Types of Peripheral Port Housings
#26
Exhaust Manifold Leak
w ceramic seals the chrome does not wear. the only what the housing suffer is shrinking in width on the combustion side, and cracks forming around the plug holes. I think if you would run a low temp thernostat it could reduce the speed at which both propagate. In the old day people ran no thermostat and the thermal cycling more then likely didnt help.
#27
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@j9fd3s
I know this is an old thread, but I've got to pick your brain on this as I've come across some NOS MFR 13B housings.
Is there any documentation on the longevity of the MFR housings since they don't have a liner? Older irons must be used?
I know this is an old thread, but I've got to pick your brain on this as I've come across some NOS MFR 13B housings.
Is there any documentation on the longevity of the MFR housings since they don't have a liner? Older irons must be used?
not sure about longevity, you will see old housings get like a "scaling" of the chrome surface
i would imagine these would be the 4801-10-100 part number, which is probably the most common one
i'm also not sure what apex seal you'd want to use, basically anything they sold was for carbon seals
its pretty cool though!
#28
@j9fd3s
I know this is an old thread, but I've got to pick your brain on this as I've come across some NOS MFR 13B housings.
Is there any documentation on the longevity of the MFR housings since they don't have a liner? Older irons must be used?
I know this is an old thread, but I've got to pick your brain on this as I've come across some NOS MFR 13B housings.
Is there any documentation on the longevity of the MFR housings since they don't have a liner? Older irons must be used?
Ceramics have less friction, but I think they're harder and designed to work with the steel lining in a housing.
#29
Exhaust Manifold Leak
Used ceramics for few seasons on them. No wear at all after 25-30 hours 9000 rpm shifts on the chrome.
only as I mentioned they develop cracks around the plugs and slow but steady shrink in width around the plugs
from a tribological aspect theyre superior to factory housings as the cracked surface keeps oil in it much better then the ones w steel liner. Its a bit like a sputter type bearing
only as I mentioned they develop cracks around the plugs and slow but steady shrink in width around the plugs
from a tribological aspect theyre superior to factory housings as the cracked surface keeps oil in it much better then the ones w steel liner. Its a bit like a sputter type bearing
Last edited by Rub20B; 05-04-24 at 01:51 PM.
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#30
What gave me the idea that MFR p-port rotorhousings were a viable base for any NA power goal was seeing old images like this.
It looks like almost an unlimited canvas for p-port as there is so much material around the ports.
43mm rally port VS 55mm track port both based off MFR casting.
It looks like almost an unlimited canvas for p-port as there is so much material around the ports.
43mm rally port VS 55mm track port both based off MFR casting.
These ports are giving me MAJOR feelings of inadequacy. LOL
#31
Used ceramics for few seasons on them. No wear at all after 25-30 hours 9000 rpm shifts on the chrome.
only as I mentioned they develop cracks around the plugs and slow but steady shrink in width around the plugs
from a tribological aspect theyre superior to factory housings as the cracked surface keeps oil in it much better then the ones w steel liner. Its a bit like a sputter type bearing
only as I mentioned they develop cracks around the plugs and slow but steady shrink in width around the plugs
from a tribological aspect theyre superior to factory housings as the cracked surface keeps oil in it much better then the ones w steel liner. Its a bit like a sputter type bearing
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#33
I would think one could prolong the run time before cracks propogate with radius/polishing the plug hole, trying to limit rotor housing temps and limiting the speed of thermal swings of the rotor housings.
Possible means to do so-
Tuning with very capable ignition system and specialized expansion scavenging exhaust (can you run richer afrs with same power?).
Cooling grooves cut in water jacket on combustion side.
Coldest plugs that stay lit.
Copper threaded insert for spark plugs.
Retain T-stat for slower thermal cycling.
Might be easier to develop a way to repair cracked rotor housings?
Possible means to do so-
Tuning with very capable ignition system and specialized expansion scavenging exhaust (can you run richer afrs with same power?).
Cooling grooves cut in water jacket on combustion side.
Coldest plugs that stay lit.
Copper threaded insert for spark plugs.
Retain T-stat for slower thermal cycling.
Might be easier to develop a way to repair cracked rotor housings?
#35
Exhaust Manifold Leak
I would think one could prolong the run time before cracks propogate with radius/polishing the plug hole, trying to limit rotor housing temps and limiting the speed of thermal swings of the rotor housings.
Possible means to do so-
Tuning with very capable ignition system and specialized expansion scavenging exhaust (can you run richer afrs with same power?).
Cooling grooves cut in water jacket on combustion side.
Coldest plugs that stay lit.
Copper threaded insert for spark plugs.
Retain T-stat for slower thermal cycling.
Might be easier to develop a way to repair cracked rotor housings?
Possible means to do so-
Tuning with very capable ignition system and specialized expansion scavenging exhaust (can you run richer afrs with same power?).
Cooling grooves cut in water jacket on combustion side.
Coldest plugs that stay lit.
Copper threaded insert for spark plugs.
Retain T-stat for slower thermal cycling.
Might be easier to develop a way to repair cracked rotor housings?
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djSL (05-06-24)
#36
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or since they have no liner, its just aluminum with the chrome sprayed on it, maybe we can cast our own.
i suggested billet housings to Elliot at turblown like 15 years ago, but if you did billet rotor housings the billet was more money than just buying an REW housing from Mazda.
i suggested billet housings to Elliot at turblown like 15 years ago, but if you did billet rotor housings the billet was more money than just buying an REW housing from Mazda.
#37
Exhaust Manifold Leak
Unless you want a period correct racecar I would also just start from a production housing. Ideally a gsle one that is most suited to run without exhaust sleeve.
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j9fd3s (05-06-24)
#39
Thanks for all the information, folks. Maybe I'll just sell the housings I came across. Since I already have a peripheral port but no spare engine, I was going to build one with these housings. However, if longevity is an issue (my car is street driven), then I probably won't want to use the MFR housings.
#41
Red Pill Dealer
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I would think one could prolong the run time before cracks propogate with radius/polishing the plug hole, trying to limit rotor housing temps and limiting the speed of thermal swings of the rotor housings.
Possible means to do so-
Tuning with very capable ignition system and specialized expansion scavenging exhaust (can you run richer afrs with same power?).
Cooling grooves cut in water jacket on combustion side.
Coldest plugs that stay lit.
Copper threaded insert for spark plugs.
Retain T-stat for slower thermal cycling.
Might be easier to develop a way to repair cracked rotor housings?
Possible means to do so-
Tuning with very capable ignition system and specialized expansion scavenging exhaust (can you run richer afrs with same power?).
Cooling grooves cut in water jacket on combustion side.
Coldest plugs that stay lit.
Copper threaded insert for spark plugs.
Retain T-stat for slower thermal cycling.
Might be easier to develop a way to repair cracked rotor housings?
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