what apex seals to run with bridge port on a 89 motor that is turbo. I would like to run a 2 piece 2mm.

 

like can you use 2 pice or will it fall in???

 

If you're dropping seal pieces in the bridge, the bridgeport was done wrong.&nbsp You can use whatever seals you want with a bridgeport.



-Ted

 

thanks ted

 

To be exact, you can only run a secondary bridge or only one end plate bridged per rotor.

All properly done bridge ports have a matching "relief" or eyebrow cut out of the rotor housing to allow the bridge ports to get some real flow area...i.e. not be restricted by the inner edge of the rotor housing, which blocks of allot of the bridge port if not cut back.

Hence this means you can only run 2 piece or 3 piece seals only with a partial bridge, not a full bridge (assuming the porting is done right!) ...If you want to run a full bridge then you need one piece apex seals, which do not require any support of a end piece by the rotor housing surface as the are no end pieces

So to sum up.

Partial Bridge = 1 piece, 2 piece, 3 piece apex

Full Bridge = 1 piece apex

PP = any construction apex

Bad Bridge with no eyebrow "relief" in rotor housing= any constuction apex (This type of porting method is useless, If your engine builder suggests this, go to another engine builder !)

 

Which ones do you install upside down or backwards or whatever it was on the partial? The rear ones?

 

Rice is right on. I feel better using 2-piece on a partial bridge, but that is just personal preference.
The rear rotor (on top as you assemble) will have the apex seals installed upside down. This puts the corner section of the apex seals towards the center housing for both rotors. It is a very uneasy feeling putting them in upside down the first time, but it is perfectly acceptable. The hurley seals are manufactured with the smaller apex piece much larger than stock, so you may feel better using those upside down -- or just use the single piece and sacrifice some compression.

 

I knew you had to do something with them, it slipped my mind. My engine is going to be a half bridge when thins one finally wears out. I'm tired of only being able to hear a bridgeport idle on my computer

 

lol I know what you meen I keep play that video over and over again.. can't wait

 

...I thought that you could use 2 piece apex seals with a Full Bridge? I know you can't use the stock seals because of the 3rd corner apex seal falling into the primary ports, but shouldn't 2 piece apex seals clear the bridge?

 

What does a bridgeport sound like in comparison to stock? (This is actually a request for the audio file, not a verbal description).

 

This is not something I would normally do on a turbo motor, but this piqued some questions...

If I'm reading everything right, the argument for less pieces is due to the fact that the part of the apex seal is NOT supported by the side housing due to the bridgeport???



-Ted

 

I believe its for the clearance that is cut in the rotor housing.

 

I have a few .wavs of them, but I dont remember where I downloaded them.

 

https://www.rx7club.com/forum/search.php

To be specific...

https://www.rx7club.com/forum/showth...ghlight=bridge

 

If you Bridgeport a turbo motor, do you only bridge one side of each rotor? If so, which side? I thought the general idea is a Bridgeport won't work with a turbo, what do you have to do to get one to work? Is it only a small Bridgeport? Any info would be great.

 

I will upload the dyno sheet when we are done. this is on my friends car I am still working on my 3 rotor.

 

If I'm reading everything right, the argument for less pieces is due to the fact that the part of the apex seal is NOT supported by the side housing due to the bridgeport???

Not the side housing, the rotor housing. If you relieve the rotor housings to match a larger eyebrow, the apex seal corner piece will fall in to the relieved part of the rotor housing, since the corner piece is the final 1mm or so of the sliding surface of the apex seal. So if you run normal 2mm or 3mm apex seals, you can only have a relieved bridge port on one housing, and the apex seal must be oriented so that the corner piece slides up against the other housing. Or: