Are all S4 N/A's 6 port? If so, can they be streetported?

I was really getting pumped about streetporting my engine, but then i read on rotary engine illustrated.com that porting a 6-port will not see big hp gains.

Any thoughts/advice?

 

Do what you want, dont worry what others say-they respond very well to turbos.I originally wanted a bridgeported 6port, but let the shop talk me out of it and ended up spending alot more than I wanted(engine management,wideband,big fuel,blah,blah)so I would'nt lean out.If you just port it, you can wrap the hell out of it without the added complications of a turbo setup.Its about having fun with it

 

Yes.

Yes.

I don't know where this myth comes from. Standard porting gains are on the order of 20%, usually more...

 

My NA saw very noticable gains with porting. It is an s4 and pulls hard up to 7500 rpm, and has good all around power.

 

I guess it depends on what it means by "big". If you're going by percentage, yes, ports add a nice hunk. But, if you're going by numbers, that's another story.

 

No i understand that to see full gains i'll have to upgrade things like fuel pump, injectors, etc., but will i see gains if i just port it (for now)?

 

You will see gains like aaron said, don't let anybody talk you out of somthing you want. A ported NA will be care free and a blast to drive. Turbos are fun but there is a lot more involved with them.

I say go for it

Jim

 

http://www.mazdatrix.com/faq/porting.htm

 

Porting a 6port in 95 percent of aplications is a wasted effort.

Other simple way of looking at it is. The 140hp now is slow and if you added maybe 15 more up top while destroying other aspect's of the motor, it's still slow.

 

I will say this, Im looking to hopefuly see a Reliable 200hp N/A 6port with as little porting as possiable. It's a work in process, but were not using standard porting techniques ether... were doing it to see if it can be done

as for the 6port, a friend(who also happend to be Purto Rican ) said that you cant port too big with the 6ports without going into the water jackets. However, the 4ports could be ported as big as needed... thought much less reliable and I assume less daily driveable, but he was doing 10s in a older corolla with a 12A and NOS. I say if you wanted to do NA, find a turbo block and use NA rotors. Though im not sure of exact numbers though.

Other than that get a turbo 4port or go 6port Turbo like aaroncake

 

explain to me how 160-200 hp is slow in a 2500lb car?

 

Where did you get 2200lbs from? Im pretty sure a street fc is more than that.
ahh you edited it! sneaky bastard haha

Anyways... I was going to try to push 200hp out of my n/a, but I came to my sences and thought about how much money I would be throwing at it, only to barely beat stock TII's.

You should focus more on other areas before you worry about porting, like exhaust, intake and tuning.

 

if you could only afford one or the other,

would you rebuild your n/a, with a port job, maybe beef up the inernals or something

or would you turbo it?

 

MrFC3S - portorican or not dosent meany he knows jack ****.

liv - umm 14s are ******* slow no matter how you slice it.

 

true, he may not know what hes talking about, but I do know those people are crazy, pushing buttloads of hp out of a 12A somthing... its somthing in the water

well, ill stick with this then. Unless you are PurtoRican, Have buttloads of money, or your name is jesus padalla(I forget the name, has a <10 NA RX7) NA RX7s are not the best choice for "street" driving or Drag racing... Turbos and all will always be better, faster, and cheaper than an NA. But it doesnt mean you cant have fun with the NA

NAs IMO are great and even better than turbos, but dont expect to see sick HP numbers
(unless you are periphal porting $$$)

 

yea I'm still off 200 pounds though

I've almost got my base down to 2200 so I tend to forget

14's arn't that slow

your guys make me sad =\

 

OK, here's the thing...

If you are pulling apart a perfectly good engine to do the porting, then I agree that it's pointless. However, if this is a tired engine or one that you are rebuilding anyway, why not take the 4-6 hours it will take to port the engine? If you don't have to pass emissions then you have nothing to lose but time as the porting is basically free when you do it yourself.

Anyone who makes a blanket statement and says that there is no point porting an NA has no idea what he/she is talking about. There have been threads on this in the past.

Not sure what he means. The intermediate casting on the 4 port is the same as the 6 port, with just a different face. The 6 port end plates already have a lot of port area and you can do some significant work on them without fearing the water jacket. But keep in mind that bigger is not really better.