rotor housing and iron differences
hello guys how do you tell the difference between:
s4 and s5 na housings s4 and s5 na irons and s4 and s5 na rotors the easiest and quickest way thanks for the help guys |
Rotor housing identification: http://www.banzai-racing.com/faq_housings_ID.htm
Rotor housing differences: http://www.rotaryresurrection.com/2n...g_differs.html |
thanks all i need now is the rotor and iron difference and ill have it made :)
|
we've posted this before, several times...
S4 rotors = cast combustion recess s5 rotors = machined combustion recess the S4 center iron has a round freeze plug below the intake ports, and an EGR on top, the S4 and S5 t2 center iron has an extra threaded bolt hole above the intake ports. the S5 NA has neither. the S4 and S5 rear housing are basically identical, except that the S5 has only 1 bolt hole for the top mount starter and the S4 has 2. this is to clear the NA intake. the S5 also has a different thread for the temp gauge sender. the front irons i think the only difference is the water pump housing has the spacers machined into it, so they are interchangeable. |
Originally Posted by j9fd3s
(Post 10985398)
we've posted this before, several times...
S4 rotors = cast combustion recess s5 rotors = machined combustion recess the S4 center iron has a round freeze plug below the intake ports, and an EGR on top, the S4 and S5 t2 center iron has an extra threaded bolt hole above the intake ports. the S5 NA has neither. the S4 and S5 rear housing are basically identical, except that the S5 has only 1 bolt hole for the top mount starter and the S4 has 2. this is to clear the NA intake. the S5 also has a different thread for the temp gauge sender. the front irons i think the only difference is the water pump housing has the spacers machined into it, so they are interchangeable. Also, the bolt pattern of all FC rear irons is identical...there are no changes due to starter location etc. as you've mentioned above. |
Originally Posted by invinciblerx
(Post 10988295)
Also, the bolt pattern of all FC rear irons is identical...there are no changes due to starter location etc. as you've mentioned above.
i've seen S4 irons with the same oring as the S5, so it might matter when the S4 iron was made. if its made in 1986 it should be the early style, if it was made in 2006 it should be the late style. |
1 Attachment(s)
pic of starter flange. engine is an FD, but the S5 is the same, it has one bolt hole on that flange, which is for a top mount starter. the S4 and earlier engines have a second threaded hole on the other side...
|
its best known as the clutch inspection plate cover,, no SD engine has a top mount starter OEM
|
Originally Posted by j9fd3s
(Post 10988419)
pic of starter flange. engine is an FD, but the S5 is the same, it has one bolt hole on that flange, which is for a top mount starter. the S4 and earlier engines have a second threaded hole on the other side...
Originally Posted by bumpstart
(Post 10988912)
its best known as the clutch inspection plate cover,, no SD engine has a top mount starter OEM
|
I'm wondering if the exhaust port holes on the differnt housings are differnt size and timing. I'm also curious on the spark timing specs. Anyone have any info on those?
|
Originally Posted by GrossPolluter
(Post 10989277)
I'm wondering if the exhaust port holes on the differnt housings are differnt size and timing. I'm also curious on the spark timing specs. Anyone have any info on those?
86-88 housings all had conventional plug hole location, 89 and later housings have the leading plug hole positioned 3mm lower in the housing. Though it is a matter of debate, I do not consider this to be a "timing" change, as timing is still controlled by the ecu relative to rotor position. I consider it to be a "position" change only, similar to changing the position/placement/angle of a plug in a cylinder head. In either case, the plug hole relocation doesn't affect how the engine runs, you can switch back and forth between versions or use either version in either type of engine build, as long as you use a set of matched housings, and not mix one housing with old plug location and one housing with new plug location. |
Ah, thanks! So I guess doing a na build would buy turbo housing if they were to buy them new.
Not I'm wondering how bad na build would be with 13bt housing and irons but with high computation rotors. Wouldn't that be like a FB 4 port build? |
Originally Posted by GrossPolluter
(Post 10991999)
Ah, thanks! So I guess doing a na build would buy turbo housing if they were to buy them new.
Not I'm wondering how bad na build would be with 13bt housing and irons but with high computation rotors. Wouldn't that be like a FB 4 port build? Cost wise? Performance wise? What are you saying? Rotors now have computational abilities? :scratch: :lol: |
its probs best put that the US 86-88 turbo and NA engine has the unconventional leading plug position
this position is same as used on the MFR housings but no where else the leading plug is closer to the centerline of the compression side of the housing oz/jap and other markets have the odd location ONLY for the 86-88 NA the non US 86-88 turbo ( n318 ) engine has the same positions as the the s5 and FD the spark plug position change has minor implication to the timing lead in used , and especially the split |
Originally Posted by invinciblerx
(Post 10992581)
Define "how bad an NA build would be".
Cost wise? Performance wise? What are you saying? Rotors now have computational abilities? :scratch: :lol: I heard the fb 4 port irons were some of the best. I forgot, but I heard it was because there is a lot of material that allows for a good amount of porting. So I'm wondering how a 13bt would do built NA. Comparable to an old 4 port 13b na. |
Originally Posted by GrossPolluter
(Post 10995861)
Oops I'm using my cell phone. Darn swype! I meant to spell compression.
I heard the fb 4 port irons were some of the best. I forgot, but I heard it was because there is a lot of material that allows for a good amount of porting. So I'm wondering how a 13bt would do built NA. Comparable to an old 4 port 13b na. |
Still hqve the housing ?
|
Hey guys, I'm rebuilding my S5 13bt and the rotor housings may be bad. I can get a good price on some S4 turbo housings. With the different holes and everything, could I use the S4 houses on my S5 engine and S5 TMIC? Thanks.
Sorry for bringing an old thread back to life and yes I read everything on here, I just want to be safe as I can not risk wasting more money on my rebuild. I already got screwed when I bought the engine online :/ haha |
Originally Posted by Tyler3
(Post 11708640)
Hey guys, I'm rebuilding my S5 13bt and the rotor housings may be bad. I can get a good price on some S4 turbo housings. With the different holes and everything, could I use the S4 houses on my S5 engine and S5 TMIC? Thanks.
Sorry for bringing an old thread back to life and yes I read everything on here, I just want to be safe as I can not risk wasting more money on my rebuild. I already got screwed when I bought the engine online :/ haha |
Originally Posted by j9fd3s
(Post 11708723)
the S4 housings have no place to put the knock sensor, and the spark plugs move, so you need to use pairs. (one s4 and one S5 is bad)
|
Yes you can. Provided everything is in good shape. I would recommend taking some real nice photos of the insides of your rotor housings and show them to Ben [RotaryEvolution]. He just refinished mine and they look absolutely incredible. I'll post pictures in my thread when I get back to building it.
The way I have understood it, as long as everything is in pairs/sets [ie. rotors, housings, irons, stat gears, counterweight(s)/flywheel], ALMOST everything is interchangeable. More experienced guys will be able to be more specific on this. |
you can, if you use a pair of S4 housings, you'd also have to move the knock sensor to the front of the center iron where the S4 turbo engine places it.
|
Thank you everyone
|
ASs for the rear plates , My S5 t2(not thicker or reenforced) just cracked . Can I replace it with a thicker ans reenforced S5 NA plate ????
|
no..NA plate is 6 port
|
So I hate to revive this again but I'm looking at some rotors here. They have cast compression divots but have 12 roll pins around the stat gear. I thought only S4 rotors had 9 and only S5+ had 12. How do I know if they are NA vs turbo?
|
s4 rotors have all the fixing pins, but is still cast surface in the bath
s4 turbo ones often have a visible "I" strike dimple in the bath ( clean off the carbon ) and the bath is fractionally wider than the NA one ie. measure the straight section at the top of the bathtub, not including the curved shoulders the turbo rotors are about 30 mm along the top ( or inside well ) of the bath and the NA one is about 25 mm |
Thanks bumpstart. What I originally thought were some S5 rotors turned out to be S4 TII
|
for a turbo buildup.. s4T rotors are preferred by many .. they are stronger under boost
s5 rotors where lightened by thinning out and moving the supporting ribs under the rotor surface mild detonation , while often not enough to break aftermarket seals often dents the s5 and FD rotors between the bath and the rotor tips |
That's interesting to know. My S5 franken-motor has a REW rotating assy inside so I'll keep that in mind when I gp to boost it. Also want to run on propane but that's a different convo for a diff day unless you want to pm me.
|
there are a couple of JDM shops that mill the S4 rotors down to 8.3:1 for high hp turbo builds.
|
My rotors might just be NA.
|
Rotors are indeed 9.4:1.
Irons sold but everything else available! Come and get it! I have a UIM and exten mani also! |
I have some Frankenstein rotor housings.
They are definately S5 NA housings but they do not have the spot for the knock sensor but the plug holes are in the correct S5 location. |
Originally Posted by jjwalker
(Post 11798747)
I have some Frankenstein rotor housings.
They are definately S5 NA housings but they do not have the spot for the knock sensor but the plug holes are in the correct S5 location. |
Originally Posted by lduley
(Post 11799007)
Euro or jdm possibly?
I stopped by the shop where my engine was being overhauled and they showed me the new rotor housings they where going to use. I wanted to see what the difference was between the spark plug location for my own curiosity, so I put my old housing right up next to the new one and sure as shit the holes where in the exact same locations. They say "hiroshima blah blah" on the top whereas my old ones don't say anything. |
Well i would think the "hiroshima" wouldn't mean jack cause they were built at the Hiroshima plant IIRC
|
Perhaps in the same context is is strange that the ones he already has don't have those castings on them.
For example, last year I sold a set of rotor housings which instead if just a Mazda logo cast in the plug side, they said Mazda Aviation Division, and they did not have the Hiroshima castings. I had never seen anything like it before. |
maybe they are S4 turbo housings...
https://www.rx7club.com/2nd-generati...-s4-t2-816116/ Bumpstart posted lots of info in this thread and if I am reading correctly, S4 Turbo housings have the S5/S6 spark plug locations but still lack the knock sensor casting. Too bad the pics no longer work. EDIT: i read a little bit further and there are oddball S5 NA housings without the knock sensor hole and some oddball housings for the S4 turbo that have the S5 spark plug holes. |
3 Attachment(s)
mazda aviation division i suspect means they where made for mistral engines/ beech aircraft for airborne 13b or 20b's
kinda surprised you lot havent twigged, and made a run on the avail mistral thick 20b centreplates and cranks next .. get your head around the fact that the US is the exception to the rule ( i know that may be hard for those that think the USA is center of the known universe.. but once you do that leap of faith .. , then housing design sequence becomes rather easy to follow ) the s4 turbo housing in all other countries except the US has same locations for leading plug as s5T ( and s5 NA ) housings but there is no spot for the knock sensor usually there is hiroshima patent writing in bossed font on top of housing .. later replacement housings built to this spec will lack this font these are known as n318 housings indeed this number is cast into them near the oil injector hole your US s4T housing with the odd location is known as n332 .. \because you are the odd man out.. you are actually the minor market .. i would expect that availability of n332 housing batches at times dwindles while they can order an n318 housing.. or an n370 housing ( both the same, but that knock sensor hole ) or an n350 housing ( s5 NA ) ( same again, but the exhaust waffle insert and blind water crossover and the knock sensor hole ) .at any moment ... it is a relatively simple matter to blind or unblind the water crossover hole and swap the exhaust port inserts and make all three of these housings essentially interchangeable ( as you only need one threaded knock sensor hole ) in all these countries except the US ONLY the n326 housing ( s4 NA ) has that odd leading spark location which is closer to the centreline n326 looks just like n318 ( except spark location , the blind water crossover hole and the waffle type exhaust port insert ) and has the hiroshima patent writing on top.. ( again.. later s4 and new batch units will not have the hiroshima patent font ) but n326 lacks the n318 ( or any ) bossed marking ( ie.. has nothing there at all ) from the pics below...... all of these housings,, with the exception of the far left housing are actually 6p NA housings the far left housing is the n318 housing ,, you can see n318 bossed on one of the pics near the oil injector,, and can see the hiroshima patent font the three housings from the right, are n326 clearly have the higher ( odd ) leading plug location none of them have knock sensor holes,, all are blind in the water crossover ( two have the exhaust port dropped out ( on purpose for worked use ) ,, one ( the gold one ) retains the waffle as original only one ( the gold coloured one ) is old enough to have the hiroshima font the two s5 housings are n350 .. they already have the exhaust ports worked, and swapped for turbo inserts the give away however ( knowing both came from the same engine ) is that we have an F and a R stamp from factory on top.. and both holes for the water crossover are blind ( in a turbo engine,, both housings would have had turbo exhaust inserts and the rear one will have an open water crossover to the inlet manifold ) the far left housing is pure n318 ( marked at oil injector ) and for all respects resembles s5 turbo housings except no knock sensor hole |
Originally Posted by jjwalker
(Post 11799198)
Not sure, but a good question.
I stopped by the shop where my engine was being overhauled and they showed me the new rotor housings they where going to use. I wanted to see what the difference was between the spark plug location for my own curiosity, so I put my old housing right up next to the new one and sure as shit the holes where in the exact same locations. They say "hiroshima blah blah" on the top whereas my old ones don't say anything. turbo inserts .. hiroshima font . lack of knock sensor holes , lower leading plug location what is to bet you can read n318 next to the oil injector?? |
Originally Posted by bumpstart
(Post 11799559)
turbo inserts .. hiroshima font . lack of knock sensor holes , lower leading plug location
what is to bet you can read n318 next to the oil injector?? |
Originally Posted by bumpstart
(Post 11799550)
kinda surprised you lot havent twigged, and made a run on the avail mistral thick 20b centreplates and cranks
|
Originally Posted by bumpstart
(Post 11796991)
s4 rotors have all the fixing pins, but is still cast surface in the bath
s4 turbo ones often have a visible "I" strike dimple in the bath ( clean off the carbon ) and the bath is fractionally wider than the NA one ie. measure the straight section at the top of the bathtub, not including the curved shoulders the turbo rotors are about 30 mm along the top ( or inside well ) of the bath and the NA one is about 25 mm most all rotors have an "I", that doesn't mean they are turbo. turbo rotors have a "T" and an "I" or "II" for engine placement. 20B engines usually are built with all rear "II" rotors. |
Originally Posted by j9fd3s
(Post 10988419)
pic of starter flange. engine is an FD, but the S5 is the same, it has one bolt hole on that flange, which is for a top mount starter. the S4 and earlier engines have a second threaded hole on the other side...
is it s4? S5? https://cimg0.ibsrv.net/gimg/www.rx7...71976a9f6.jpeg https://cimg9.ibsrv.net/gimg/www.rx7...da4a60800.jpeg |
casting letter will tell you. temp sensor thread too.
N370-10-C50 is for cars before 10/89 N370-10-C50A is 10/89+ presumably the difference is the thicker casting all that Mazda sells is the A with the big casting |
Originally Posted by j9fd3s
(Post 12314611)
casting letter will tell you. temp sensor thread too.
N370-10-C50 is for cars before 10/89 N370-10-C50A is 10/89+ presumably the difference is the thicker casting all that Mazda sells is the A with the big casting https://cimg4.ibsrv.net/gimg/www.rx7...fe42202fbd.jpg https://cimg0.ibsrv.net/gimg/www.rx7...7aa4f47b9b.jpg I dont think this "I" means anything https://cimg1.ibsrv.net/gimg/www.rx7...40a17b5b70.jpg "B" ? |
Originally Posted by j9fd3s
(Post 10988419)
pic of starter flange. engine is an FD, but the S5 is the same, it has one bolt hole on that flange, which is for a top mount starter. the S4 and earlier engines have a second threaded hole on the other side...
Everything else points to be s5 except for the rear iron because of the non existing reinforcent bridge thing. Did I end up with defect? Did all s5 engines have that reinforcent bridge then later added a thicker casting to that bridge? Or is this a weird s4 plate with one clutch inspection plate for whatever reason? An early s5? Meaning 10/88 perhaps ... ?? |
Originally Posted by 2-N-D-pink
(Post 12314644)
Ya man this is what I'm talking about. I only have the one bolt hole on the top of the iron. Only reason why I question this iron is because I don't have that extra "bridge" for reinforcement or a thicker casting like the one that is currently in my car.
Everything else points to be s5 except for the rear iron because of the non existing reinforcent bridge thing. Did I end up with defect? Did all s5 engines have that reinforcent bridge then later added a thicker casting to that bridge? Or is this a weird s4 plate with one clutch inspection plate for whatever reason? An early s5? Meaning 10/88 perhaps ... ?? |
Originally Posted by j9fd3s
(Post 12314753)
the D casting letter is an S5, there are TWO S5 irons, the early one, with no reinforcement and the later one with the reinforcement. you have the early one.
|
All times are GMT -5. The time now is 02:51 AM. |
© 2024 MH Sub I, LLC dba Internet Brands