13B BP 6-port irons with 12A housings
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13B BP 6-port irons with 12A housings
I am building a N/A bridgeport hybrid engine for my 85 gen1.
How should I do with the waterseal jacket?
Fill the rotorhousings jacket with Dewcon??
Would that work if I get the surface flat?
How should I do with the waterseal jacket?
Fill the rotorhousings jacket with Dewcon??
Would that work if I get the surface flat?
#4
Bridge Port Freak
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I would say give it a shot. After all the BP housings are what you want to protect. Just us a light dab of silicone along with the rings just to protect against surface imperfections of the epoxy. It should hold up for a couple thousand miles...(read 15-20)
Good luck.
Good luck.
#5
Stu-Tron Get Yo Groove On
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He means devcon.
If you are porting past the water seal, run your coolant line normally but cut it before/after the seal and steak it down, so it will not pull into the chamber and flood it with coolant. You can fill in the water jacket and remaining coolant groove with the devcon. When the devcon has dried, and you are puting the engine together, run a bead of silicone sealant around the port, attching the 2 ends of the coolant seals together.
Picture is for devcon reference
If you are porting past the water seal, run your coolant line normally but cut it before/after the seal and steak it down, so it will not pull into the chamber and flood it with coolant. You can fill in the water jacket and remaining coolant groove with the devcon. When the devcon has dried, and you are puting the engine together, run a bead of silicone sealant around the port, attching the 2 ends of the coolant seals together.
Picture is for devcon reference
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Sorry! I have to make it clearer...
I will build the engine with 12A rotorhousings and use 13B 6-port irons from a N/A -88.
The water seal grooves on one of the parts need to be filled with Devcon, or something else that will stay in shape when the parts will get warm.
I will not port passed the groove, but it will be a BP. I think the 6-port irons will give me the flow I need without monsterport. I want the car to be possible to use on the street...
I will build the engine with 12A rotorhousings and use 13B 6-port irons from a N/A -88.
The water seal grooves on one of the parts need to be filled with Devcon, or something else that will stay in shape when the parts will get warm.
I will not port passed the groove, but it will be a BP. I think the 6-port irons will give me the flow I need without monsterport. I want the car to be possible to use on the street...
#11
Lapping = Fapping
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Don't bridge the aux ports. Rotarygod will send you flies and boils if you do.
I believe Devcon will hold up well in the irons so you can purchase the cheaper '85 and older coolant seals that fit in the rotor housings.
There is an aux port casting "lump" in the way on the 6 port front plates right where the front counterweight spins. You will need a late 12A rotating assembly whose front counterweight already has a nice 45° bevel like the FC front counterweights. Yes Mazda was thinking ahead and did actually make a 6 port compatible 12A rotating assembly. I'm building a 6 port 12A myself soon and researched this. Plus I know they were sold in Europe.
I believe Devcon will hold up well in the irons so you can purchase the cheaper '85 and older coolant seals that fit in the rotor housings.
There is an aux port casting "lump" in the way on the 6 port front plates right where the front counterweight spins. You will need a late 12A rotating assembly whose front counterweight already has a nice 45° bevel like the FC front counterweights. Yes Mazda was thinking ahead and did actually make a 6 port compatible 12A rotating assembly. I'm building a 6 port 12A myself soon and researched this. Plus I know they were sold in Europe.
#12
Stu-Tron Get Yo Groove On
iTrader: (4)
Don't bridge the aux ports. Rotarygod will send you flies and boils if you do.
I believe Devcon will hold up well in the irons so you can purchase the cheaper '85 and older coolant seals that fit in the rotor housings.
There is an aux port casting "lump" in the way on the 6 port front plates right where the front counterweight spins. You will need a late 12A rotating assembly whose front counterweight already has a nice 45° bevel like the FC front counterweights. Yes Mazda was thinking ahead and did actually make a 6 port compatible 12A rotating assembly. I'm building a 6 port 12A myself soon and researched this. Plus I know they were sold in Europe.
I believe Devcon will hold up well in the irons so you can purchase the cheaper '85 and older coolant seals that fit in the rotor housings.
There is an aux port casting "lump" in the way on the 6 port front plates right where the front counterweight spins. You will need a late 12A rotating assembly whose front counterweight already has a nice 45° bevel like the FC front counterweights. Yes Mazda was thinking ahead and did actually make a 6 port compatible 12A rotating assembly. I'm building a 6 port 12A myself soon and researched this. Plus I know they were sold in Europe.
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280.5 hp on the flywheel...
The front one on the pic is the one I made, the rear where the customers broken...
It's a 1984 12A,
Last edited by Arvika; 08-22-09 at 03:53 AM. Reason: more info
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#19
Old Fart Young at Heart
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Personally, I'd run 13B housings with 12A end irons, both from 1st gens. Another option is building an NA TII. If you do run 6 port end irons, bp the aux ports only and have working 6th port actuators if you want to keep any semblance of low end torque for street driving.
Devcon may work, for a while, if you must mix and match 1st/2nd gen housings and irons. Another option is Lab Metal, pricier but should hold up better. There's a guy on nopistons.com that explains how to deal with the coolant seals if you go with a monster bp that cuts into the seal groove. That site seems to be offline atm or I would give you his name. However, I have yet to see anyone even remotely recommend building an engine with 2 coolant seal grooves.
Devcon may work, for a while, if you must mix and match 1st/2nd gen housings and irons. Another option is Lab Metal, pricier but should hold up better. There's a guy on nopistons.com that explains how to deal with the coolant seals if you go with a monster bp that cuts into the seal groove. That site seems to be offline atm or I would give you his name. However, I have yet to see anyone even remotely recommend building an engine with 2 coolant seal grooves.
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