ive been searching for a answer but cant find a final choice of what is better on a N/A carbed motor?so can i get some help here

 

this is a double edged sword

6 port will give you better get up and go on a stock motor/setup

4 port will be a lot better when doing modifications, you wont have to muck with the 6 ports and such, also turbos are generally easier to do on a 4 port.

 

im thinking at least large streetport possibly full bridgeport this car would be my toy to play not a daily driver

 

Then you'd want to go with a 4-port, are there even any bridgeported 6-ports around? Never seen one.

 

4 port then

6 port can be ported , but I dont think a BP

 

are there issues with using a 89-91 turbo motor compared to a 87-88 turbo motor(would swap in high compresion rotors). i know that i would need a SE front plate and SE oil pan. is there any differnce in the installation of the two series?

 

Check out this link, explains all the differences between the zenki and kouki 13B's:

http://www.hitman.hm/13BHints.htm

 

I know the differnce between the motors i was talking about is there any problems that would make the series 5 motor more difficult to install than the series 4 motor

 

.

 

i dont see why there would be any more complication ?

 

turbo s4 engines have 8.5 and s5 has 9.0.

s5 N/A has 9.4 or 9.5 but I know thats the highest you can get. you will need the appropriate counter weight and flywheel.

The port timing is different on a turbo engine but this can be fixed with porting.

 

sweet thanks guys for all of your help

 

its all about the 6 port

 

S5 NA=9.7:1

 

If you look back at Grassroots racing from a couple years ago they built the Ro-spit, which has a half-bridge ported six-port engine that had been by Tri-Point Engineering.

Just a thought.

 

If you look back at Grassroots racing from a couple years ago they built the Ro-spit, which has a half-bridge ported six-port engine that had been by Tri-Point Engineering. In this setup only the six-port plates are cut with bridges. The center housing is given a mild street port since there is limited steel there to be cut.

Just a thought.

 

Sorry about the double, now triple post...

 

damn you, now i have to go dig that mag up....lol

 

Its the March/April 1999 GRMS - page 92