ok i was about to order a new alum radiator for my 89 TII when i noticed that a S4 radiator was like 30 to 40 bucks cheaper.. so whats the big deal to make it that much more expensive. casue i know that i have an 88 SE radiator in there right now. is it a big enough ussue where i need to get the S5 radiator or can i save the 30 - 40 bucks and get the S4.. any input is greatly appreciated.. thankd
Rob

 

Only difference I've heard of is the filler neck - Though I don't even know the exact difference.

 

y don't you call up the place and ask what is the difference? they might even share the same part #. i don't think there will be much difference since they are both TII motors.

 

well they have the part numbers listed and they are different. i was just looking for imput from people who have purchased thiers and what might be different

 

I think the lines are in different places, specific to water pump?

 

ok i was on the mazda trix web site and they also show two different part numbers but no pictures. but what i found wierd is that they had an extra heavy duty 2 pass radiator on there and it was for 86 to 89 but some modifications may be required.. so any ideas out there or what?

 

I have the s5 standard koyo, the filler neck if different. I wish I had bought th s4 or the 2 pass.

 

i know i hate the filler on the s5... so than i should get the s4 one??? it will fit and cool just as good?

 

the only advantage of the s5 is that it maybe* just maybee seperates air a little better because of the slightly higher fill/expansion outlet point.

 

but isnt there still a bleed hole on the side of the top radiator hose on the radiator bend?

 

S4 Koyo rad does have a rad cap, just not on the large extension, its mounted in the center of the top end tank. And the extension is not on this rad.

S5 Koyo rad has the large extension with a rad cap on it.


thats the difference



The dual pass rads say some moification required becasue the inlets/outlets are positioned differently - either one would require modding to fit in either series.

 

not sure about the S5 koyo, but the S4 does have a nipple on the bung where the rad cap mounts.

 

well i got an 88 na radiator in there right now so im assuming ill be ok by ordering the koyo for the s4 than?

 

yep

 

swee thanks for the help you just saved me like 40 bucks!!