Corner seal has about 1/4 of its body supported. I love this type of large streetport only on secondary side housings for street cars.

I wanted to let other members know that this type of port while it works lovely and makes awesome power it could only be used with 2 piece 2mm apex seals or 3mm apex seals. The port is so large that it will swallow a 3 piece 2 mm apex seal. The 3 piece 2 mm apex seal is divided in half and the inner half of the seal will not be supported by the large port. Did I say wild?

To give you more of a professional answer, I installed the rotor housing and Rotor with the corner seal on and measured. I see half of the corner seal being supported by what is left of the port wall. Surely Xtreme porting. I will be using solid corner seals and a 2 piece apex seal. I remeber making this type of port for a 12A engine I use to run in my street car back in 1988 and when does secondary ports kicked in I was like WHAT!!!!!!!!!!!! felt awesome power and nice G-force. I have another engine running this type of port. I build the engine in 1997 and the engine is still running strong(has not been taking apart since 1997) car made 327 rwhp on 10lbs of boost on a 1988 turbo II using the factory Rx7 computer with bigger secondary injectors, stock intercooler stock fuel system and To4-e turbo we bought for 100.00 bucks. This turbo II ran a best time of 12.2 @117 mph at 10lbs of boost. Xtreme porting But yes nice power indeed.

holy ****. Thats awesome! So basically you put the rotor in the housing, marked off where half the corner seal was still supported and then ported it out? Wouldnt that put an extreme amount of pressure on the apex seal? Im very interested in this port, since im going to be spooling a big turbo, i want as much gas flowing as possible.

I would say, because only the ends of the apex seal is expoxed to the opening of the port there is no concern. Besides that, the ends of the apex seals are being exposed to the coldest part of any engine cycle that the seal is involved with. No worries about pressure. Remember apex seal could withstand some serious combustion pressures. They just don't like detonation.

You doing your homework and being able to understand what your getting yourself involved with is purely intelligent. I would advise to anybody to do as much homework as possible before taking on a job like rebuilding an engine. Basically you want to take away all the guessing and work with facts that have proven performance and reliability. what type of 3mm clearance are you asking me about? there a few of them.

To give you more of a professional answer, I installed the rotor housing and Rotor with the corner seal on and measured. I see half of the corner seal being supported by what is left of the port wall. Surely Xtreme porting. I will be using solid corner seals and a 2 piece apex seal. I remeber making this type of port for a 12A engine I use to run in my street car back in 1988 and when does secondary ports kicked in I was like WHAT!!!!!!!!!!!! felt awesome power and nice G-force. I have another engine running this type of port. I build the engine in 1997 and the engine is still running strong(has not been taking apart since 1997) car made 327 rwhp on 10lbs of boost on a 1988 turbo II using the factory Rx7 computer with bigger secondary injectors, stock intercooler stock fuel system and To4-e turbo we bought for 100.00 bucks. This turbo II ran a best time of 12.2 @117 mph at 10lbs of boost. Xtreme porting But yes nice power indeed. [/quote]

Cool, I guess I judged the pics wrong.

The 4 650cc injectors will tune the all motor set up then a 250 nitrous oxide shot https://www.nopistons.com/forums/pub...#>/biggrin.png will tune the rest of the engine.. landind me that 500hp Xtreme NA stuff but Im going for the record.

Wow! https://www.nopistons.com/forums/pub...1047683894.gif Does a port like that affect idle? Thats the most incredible port ive ever seen.

Idle tries to stabilize but every once in a while you'll get the lump in the idle. Something like this. ---------^-------------^----------------^---.