Hey all, I am planning my future motor for my N/A and have a couple of ?'s for everyone. FIrst off I just watched the 13B rebuild video and was interested in the killer 6 port part combo. Saying to Use S5 rotors with a T2 intermediate housing, and T2 rotor housings. This would still be a 6 port right? Would just using a T2 motor with S5 rotors be better? This motor will progably have to go through smog so could everyone tell me what to do to still be able to do that and still have it making good power.

Sorry if this is been talked about before but I was getting "unkown modifier" errors and all the messages were empty in my searches.

 

Man i hate that damn message. Well, you would probably have to modify an N/A intake manifold in order for it to mate up with the TII housings, but thats not too hard, just bore it out and then make an adaptor plate for it. That motor will flow to hell and back, go ahead and slap a mean *** street port on it while you have it apart. About emissions, if you have to pass a visual you are probably fucked, unless you use the N/A intake and just fool them into thinking its the N/A block.

Good luck man.

 

No visual inspection just emissions. But still with that combo would the motor be a 6 port or 4 port?

 

It would still be a six port because the extra ports are in the front and rear housings, not the middle one.

 

If you were using a T-II block with n/a rotors it would be a 4 port since you only have 4 intake ports. If you use the n/a outer housings (front and rear) it would be a 6 port regardless of what other parts you use with it. It is very easy to adapt an n/a manifold to a turbo block. The 4 port will yield the most power so I say go for it.

 

This is a very long and in depth question. You have to ask your self 3 things then it would be easier to chose your path. #1 what would you want your max HP to be (be reasonable don’t say 1 million). #2 How much are you willing to spend. #3 What is the purpose of the car (street, full track [drag or road/auto-x], slight track and street…) Once these questions are answered I could help you to a path that will work best for you and your application.

 

The TII intermediate irons have larger ports and more area to do porting, so they are wise choice when building any NA engine.

The TII housings don't have the exaust diffuser, and are therefore better flow right out of the box, and easier to port.

I say go for it if you don't have to pass emissions and you want power.

 

Well for my Max HP I would like to see around 200 rwhp, I don't want to put a fortune into this motor, but I woudl like about $3000, but that is probably less then what it will cost. Adn the purpose would be to drive it around a lot (kind of a daily driver) and also take it to open track days at Portland International Raceway. The only scary part is that it will have to go torugh DEQ (smog test), hopefully I would only do this once and then have it registerd in a far out land that doesn't require DEQ testing.

 

Hey all how much HP woudl the S5 rotors give me over the S4 ones? Cuz do to budget concearns I would just like to get a J-spec motor and rebuild that with my current S4 rotors. Or should I spend the money and get new housings?
Thanks
-Justin

 

The S5 rotors higher compression will give you about 10hp, but will not be as friendly to power modifiers in the future. (juice or boost) You can get that 10hp with timing advance, leave the lower compression alone, and someday run massive shots of nitrous on the same motor.

Make sure you get the S5 TII intermediate housing. The S4 isn't any better than a ported n/a.

Also be careful with the timing of the exhaust porting. Advancing it will decrease torque and lessen the drivability of the motor. Most porting templates which suggest porting "down" on the exhaust are intended for turbo's which make up for the loss with higher boost and a faster spool. Concentrate on smoothness in the runners. Abrupt changes in direction hurt flow.

 

Hey Jimmy, does it matter which rotor rotor housings I use S4 TII vs. S5 TII?

 

The TII rotor housings have a water passage that needs to be plugged above the exhaust ports. (goes into the intake manifold on the turbo motor) Other than that, I don't think there is any difference between the two to my knowledge. (besides their obviously lacking diffusers)

 

Great, it seems to be a lot easier to find S4 TII housings than it is to find S5.

 

S5 housings have better coatings and the leading plug hole is a little higher, which slightly alters timing.

 

Thanks for the correction.