S4 front iron in an S5 engine?
09-08-11, 01:08 PM
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S4 front iron in an S5 engine?
Hey guys, I'm rebuilding an S5 engine and have found a ton of S4 front irons but not a cheap S5 one yet! I know there is a difference in the port size and the oil o-ring, but I'll be porting the engine so the port size difference doesn't matter to me and I can special order the gasket kit from Atkins. Are there any major differences that would keep me from using a S4 front iron with my S5 engine? I also have a S4 front cover if I have to use one of those. Anyone with experience doing this? I'm weighing the dificulty of modifying the S4 iron vs finding an S5 one. Thanks!
09-08-11, 03:31 PM
#2
NA or turbo?
If NA, an S5 front iron will be missing one of the port-air passages, which will mean passing a smog test will be pretty unlikely. I don't know if this applies in your area. Pic here of the manifold side: http://homepage.mac.com/carldavis/intake/mod.html
If turbo, I don't think that passage is on the front iron for S4 or S5. The 4-port manifold pictured here has an EGR flange, which makes it S4 : http://www.aaroncake.net/rx-7/4PortLIMTo6Port.htm
If NA, an S5 front iron will be missing one of the port-air passages, which will mean passing a smog test will be pretty unlikely. I don't know if this applies in your area. Pic here of the manifold side: http://homepage.mac.com/carldavis/intake/mod.html
If turbo, I don't think that passage is on the front iron for S4 or S5. The 4-port manifold pictured here has an EGR flange, which makes it S4 : http://www.aaroncake.net/rx-7/4PortLIMTo6Port.htm
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