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 :)
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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...
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its best known as the clutch inspection plate cover,, no SD engine has a top mount starter OEM
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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
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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?
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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 ?
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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)
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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.
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Thank you everyone
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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 ????
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no..NA plate is 6 port
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