ping! A good ping will take out 2mm and 3mm.

That's probably true. I may try a 2 mm motor in the future, but for now I'll stick to the 3 mm I already have. https://www.nopistons.com/forums/pub...#>/biggrin.png

Yea I wouldn't change it now.

I got some pics in the works guys. I just need the patch cable.